Description

The SC1480ITSTRT is a single output, constant on-time synchronous-buck, pseudo-fixed frequency, PWM controller used in notebook computers and other battery-operated portable devices. Its excellent transient response means that it requires less output capacitance than competing fixed frequency converters. Features include high efficiency, fast dynamic response, and a reference input with a buffered REFOUT pin capable of sourcing 3mA.

Specifications and features

Features:

• 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-Pin TSSOP package. Also available in Lead-free package which is fully WEEE and RoHS compliant
• Industrial temperature range
• Integrated gate drivers with soft switching
• Efficiency >90%

Application Scenarios

The SC1480ITSTRT is typically used in the following applications:

• Notebook computers
• CPU I/O supplies
• Handheld terminals and PDAs
• LCD monitors
• Network power supplies

Comparison

• Fast dynamic response
• Programmable VOUT based on external reference
• Integrated gate drivers with soft switching
• Low quiescent power dissipation
• Efficiency >90%

• None identified