RP504x SERIES 600mA Step-down DC/DC Converter with Synchronous Rectifier NO.EA-259-130520 OUTLINE The RP504x Series are low supply current CMOS-based 600mA step-down DC/DC Converters with synchronous rectifier. Each of these ICs consists of an oscillator, a reference voltage unit, an error amplifier, a switching control circuit, a mode control circuit(Ver.A, D), a soft-start circuit, a "latch type" protection circuit, an under voltage lockout (UVLO) circuit, and switching transistors. A low ripple, high efficiency synchronous rectifier step-down DC/DC converter can be easily composed of this IC with only an inductor and capacitors. Since packages are SOT-23-5, DFN1616-6B, DFN(PLP)1216-6F, high density mounting on boards is possible. As protection circuits, the RP504x Series contain a current limit circuit which limits the Lx peak current in each clock cycle, and a latch type protection circuit which latches the built-in driver to the OFF state if the load current exceeds the limit value or the output short continues for a specified time (the protection delay time). The latch protective circuit can be released by once putting the IC into the standby mode with the CE pin and then into the active mode, or, by turning the power off and back on. Setting the supply voltage lower than the UVLO detector threshold can also release the latch protective circuit. In terms of the output voltage, since the feedback resistances are built-in, the voltage is fixed internally. 0.1V step output can be set by laser-trim and 1.5% or 18mV tolerance depending on the output voltage is guaranteed. By inputting a signal to a MODE pin, the RP504x Series can be switched between PWM/VFM auto switching control and Forced PWM control. PWM/VFM auto switching control switches to high-efficiency VFM mode in low output current. Forced PWM control switches to fixed-frequency Forced PWM mode for reducing noise in low output current. )This is an approximate value, because output current depends on conditions and external parts. FEATURES Supply Current ...................................................... Typ. 25A(at VFM mode, at no load) Standby Current .................................................... Max. 5A Input Voltage Range ............................................. 2.3V to 5.5V (VOUT1.0V) Output Voltage Range........................................... 0.8V to 3.3V (With a 0.1V step) Output Voltage Accuracy....................................... 1.5% (VOUT1.2V), 18mV (VOUT<1.2V) Temperature-Drift Coefficient of Output Voltage ... Typ. 40ppm/C Oscillator Frequency ............................................. Typ. 2.25MHz Oscillator Maximum Duty Cycle ............................ Min. 100% Built-in Driver ON Resistance ............................... Typ. Pch. 0.34Nch. 0.43(VIN=3.6V) UVLO Detector Threshold..................................... Typ. 2.0V Soft Start Time....................................................... Typ. 0.15ms LX Current Limit ..................................................... Typ. 900mA Latch type Protection Circuit ................................. Typ. 1.5ms Auto discharge function ........................................ Only for D Version Two choices of Switching Mode............................ DFN1616-6B and DFN(PLP)1216-6F are available in adjustable switching control options from PWM/VFM auto switching type or Forced PWM type by using MODE pin. SOT-23-5 is available in fixed switching control options: PWM/VFM auto switching type for B version or Forced PWM type for C version. Packages .............................................................. SOT-23-5, DFN1616-6B, DFN(PLP)1216-6F 1 RP504x APPLICATIONS Power source for battery-powered equipment. Power source for hand-held communication equipment, cameras, VCRs, camcorders. Power source for HDD, portable equipment. BLOCK DIAGRAMS RP504xxxxA V IN CE CHIP ENABLE CURRENT FEEDBACK RAMP COMPENSATION OSCILLATOR VREF CURRENT PROTECTION PWM SOFT START Lx SWITCHING CONTROL UVLO V OUT MODE GND RP504xxxxB V IN CE CHIP ENABLE CURRENT FEEDBACK RAMP COMPENSATION OSCILLATOR VREF SOFT START MODE GND 2 PWM CURRENT PROTECTION Lx SWITCHING CONTROL UVLO V OUT RP504x RP504xxxxC V IN CE CHIP ENABLE CURRENT FEEDBACK RAMP COMPENSATION OSCILLATOR VREF CURRENT PROTECTION PWM SOFT START Lx SWITCHING CONTROL UVLO V OUT MODE GND RP504xxxxD V IN CE CHIP ENABLE RAMP COMPENSATION CURRENT FEEDBACK OSCILLATOR VREF SOFT START PWM CURRENT PROTECTION LX SWITCHING CONTROL UVLO V OUT MODE GND 3 RP504x SELECTION GUIDE In the RP504x Series, output voltage, MODE control, auto discharge function, and package for the ICs are selectable at the user's request. Product Name Package Quantity per Reel Pb Free Halogen Free RP504Nxx1$-TR-FE SOT-23-5 3,000 pcs Yes Yes RP504Lxx1$-TR DFN1616-6B 5,000 pcs Yes Yes RP504Kxx1$-E2 DFN(PLP)1216-6F 5,000 pcs Yes Yes 1 xx : The output voltage can be designated in the range from 0.8V(08) to 3.3V(33) in 0.1V steps . Designation is possible in the range from 0.8V to 3.3V with a step of 0.1V (Refer to the marking information) $ : Designation of mask option Symbol Package A DFN1616-6B DFN(PLP)1216-6F B SOT-23-5 C SOT-23-5 D DFN1616-6B DFN(PLP)1216-6F Mode Control Yes ("H" forced PWM, "L" PWM/VFM automatic shift) No (PWM/VFM automatic shift) Auto discharge function No No No (forced PWM) Yes ("H" forced PWM, "L" PWM/VFM automatic shift) No Yes Auto-discharge function quickly lowers the output voltage to 0V, when the chip enable signal is switched from the active mode to the standby mode, by releasing the electrical charge accumulated in the external capacitor. 