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Description

The SC401B is a stand-alone synchronous EcoSpeedTM buck power supply which incorporates Semtech’s advanced patented adaptive on-time control architecture. This provides excellent light-load efficiency and fast transient response. It features integrated power MOSFETs, a bootstrap switch, and a programmable LDO in a 5x5mm package. The device is highly efficient and uses minimal PCB area. The SC401B has the same package and pin configuration as the entire SC40xB series for compatibility.

Features

■ Power System

? Input voltage — 3V to 17V

? Bias voltage — 3V to 5.5V LDO or external

? Up to 96 peak efficiency

? Integrated bootstrap switch

? Programmable LDO output — 200mA

? Reference tolerance — 1 T

? J= -40 to +125 °C

? Programmable soft-start time

■ Logic Input/Output Control

? Independent EN controls for LDO and switcher

? Programmable VIN UVLO threshold

? Power good output

? Selectable PSAVE or FCM mode

■ Output Capacitor Types

? High ESR — SP, POSCAP, OSCON

? Ceramic capacitors

■ Package

? Lead-free package — 5x5mm, 32-Pin MLPQ

? RoHS/WEEE compliant and Halogen free

Applications

■ Networking and telecommunication equipment

■ Printers, DSL, and STB applications

■ Embedded systems and power supply modules

■ Point of load power supplies