Description

The SC483 is a dual output constant-on synchronous buck PWM controller intended for use in notebook computers and other battery operated portable devices. Features include high efficiency and a fast dynamic response with no minimum on time. The excellent transient response means that SC483 based solutions will require less output capacitance than competing fixed frequency converters.

Features

◆ Constant on-time for fast dynamic response

◆ Programmable VOUT range = 0.5 – VCCA

◆ VBAT Range = 1.8V – 25V

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

◆ Resistor programmable frequency

◆ Cycle-by-cycle current limit

◆ Digital soft-start

◆ Separate PSAVE option for each switcher

◆ Over-voltage/Under-voltage fault protection

◆ 10µA Typical shutdown current

◆ Low quiescent power dissipation

◆ Two Power Good indicators

◆ 1 Reference (2 system DC accuracy)

◆ Integrated gate drivers with soft switching

◆ Separate enables

◆ 28 Lead TSSOP

◆ Industrial temperature range

◆ Output soft discharge upon shutdown

Applications

◆ Notebook computers

◆ CPT I/O supplies

◆ Handheld terminals and PDAs

◆ LCD monitors

◆ Network power supplies