Description
The SC419 is a synchronous buck power supply controller. It features a bootstrap switch in a space-saving MLPQ- 3 x 3mm 20-pin package. The device is highly efficient and uses minimal PCB area. It uses pseudo-fixed frequency adaptive on-time operation to provide fast transient response.
The SC419 supports using standard capacitor types such as electrolytic or special polymer in addition to ceramic, at switching frequencies up to 1MHz. The programmable frequency, synchronous operation, and programmable power-save provide high efficiency operation over a wide load range.

Features
■ Power system
   • Input voltage — 3V to 28V
   • Integrated bootstrap switch
   • 1% reference tolerance -40 to +85 °C
   • EcoSpeedTM architecture with pseudo-fixed 
      frequency adaptive on-time control
   • Internal soft-start and soft-shutdown at output
   • SmartDriveTM
■ Logic input/output control
   • Independent control EN for LDO and switcher
   • Programmable VIN UVLO threshold
   • Power good output
   • Selectable power save mode
   • Programmable ultrasonic power save mode
■ Protections
   • Over-voltage/under-voltage
   • TC compensated RDS(ON) sensed current limit
   • Thermal shutdown
   • Smart power save
■ Output capacitor types
   • High ESR — SP, POSCAP, OSCON
   • Ceramic capacitors
■ Package — 3 x 3mm, 20-pin MLPQ
■ Lead-free and halogen free
■ RoHS and WEEE compliant

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