RT6551B - Complete DDR Memory Power Supply Controller

This page provides the datasheet information for the RT6551B, a member of the RT6551A Complete DDR Memory Power Supply Controller family.

Description

The RT6551A/B provides a complete power supply for DDR2/DDR3/DDR3L/LPDDR3/DDR4 memory systems.

It integrates a synchronous PWM Buck controller with a 1.5A sink/source tracking linear regulator and buffered low noise reference.

Features

PWM Controller  Adjustable Current Limit with Low-Side RDS(ON) Sensing  Low Quiescent Supply Current  Quick Load-Step Response within 100ns  1% VVDDQ Accuracy Over Line and Load  Adjustable 0.675V to 3.3V Output Range for 1.8V (DDR2), 1.5V (DDR3), 1.35V (DDR3L), 1.2V (LPDDR3) and 1.2V (DDR4)  4.5V to 26V Battery Input Range  Resistor Adjustable Frequency  Over-/Under-Voltage Protection  Internal Voltage Ramp Soft-Start  Drives Large Synchronous Rectifier MOSFETs  Power Good Indi.

Richtek

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Datasheet Details

Part number	RT6551B
Manufacturer	Richtek
File Size	284.16 KB
Description	Complete DDR Memory Power Supply Controller
Datasheet	RT6551B Datasheet
Additional preview pages of the RT6551B datasheet.

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Full PDF Text Transcription

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® RT6551A/B Complete DDR Memory Power Supply Controller General Description The RT6551A/B provides a complete power supply for DDR2/DDR3/DDR3L/LPDDR3/DDR4 memory systems. It integrates a synchronous PWM Buck controller with a 1.5A sink/source tracking linear regulator and buffered low noise reference. The PWM controller provides the low quiescent current, high efficiency, excellent transient response, and high DC output accuracy needed for stepping down high-voltage batteries to generate low-voltage 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.

Published: Dec 25, 2024 |