1) 0.05V step is also available as a custom code. PIN CONFIGURATIONS SOT-23-5 Top View 5 DFN1616-6B Top View 4 6 5 4 DFN(PLP)1216-6F Bottom View 4 5 Top View Bottom View 6 6 5 4 4 5 6 1 2 3 3 2 1 (mark side) 1 1 4 2 3 2 3 3 2 1 RP504x PIN DESCRIPTIONS RP504Nxx1B, RP504Nxx1C : SOT-23-5 Pin No. Symbol Description 1 VOUT Output Pin 2 GND Ground Pin 3 LX LX Switching Pin 4 VIN Input Pin 5 CE Chip Enable Pin ("H" Active) RP504Lxx1A, RP504Lxx1D : DFN1616-6B Pin No. Symbol Description 1 CE 2 MODE 3 VIN Input Pin 4 LX LX Switching Pin 5 GND Ground Pin 6 VOUT Output Pin Chip Enable Pin ("H" Active) Mode Control Pin ("H" forced PWM, "L" PWM/VFM automatic shift) ) Tab is GND level. (They are connected to the reverse side of this IC.) The tab is better to be connected to the GND, but leaving it open is also acceptable. RP504Kxx1A, RP504Kxx1D : DFN(PLP)1216-6F Pin No. Symbol Description 1 VIN 2 MODE 3 CE Chip Enable Pin ("H" Active) 4 VOUT Output Pin 5 GND Ground Pin 6 LX Input Pin Mode Control Pin ("H" forced PWM, "L" PWM/VFM automatic shift) LX Switching Pin 5 RP504x ABSOLUTE MAXIMUM RATINGS (GND=0V) Symbol Item Rating Unit -0.3 to 6.5 V -0.3 to VIN + 0.3 V VIN VIN Input Voltage VLX LX Pin Voltage VCE CE Pin Input Voltage -0.3 to 6.5 V VMODE Mode Control Pin Voltage -0.3 to 6.5 V VOUT VOUT Pin Voltage -0.3 to 6.5 V 900 mA ILX LX Pin Output Current 420 Power Dissipation (SOT-23-5) PD 640 Power Dissipation (DFN1616-6B) Power Dissipation (DFN(PLP)1216-6F) Ta Tstg mW 385 Operating Temperature Range -40 to 85 C Storage Temperature Range -55 to 125 C ) For Power Dissipation, please refer to PACKAGE INFORMATION. ABSOLUTE MAXIMUM RATINGS Electronic and mechanical stress momentarily exceeded absolute maximum ratings may cause the permanent damages and may degrade the life time and safety for both device and system using the device in the field. The functional operation at or over these absolute maximum ratings is not assured. RECOMMENDED OPERATING CONDITIONS (ELECTRICAL CHARACTERISTICS) All of electronic equipment should be designed that the mounted semiconductor devices operate within the recommended operating conditions. The semiconductor devices cannot operate normally over the recommended operating conditions, even if when they are used over such conditions by momentary electronic noise or surge. And the semiconductor devices may receive serious damage when they continue to operate over the recommended operating conditions. 6 RP504x ELECTRICAL CHARACTERISTICS (Ta=25C) RP504xxxxA, RP504xxxxD Symbol VIN Item Conditions Operating Input Voltage Max. 2.3 5.5 VOUT <1.0 2.3 4.5 0.985 -0.018 1.015 +0.018 VOUT1.2V VIN=VCE=3.6V or VSET+1V Output Voltage Temperature Coefficient -40C Ta 85C fosc Oscillator Frequency VIN=VCE=3.6V or VSET+1V IDD1 Supply Current 1 VIN=VCE=5.5V, VOUT=VSET0.8 IDD2 Supply Current 2 VIN=VCE=VOUT=5.5V Istandby Standby Current VIN=5.5V,VCE=0V ICEH CE "H" Input Voltage VIN=VCE=5.5V ICEL CE "L" Input Voltage IMODEH IMODEL VOUT/T Typ. VOUT 1.0 Output Voltage VOUT Min. VOUT<1.2V 40 V V ppm/C 2.25 2.55 MHz 400 800 A VMODE=0V 25 40 VMODE=5.5V 400 800 0 5 A -1 0 1 A VIN=5.5V,VCE=0V -1 0 1 A Mode "H" Input Current VIN=VMODE=5.5V -1 0 1 A Mode "L" Input Current VIN=5.5V, VMODE=0V -1 0 1 A VIN=VOUT=5.5V,VCE=0V -1 0 1 A 1 1.95 Unit A IVOUTH VOUT "H" Input Current IVOUTL VOUT "L" Input Current VIN=5.5V,VCE=VOUT=0V -1 0 1 A ILXLEAKH LX Leakage Current "H" VIN=VLX=5.5V,VCE=0V -1 0 5 A ILXLEAKL LX Leakage Current "L" VIN=5.5V,VCE=VLX=0V -5 0 1 A VCEH CE "H" Input Voltage VIN=5.5V 1.0 VCEL CE "L" Input Voltage VIN=2.3V VMODEH Mode "H" Input Voltage VIN=VCE=5.5V VMODEL Mode "L" Input Voltage VIN=VCE=2.3V 2 RLOW Nch On Resistance RONP On Resistance of Pch Tr. RONN On Resistance of Nch Tr. Maxduty V 0.4 1.0 V 0.4 VIN=3.6V,VCE=0V V V 30 VIN=3.6V, ILX=-100mA 0.34 VIN=3.6V, ILX=-100mA 0.43 Oscillator Maximum Duty Cycle 100 % 150 310 s tstart Soft-start Time VIN=VCE=3.6V or VSET+1V ILXlim Lx Current Limit VIN=VCE=3.6V or VSET+1V 700 900 tprot Protection Delay Time VIN=VCE=3.6V or VSET+1V 0.5 1.5 5 ms VUVLO1 UVLO Detector Threshold VIN=VCE 1.9 2.0 2.1 V VUVLO2 UVLO Released Voltage VIN=VCE 2.0 2.1 2.2 V mA Test circuit is "OPEN LOOP" and AGND=PGND=0V unless otherwise specified. 