MAX8632ETI Maxim Integrated Products, MAX8632ETI Datasheet

MAX8632ETI

Manufacturer Part Number

MAX8632ETI

Description

Manufacturer

Maxim Integrated Products

Datasheets

1.MAX8632ETIT.pdf (29 pages)

2.MAX8632ETI.pdf (29 pages)

3.MAX8632ETI.pdf (29 pages)

Specifications of MAX8632ETI

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Current page: 1 of 29
Download datasheet (512Kb)

The MAX8632 integrates a synchronous-buck PWM con-

troller to generate V

ear regulator to generate V

output buffer to generate V

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

MAX8632 ideally suited for DDR memory applications in

desktops, notebooks, and graphic cards.

The PWM controller in the MAX8632 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 MAX8632 offers fully pro-

grammable UVP/OVP and skip-mode options ideal in

portable applications. Skip mode allows for improved

efficiency at lighter loads.

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

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 MAX8632 allows flex-

ible sequencing and standby power management using

the SHDN and STBY inputs, which support all DDR

operating states.

The MAX8632 is available in a small 5mm × 5mm, 28-

pin thin QFN package.

19-3623; Rev 0; 3/05

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

for Desktops, Notebooks, and Graphic Cards

________________________________________________________________ Maxim Integrated Products

DDQ

, a sourcing and sinking LDO lin-

General Description

TTR

Integrated DDR Power-Supply Solution

. The buck controller drives

, and a 10mA reference

Applications

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

♦ Independent Shutdown and Standby Controls

♦ Overvoltage-/Undervoltage-Protection Option

♦ Power-Good Window Comparator

♦ Fully Integrated VTT and VTTR Capability

♦ VTT Has ±3A Sourcing/Sinking Capability

♦ Only 20µF Ceramic Capacitance Required for VTT

♦ 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 packaging.

MAX8632ETI+

Typical Operating Circuit appears at end of data sheet.

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

Capability

LDO Section

TOP VIEW

PART

PGND1

GND

TPO

-40°C to +85°C 28 Thin QFN 5mm × 5mm

TEMP RANGE PIN-PACKAGE

5mm x 5mm THIN QFN

Ordering Information

MAX8632

Pin Configuration

REFIN

Features

/ 2

VTT

REFIN

VTTI

PGND2

VTTR

VTTS

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