19-0008; Rev 1; 11/96 areiehee VALU > & a Nina General Description The MAX751 is a +5V-output, CMOS, step-up, switch- mode DC-DC converter. Minimum input start-up voltage is 1.2V. From a 2.7V supply, the output current capability is guaranteed to be 150mA. Battery-saving features include 86% typical full-load efficiency, 2mA operating quiescent supply current, and 35pA shutdown supply current. The shutdown mode can be directly controlled by a microprocessor via the logic-compatible SHDN pin. The MAX751 is tested in-circuit, so output power speci- fications are guaranteed over alll line, load, and temper- ature ranges. The typical operating circuit uses tiny surface-mounted components, including a miniature MAXKLAA +5V-Output, Step-Up, Current-Mode PWM DC-DC Converter Features @ +5V Preset Output @ Guaranteed 150mA Output Current @ 1.2V Start-Up Supply Voltage @ 86% Typical Efficiencies at Full Load @ Smail 22H Inductor No Component Design Required @ 2mA Quiescent Current @ 35,A Logic-Controlled Shutdown Mode @ Overcurrent and Soft-Start Protection @ 170kHz High-Frequency Current-Mode PWM KSZXVUIN 22uH inductor, and fits into less than 0.5in2. @ 8-Pin DIP and SO Packages The MAX751 uses current-mode pulse-width modulation (PWM) control to provide precise output regulation and Ordering Information low subharmonic noise. A fixed 170kHz oscillator fre- _ quency facilitates ripple filtering and allows for the use of PART TEMP. RANGE PIN-PACKAGE _ tiny external capacitors. MAX751CPA 0C to +70C 8 Plastic DIP For higher-current solutions, refer to the MAX731/MAX752 and MAX751CSA 0C to +70C 8sO MAX848/MAX849 data sheets and evaluation kit manuals. The MAX751C/D OC to +70C Dice* MAX751 can be evaluated using the MAX731 evaluation kit MAX751EPA -40C to +85C 8 Plastic DIP KIT-DIP le of th 751CPA). _(order MAX7SIEV and a sample of the MAX ) MAX751ESA __-40C to +85C 8SO oS MAX751MJA -55C to +125C 8 CERDIP** Applications Local +5V Supply in +3V-Only Systems Cellular Phones * Dice are tested at Ta = +25C. Contact factory for availability and processing to MiL-STD-883. Typical Applicati. RF Transmitter Supply cation Circult Palmtop and Notebook Computers Battery-Powered and Hand-Held Instruments vv 1.20 5.25V Pin Configuration 22uH LX > SHDN V TOP VIEW Vout wv oC Ft oe = Ve L SHON [1 g] V+ anaxisn = TT VREF [2| ANAXAAA 7] Vout eno = t0qF ss [a] Max75? Fe] x T ce [4] [5] GND SS VREF + S TL DIP/SO = MAAXIAA Maxim Integrated Products 1 For free samples & the latest literature: http:/www.maxim-ic.com, or phone 1-800-998-8800MAX751 +5V-Output, Step-Up, Current-Mode PWM DC-DC Converter ABSOLUTE MAXIMUM RATINGS V+, LXtoGND ..... 0. -0.3V to +17V Operating Temperature Ranges: VouT to GND... ccc cece eee a ee t25V MAX751C_ ww ccc eee 0C to +70C SS, CC, SHDN to GND ............... +0.3V to (V+ + 0.3V) MAX751E__ ww cee eee eee -40C to +85C Peak Switch Current (ILX).. 62... cece eae 1.5A MAX7S1MJA oo. ee -55C to +125C Reference Current (IVREF) ..............000cc sees 2.5mA Junction Temperatures Continuous Power Dissipation (Ta = +70C) MAX751C__fE_ wees +150C Plastic DIP (derate 9.09mW/C above +70C) ...... 727mMW MAX751MJA o 0. cccccc eee eens +175C Wide SO (derate 5.88mW/C above +70C) ........ 471mw Storage Temperature Range .............. -65C to +160C CERDIP (derate 8.00mW/"C above 70C).......... 