1) without auto discharge version only 2) with auto discharge version only 7 RP504x (Ta=25C) RP504xxxxB, RP504xxxxC Symbol VIN Item Operating Input Voltage Conditions 5.5 VOUT <1.0 2.3 4.5 VOUT 1.2V 0.985 1.015 VOUT < 1.2V -0.018 +0.018 Output Voltage Temperature Coefficient -40C Ta 85C fosc Oscillator Frequency VIN=VCE=3.6V or VSET+1V IDD1 Supply Current 1 VIN=VCE=5.5V, VOUT=VSET0.8 IDD2 Supply Current 2 VIN=VCE=VOUT=5.5V Istandby Standby Current VIN=5.5V,VCE=0V ICEH CE "H" Input Voltage VIN=VCE=5.5V ICEL CE "L" Input Voltage IVOUTH IVOUTL 40 V V ppm/C 2.55 MHz 400 800 A RP504xxxxB 40 60 RP504xxxxC 500 840 0 5 A -1 0 1 A VIN=5.5V,VCE=0V -1 0 1 A VOUT "H" Input Current VIN=VOUT=5.5V,VCE=0V -1 0 1 A VOUT "L" Input Current VIN=5.5V,VCE=VOUT=0V -1 0 1 A ILXLEAKH LX Leakage Current "H" VIN=VLX=5.5V,VCE=0V -1 0 5 A ILXLEAKL LX Leakage Current "L" VIN=5.5V,VCE=VLX=0V -5 0 1 A VCEH CE "H" Input Voltage VIN=5.5V 1.0 VCEL CE "L" Input Voltage VIN=2.3V RONP On Resistance of Pch Tr. VIN=3.6V, ILX=-100mA 0.34 RONN On Resistance of Nch Tr. VIN=3.6V, ILX=-100mA 0.43 Oscillator Maximum Duty Cycle 1.95 Unit 2.25 Maxduty A V 0.4 100 V % 150 310 s tstart Soft-start Time VIN=VCE=3.6V or VSET+1V ILXlim LX Current Limit VIN=VCE=3.6V or VSET+1V 700 900 tprot Protection Delay Time VIN=VCE=3.6V or VSET+1V 0.5 1.5 5 ms VUVLO1 UVLO Detector Threshold VIN=VCE 1.9 2.0 2.1 V VUVLO2 UVLO Released Voltage VIN=VCE 2.0 2.1 2.2 V Test circuit is "OPEN LOOP" and AGND=PGND=0V unless otherwise specified. 8 Max. 2.3 VIN=VCE=3.6V or VSET+1V VOUT/T Typ. VOUT 1.0 Output Voltage VOUT Min. mA RP504x TYPICAL APPLICATION RP504N:SOT-23-5 (MODE Pin is not included.) VOUT CE Control RP504N Series GND Load VIN LX VIN COUT 4.7F L 2.2H CIN 2.2F RP504L:DFN1616-6B / RP504K:DFN(PLP)1216-6F (MODE Pin is included.) VOUT CE Control RP504L,K Series Control MODE GND Load VIN VIN LX L 2.2H CIN 2.2F COUT 4.7F ) MODE="H" forced PWM MODE="L" PWM/VFM automatic shift Symbol Recommendation components C1608JB0J225K (TDK) 2.2F CIN 2.2F2 Ceramic 4.7F COUT 4.7F Ceramic L 2.2H Inductor C1005JB0J225K (TDK) JMK105BJ225MV (Taiyo Yuden) C1005X5R0J475M (TDK) JMK105BJ475MV (Taiyo Yuden) C1608JB0J475K (TDK) GRM188B30J475KE18 (Murata) MIPSZ2520D2R2 (FDK) MIPS2520D2R2 (FDK) MLP2520S2R2M (TDK) VLS252010T-2R2M (TDK) 9 RP504x TECHNICAL NOTES When you use these ICs, consider the following issues: Set external components such as an inductor, CIN, COUT as close as possible to the IC, in particular, minimize the wiring to VIN pin and PGND pin. Reinforce the VIN, PGND, and VOUT lines sufficiently. Large switching current may flow in these lines. If the impedance of VIN and PGND lines is too large, the internal voltage level in this IC may shift caused by the switching current, and the operation might be unstable. The wiring between VOUT and load and between L and VOUT should be separated. The recommended capacitance value for the CIN capacitor connected between the VIN and PGND pins is 2.2F or more. Also, the recommended capacitance value for the COUT capacitor is 4.7F ~ 10F.Please be aware of the characteristics of bias dependence and temperature fluctuation of ceramic capacitor. Choose an inductor with inductance range from 2.2H to 4.7H. The phase compensation has been made by these values with output capacitors. The recommendation characteristics of the inductor are low DC resistance, large enough permissible current, and strong against the magnetic saturation. Inductance value may shift depending on an inductor. If the inductance value at an actual load current is low, LX peak current may increase and may overlap the LX current limit. As a result, over current protection may work. Over current protection circuit, Latch-type protection circuit may be affected by self-heating and heat radiation environment. The performance of power supply circuits using this IC largely depends on the peripheral circuits. Please be very careful when setting the peripheral parts. When designing the peripheral circuits of each part, PCB patterns, and this IC, please do not exceed the rated values (Voltage, Current, Power). 10 RP504x Operation of step-down DC/DC converter and Output Current The DC/DC converter charges energy in the inductor when LX transistor is ON, and discharges the energy from the inductor when LX transistor is OFF and controls with less energy loss, so that a lower output voltage than the input voltage is obtained. The operation will be explained with reference to the following diagrams: <Basic Circuit> <Current through L> IL i1 VIN L Pch Tr Nch Tr VOUT i2 ILmax ILmin i1 topen i2 CL GND ton toff T=1/fosc Step 1 : Pch Tr. turns on and current IL (=i1) flows, and energy is charged into CL. At this moment, IL increases from ILmin (=0) to reach ILmax in proportion to the on-time period (ton) of Pch Tr. Step 2 : When Pch Tr. turns off, Synchronous rectifier Nch Tr. turns on in order that L maintains IL at ILmax, and current IL (=i2) flows. Step 3: IL (=i2) decreases gradually and reaches IL=ILmin=0 after a time period of topen, and Nch Tr. turns off. Provided that in the continuous mode, next cycle starts before IL becomes to 0 because toff time is not enough. In this case, IL value increases from this ILmin (>0). In the case of PWM control system, the output voltage is maintained by controlling the on-time period (ton), with the oscillator frequency (fosc) being maintained constant. The maximum value (ILmax) and the minimum value (ILmin) of the current flowing through the inductor are the same as those when Pch Tr. turns on and off. The difference between ILmax and ILmin, which is represented by I: I = ILmax - ILmin = VOUT topen / L = (VIN - VOUT) ton / L ......................................... Equation 1 wherein, T = 1 / fosc = ton + toff duty (%)= ton / T 100 = ton fosc 100 topen toff In Equation 1, VOUT topen / L and (VIN - VOUT) ton / L respectively show the change of the current at "ON", and the change of the current at "OFF". 