Datasheet > MAX8550A

MAX8550A

更新时间： 2024-10-02 14:58:19

品牌	Logo	应用领域
亚德诺 - ADI		双倍数据速率电脑
页数	文件大小	规格书
29页	535K
描述
集成DDR电源方案，适用于台式机、笔记本电脑及图形卡

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数据手册

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MAX8550A 数据手册

19-3313; Rev 0; 5/04

Integrated DDR Power-Supply Solution for

Desktops, Notebooks, and Graphic Cards

General Description

Features

Buck Controller

The MAX8550A integrates a synchronous-buck PWM

controller to generate V

, a sourcing and sinking LDO

DDQ

♦ Quick-PWM with 100ns Load-Step Response

♦ Up to 95% Efficiency

linear regulator to generate V , and a 10mA reference

output buffer to generate V . The buck controller drives

TTR

♦ 2V to 28V Input Voltage Range

two external n-channel MOSFETs to generate output volt-

ages down to 0.7V from a 2V to 28V input with output cur-

rents up to 15A. The LDO can sink or source up to 1.5A

continuous and 3A peak current. Both the LDO output

and the 10mA reference buffer output can be made to

track the REFIN voltage. These features make the

MAX8550A ideally suited for DDR memory applications in

desktops, notebooks, and graphic cards.

♦ 1.8V/2.5V Fixed or 0.7V to 5.5V Adjustable Output

♦ Up to 600kHz Selectable Switching Frequency

♦ Programmable Current Limit with Foldback

Capability

♦ 1.7ms Digital Soft-Start

♦ Independent Shutdown and Standby Controls

♦ Overvoltage/Undervoltage-Protection Option

The PWM controller in the MAX8550A utilizes Maxim’s

proprietary Quick-PWM™ architecture with programma-

ble switching frequencies of up to 600kHz. This control

scheme handles wide input/output voltage ratios with

ease and provides 100ns response to load transients

while maintaining high efficiency and a relatively con-

stant switching frequency. The MAX8550A offers fully

programmable UVP/OVP and skip-mode options ideal in

portable applications. Skip mode allows for improved

efficiency at lighter loads.

♦ Power-Good Window Comparator

LDO Section

♦ Fully Integrated VTT and VTTR Capability

♦ VTT Has 3A Sourcing/Sinking Capability

♦ VTT and VTTR Outputs Track V

/ 2

REFIN

♦ All-Ceramic Output-Capacitor Designs

♦ 1.0V to 2.8V Input Voltage Range

♦ Power-Good Window Comparator

The VTT and VTTR outputs track to within 1% of V

/ 2.

REFIN

The high bandwidth of this LDO regulator allows excel-

lent transient response without the need for bulk capac-

itors, thus reducing cost and size.

Ordering Information

The buck controller and LDO regulators are provided with

independent current limits. Adjustable lossless foldback

current limit for the buck regulator is achieved by monitor-

ing the drain-to-source voltage drop of the low-side

MOSFET. Additionally, overvoltage and undervoltage pro-

tection mechanisms are built in. Once the overcurrent

condition is removed, the regulator is allowed to enter

soft-start again. This helps minimize power dissipation

during a short-circuit condition. The MAX8550A allows

flexible sequencing and standby power management

using the SHDN and STBY inputs, which support all

DDRs’ operating states.

PART

TEMP RANGE

PIN-PACKAGE

MAX8550AETI

-40°C to +85°C

28 TQFN 5mm × 5mm

Pin Configuration

TOP VIEW

TON

21 DL

OVP/UVP

BST

REF

The MAX8550A is available in a small 5mm × 5mm, 28-

pin thin QFN package.

ILIM

18 DH

MAX8550A

POK1

POK2

STBY

Applications

DDR I and DDR II Memory Power Supplies

Desktop Computers

OUT

15 FB

Notebooks and Desknotes

Graphic Cards

Game Consoles

RAID

5mm x 5mm Thin QFN

Networking

Typical Operating Circuit appears at end of data sheet.

Quick-PWM is a trademark of Maxim Integrated Products, Inc.

________________________________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

12 3 4 5 6 7...29

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与MAX8550A相关器件

型号	品牌	获取价格	描述	数据表
MAX8550AETI	MAXIM	获取价格	Intergrated DDR Power-Solution for Desktops, Notebooks, and Graphi Bill
MAX8550AETI+T	MAXIM	获取价格	Switching Controller, Current-mode, BICMOS, 5 X 5 MM, 0.80 MM HEIGHT, MO220WHHD-1, TQFN-28
MAX8550AETI-T	MAXIM	获取价格	Switching Controller, Current-mode, BICMOS, 5 X 5 MM, 0.80 MM HEIGHT, MO220WHHD-1, TQFN-28
MAX8550ETI	MAXIM	获取价格	Integrated DDR Power-Supply Solutions for Desktops, Notebooks, and Graphic Cards
MAX8550ETI+	MAXIM	获取价格	Integrated DDR Power-Supply Solutions for Desktops, Notebooks, and Graphic Cards
MAX8550ETI+T	MAXIM	获取价格	Switching Controller, Current-mode, 6.5A, BICMOS, 5 X 5 MM, 0.80 MM HEIGHT, ROHS COMPLIANT
MAX8550ETI-T	MAXIM	获取价格	暂无描述
MAX8550EVKIT	MAXIM	获取价格	Evaluation Kit
MAX8550-MAX8551	MAXIM	获取价格	Integrated DDR Power-Supply Solutions for Desktops, Notebooks, and Graphic Cards
MAX8551	MAXIM	获取价格	Evaluation Kit

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