644mWw Lead Temperature (soldering, 10sec) .............. +300C 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. ELECTRICAL CHARACTERISTICS (Circuit of Figure 1, VIN = +3V, LOAD = OmA, Ta = TaIN to TMAX, typical values are at Ta = +25C, unless otherwise noted.) PARAMETER MIN TYP MAX 7 ILOAD = OMA MAX751C 1.2 1.8 Minimum Start-Up MAX751 1.2 2.2 Input Voltage 1C 29 27 1 2.2 3.0 = 2.7V to 5V, OmA < 5.00 .25 VIN = 2.7V to 5V =2.7Vto4 = OmA to 100mA VIN = =1 Includes switch current = OV, entire circuit = OV, into V+ ILOAD = 150mA Standby Current SHDN Input Threshold Current LX On LX 1.0 1 50 170 Pin 20 kQ Note 1: Circuit will regulate properly with an input voltage as high as 5.25V due to the voltage drop across the external diode. Note 2: Load-current capability is after start-up. 2 MAAXISAA+5V-Output, Step-Up, Current-Mode PWM DC-DC Converter Typical Operating Characteristics = (Circuit of Figure 1 in bootstrapped mode, L1 = 22uH, Ta = +25C, unless otherwise noted.) > SWITCHING WAVEFORMS- SWITCHING WAVEFORMS- o CONTINUOUS CONDUCTION DISCONTINUOUS CONDUCTION wl, A B C 2us/div A: SWITCH VOLTAGE (LX PIN), 2V/div B: INDUCTOR CURRENT, 200mA/div C: OUTPUT VOLTAGE RIPPLE, 50mV/div Vin = 3V, lout = 150mA LINE-TRANSIENT RESPONSE A 8 ams/div A: Vin, 2V/div, 3V TO 4V B: Vout, 200mV/div, AC-COUPLED lout = 180mA MAAXIAAN A B C 2us/div A: SWITCH VOLTAGE (LX PIN), 2V/div B: INDUCTOR CURRENT, 200mA/div C: OUTPUT VOLTAGE, RIPPLE, S0mV/div Vin = 3V, lout = 150mA LOAD-TRANSIENT RESPONSE LOA , B ams/div A: Vour, 50mV/div B: lout, 100mA/div, OmA to 200mA Vin = 3VMAX751 +5V-Output, Step-Up, Current-Mode PWM DC-DC Converter Typical Operating Characteristics (continued) (Circuit of Figure 1 in bootstrapped mode, L1 = 22pH, Ta = +25C, unless otherwise noted.) EFFICIENCY vs. OUTPUT CURRENT 92 90 88 xz > 84 a ap 78 76 Vin =+2V 74 0 50 100 150 200 250 300 350 400 OUTPUT CURRENT (mA) PEAK INDUCTOR CURRENT vs. OUTPUT CURRENT 800 = 700 5 600 za 500 = a 3 = 300 Em 00 0 50 100 150 200 250 300 350 400 OUTPUT CURRENT (mA) MAXIMUM OUTPUT CURRENT vs. MINIMUM OPERATING VOLTAGE 8 OUTPUT CURRENT (mA) 50 20 25 30 35 40 45 50 MINIMUM OPERATING VOLTAGE (V) EFFICIENCY vs. OUTPUT CURRENT (NON-BOOTSTRAPPED MODE) 92 90 88 z 86 3 84 & 8 Bg 78 76 Vex 74 0 50 100 150 200 250 300 350 400 OUTPUT CURRENT (mA) MAXIMUM OUTPUT CURRENT vs. MINIMUM START-UP INPUT VOLTAGE 120 = 100 Sw 3 = 60 > = 4 => = 3 20 0 10 #12 #14 +16 #18 20 MINIMUM START-UP INPUT VOLTAGE (V} START-UP TIME vs. OUTPUT CURRENT 250 200 VIN = +2V) Css = 0.1uF w 150 = 2 100 & OP Vn=42.75V 5 en =43v) wn 50 A Te La Ae" VIN = +4V LT | 0 50 100 150 200 250 300 350 400 OUTPUT CURRENT (mA) NO-LOAD SUPPLY CURRENT vs. SUPPLY VOLTAGE 8 = 7 & 6 = 5 > 4 E a 3 32 2 0 20 25 30 35 40 45 50 SUPPLY VOLTAGE (V) MAXIMUM OUTPUT CURRENT vs. MINIMUM OPERATING VOLTAGE 120 100 = S = 3 E = 4 3 20 0 1.0 12 14 16 18 2.0 MINIMUM OPERATING VOLTAGE (V) START-UP TIME vs. OUTPUT CURRENT 000 Vw = 42V Css = 1.0uF 300 Vin = g 600 =e = 400 as = a 200 0 0 50 100 150 200 250 300 350 400 OUTPUT CURRENT (mA) MAAXIAAN+5V-Output, Step-Up, Current-Mode PWM DC-DC Converter Typical Operating Characteristics (continued) (Circuit of Figure 1 in bootstrapped mode, L1 = 22H, Ta = +25C, unless otherwise noted.) MINIMIM OUTPUT CURRENT LEVELS TO MAINTAIN CONTINUOUS-CONDUCTION vs. SUPPLY VOLTAGE {= MINIMUM OUTPUT CURRENT (mA) 80 {= 26 28 30 32 34 36 SUPPLY VOLTAGE (V) 38 40 Pin Description FUNCTION Shutdown - active low. Tie to ground to power down the IC; tie to V+ for normal operation. The output power FET is held off when SHDN is low. Reference Voltage Output (+1.23V) supplies up to 100pA for external loads. Soft-Start. Capacitor between SS and GND provides soft-start and short-circuit protection. cc Compensation Capacitor Input. Externally PIN | NAME 1 SHDN 2 VREF 4 compensates the outer feedback loop. 5 GND_| Ground 6 Lx Drain of internal N-channel power MOSFET 7 Vout | Output-Voltage Sense Input Supply-Voltage Input. Tie to Vout for boot- 8 Ve strapped operation; connect input voltage source to V+ for non-bootstrapped opera- tion. Detailed Description Operating Principle The MAX751 switch-mode regulator uses a current-mode PWM controller in a simple boost regulator configuration