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RT9221 - PROGRAMMABLE SYNCHRONOUS PWM BUCK CONVERTER

General Description

The RT9221 integrates a PWM controller and two low-dropout linear regulators into a single chip.

The PWM controller provides the CPU core voltage controlled by a 5-bit DAC and the linear section regulates power for GTL bus, clock driver or other circuits on motherboards.

Key Features

  • z Provides 3 Regulated Voltages z N-MOSFET Driver for High Efficiency Switching Section z Power-good, Over-voltage, and Current- limiting Protection for Switching Section z 1.5V and 2.5V Fixed Output Voltage for Linear Section z Linear Section Uses Low Cost NPN Transistor as Power Device z TTL-compatible 5-bit DAC Core Output Voltage.

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Datasheet Details

Part number RT9221
Manufacturer Richtek Technology
File Size 150.35 KB
Description PROGRAMMABLE SYNCHRONOUS PWM BUCK CONVERTER
Datasheet download datasheet RT9221 Datasheet

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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RT9221 Programmable Synchronous PWM Buck Converter with 1.5V/2.5V Dual Low Dropout Linear Regulator Controller General Description The RT9221 integrates a PWM controller and two low-dropout linear regulators into a single chip. The PWM controller provides the CPU core voltage controlled by a 5-bit DAC and the linear section regulates power for GTL bus, clock driver or other circuits on motherboards. The PWM controller provides an adjustable Intel-compatible 1.3V~3.5V output voltage. The synchronous N-MOSFET driver with 200 KHz switching frequency optimizes the efficiency, device size, and cost built-in over–voltage and current-limiting protection prevent the CPU from damage. Power-good signal is sent when the core voltage is within ±10% of the setting point.