Si91821 Vishay Siliconix Micropower 300-mA CMOS LDO Regulator With Error Flag FEATURES D Input Voltage: 2.35-6.0 V D Fixed 1.8-V, 2.5-V, 2.8-V, 3.0-V, 3.3-V, 5.0-V, or Adjustable Output Voltage Options D Low 120-mV Dropout at 300-mA Load D Guaranteed 300-mA Output Current D 500-mA Peak Output Current Capability D Uses Low ESR Ceramic Output Capacitor D Fast Load and Line Transient Response D Only 100-mV(rms) Noise With Noise Bypass Capacitor Available D 1-mA Maximum Shutdown Current D Built-in Short Circuit and Thermal Protection D Out-Of-Regulation Error Flag (Power_Good) APPLICATIONS D Cellular Phones D Laptop and Palm Computers D PDA, Digital Still Cameras DESCRIPTION The Si91821 is a 300-mA CMOS LDO (low dropout) voltage regulator. The device features ultra low ground current and dropout voltage to prolong battery life in portable electronics. The Si91821 offers line and load transient response and ripple rejection superior to that of bipolar or BiCMOS LDO regulators. The device is designed to maintain regulation while delivering 500-mA peak current. This is useful for systems that have high surge current upon turn-on. The Si91821 is designed to drive the lower cost ceramic, as well as tantalum, output capacitors. The device is guaranteed stable from maximum load current down to 0-mA load. In addition, an external noise bypass capacitor connected to the device's CNOISE pin will lower the LDO's output noise for low noise applications. The Si91821 also includes an out-of-regulation error flag. When the output voltage is 5% below its nominal output voltage, the error flag output goes low. The Si91821 is available in both standard and lead (Pb)-free MSOP-8 packages and is specified to operate over the industrial temperature range of -40 _C to 85 _C. TYPICAL APPLICATIONS CIRCUITS 7 VIN SD ERROR 2 VIN VOUT 6 CNOISE 2.2 mF GND 3 SET GND 8 7 1, 4 VIN VOUT 5 2.2 mF SD ERROR 2 VIN VOUT 6 CNOISE 3 GND 2.2 mF GND Optional Si91821 Figure 1. 1, 4 SET VOUT 5 2.2 mF Si91821 Fixed Output Figure 2.. 7 ON/OFF VIN 2.2 mF 8 0.033 mF GND SD ERROR 2 VIN 6 CNOISE 3 GND VOUT SET 8 1, 4 5 Adjustable Output POWER_GOOD 1 MW VOUT 2.2 mF Si91821 Figure 3. Document Number: 71614 S-51147-Rev. E, 20-Jun-05 Fixed Output, Low Noise, Full Features Application www.vishay.com 1 Si91821 Vishay Siliconix ABSOLUTE MAXIMUM RATINGS Input Voltage, VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.5 V SD Input Voltage, VSD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 V to VIN Output Current, IOUT . . . . . . . . . . . . . . . . . . . . . . . . . . Short Circuit Protected Output Voltage, VOUT . . . . . . . . . . . . . . . . . . . . . . . . -0.3 V to VO(nom) + 0.3 V Maximum Junction Temperature, TJ(max) . . . . . . . . . . . . . . . . . . . . . . . 150_C Storage Temperature, TSTG . . . . . . . . . . . . . . . . . . . . . . . . . . -55_C to 150_C ESD (Human Body Model) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 kV Power Dissipation (Package)a 8-Pin MSOPb . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 666 mW Thermal Impedance (QJA)a 8-Pin MSOPb . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185_C/W Notes a. Device mounted with all leads soldered or welded to PC board. b. Derate 10 mW/_C above TA = 25_C Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. RECOMMENDED OPERATING RANGE Input Voltage, VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.35 V to 6 V IOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 300 mA Output Voltage, VOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5 to 5.0 V Operating Ambient Temperature, TA . . . . . . . . . . . . . . . . . . . . -40_C to 85_C SD Input Voltage, VSD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V to VIN Operating Junction Temperature, TJ . . . . . . . . . . . . . . . . . . . -40_C to 125_C CIN = 2.2 mF, COUT = 2.2 mF (ceramic, X5R or X7R type) , CNOISE = 0.033 mF (ceramic) COUT Range = 1 mF to 10 mF ("10%, x5R or x7R type) CIN w COUT SPECIFICATIONS Test Conditions Unless Otherwise Specified Parameter Symbol Input Voltage VIN = VOUT(nom) + 1 V V, IOUT = 1 mA A CIN = 2.2 mF, COUT = 2.2 mF, VSD = 1.5 V Tempa 2.35 6.0 Full 1.5 5.0 Room -1.5 1.5 Full -2.5 2.5 Room 1.191 Full 1.179 1.251 From VIN = VOUT(nom) + 1 V to VOUT(nom) + 2 V Full -0.18 0.18 From VIN = 5.5 V to 6 V Full -0.18 0.18 VOUT = 1.5 V From VIN = 2.5 V to 3.5 V Full -0.18 0.18 VOUT = 5 V From VIN = 5.5 V to 6 V Full -0.18 IOUT = 10 mA Room 5 20 IOUT = 200 mA Full 80 135 IOUT = 300 mA Full 120 200 270 VIN Output Voltage VOUT Adjustable Version Output Voltage Accuracy (to stated output voltage) VOUT 1 mA v IOUT v 300 mA Feedback Voltage (ADJ Version) VSET Line Regulation (Except 5-V Version) Line Regulation (5-V Version) DVOUT VIN 100 VOUT(nom) Line Regulation (ADJ Version) Dropout p Voltage g d Ground Pin Current Shutdown Supply Current Peak Output Current Output Noise Voltage Ripple pp Rejection j www.vishay.com 2 Limits -40 to 85_C VIN - VOUT Minb Typc 1.215 IOUT = 0 mA Full 150 Room 500 IOUT = 300 mA Room 600 IIN(off) VSD = 0 V Room IO(peak) VOUT w 0.95 x VOUT(nom), tpw = 2 ms Room eN DVOUT/DVIN 0.1 500 V % VOUT(nom) V %/V mV mA 1 mA w/o CNOISE Room 260 CNOISE = 0.1 mF Room 37 BW = 10 to 100 kHz IOUT = 10 mA CNOISE = 33 nF Room 54 f = 1 kHz Room 60 IOUT = 150 mA f = 10 kHz Room 50 f = 100 kHz Room 40 BW = 10 Hz to 100 kHz IOUT = 150 mA 1.239 Unit 0.18 IOUT = 200 mA IGND Maxb mV (rms) dB Document Number: 71614 S-51147-Rev. E, 20-Jun-05 Si91821 Vishay Siliconix SPECIFICATIONS Test Conditions Unless Otherwise Specified Parameter Symbol VIN = VOUT(nom) + 1 V, IOUT = 1 mA CIN = 2.2 mF, COUT = 2.2 mF, VSD = 1.5 V Limits -40 to 85_C Tempa Minb Typc Dynamic Line Regulation DVO(line) VIN : VOUT(nom) + 1 V to VOUT(nom) + 2 V tr/tf = 5 ms, IOUT = 250 mA Room 10 Dynamic Load Regulation DVO(load) IOUT : 1 mA to 150 mA, tr/tf = 2 ms Room 30 Turn-on Overshoot DVOOS VIN followed by SD = High Event CNOISE v 100 nF Room VOUT Turn-On-Time tON COUT = 10 mF, VOUT to 90% of final value, VIN = 3.6 V Room 350 Maxb Unit mV 2.5 % mS Thermal Shutdown Thermal Shutdown Junction Temp TJ(s/d) Room 165 Thermal Hysteresis THYST Room 20 Short Circuit Current ISC VOUT = 0 V Room 800 VIH High = Regulator ON (Rising) Full VIL Low = Regulator OFF (Falling) Full IIH VSD = 0 V, Regulator OFF Room 0.01 IIL VSD = 6 V, Regulator ON Room 1.0 Full 100 0.01 _C mA Shutdown Input SD Input Voltage SD Input Currente Shutdown Hysteresis VHYST 1.5 VIN V 0.4 mA mV Error Output Output High Leakage IOFF ERROR = VOUT(nom) Full Output Low Voltage VOL ISINK = 2 mA Full Power_Good Trip Threshold f, g (Rising) VTH