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Description

The SC403B is a stand-alone synchronous EcoSpeed? buck power supply which incorporates Semtech’s advanced patented adaptive on-time control architecture. It provides 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 5.5V

Reference Voltage — 600mV

Integrated bootstrap switch

Programmable LDO output — 200mA

1 reference tolerance -40 to +85 °C

EcoSpeed? 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 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

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