Description

The SC1480A is a single output, constant on-time synchronous-buck, pseudo-fixed frequency, PWM controller intended for use in notebook computers and other battery operated portable devices. Features include high efficiency and fast dynamic response with no minimum on time, a reference input and a buffered REFOUT pin capable of sourcing 3mA. The excellent transient response means that SC1480 based solutions will require less output capacitance than competing fixed frequency converters.

Features

◆ Compatible with DDR & DDR2 memory power requirements

◆ Constant on-time for fast dynamic response

◆ Programmable VOUT based on external reference

◆ VIN range = 1.8V – 25V

◆ DC current sense using low-side RDS(ON) sensing or sense resistor

◆ 3mA reference output buffer

◆ Low power S3 state

◆ Resistor programmable frequency

◆ Cycle-by-cycle current limit

◆ Digital soft start

◆ Output current source-sink capability

◆ Overvoltage/under-voltage fault protection and PGOOD output

◆ Under 10uA typical shutdown current

◆ Low quiescent power dissipation

◆ 14 Lead TSSOP

◆ Industrial temperature range

◆ Integrated gate drivers with soft switching

◆ Efficiency >80

Applications

◆ Notebook computers

◆ CPU I/O supplies

◆ Handheld terminals and PDAs

◆ LCD monitors

◆ Network power supplies