Hysteresis f VHYST Error Delay tDELAY Full Room CNOISE v 100 nF Full 2 mA 0.4 0.93 x VOUT 0.95 x VOUT 0.97 x VOUT V 10 mS 2% x VOUT Notes a. Room = 25_C, Full = -40 to 85_C. b. The algebraic convention whereby the most negative value is a minimum and the most positive a maximum. c. Typical values are for DESIGN AID ONLY, not guaranteed nor subject to production testing and are measured at TA = 25_C. d. The dropout voltage is defined as VIN - VOUT when VOUT is 100 mV below the value of VOUT for VIN = VOUT + 2 V. This is applicable for voltages of 2.5 V or higher. e. The device's shutdown pin includes a typical 6-MW internal pull-down resistor connected to ground. f. VOUT is defined as the output voltage of the DUT at 1 mA. g. Typical only, from VOUT = 2.0 V to VOUT = 1.5 V. Document Number: 71614 S-51147-Rev. E, 20-Jun-05 www.vishay.com 3 Si91821 Vishay Siliconix TIMING WAVEFORMS VIH SD VIL tON VNOM = 0.95 VNOM VOUT tDELAY ERROR Figure 4. tDELAY Timing Diagram for Power-Up PIN CONFIGURATION MSOP-8 vOUT 1 8 ERROR vIN 2 7 SD GND 3 6 CNOISE VOUT 4 5 SET Top View PIN DESCRIPTION Pin Number Name 1, 4 VOUT 2 VIN 3 GND Ground pin. Local ground for CNOISE and COUT. 5 SET For fixed output voltage versions, this pin could be connected to GND. For adjustable output voltage version, this voltage feedback pin sets the output voltage via an external resistor divider. 6 CNOISE 7 SD 8 ERROR www.vishay.com 4 Function Output voltage. Connect COUT between this pin and ground. Input supply pin. Bypass this pin with a 2.2-mF ceramic or tantalum capacitor to ground. Noise bypass pin. For low noise applications, a 0.01-mF or larger ceramic capacitor should be connected from this pin to ground. By applying less than 0.4 V to this pin, the device will be turned off. Connect this pin to VIN if unused. This open drain output is an error flag output which goes low when VOUT drops 5% below its nominal voltage. Document Number: 71614 S-51147-Rev. E, 20-Jun-05 Si91821 Vishay Siliconix BLOCK DIAGRAM Switches shown for device in normal operating mode (SD = HIGH) 5 SET 6 CNOISE 2 VIN CIN 2.2 mF 7 SD ON + - RFB2 OFF 1, 4 60 mV 6 MW RFB1 GND To VIN 2 mA + + - 1.215 V VREF 3 - ERROR 8 + - 6 SET REXT + Figure 5. 5 VOUT COUT 2.2 mF 300-mA CMOS LDO Regulator CNOISE 2 VIN CIN 2.2 mF R2 VSET 7 SD R1 ON + - OFF To VIN 1, 4 60 mV 6 MW 2 mA + + - GND 3 1.215 V VREF Figure 6. Document Number: 71614 S-51147-Rev. E, 20-Jun-05 + - VOUT COUT 2.2 mF REXT - 8 ERROR + 300-mA CMOS LDO Regulator (Adjustable Output) www.vishay.com 5 Si91821 Vishay Siliconix DETAILED DESCRIPTION The Si91821 is a low drop out, low quiescent current, and very linear regulator with very fast transient response. It is primarily designed for battery powered applications where battery run time is at a premium. The low quiescent current allows extended standby time while low drop out voltage enables the system to fully utilize battery power before recharge. The Si91821 is a very fast regulator with bandwidth exceeding 50 kHz while maintaining low quiescent current at light load conditions. With this bandwidth, the Si91821 is the fastest LDO available today. The Si91821 is stable with any output capacitor type from 1 mF to 10.0 mF. However, X5R or X7R ceramic capacitors are recommended for best output noise and transient performance. VIN