to step up an unregulated DC voltage. The MAX751 converts a voltage ranging from 1.2V to 5.25V, to a 5V output. The current-mode PWM architecture provides cycle-by-cycle current limiting and excellent load-tran- sient response characteristics. MAAXIAA OSCILLATOR FREQUENCY vs. SUPPLY VOLTAGE OSCILLATOR FREQUENCY (kHz) 1 2 3 4 5 SUPPLY VOLTAGE (V) The controller consists of two feedback loops: an inner (current) loop that monitors the switch current through the current-sense resistor (RS) and amplifier, and an outer (voltage) loop that monitors the output voltage with an error amplifier (Figure 1). The inner loop performs cycle- by-cycle current limiting, truncating the power transistor on time when the switch current reaches a threshold determined by the outer loop. For example, a sagging output voltage produces an error signal that raises the threshold at the error amp output. This allows the inductor current (which generates the current-sense amp output voltage) to increase, resulting in more energy stored and transferred during each cycle. input Voltage Considerations The input voltage range has three important components: no-load start-up voltage, full-load start-up voltage and minimum operation voltage. The no-load starting voltage is typically 1.2V, but if a load is added, the start-up voltage increases (see Maximum Output Current vs. Min- imum Start-Up Input Voltage in the Typical Operating Characteristics). Above 2V, the Maximum Output Current vs. Start-Up Input Voltage graph is identical to the Maxi- mum Output Current vs. Minimum Operating Voltage graph. With a 2.7V input voltage, the MAX751 is guaran- teed to start up and regulate with a 150mA load. The minimum operating voltage is the valtage down to which the MAX751 will continue to provide a regulated 5V output. This voltage is very important in battery-oper- ated equipment because it indicates the voltage to which the battery can discharge without losing output regula- tion. The Maximum Output Current vs. Minimum Operat- = 5 <=MAX751 +5V-Output, Step-Up, Current-Mode PWM DC-DC Converter vw - es 2 01 a Ota vel = _[ SHON Nour u BAS MAAXOAA oe : GEN | ERRORAMP py, Zt MAX751 22uH or fos COMPARATOR uL 1NSB17 + OtpF : me |e Comal rl EL vREF | FF F 10nF ce | CURRENT Tuo Td SENSE AMP $s a >t <4 451 zfs 047uF CLAMP COMPENSATION ' OVERCURRENT COMPARATOR GND_L Figure 1. Detailed Block Diagram with External Components, Bootstrapped Mode ing Voltage graph in the Typical Operating Characteris- tics shows minimum operating values in bootstrapped mode. Input voltages as high as 5.25V can be applied without damage, but regulation is lost when the input exceeds the normal regulated output. This happens because a DC path through the inductor and diode produces an output voltage one diode drop less than the input voltage. (The MAX751 senses this high output and stops switching.) This path exists even with the IC removed from the circuit. Bootstrapped vs. Non-Bootstrapped Mode Figure 2 shows the "bootstrappec" circuit for the MAX751. In bootstrapped mode, V+ is tied to VoUT so that the MAX751 operates from the output it generates, providing increased gate-drive voltage for the internal power switch. In bootstrapped mode, the MAX751 furnishes 150mA from an input as low as 2.2V. In Figure 3's non-bootstrapped mode circuit, the input voltage is applied to the V+ pin. In non-bootstrapped mode, the MAX751 operates with a lower supply current, but has lower output power capability than in boot- strapped mode due to the decreased gate-drive voltage. This mode is best in applications where small load cur- rents are required and the input voltage is greater than 2.7V (which provides adequate gate drive for the power INPUT SHON OUTPUT V+ MAAXLZA MAX751 Vout cc rt O.1pF SS