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