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RT8204B Datasheet Single Synchronous Buck

Manufacturer: Richtek

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General Description

The RT8204B PWM controller provides the high efficiency, excellent transient response, and high DC output accuracy needed for stepping down high voltage batteries to generate low voltage CPU core, I/O, and chipset RAM supplies in notebook computers.

The constant-on-time PWM control scheme handles wide input/output voltage ratios with ease and provides 100ns “instant-on” response to load transients while maintaining a relatively constant switching frequency.

The RT8204B achieves high efficiency at a reduced cost by eliminating the current sense resistor found in traditional current mode PWMs.

Overview

RT8204B Single Synchronous Buck with LDO Controller General.

Key Features

  • z PWM Controller ` Ultra-High Efficiency ` Resistor Programmable Current Limit by Low Side RDS(ON) Sense (Lossless Limit) or Sense Resistor (High Accuracy) ` Quick Load Step Response within 100ns ` 1% VOUT Accuracy Over Line and Load ` Adjustable 0.75V to 3.3V Output Range ` 3V to 26V Battery Input Range ` Resistor Programmable Frequency ` Over/Under Voltage Protection ` 2 Steps Current Limit During Soft-Start ` Drives Large Synchronous-Rectifier FETs ` Power-Good Indicator z LDO Controller ` 1.

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