GND VREF C7 373725 Op o4tuF | Tue OPTIONAL LOWPASS OUTPUT FILTER OUTPUT OUTPUT ip + of 2H TD 2dr igure 2. Standard-Boost Application Circuit (Bootstrapped lode) PAAXIAA+5V-Output, Step-Up, Current-Mode PWM D1 1N5817 MAAXLZA MAX751 7 Vout + 5 cc mi O.1pF SS GND VREF c7 = tt ci 35) 2 Ce T O.1pF 100uF o1prF C4 Figure 3. Standard-Boost Application Circuit (Non-Bootstrapped lode) FET). A 100uF bypass capacitor in parallel with a 0.1pF capacitor is recommendied at the V+ pin. Programmable Soft-Start The Soft-Start (SS) pin limits power-up current, allowing proper start-up with a load on the output. On power-up, the MAX751 uses the maximum switch duty cycle to draw excessive current to charge the output filter capacitor, and supply current to the load. In this case, the device may stall and the output voltage will not rise to 5V. A capacitor (between 0.047pyF and 5yF) is required on SS to ensure proper start-up. The larger the capacitor, the slower the internal current-limit threshold is raised, allowing more time for start-up. As the voltage on the SS pin increases, the voltage at the SS clamp output in- creases, which in turn increases the current-limit thresh- old (Figure 1). Overcurrent Limiting When the peak switch current exceeds approximately 1.5A, the output stage is turned off by the inner loop cycle-by-cycle current-limiting action, and the overcurr- ent comparator signals the control logic to initiate an SS cycle. On each clock cycle, the output FET turns on again and attempts to deliver current until cycle-by-cycle or overcurrent limits are exceeded. Note that the SS capacitor must be at least 0.01pF for overcurrent protec- tion to function properly. The overcurrent limit protects the MAX751, but does not interrupt the DC path through the inductor and the diode. Do not exceed the maximum current ratings of the induc- tor and diode. MAAXIAA DC-DC Converter Shutdown Shutdown (SHDN) is a logic level active-low input. When the voltage applied to SHDN is greater than 2V, the MAX751 is guaranteed to operate normally. Connect SHDN to V+ for normal operation. Keeping SHDN at ground holds the MAX71 in shutdown mode. In shut- down mode, the output power FET is off, the internal reference is turned off (which causes the soft-start ca- pacitor to discharge), but there is an external path from V+ to the load through the inductor and diode, and another path from V+ to GND through the inductor, diode, and internal feedback resistors. Typical device standby current in shutdown mode is 35pA. Operation Modes Continuous-Current Mode: In continuous mode, cur- rent always flows in the inductor, and the control circuit adjusts the switchs duty-cycle on a cycle-by-cycle basis to maintain regulation without exceeding the switch-cur- rent capability. Continuous mode is a function of the input-output voltage differential, the inductor value, and the load current. This mode provides excellent load-tran- sient response. With light loads, the MAX751 automati- cally operates in discontinuous mode. As the load increases, the inductor current rises, and at some point the circuit enters continuous mode. Continuous mode operation gives a cleaner output than discontinuous or pulse-skipping modes, because peak-to-peak ripple am- plitude is minimized and the ripple frequency is fixed at the oscillator frequency, making output noise easy to filter. Discontinuous-Current Mode: In discontinuous mode, current through the inductor starts at zero, rises toa peak value, then ramps down to zero on each cycle. Although efficiency is still excellent, the output ripple increases slightly and the switch waveforms display ringing at the inductors self-resonant frequency. This ringing is to be expected. Pulse-Skipping Mode: At load currents under a few