Datasheet > RT6551A

RT6551A

更新时间： 2024-11-22 16:37:07

品牌	Logo	应用领域
立锜 - RICHTEK		双倍数据速率
页数	文件大小	规格书
23页	284K
描述
Complete DDR Memory Power Supply Controller

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RT6551A 数据手册

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

1.5Asink/source tracking linear regulator and buffered low

noise reference.

RT6551A/B supports all of the sleep state controls placing

VTT at high-Z in S3 and discharging VDDQ, VTT and

VTTREF (soft-off) in S4/S5.

The RT6551A/B provides protections including OVP, UVP,

and thermal shutdown. The RT6551A/B is available in the

WQFN-20L 3x3 package.

The PWM controller provides the low quiescent current,

high efficiency, excellent transient response, and highDC

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.

Applications

 DDR2/DDR3/DDR3L/LPDDR3/DDR4 Memory Power

Supplies

 Notebook computers

 SSTL18, SSTL15 and HSTL bus termination

Pin Configurations

The RT6551A/B achieves high efficiency at a reduced cost

by eliminating the current-sense resistor found in

traditional current mode PWMs. Efficiency is further

enhanced by its ability to drive very large synchronous

rectifier MOSFETs. The Buck conversion allows this device

to directly step down high-voltage batteries for the highest

possible efficiency.

(TOP VIEW)

20 19 18 17 16

VTTGND

VTTSNS

GND

VTTREF

VDDQ

LGATE

PGND

VDD

VID

GND

9 10

The 1.5A sink/source LDO maintains fast transient

response only requiring a 10μF ceramic output capacitor.

In addition, the LDO supply input is available externally

to significantly reduce the total power losses. The

WQFN-20L 3x3

Simplified Application Circuit

VDD

TON

VDD

RT6551A/B

UGATE

BOOT

PGOOD

VTT

PHASE

LGATE

VDDQ

VTTSNS

VTTREF

VDDQ

VID

VLDOIN

GND

is a registered trademark of Richtek Technology Corporation.

DS6551A/B-00 May 2015

www.richtek.com

12 3 4 5 6 7...23

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与RT6551A相关器件

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RT6575D	RICHTEK	获取价格	暂无描述
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RT6576A	RICHTEK	获取价格	暂无描述
RT6576B	RICHTEK	获取价格	暂无描述
RT6576C	RICHTEK	获取价格	暂无描述