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MAX742 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX742 Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 12 page _______________General Description The MAX742 DC-DC converter is a controller for dual-out- put power supplies in the 3W to 60W range. Relying on simple two-terminal inductors rather than transformers, the MAX742 regulates both outputs independently to within ±4% over all conditions of line voltage, temperature, and load current. The MAX742 has high efficiency (up to 92%) over a wide range of output loading. Two independent PWM current- mode feedback loops provide tight regulation and opera- tion free from subharmonic noise. The MAX742 can operate at 100kHz or 200kHz, so it can be used with small and lightweight external components. Also ripple and noise are easy to filter. The MAX742 provides a regulated output for inputs ranging from 4.2V to 10V (and higher with additional components). External power MOSFETs driven directly from the MAX742 are protected by cycle-by-cycle overcurrent sensing. The MAX742 also features undervoltage lockout, thermal shut- down, and programmable soft-start. If 3W of load power or less is needed, refer to the MAX743 data sheet for a device with internal power MOSFETs. ________________________Applications DC-DC Converter Module Replacement Distributed Power Systems Computer Peripherals ____________________________Features o Specs Guaranteed for In-Circuit Performance o Load Currents to ±2A o 4.2V to 10V Input-Voltage Range o Switches From ±15V to ±12V Under Logic Control o ±4% Output Tolerance Max Over Temp, Line, and Load o 90% Typ Efficiency o Low-Noise, Current-Mode Feedback o Cycle-by-Cycle Current Limiting o Undervoltage Lockout and Soft-Start o 100kHz or 200kHz Operation Switch-Mode Regulator with +5V to ±12V or ±15V Dual Output ________________________________________________________________ Maxim Integrated Products 1 MAX742 P R +5V INPUT S -SENSE -DRIVE PWM N R S +SENSE +DRIVE -VO +VO PWM OSC +2.0V VREF CC+ CC- __________Simplified Block Diagram 20 19 18 17 16 15 14 13 1 2 3 4 5 6 7 8 CSH+ CSL+ GND EXT+ AV AGND CC+ FB+ TOP VIEW PUMP PDRV EXT- V+ SS VREF 12/15 100/200 12 11 9 10 CSH- CSL- FB- CC- DIP/SO MAX742 __________________Pin Configuration 19-3105; Rev 2; 8/96 PART MAX742CPP MAX742CWP MAX742C/D 0°C to +70°C 0°C to +70°C 0°C to +70°C TEMP. RANGE PIN-PACKAGE 20 Plastic DIP 20 Wide SO Dice* EVALUATION KIT MANUAL FOLLOWS DATA SHEET MAX742EWP MAX742MJP -55°C to +125°C -40°C to +85°C 20 Wide SO 20 CERDIP MAX742EPP -40°C to +85°C 20 Plastic DIP ______________Ordering Information * Contact factory for dice specifications For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800 |
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