11 RP504x Discontinuous mode and Continuous mode When the output current (IOUT) is relatively small, topen < toff as illustrated in the above diagram. In this case, the energy is charged in the inductor during the time period of ton and is discharged in its entirely during the time period of toff, therefore ILmin becomes to zero (ILmin=0). When IOUT is gradually increased, eventually, topen becomes to toff (topen=toff), and when IOUT is further increased, ILmin becomes larger than zero (ILmin>0). The former mode is referred to as the discontinuous mode and the latter mode is referred to as continuous mode. Discontinuous mode Continuous mode ILmax IL IL ILmax ILmin ILmin topen t ton T=1/fosc toff Iconst ton t toff T=1/fosc In the continuous mode, when Equation 1 is solved for ton and assumed that the solution is tonc, tonc = T VOUT / VIN .......................................................................................................Equation 2 When ton<tonc, the mode is the discontinuous mode, and when ton=tonc, the mode is the continuous mode. 12 RP504x Output Current and selection of External components The relation between the output current and external components is as follows: (Wherein, Ripple Current p-p value is described as IRP, ON resistance of Pch Tr. and Nch Tr. of LX are respectively described as RONP and RONN, and the DC resistor of the inductor is described as RL.) When Pch Tr. of LX is ON: VIN = VOUT + (RONP + RL) IOUT + L IRP / ton ................................................................. Equation 3 When Pch Tr. of LX is "OFF" (Nch Tr. is "ON"): L IRP / toff = RONN IOUT + VOUT + RL IOUT ................................................................. Equation 4 Put Equation 4 to Equation 3 and solve for ON duty of Pch transistor, DON = ton / (toff + ton), DON = (VOUT + RONN IOUT + RL IOUT) / (VIN + RONN IOUT - RONP IOUT)....................... Equation 5 Ripple Current is as follows: IRP = (VIN - VOUT - RONP IOUT - RL IOUT) DON / fosc / L............................................. Equation 6 wherein, peak current that flows through L, and LX Tr. is as follows: ILXmax = IOUT + IRP / 2 .................................................................................................... Equation 7 Consider ILXmax, condition of input and output and select external components. The above explanation is directed to the calculation in an ideal case in continuous mode. 13 RP504x TIMING CHART (1) Soft Start Time In the case of starting this IC with CE In the case of starting this IC with CE, the operation can be as in the timing chart below. When the voltage of CE pin (VCE) is beyond the threshold level, the operation of the IC starts. The threshold voltage of CE pin is in between CE "H" input voltage (VCEH) and CE "L" input voltage (VCEL) described in the electrical characteristics table. Soft-start circuit operates, and after the certain time, the reference voltage inside the IC (VREF) is rising gradually up to the constant value. CE Pin Input Voltage (VCE) IC Internal Voltage Reference (VREF) Lx Voltage (VLX) VCEH Threshold Level VCEL Soft-start Time Soft-start Circuit operating PWM mode operating during the Soft-start Time Output Voltage (VOUT) Depending on Power supply, Load Current, External Components Soft-start time is the time interval from soft start circuit starting point to the reference voltage level reaching point up to this constant level. Soft start time is not always equal to the turn-on speed of DC/DC converter. The power supply capacity for this IC, load current, inductance and capacitance values affect the turn-on speed. In the case of starting with power supply In the case of starting with power supply, when the input voltage (VIN) is larger than UVLO released voltage (VUVLO2), soft start circuit operates, and after that, the same explanation above is applied to the operation. Soft-start time is the time interval from soft start circuit starting point to the reference voltage level reaching point up to this constant level. Input Voltage (VIN) Set VOUT VUVLO2 VUVLO1 Soft-start Time IC Internal Voltage Reference (VREF) Lx Voltage (VLX) PWM mode operating during the Soft-start Time Set VOUT Output Voltage (VOUT) Depending on Power supply, Load Current, External Components Turn-on speed is affected by next conditions; (a) Input Voltage (VIN) rising speed depending on the power supplier to the IC and input capacitor CIN. (b) Output Capacitor COUT value and load current value. 