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MAX746 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX746 Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 16 page _______________General Description The MAX746 is a high-efficiency, high-current, step-down DC-DC power-supply controller that drives external N-chan- nel FETs. It provides 93% to 96% efficiency from a 6V supply voltage with load currents ranging from 50mA up to 3A. It uses a pulse-width-modulating (PWM) current-mode control scheme to provide precise output regulation and low output noise. The MAX746's 4V to 15V input voltage range, fixed 5V/adjustable (Dual-ModeTM) output, and adjustable current limit make this device ideal for a wide range of applications. High efficiency is maintained with light loads due to a propri- etary automatic pulse-skipping control (Idle-ModeTM) scheme that minimizes switching losses by reducing the switching fre- quency at light loads. The low 950µA quiescent current and ultra-low 1.4µA shutdown current further extend battery life. External components are protected by the MAX746's cycle- by-cycle current limit. The MAX746 also features a 2V ±1.5% reference, a comparator for low-battery detection or level translating, and soft-start and shutdown capability. The MAX747—discussed in a separate data sheet— functions similarly to the MAX746, but drives P-channel logic level FETs. ________________________Applications 5V-to-3.3V Green PC Applications Notebook/Laptop Computers Personal Digital Assistants Battery-Operated Equipment Cellular Phones ____________________________Features o 93% to 96% Efficiency for 50mA to 3A Output Currents o 4V to 15V Input Voltage Range o Low 950µA Supply Current o 1.4µA Shutdown Current o Drives External N-Channel FETs o Fixed-Frequency Current-Mode PWM (Heavy Loads) o Idle-Mode PFM (Light Loads) o Cycle-by-Cycle Current Limiting o 2V ±1.5% Accurate Reference Output o Adjustable Soft-Start o Undervoltage Lockout o Precision Comparator for Power-Fail or Low-Battery Warning ______________Ordering Information * Contact factory for dice specifications. High-Efficiency, PWM, Step-Down, N-Channel DC-DC Controller ________________________________________________________________ Maxim Integrated Products 1 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 GND V+ CP HIGH REF SS LBI LBO TOP VIEW MAX746 EXT AGND CS OUT AV+ CC FB SHDN DIP/SO __________________Pin Configuration CP HIGH SHDN LBI REF EXT OUT V+ AV+ CS OUTPUT 5V LOW-BATTERY DETECTOR OUTPUT LBO GND AGND FB CC SS ON/OFF LOW-BATTERY DETECTOR INPUT INPUT 6V TO 15V 40m Ω 39 µH 440 µF MAX746 __________Typical Operating Circuit Call toll free 1-800-998-8800 for free samples or literature. PART TEMP. RANGE PIN-PACKAGE MAX746CPE 0°C to +70°C 16 Plastic DIP MAX746CSE 0°C to +70°C 16 Narrow SO MAX746C/D 0°C to +70°C Dice* MAX746MJE -55°C to +125°C 16 CERDIP MAX746ESE -40°C to +85°C 16 Narrow SO MAX746EPE -40°C to +85°C 16 Plastic DIP 19-0192; Rev 1; 11/93 ™Dual-Mode and Idle-Mode are trademarks of Maxim Integrated Products. |
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