Description

The SC403 is a stand-alone synchronous EcoSpeedTM buck power supply which incorporates Semtech’s advanced patent-pending adaptive on-time control architecture to provide excellent light-load efficiency and fast transient response. It features integrated power MOSFETs, a boot strap switch, and a programmable LDO in a 5x5mm package. The device is highly efficient and uses minimal PCB area.

Features

Power System:

   Input voltage — 3V to 28V

   Internal or external bias voltage — 3V to 5V

   Integrated bootstrap switch

   Programmable LDO output — 200mA

   1% reference tolerance -40 to +85 °C

   EcoSpeedTM architecture with pseudo-fixed frequency adaptive on-time control

Logic Input/Output Control:

   Independent control EN for LDO and switcher

   Programmable VIN UVLO threshold

   Power good output

   Selectable ultrasonic power save mode

   Programmable soft start time

Protections:

   Over-voltage and under-voltage

   TC compensated RDS(ON) sensed current limit

   Thermal shutdown

Any ESR — SP, POSCAP, OSCON, and ceramic capacitors

Package:

   Lead-free package — 5x5mm, 32-pin MLPQ

   Fully RoHS/WEEE compliant and halogen free



Applications

Office automation and computing

Networking and telecommunication equipment

Point of load power supplies and module replacement