14 RP504x (2) Under Voltage Lockout (UVLO) Circuit The step-down DC/DC converter stops and ON duty becomes 100%, if input voltage (VIN) becomes less than the set output voltage (Set VOUT), the output voltage (VOUT) gradually drops according to the input voltage (VIN). If the input voltage drops more and becomes less than UVLO detector threshold (VUVLO1), the under voltage lockout circuit (UVLO) operates, the IC internal reference voltage (VREF) stops, switching transistors turn off and the output voltage drops according to the load and output capacitor COUT value. To restart the normal operation, the input voltage (VIN) must be more than the UVLO released voltage (VUVLO2). The timing chart below describes the operation with varying the input voltage (VIN). Input Voltage (VIN) Set VOUT VUVLO2 VUVLO1 IC Internal Voltage Reference (VREF) Soft-start Time Lx Voltage (VLX) Output Voltage Set VOUT (VOUT) Depending on Power supply, Load Current, External Components Actually, the waveform of VOUT at UVLO working and releasing varies depending on the initial voltage of COUT and load current situation. 15 RP504x (3) Over Current Protection Circuit, Latch Type Protection Circuit Over current protection circuit supervises the inductor peak current (the current flowing through Pch transistor) in each switching cycle, and if the current exceeds the LX current limit (ILXlim), turns off Pch transistor. The LX current limit of RP504x is Typ.900mA. Latch type protection circuit latches the built-in driver to the OFF state and stops the operation of DC/DC converter if the over current status continues or the output voltage continues being the half of the setting voltage for equal or longer than protection delay time (tprot). LX current limit (ILXlim) and protection delay time (tprot) could be easily affected by self-heating or ambient environment. If the input voltage (VIN) drops drastically or becomes unstable due to short-circuit, the protection operation and protection delay time may be affected. Protection Delay Time (tprot) Lx Current Lx Current Limit (ILXlim) Pch Tr. Current Lx Voltage (VLX) To release the condition of latch type protection, restart this IC by inputting "L" signal to CE pin, or restart this IC with power-on or make the supply voltage lower than UVLO detector threshold (VUVLO1) level. The timing chart shown below describes the changing process of input voltage rising, stable operating, operating with large current, reset with CE pin, stable operating, input voltage falling, input voltage recovering, and stable operating. Point(1) : If the large current flows through the circuit or the IC goes into low output voltage condition due to short-circuit or other reasons, the latch type protection circuit latches the built-in driver to OFF state after the protection delay time (tprot). Then, VLX becomes "L" and the output voltage turns OFF. In this timing chart below, the latch protective circuit can be released by once putting the IC into "L" with the CE pin and then into "H" again. Point(2) : The latch type protection can be released by UVLO reset by making the input voltage lower than the UVLO detector threshold(VUVLO1). (1) (2) Set VOUT Input Voltage UVLO Release Voltage (VUVLO2) (VIN) UVLO Detect Voltage (VUVLO1) CE Pin Input Voltage (V CE) Lx Voltage (V LX ) Output Voltage (V OUT) UV LO Reset Set VOUT Threshold Level CE Reset Protection Delay Time Protection Delay Time Set VOUT Set VOUT Latch-type Protection Stable operation Soft-start Time 16 Stable operation Soft-start Time Latch-type Protecti on Stable operation Soft-start Time RP504x TYPICAL CHARACTERISTICS 1) Output Voltage vs. Output Current RP504x VOUT=0.8V RP504x MODE="L"PWM/VFM automatic shift MODE="H" forced PWM 0.820 0.815 VIN=3.6V 0.810 VIN=4.5V 0.805 0.800 0.795 0.790 0.785 Output Voltage V OUT (V) Output Voltage V OUT (V) 0.820 0.780 0.01 0.815 VIN=3.6V 0.810 VIN=4.5V 0.805 0.800 0.795 0.790 0.785 0.780 0.1 1 10 100 0 100 Output Current IOUT (m A) RP504x VOUT=1.2V 1.210 VIN=5.0V 1.205 1.200 1.195 1.190 1.185 Output Voltage V OUT (V) Output Voltage V OUT (V) 1.215 1.180 1.215 VIN=3.6V 1.210 VIN=5.0V 1.205 1.200 1.195 1.190 1.185 1.180 0.1 10 Output Current IOUT (m A) RP504x 1 100 0 VOUT=1.8V 100 200 300 400 500 Output Current IOUT (m A) RP504x MODE="L"PWM/VFM automatic shift 600 VOUT=1.8V MODE="H" forced PWM 1.830 VIN=3.6V VIN=5.0V 1.810 1.800 1.790 Output Voltage V OUT (V) 1.830 Output Voltage V OUT (V) VOUT=1.2V 1.220 VIN=3.6V VIN=3.6V 1.820 VIN=5.0V 1.810 1.800 1.790 1.780 1.780 0.01 600 MODE="H" forced PWM 1.220 1.820 200 300 400 500 Output Current IOUT (m A) RP504x MODE="L"PWM/VFM automatic shift 0.01 VOUT=0.8V 0.1 1 10 Output Current IOUT (m A) 100 0 100 200 300 400 500 600 Output Current IOUT (m A) 17 RP504x RP504x VOUT=3.3V MODE="L"PWM/VFM automatic shift RP504x VOUT=3.3V MODE="H" forced PWM 3.320 VIN=4.3V 3.310 VIN=5.0V 3.300 3.290 3.280 VIN=4.3V Output Voltage V OUT (V) Output Voltage V OUT (V) 3.320 3.310 VIN=5.0V 3.300 3.290 3.280 3.270 3.270 0.01 0.1 1 10 Output Current IOUT (m A) 0 100 100 200 300 400 500 600 Output Current IOUT (m A) 2) Output Voltage vs. Input Voltage RP504x VOUT=1.2V MODE="H" forced PWM 0.820 1.220 0.815 1.215 Output Voltage V OUT (V) Output Voltage V OUT (V) RP504x VOUT=0.8V MODE="H" forced PWM 0.810 0.805 0.800 IOUT=1m A 0.795 IOUT=50m A 0.790 IOUT=250m A 0.785 0.780 1.210 1.205 1.200 1.195 IOUT=1m A 1.190 IOUT=50m A 1.185 IOUT=250m A 1.180 2 2.5 3 3.5 4 Input Voltage VIN (V) 4.5 2 Output Voltage V OUT (V) Output Voltage V OUT (V) 1.82 1.81 1.8 IOUT=1m A IOUT=50m A IOUT=250m A 1.77 2 2.5 3 3.5 4 4.5 Input Voltage VIN (V) 18 3.5 4 4.5 5 5.5 RP504x VOUT=3.3V MODE="H" forced PWM 1.83 1.78 3 Input Voltage VIN (V) RP504x VOUT=1.8V MODE="H" forced PWM 1.79 2.5 5 5.5 3.35 3.34 3.33 3.32 3.31 3.3 3.29 3.28 3.27 3.26 3.25 IOUT=1m A IOUT=50m A IOUT=250m A 3.5 4 4.5 Input Voltage VIN (V) 5 5.5 RP504x 3) Output Voltage vs. Temperature Output Voltage V OUT (V) 1.830 1.820 VIN=3.6V 1.810 1.800 1.790 1.780 1.770 -50 -25 0 25 50 75 Tem perature Ta(C) 100 4) Efficiency vs. Output Current RP504x VOUT=0.8V 100 Efficiency (%) 80 100 VIN=4.5V, VMODE=0V 90 VIN=3.6V, VMODE=0V 70 60 50 VIN=VMODE=4.5V 40 30 VIN=VMODE=3.6V 20 VIN=3.6V, VMODE=0V 70 60 50 40 VIN=VMODE=5.0V 30 VIN=VMODE=3.6V 10 0.1 1 10 100 Output Current IOUT (mA) 0 0.01 1000 VOUT=1.8V VIN=5.0V, VMODE=0V 100 VIN=3.6V, VMODE=0V 90 80 70 60 50 40 VIN=VMODE=5.0V 30 20 VIN=VMODE=3.6V 10 0 0.01 0.1 1 10 100 1000 Output Current IOUT (mA) 0.1 1 10 100 Output Current IOUT (mA) RP504x Efficiency (%) RP504x Efficiency (%) VIN=5.0V, VMODE=0V 20 10 0 0.01 VOUT=1.2V 80 Efficiency (%) 90 RP504x 1000 VOUT=3.3V VIN=5.0V, VMODE=0V 100 VIN=4.3V, VMODE=0V 90 80 70 60 50 VIN=VMODE=4.3V 40 30 20 VIN=VMODE=3.6V 10 0 0.01 0.1 1 10 100 1000 Output Current IOUT (mA) 19 RP504x 5) Supply Current vs. Temperature 6) Supply Current vs. Input Voltage RP504x VOUT=1.8V(VIN=5.5V) MODE="L"PWM/VFM automatic shift RP504x VOUT=1.8V MODE="L"PWM/VFM automatic shift 40 35 Clos ed Loop 30 Open Loop Supply Current (A) Supply Current (A) 40 25 20 15 35 Clos ed Loop 30 Open Loop 25 20 15 10 10 -50 -25 0 25 50 75 100 2 2.5 3 3.5 4 4.5 Input Voltage VIN (V) Tem perature Ta(C) 5 5.5 7) Output Ripple Voltage Vripple RP504x VOUT=0.8V(VIN=3.6V) MODE="L"PWM/VFM automatic shift RP504x VOUT=0.8V(VIN=3.6V) MODE="H" forced PWM 300 200 100 0 -100 5 10 Time t (s) 15 20 Output Voltage IL 100 50 0 -50 -100 0 RP504x VOUT=1.2V(VIN=3.6V) MODE="L"PWM/VFM automatic shift 20 5 10 Time t (s) 15 20 3 4 5 6 7 Time t (s) 8 9 10 IOUT=10mA 0.04 0.03 0.02 0.01 0.00 -0.01 Output Ripple Voltage (AC) Vripple (V) 300 200 100 0 -100 Inductor Current IL (mA) Output Ripple Voltage (AC) Vripple (V) Output Voltage IL 0 2 RP504x VOUT=1.2V(VIN=3.6V) MODE="H" forced PWM IOUT=10mA 0.04 0.03 0.02 0.01 0.00 -0.01 1 Output Voltage Inductor Current IL (mA) 0 IOUT=10mA 0.04 0.03 0.02 0.01 0.00 -0.01 Inductor Current IL (mA) IL Output Ripple Voltage (AC) Vripple (V) Output Voltage Inductor Current IL (mA) Output Ripple Voltage (AC) Vripple (V) IOUT=10mA 0.04 0.03 0.02 0.01 0.00 -0.01 IL 100 50 0 -50 -100 0 1 2 3 4 5 6 7 Time t (s) 8 9 10 RP504x VOUT=1.8V(VIN=3.6V) RP504x MODE="L"PWM/VFM automatic shift MODE="H" forced PWM 300 200 100 0 -100 0 5 RP504x 10 Time t (s) 15 IOUT=10mA 0.04 0.03 0.02 0.01 0.00 -0.01 Output Voltage IL 100 50 0 -50 -100 0 20 1 VOUT=3.3V(VIN=5.0V) 2 4 5 6 7 Time t (s) RP504x MODE="L"PWM/VFM automatic shift 8 MODE="H" forced PWM 0 5 10 Time t (s) 15 IOUT=10mA Output Ripple Voltage (AC) Vripple (V) 300 200 100 0 -100 Inductor Current IL (mA) Output Ripple Voltage (AC) Vripple (V) Output Voltage IL 0.04 0.03 0.02 0.01 0.00 -0.01 Output Voltage IL 200 150 100 50 0 -50 -100 0 20 8) Frequency vs. Temperature 1 2 3 4 5 6 7 Time t (s) 8 9 10 9) Frequency vs. Input Voltage 2.5 Frequency fosc (MHz) 2.5 VIN=3.6V 2.4 9 10 VOUT=3.3V(VIN=5.0V) IOUT=10mA 0.04 0.03 0.02 0.01 0.00 -0.01 Frequency fosc (MHz) 3 Inductor Current IL (mA) IL Output Ripple Voltage (AC) Vripple (V) Output Ripple Voltage (AC) Vripple (V) Output Voltage Inductor Current IL (mA) IOUT=10mA 0.04 0.03 0.02 0.01 0.00 -0.01 VOUT=1.8V(VIN=3.6V) Inductor Current IL (mA) RP504x 2.3 2.2 2.1 2 -40C 2.4 25C 85C 2.3 2.2 2.1 2 -50 -25 0 25 50 Tem perature Ta (C) 75 100 2 2.5 3 3.5 4 4.5 Input Voltage VIN (V) 5 5.5 21 RP504x 10) Soft Start Time vs. Temperature Soft Start Time tstart (s) 220 210 200 190 180 170 -50 -25 0 25 50 75 Tem perature Ta(C) 100 11) UVLO Detector Threshold / Released Voltage vs. Temperature UVLO Detector Threshold Voltage UVLO Released Voltage 2.3 UVLO Voltage V UVLO2 (V) UVLO Voltage V UVLO1 (V) 2.3 2.2 2.1 2.0 1.9 2.2 2.1 2.0 1.9 -50 -25 0 25 50 Tem perature Ta(C) 75 100 -50 -25 0 25 50 75 Tem perature Ta(C) 100 12) CE Input Voltage vs. Temperature CE"H" Input Voltage(VIN=5.5V) CE"H" Input Voltage (VIN=2.3V) (V) 1 0.9 CE 0.8 CE Input Voltage V CE Input Voltage V CE (V) 1 0.7 0.6 0.5 0.4 0.8 0.7 0.6 0.5 0.4 -50 22 0.9 -25 0 25 50 Tem perature Ta(C) 75 100 -50 -25 0 25 50 Tem perature