VIN is the input supply pin. The bypass capacitor for this pin is not critical as long as the input supply has low enough source impedance. For practical circuits, a 1.0-mF or larger ceramic capacitor is recommended. When the source impedance is not low enough and/or the source is several inches from the Si91821, then a larger input bypass capacitor is needed. It is required that the equivalent impedance (source impedance, wire, and trace impedance in parallel with input bypass capacitor impedance) must be smaller than the input impedance of the Si91821 for stable operation. When the source impedance, wire, and trace impedance are unknown, it is recommended that an input bypass capacitor be used of a value that is equal to or greater than the output capacitor. VOUT VOUT is the output voltage of the regulator. Connect a bypass capacitor from VOUT to ground. The output capacitor can be any value from 1.0 mF to 10.0 mF. A ceramic capacitor with X5R or X7R dielectric type is recommended for best output noise, line transient, and load transient performance. SET SET is not connected internally for the fixed voltage version. Therefore, it can be connected to GND optionally. For the adjustable output version, use a resistor divider R1 and R2, connect R1 from VOUT to SET and R2 from SET to ground. R2 should be in the 25-kW to 150-kW range for low power consumption, while maintaining adequate noise immunity. The formula below calculates the value of R1, given the desired output voltage and the R2 value. R1 + VOUT * VSETR 2 (1) VSET VSET is nominally 1.215 V. SHUTDOWN (SD) SD controls the turning on and off of the Si91821. VOUT is guaranteed to be on when the SD pin voltage equals or is greater than 1.5 V. VOUT is guaranteed to be off when the SD pin voltage equals or is less than 0.4 V. During shutdown mode, the Si91821 will draw less than 2-mA current from the source. To automatically turn on VOUT whenever the input is applied, tie the SD pin to VIN. ERROR ERROR is an open drain output that goes low when VOUT is less than 5% of its normal value. As with any open drain output, an external pull up resistor is needed. This function is active in shutdown. The ERROR pin must be left opened if not used. CNOISE GND Ground is the common ground connection for VIN and VOUT. It is also the local ground connection for CNOISE, SET, and SD. www.vishay.com 6 For low noise application, connect a high frequency ceramic capacitor from CNOISE to ground. A 0.01-mF or a 0.1-mF X5R or X7R is recommended. Document Number: 71614 S-51147-Rev. E, 20-Jun-05 Si91821 Vishay Siliconix ORDERING INFORMATION Standard Part Number Lead (Pb)-Free Part Number Marking Voltage 1.80 V Si91821DH-18-T1 Si91821DH-18-T1--E3 1821 1800 Si91821DH-25-T1 Si91821DH-25-T1--E3 1821 2500 2.50 V Si91821DH-28-T1 Si91821DH-28-T1--E3 1821 2800 2.80 V Si91821DH-30-T1 Si91821DH-30-T1--E3 1821 3000 3.00 V Si91821DH-33-T1 Si91821DH-33-T1--E3 1821 3300 3.30 V Si91821DH-50-T1 Si91821DH-50-T1--E3 1821 5000 5.00 V Si91821DH-AD-T1 Si91821DH-AD-T1--E3 1821 ADJ Adjustable Temperature Range Package -40 to 85_C MSOP-8 Eval Kit Temperature Range Board Type Si91821DB -40 to 85_C Surface Mount TYPICAL CHARACTERISTICS (INTERNALLY REGULATED, 25_C UNLESS NOTED) Dropout Voltage vs. Load Current Dropout Characteristic 250 