MAX1627 Datasheet | Maxim Integrated

Description The MAX1626/MAX1627 step-down DC-DC switching controllers provide high efficiency over loads ranging from 1m A to more than 2A. A unique current-limited, pulse-frequency-modulated (PFM) control scheme operates with up to a 100% duty cycle, resulting in very low dropout voltages. This control scheme eliminates minimum load requirements and reduces the supply current under light loads to 90µA (versus 2m A to 10m A for mon pulse-width modulation controllers). These step-down controllers drive an external P-channel MOSFET, allowing design flexibility for applications to 12W or higher. Soft-start reduces current surges during start-up. A high switching frequency (up to 300k Hz) and operation in continuous-conduction mode allow the use of tiny surface-mount inductors. Output capacitor requirements are also reduced, minimizing PC board area and system costs. The output voltage is preset at 5V or 3.3V for the MAX1626 and adjustable for the MAX1627. Input voltages can be up to 16.5V. The MAX1626/MAX1627 are functional upgrades for the MAX1649/MAX1651. MAX1626/MAX1627 ______________Ordering Information PART MAX1626C/D MAX1626ESA MAX1627C/D MAX1627ESA TEMP. RANGE 0°C to +70°C -40°C to +85°C 0°C to +70°C -40°C to +85°C PIN-PACKAGE Dice- 8 SO Dice- 8 SO ________________________Applications PCMCIA Power Supplies Personal Digital Assistants Hand-Held puters Portable Terminals Low-Cost Notebook puter Supplies 5V to 3.3V Green PC Applications High-Efficiency Step-Down Regulation Minimum-ponent DC-DC Converters Battery-Powered Applications - Dice are tested at TA = +25°C. __________Typical Operating Circuit INPUT 3.3V to 16.5V __________________Pin Configuration V+ TOP VIEW MAX1626 OUT 3/5 (FB) 1 2 8 7 GND EXT CS V+ 3/5 REF GND OUT ON/OFF SHDN CS EXT P OUTPUT 3.3V SHDN 3 REF 4 MAX1626 MAX1627 6 5 ( ) ARE FOR MAX1627 ________________________________________________________________ Maxim Integrated Products For free samples & the latest literature:...