Ta(C) 75 100 RP504x 13) LX Current Limit vs. Temperature L X Current Limit llim (mA) 1000 950 900 850 800 -50 -25 0 25 50 75 Tem perature Ta(C) 100 15) Pch Tr. ON Resistance vs. Temperature 0.60 ON () 0.60 0.50 0.50 Pch Tr.ONResistance R Nch Tr.ONResistance R ON () 14) Nch Tr. ON Resistance vs. Temperature 0.40 0.30 0.20 0.10 0 -50 -25 0 25 50 75 Tem perature Ta(C) 0.40 0.30 0.20 0.10 0 100 -50 -25 0 25 50 75 Tem perature Ta(C) 100 16) Load Transient Response RP504x081x (VIN=3.6V) RP504x081x (VIN=3.6V) 0.90 0.80 0.70 Output Voltage 0.60 400 200 200 0 Output Current 300mA-->1mA 0 1.00 0.90 0.80 Output Voltage 0.70 Output Current IOUT (mA) 1.00 400 Output Voltage VOUT (V) Output Current 1mA-->300mA MODE="L"PWM/VFM automatic shift Output Current IOUT (mA) Output Voltage VOUT (V) MODE="L"PWM/VFM automatic shift 0.60 -10 0 10 20 30 40 50 60 70 80 90 Time t (s) -100 0 100 200 300 400 500 600 700 800 900 Time t (s) 23 RP504x RP504x081x (VIN=3.6V) RP504x081x (VIN=3.6V) MODE="H" forced PWM 200 200 0 1.00 0.90 0.90 0.80 Output Voltage 0.70 0.60 0.60 -10 0 10 20 30 40 50 60 70 80 90 -10 0 10 20 30 40 50 60 70 80 90 Time t (s) Time t (s) RP504x081x (VIN=3.6V) 600 400 400 200 0 1.00 0.90 0.80 Output Voltage 0.70 0.60 Output Voltage VOUT (V) Output Current 200mA-->500mA 600 Output Current IOUT (mA) Output Voltage VOUT (V) RP504x081x (VIN=3.6V) Output Current 500mA-->200mA 0.90 0.80 Output Voltage 0.70 0.60 -10 0 10 20 30 40 50 60 70 80 90 Time t (s) RP504x121x (VIN=3.6V) RP504x121x (VIN=3.6V) 1.20 1.15 Output Voltage 1.10 400 200 200 0 Output Current 300mA-->1mA 0 1.30 1.25 1.20 Output Voltage 1.15 1.10 -10 0 10 20 30 40 50 60 70 80 90 Time t (s) 24 400 Output Voltage VOUT (V) 1.25 MODE="L"PWM/VFM automatic shift Output Current IOUT (mA) Output Voltage VOUT (V) MODE="L"PWM/VFM automatic shift 1.30 0 1.00 -10 0 10 20 30 40 50 60 70 80 90 Time t (s) Output Current 1mA-->300mA 200 Output Current IOUT (mA) 0.70 Output Voltage 1.00 -100 0 100 200 300 400 500 600 700 800 900 Time t (s) Output Current IOUT (mA) 0.80 0 Output Current 300mA-->1mA Output Current IOUT (mA) 400 Output Voltage VOUT (V) Output Current 1mA-->300mA 400 Output Current IOUT (mA) Output Voltage VOUT (V) MODE="H" forced PWM RP504x RP504x121x (VIN=3.6V) RP504x121x (VIN=3.6V) 400 200 200 0 1.30 1.25 1.20 Output Voltage 1.15 Output Current 300mA-->1mA 1.30 1.25 1.20 Output Voltage 1.15 1.10 1.10 -10 0 10 20 30 40 50 60 70 80 90 -10 0 10 20 30 40 50 60 70 80 90 Time t (s) Time t (s) RP504x121x (VIN=3.6V) 600 400 400 0 1.30 1.25 1.15 Output Voltage 0 1.30 1.25 1.20 Output Voltage 1.15 1.10 1.10 -10 0 10 20 30 40 50 60 70 80 90 Time t (s) -10 0 10 20 30 40 50 60 70 80 90 RP504x181x (VIN=3.6V) RP504x181x (VIN=3.6V) Time t (s) MODE="L"PWM/VFM automatic shift 1.90 1.85 1.80 Output Voltage 1.70 400 400 200 200 0 Output Voltage VOUT (V) Output Current 1mA-->300mA MODE="L"PWM/VFM automatic shift Output Current IOUT (mA) Output Voltage VOUT (V) 200 0 Output Current 300mA-->1mA 1.90 1.85 1.80 1.75 Output Voltage Output Current IOUT (mA) 1.20 Output Current 500mA-->200mA Output Current IOUT (mA) 200 Output Voltage VOUT (V) Output Current 200mA-->500mA 600 Output Current IOUT (mA) Output Voltage VOUT (V) RP504x121x (VIN=3.6V) 1.75 0 Output Current IOUT (mA) 400 Output Voltage VOUT (V) Output Current 1mA-->300mA MODE="H" forced PWM Output Current IOUT (mA) Output Voltage VOUT (V) MODE="H" forced PWM 1.70 -10 0 10 20 30 40 50 60 70 80 90 Time t (s) -100 0 100 200 300 400 500 600 700 800 900 Time t (s) 25 RP504x RP504x181x (VIN=3.6V) RP504x181x (VIN=3.6V) 400 200 200 0 1.90 1.85 1.80 Output Voltage 1.75 1.70 0 Output Current 300mA-->1mA 1.90 1.85 1.80 Output Voltage 1.75 1.70 1.65 1.65 -10 0 10 20 30 40 50 60 70 80 90 Time t (s) -10 0 10 20 30 40 50 60 70 80 90 Time t (s) RP504x181x (VIN=3.6V) 200 1.85 1.80 1.75 Output Voltage 1.70 0 1.90 1.85 1.80 Output Voltage 1.75 1.70 -10 0 10 20 30 40 50 60 70 80 90 RP504x331x (VIN=5.0V) MODE="L"PWM/VFM automatic shift RP504x331x (VIN=5.0V) MODE="L"PWM/VFM automatic shift 3.50 3.40 Output Voltage 400 400 200 200 0 Output Voltage VOUT (V) Output Current 1mA-->300mA Time t (s) Output Current IOUT (mA) Output Voltage VOUT (V) 400 200 -10 0 10 20 30 40 50 60 70 80 90 Time t (s) 3.10 Output Current 300mA-->1mA 0 3.50 3.40 3.30 Output Voltage 3.20 3.10 -10 0 10 20 30 40 50 60 70 80 90 Time t (s) 26 600 1.65 1.65 3.20 Output Current 500mA-->200mA -100 0 100 200 300 400 500 600 700 800 900 Time t (s) Output Current IOUT (mA) 0 1.90 Output Voltage VOUT (V) 400 Output Current 200mA-->500mA Output Current IOUT (mA) Output Voltage VOUT (V) 600 Output Current IOUT (mA) RP504x181x (VIN=3.6V) 3.30 Output Current IOUT (mA) 400 Output Voltage VOUT (V) Output Current 1mA-->300mA MODE="H" forced PWM Output Current IOUT (mA) Output Voltage VOUT (V) MODE="H" forced PWM RP504x RP504x331x (VIN=5.0V) RP504x331x (VIN=5.0V) 400 200 200 0 3.50 3.40 3.30 Output Voltage 3.20 Output Voltage VOUT (V) Output Current 1mA-->300mA 400 3.10 3.50 3.40 3.30 Output Voltage 3.20 3.10 -10 0 10 20 30 40 50 60 70 80 90 -10 0 