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MAX1714AEEP

High-Speed Step-Down Controller for Notebook Computers

Maxim Integrated 

19-1536; Rev 2; 8/05

EVAALVUAAILTAIOBNLEKIT

High-Speed Step-Down Controller

for Notebook Computers

General Description

The MAX1714 pulse-width modulation (PWM) controller

provides the high efficiency, excellent transient

response, and high DC output accuracy needed for

stepping down high-voltage batteries to generate low-

voltage CPU core or chip-set/RAM supplies in notebook

computers.

Maxim’s proprietary Quick-PWM™ quick-response,

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.

The MAX1714 achieves high efficiency at a reduced

cost by eliminating the current-sense resistor found in

traditional current-mode PWMs. Efficiency is further

enhanced by an ability to drive very large synchronous-

rectifier MOSFETs.

Single-stage buck conversion allows these devices to

directly step down high-voltage batteries for the highest

possible efficiency. Alternatively, two-stage conversion

(stepping down the +5V system supply instead of the

battery) at a higher switching frequency allows the mini-

mum possible physical size.

The MAX1714 is intended for CPU core, chipset,

DRAM, or other low-voltage supplies as low as 1V. The

MAX1714A is available in a 20-pin QSOP package and

includes overvoltage protection. The MAX1714B is

available in a 16-pin QSOP package with no overvolt-

age protection. For applications requiring VID compli-

ance or DAC control of output voltage, refer to the

MAX1710/MAX1711 data sheet. For a dual output ver-

sion, refer to the MAX1715† data sheet.

Applications

Notebook Computers

CPU Core Supply

Chipset/RAM Supply as Low as 1V

1.8V and 2.5V I/O Supply

Quick-PWM is a trademark of Maxim Integrated Products.

† Future product—contact factory for availability.

Pin Configurations appear at end of data sheet.

Features

♦ Ultra-High Efficiency

♦ No Current-Sense Resistor (Lossless ILIMIT)

♦ Quick-PWM with 100ns Load-Step Response

♦ 1% VOUT Accuracy Over Line and Load

♦ 2.5V/3.3V Fixed or 1V to 5.5V Adjustable Output

Range

♦ 2V to 28V Battery Input Range

♦ 200/300/450/600kHz Switching Frequency

♦ Overvoltage Protection (MAX1714A)

♦ Undervoltage Protection

♦ 1.7ms Digital Soft-Start

♦ Drives Large Synchronous-Rectifier FETs

♦ 2V ±1% Reference Output

♦ Power-Good Indicator

Ordering Information

PART

TEMP RANGE

MAX1714AEEP

-40°C to +85°C

MAX1714AEEP+ -40°C to +85°C

MAX1714BEEE

-40°C to +85°C

MAX1714BEEE+ -40°C to +85°C

+Denotes lead-free package.

PIN-PACKAGE

20 QSOP

20 QSOP

16 QSOP

16 QSOP

+5V INPUT

Minimal Operating Circuit

BATTERY

4.5V TO 28V

VCC

VDD

SHDN V+

ILIM

BST

DH

MAX1714

LX

REF

DL

PGOOD PGND

(GND)

FB

OUT

SKIP

AGND

(GND)

OUTPUT

1.25V TO 2V

( ) ARE FOR THE MAX1714B ONLY.

________________________________________________________________ Maxim Integrated Products 1

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.

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