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