10 20 30 40 50 60 70 80 90 Time t (s) Time t (s) RP504x331x (VIN=5.0V) 400 400 200 0 3.50 3.40 3.30 Output Voltage 3.20 3.10 Output Voltage VOUT (V) 600 Output Current IOUT (mA) Output Current 200mA-->500mA 600 200 Output Current 500mA-->200mA 0 3.50 3.40 3.30 Output Voltage 3.20 Output Current IOUT (mA) RP504x331x (VIN=5.0V) Output Voltage VOUT (V) 0 Output Current 300mA-->1mA Output Current IOUT (mA) MODE="H" forced PWM Output Current IOUT (mA) Output Voltage VOUT (V) MODE="H" forced PWM 3.10 -10 0 10 20 30 40 50 60 70 80 90 -10 0 10 20 30 40 50 60 70 80 90 Time t (s) Time t (s) 17) Mode Switching Waveform RP504x (VIN=1.2V, IOUT=1mA) RP504x (VIN=1.2V, IOUT=1mA) MODE="L" --> MODE="H" MODE="H" --> MODE="L" 1.30 1.25 1.20 1.15 -100 Output Voltage 0 100 200 Time t (s) 300 400 Output Voltage VOUT (V) 0 Mode Input Voltage VMODE (V) Output Voltage VOUT (V) Mode Input Voltage Mode Input Voltage Mode Input Voltage VMODE (V) 5 5 0 1.30 1.25 1.20 1.15 -200 Output Voltage 0 200 400 600 800 Time t (s) 27 RP504x RP504x (VIN=1.8V, IOUT=1mA) RP504x (VIN=1.8V, IOUT=1mA) MODE="L" --> MODE="H" MODE="H" --> MODE="L" 1.85 1.80 Output Voltage 0 100 200 Time t (s) 300 400 Mode Input Voltage 0 1.90 1.85 1.80 1.75 -200 Output Voltage 0 200 400 Time t (s) 600 800 Mode Input Voltage VMODE (V) 1.90 1.75 -100 28 0 Output Voltage VOUT (V) Mode Input Voltage 5 Mode Input Voltage VMODE (V) Output Voltage VOUT (V) 5 1. The products and the product specifications described in this document are subject to change or discontinuation of production without notice for reasons such as improvement. Therefore, before deciding to use the products, please refer to Ricoh sales representatives for the latest information thereon. 2. The materials in this document may not be copied or otherwise reproduced in whole or in part without prior written consent of Ricoh. 3. Please be sure to take any necessary formalities under relevant laws or regulations before exporting or otherwise taking out of your country the products or the technical information described herein. 4. The technical information described in this document shows typical characteristics of and example application circuits for the products. The release of such information is not to be construed as a warranty of or a grant of license under Ricoh's or any third party's intellectual property rights or any other rights. 5. The products listed in this document are intended and designed for use as general electronic components in standard applications (office equipment, telecommunication equipment, measuring instruments, consumer electronic products, amusement equipment etc.). Those customers intending to use a product in an application requiring extreme quality and reliability, for example, in a highly specific application where the failure or misoperation of the product could result in human injury or death (aircraft, spacevehicle, nuclear reactor control system, traffic control system, automotive and transportation equipment, combustion equipment, safety devices, life support system etc.) should first contact us. 6. We are making our continuous effort to improve the quality and reliability of our products, but semiconductor products are likely to fail with certain probability. In order to prevent any injury to persons or damages to property resulting from such failure, customers should be careful enough to incorporate safety measures in their design, such as redundancy feature, firecontainment feature and fail-safe feature. We do not assume any liability or responsibility for any loss or damage arising from misuse or inappropriate use of the products. 7. Anti-radiation design is not implemented in the products described in this document. 8. Please contact Ricoh sales representatives should you have any questions or comments concerning the products or the technical information. Halogen Free For the conservation of the global environment, Ricoh is advancing the decrease of the negative environmental impact material. After Apr. 1, 2006, we will ship out the lead free products only. Thus, all products that will be shipped from now on comply with RoHS Directive. Basically after Apr. 1, 2012, we will ship out the Power Management ICs of the Halogen Free products only. (Ricoh Halogen Free products are also Antimony Free.) RICOH COMPANY, LTD. Electronic Devices Company http://www.ricoh.com/LSI/ RICOH COMPANY, LTD. Electronic Devices Company Higashi-Shinagawa Office (International Sales) 3-32-3, Higashi-Shinagawa, Shinagawa-ku, Tokyo 140-8655, Japan Phone: +81-3-5479-2857 Fax: +81-3-5479-0502 RICOH EUROPE (NETHERLANDS) B.V. Semiconductor Support Centre Nieuw Kronenburg Prof. W.H. Keesomlaan 1, 1183 DJ, Amstelveen, The Netherlands P.O.Box 114, 1180 AC Amstelveen Phone: +31-20-5474-309 Fax: +31-20-5474-791 RICOH ELECTRONIC DEVICES KOREA Co., Ltd. 11 floor, Haesung 1 building, 942, Daechidong, Gangnamgu, Seoul, Korea Phone: +82-2-2135-5700 Fax: +82-2-2135-5705 RICOH ELECTRONIC DEVICES SHANGHAI Co., Ltd. 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