MAX8550 Maxim Integrated Products, MAX8550 Datasheet

MAX8550

Manufacturer Part Number

MAX8550

Description

(MAX8550 / MAX8551) Integrated DDR Power-Supply Solutions

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX8550.pdf (29 pages)

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The MAX8550/MAX8551 integrate a synchronous-buck

PWM controller to generate V

LDO linear regulator to generate V

ence output buffer to generate V

drives two external N-channel MOSFETs to generate out-

put voltages down to 0.7V from a 2V to 28V input with out-

put currents up to 15A. The LDO can sink or source up to

1.5A continuous and 3A peak current. Both the LDO out-

put and the 10mA reference buffer output can be made

to track the REFIN voltage. These features make the

MAX8550/MAX8551 ideally suited for DDR memory appli-

cations in desktops, notebooks, and graphic cards.

The PWM controller in the MAX8550/MAX8551 utilizes

Maxim’s proprietary Quick-PWM™ architecture with pro-

grammable switching frequencies of up to 600kHz. This

control scheme handles wide input/output voltage ratios

with ease and provides 100ns response to load tran-

sients while maintaining high efficiency and a relatively

constant switching frequency. The MAX8550 offers fully

programmable UVP/OVP and skip-mode options ideal in

portable applications. Skip mode allows for improved

efficiency at lighter loads. The MAX8551, which is tar-

geted towards desktop and graphic-card applications,

does not offer the pulse-skip feature.

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

The high bandwidth of this LDO regulator allows excel-

lent transient response without the need for bulk capac-

itors, thus reducing cost and size.

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 MOS-

FET. Additionally, overvoltage and undervoltage

protection 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 MAX8550/MAX8551

allow flexible sequencing and standby power manage-

ment using the SHDNA, SHDNB, and STBY inputs.

Both the MAX8550 and MAX8551 are available in a

small 5mm × 5mm, 28-pin thin QFN package.

19-3173; Rev 2; 9/04

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.

DDR I and DDR II Memory Power Supplies

Desktop Computers

Notebooks and Desknotes

Graphic Cards

Game Consoles

RAID

Networking

Integrated DDR Power-Supply Solutions for

Desktops, Notebooks, and Graphic Cards

________________________________________________________________ Maxim Integrated Products

General Description

DDQ

TTR

, a sourcing and sinking

. The buck controller

Applications

, and a 10mA refer-

REFIN

/ 2.

Buck Controller

♦ Quick-PWM with 100ns Load-Step Response

♦ Up to 95% Efficiency

♦ 2V to 28V Input Voltage Range

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

♦ Up to 600kHz Selectable Switching Frequency

♦ Programmable Current Limit with Foldback

♦ 1.7ms Digital Soft-Start and Independent

♦ Overvoltage/Undervoltage-Protection Option

♦ Power-Good Window Comparator

LDO Section

♦ Fully Integrated VTT and VTTR Capability

♦ VTT has ±3A Sourcing/Sinking Capability

♦ VTT and VTTR Outputs Track V

♦ All-Ceramic Output-Capacitor Designs

♦ 1.0V to 2.8V Input Voltage Range

♦ Power-Good Window Comparator

+Denotes lead-free package.

Typical Operating Circuit appears at end of data sheet.

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

MAX8550ETI

MAX8550ETI+

MAX8551ETI

Capability

Shutdown

PART

MAX8551)

(N.C. FOR

OVP/UVP

TOP VIEW

POK1

POK2

STBY

ILIM

TON

REF

-40°C to +85°C

TEMP RANGE

5mm x 5mm Thin QFN

Ordering Information

MAX8550

MAX8551

Pin Configuration

PIN-PACKAGE

28 5mm × 5mm TQFN

REFIN

Features

/ 2

BST

OUT

Datasheet pdf - http://www.DataSheet4U.net/

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