milliamperes, even discontinuous-current mode tends to put more energy into the coil than the load requires, so the controller changes to pulse-skipping mode, in which regulation is achieved by skipping entire cycles. Effi- ciency is still good, typically 70% to 80%, reduced in part because the MAX751 quiescent supply current becomes a significantly larger fraction of the total current when load currents are low. Pulse-skipping switch waveforms can be irregular, and the output ripple contains a low-fre- quency component that may exceed 50mV. Larger, low-ESR filter capacitors can help reduce the ripple voltage in critical applications. KSZXUINMAX751 +5V-Output, Step-Up, Current-Mode PWM DC-DC Converter Applications information Figure 2 shows the standard step-up application circuit for continuous mode operation. This circuit starts up and operates with inputs from 1.2V to 5.25V. The output current capability is a function of the input voltage (Typ- ical Operating Characterisitics). inductor Selection A 22uH inductor is optimal for most MAX751 designs. Do not exceed the inductor's incremental saturation (see Peak Inductor Current vs. Output Current, Typical Oper- ating Characteristics). Table 1 lists various inductor types and.suppliers. The listed surface-mount inductors efficiencies are nearly equivalent to those of the larger- sized, through-hole inductors. Output Filter Capacitor Selection The primary criterion for selecting the output filter capac- itor is low equivalent series resistance (ESR). The prod- uct of the inductor current variation and the output capacitors ESR determines the high-frequency ripple observed on the output voltage. The output filter capacitor's ESR should be minimized to maintain AC stability. Refer to Table 1 for suggested capacitor suppliers. In the standard application of Figure 2, the output capac- itor value should be at least 100uF in order to maintain stability at full loads. 150yF capacitors (MAXC001) are available from Maxim in production quantities. Lower capac- itor values can be used with lighter loads. Other Components Use a Schottky diode with a continuous-current rating of at least 500mA for full-load (2 200mA) operation. The 1N5817 is a good choice. The two compensation capac- itor values at the CC input are critical because they have been selected to provide the best transient response. The input capacitor (C3 in Figures 1, 2, and 4) may be omitted if the power supply impedance is very low. Otherwise, up to 100nuF may be necessary. Soft-Start Considerations The supply voltage must rise at a faster rate than the voltage at the SS pin to avoid defeating SS. Table 2 lists SS timing characteristics for selected capacitor values. The output voltage sags if soft-start operation is defeated. With low input voltages and high load currents, if the power supply glitches momentarily, the MAX751 may not restart properly. This occurs if SS has not discharged before power is reapplied, thus defeating SS operation. If an input voltage glitch causes the MAX7571 to stall, remove the load or restart the MAX751 to return the circuit to normal operation. Otherwise, use Figure 4's circuit. Table 1. Component Suppliers PRODUCTION METHOD INDUCTORS CAPACITORS Sumida Matuso CD54-220 (22H) | 267-series Surface Mount Coiltronics CTX20-1 Miniature Sumida Sanyo Os-Con Through-Hole | RCH654-220 Os-Con-series Low-ESR organic semiconductor Low-Cost Renco Maxim Through-Hole | RL 1284-22 MAXC001 150pF, low-ESR Coilcraft electrolytic PCH-27-223 Nichicon PL-series Low-ESR electrolytic United Chemi-Con LXF-series Coilcraft (708) 639-6400 Coiltronics (561) 241-7876 Matsuo USA (714) 969-6291, FAX (714) 960-6492 Matsuo Japan (06) 332-0871 Nichicon (708) 843-7500, FAX (708) 843-2798 Renco (516) 586-5566, FAX (516) 586-5562 Sanyo Os-Con, USA Sanyo Os-Con, Japan Sumida USA Sumida Japan United Chemi-Con Table 2. Typical Soft-Start Timing (619) 661-6835 (0720) 70-1005, FAX (0720) 70-1174 (708) 956-0666 (03) 3607-5111, FAX (03) 3607-5428 (708) 696-2000, FAX (708) 640-631 1 Vin = 3V, Court = 100uF Rise-Time Fall-Time Cgs (uF) Time Constant Time Constant (tr) (sec) (tr) (sec) 0.047 60m 320m 0.1 140m 400m 0.47 600m 11 1.0 1.3 1.7 2.2 3.0 4.0 47 6.2 8.0 MAAXLAN+5V-Output, Step-Up, Current-Mode PWM DC-DC Converter Table 3. PWM DC-DC Converters vw OUTPUT es DEVICE | FUNCTION | VOLTAGE | PIN-PACKAGE L 2pH (Vv) i A 1N5817_ gytpUT MAX730_| Step-Down +5 8 DIP,8SO SHON x bie MAX731_| Step-Up +5 8 DIP, 16 SO am MAX732_ | Step-Up +12 8 DIP, 16 SO 5 8 S tom = vot MAX733_| Step-Up +15 8 DIP, 16 SO = =O O.1HF MAX734_| Step-Up +12 8 DIP, 8SO a! $s Vout 2 t x MAX735_|_ inverting 6 8 DIP, 8SO osL aye Ettou MAX736_| Inverting 12 14 DIP, 16 SO > how ce Ht = MAX737__| inverting -15 14 DIP 16S0 ore VREF MAX738_| Step-Down +5 8 DIP, 16 SO Att = nae MAX739_| Step-Down 5 14 DIP. 16 SO 1N5817. = = MAX741_| Controller Adjustable | 20 DIP 20 SSOP BF MAX750_| Step-Down | Adjustable | 8 DIP, 8SO Oss VALUE DEPENDS ON Vio RISE TIME. MAX752_| Step-Up Adjustable | 8 DIP, 16 SO _ MAX755_|_Inverting Adjustable | 8 DIP. 8SO Fi 4, Rapid Soft-Start Discharge Circuit IQUE 4. EPIC SOT SITE DISENATGS CCU! MAX758 | Step-Down | Adjustable | 8 DIP, 16 SO MAX759_| _Inverting Adjustable | 14 DIP 16 SO Printed Circuit Layout The power-up SS charge rate is determined by the time constant formed by the SS capacitor and the internal 1.4MQ. +25% resistor between VREF and SS (Figure 1). Output-Ripple Filtering An optional lowpass filter (Figure 2 inset) can be added to the output to reduce output ripple to about 5mVp-p. The cutoff frequency of the filter shown is 21kHz. Since the filter inductor is in series with the circuit output, minimize its resistance to avoid excessive voltage drop. The feedback must be taken before the filter, not after. MAAXLAA Printed circuit board layout is not critical, except to ensure quiet operation. Bypass capacitors, particularly between V+ and GND, should be located as close to the device as possible to prevent instability and noise pickup. The Schottky diode leads should also be kept short to prevent fast rise-time pulses in the output. High- current paths should be as short as possible. A ground plane is recommended, but not necessary. Minimize stray capacitance at the LX node. The MAX751 can be evaluated using the MAX731EVKIT-DIP (order MAX751CPA sample when ordering the kit). KSZLXVIN+5V-Output, Step-Up, Current-Mode PWM DC-DC Converter Chip Topography CONNECT SUBSTRATE TO V+; TRANSISTOR COUNT: 222 10 MAAXIAA+5V-Output, Step-Up, Current-Mode PWM DC-DC Converter Package Information = cHistHent ati a pe E | D pe 1 fo dt tt Vas a AAC 8 + ae ; I \ Lari ff wilh i 4 v u L.4 ni LL og SH B eB NOTES: 1. D&E DO NOT INCLUDE MOLD FLASH GOR PROTRUSIONS MOLD FLASH OR PROTRUSIONS SHALi NOT EXCEED 10 2. CONTROLLING DIMENSION INCH GL PDIP QUTLINE 3.MEETS JEDEC MS-001 AB Lemand [" [a 7 21-324 A MILLIMETERS MIN MAX 133 [fb 016 | 6.25 a. 0.49 G19 | 0.25 496 | 5.00 1 esc oe | NOTES: 4. BRE DO NOT INCLUDE MOLD FLASH 2 MOLD FLASH OR PROTRUSIONS NOT TO EXCEED JSmm (006) 3. CONTROLLING DIMENSION MILLIMETER 4 MEETS JEDEC MS-032 AA. MAXIAA 11MAX751 +5V-Output, Step-Up, Current-Mode PWM DC-DC Converter Package Information (continued) 1 si! ri [ia MAXIM | Fan aes Se fam @L_CERDIP OUTLINE [*e1-326 Ie [7 MEETS 38510 CASE "P"; 0-4, CONFIGURATION #1 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 12 Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 1996 Maxim Integrated Products Printed USA MAAXIAA is a registered trademark of Maxim integrated Products.