Description
The SC508/SC508A is a synchronous EcoSpeed®buck regulator which incorporates Semtech’s advanced, patented adaptive `on-time control architecture to provide excellent light-load efficiency and fast transient response. It features an integrated bootstrap switch and a fixed 5V LDO in a 3 x 3(mm) package. The device is highly efficient and uses minimal PCB area. The SC508A is available for automotive applications and is qualified to AEC-Q100.

Features
■ Power system
 • Input voltage — 4.5V to 46V
 • Integrated bootstrap switch
 • Fixed 5V LDO output — 200mA
 • 1% reference tolerance -40 to +85 °C
 • Selectable internal/external bias power supply
 • EcoSpeed® architecture with pseudo-fixed frequency adaptive on-time control

■ Logic input and output control
 • Independent control EN for LDO and switcher
 • Programmable soft-start time
 • Programmable VIN UVLO threshold
 • Power Good output
 • Selectable power-save mode
 • Programmable ultrasonic power-save mode

■ Protections
 • Automatic restart on fault shutdown
 • Over-voltage and under-voltage
 • TC compensated RDS(ON) sensed current limit
 • Thermal shutdown
 • Smart power-save
 • Pre-bias start-up

■ Capacitor types: SP, POSCAP, OSCON, and ceramic
■ Package — 3 x 3(mm), 20-pin MLPQ
■ Lead-free and halogen-free
■ RoHS and WEEE compliant
■ AEC-Q100 Qualified available in SC508A

Applications
■ Office automation and computing
■ Networking and telecommunication equipment
■ Point-of-load power supplies and module replacement
■ Automotive applications