3.5 VOUT = 2.775 V VOUT = 2.775 V RLOAD = 16.5 W 3.0 200 150 V OUT (V) V DROP (mV) 2.5 100 2.0 1.5 1.0 50 0.5 0 0.0 0 100 200 300 ILOAD (mA) Document Number: 71614 S-51147-Rev. E, 20-Jun-05 400 500 0 1 2 3 4 5 6 VIN (V) www.vishay.com 7 Si91821 Vishay Siliconix TYPICAL CHARACTERISTICS (INTERNALLY REGULATED, 25_C UNLESS NOTED) Dropout Voltage vs. Temperature 180 Normalized Output Voltage vs. Load Current 0.30 IOUT = 300 mA VOUT = 2.775 V 0.15 IOUT = 200 mA V DROP (mV) 120 90 60 Output Voltage (%) 150 30 0.00 -0.15 -0.30 -0.45 -0.60 0 -50 IOUT = 10 mA IOUT = 0 mA -25 0 25 50 75 100 125 -0.75 150 0 50 100 Junction Temperature (_C) Normalized VOUT vs. Temperature 0.6 300 350 -0.2 IOUT = 0 mA -0.4 -0.6 -0.8 IOUT = 100 mA -1.0 Dropout Voltage (mV) 140 -0.0 IOUT = 300 mA -1.4 -1.6 -40 -20 0 20 40 60 80 100 120 120 IOUT = 300 mA 100 80 60 IOUT = 200 mA 40 -1.2 20 0 2.0 140 IOUT = 10 mA 2.5 3.0 Junction Temperature (_C) 200 1200 I GND ( mA) 1500 150 85_C 100 25_C -40_C 1 2 3 5.0 IOUT = 300 mA 600 IOUT = 200 mA 4 Input Voltage (V) www.vishay.com 4.5 900 300 0 0 4.0 GND Pin Current vs. Temperature and Load 250 50 3.5 VOUT No Load Current vs. Input Voltage I GND ( mA) 250 160 0.2 8 200 Dropout Voltage vs. VOUT 180 0.4 V OUT (%) 150 Load Current (mA) 5 6 7 0 -40 IOUT = 0 mA -20 0 20 40 60 80 100 120 140 Junction Temperature (_C) Document Number: 71614 S-51147-Rev. E, 20-Jun-05 Si91821 Vishay Siliconix TYPICAL WAVEFORMS Load Transient Response-1 Load Transient Response-2 VOUT 10 mV/div VOUT 10 mV/div ILOAD 100 mA/div ILOAD 100 mA/div 5.00 ms/div VOUT = 2.775 V COUT = 2.2 mF ILOAD = 1 to 150 mA trise = 2 msec 5.00 ms/div Load Transient Response-3 VOUT = 2.775 V COUT = 2.2 mF ILOAD = 150 to 1 mA tfall = 2 msec Load Transient Response-4 VOUT 10 mV/div VOUT 10 mV/div ILOAD 100 mA/div ILOAD 100 mA/div 5.00 ms/div VOUT = 2.775 V COUT = 1.0 mF ILOAD = 1 to 150 mA trise = 2 msec 5.00 ms/div LineTransient Response-1 VOUT = 2.775 V COUT = 1.0 mF ILOAD = 150 to 1 mA tfall = 2 msec LineTransient Respons-2 VOUT 2 V/div VIN 2 V/div VOUT 10 mV/div 20 ms/div Document Number: 71614 S-51147-Rev. E, 20-Jun-05 VOUT 10 mV/div VINSTEP = 4.77 to 5.77 V VOUT = 2.775 V COUT = 2.2 mF CIN = 2.2 mF ILOAD = 300 mA trise = 5 msec 20 ms/div VINSTEP = 5.77 to 4.77 V VOUT = 2.775 V COUT = 2.2 mF CIN = 2.2 mF ILOAD = 300 mA tfall = 5 msec www.vishay.com 9 Si91821 Vishay Siliconix TYPICAL WAVEFORMS Turn-On Sequence Turn-Off Sequence VIN CH-3 2 V/div VIN 2 V/div VOUT CH-1 2 V/div VOUT 2 V/div ERROR 2 V/div ERROR CH-2 2 V/div 100 ms/div 20 ms/div VIN = 4 V VOUT = 2.775 V CNOISE = 0.033 mF ILOAD = 300 mA Output Noise VIN = 4 V VOUT = 2.775 V CNOISE = 0.033 mF ILOAD = 300 mA Noise Spectrum 20.0 mV Hz 200 mV/div 0.01 10 ms/div VIN = 3.80 V VOUT = 2.775 V IOUT = 300 mA CNOISE = 0.033 mF BW = 10 Hz to 1 MHz 10 Hz VIN = 3.80 V VOUT = 2.775 V/10 mA CNOISE = 0.033 mF 1 MHz Vishay Siliconix maintains worldwide manufacturing capability. Products may be manufactured at one of several qualified locations. Reliability data for Silicon Technology and Package Reliability represent a composite of all qualified locations. For related documents such as package/tape drawings, part marking, and reliability data, see http://www.vishay.com/ppg?71614. www.vishay.com 10 Document Number: 71614 S-51147-Rev. E, 20-Jun-05