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