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MAX1715

Ultra-High Efficiency, Dual Step-Down Controller for Notebook Computers

Maxim Integrated 

19-1541; Rev 2; 8/05

EVAALVUAAILTAIOBNLEKIT

Ultra-High Efficiency, Dual Step-Down

Controller for Notebook Computers

General Description

The MAX1715 PWM controller provides the high effi-

ciency, excellent transient response, and high DC out-

put accuracy needed for stepping down high-voltage

batteries to generate low-voltage CPU core, I/O, and

chipset 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 MAX1715 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.

Single-stage buck conversion allows this device 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 MAX1715 is intended for CPU core, chipset,

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

MAX1715 is available in a 28-pin QSOP package. For

applications requiring VID compliance or DAC control

of output voltage, refer to the MAX1710/MAX1711 data

sheet. For a single-output version, refer to the MAX1714

data sheet.

Applications

Notebook Computers

CPU Core Supply

Chipset/RAM Supply as Low as 1V

1.8V and 2.5V I/O Supply

Pin Configuration appears 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

♦ Dual-Mode Fixed 1.8V/3.3V/Adj or 2.5V/Adj Outputs

♦ Adjustable 1V to 5.5V Output Range

♦ 2V to 28V Battery Input Range

♦ 200/300/420/540kHz Nominal Switching Frequency

♦ Over/Undervoltage Protection

♦ 1.7ms Digital Soft-Start

♦ Drives Large Synchronous-Rectifier FETs

♦ Power-Good Indicator

Ordering Information

PART

MAX1715EEI

MAX1715EEI+

TEMP RANGE

-40°C to +85°C

-40°C to +85°C

+ Denotes lead-free package.

PIN-PACKAGE

28 QSOP

28 QSOP

5V INPUT

OUTPUT1

1.8V

Minimal Operating Circuit

VDD

V+

VCC

ILIM1

ILIM2

ON1

ON2

BST1 BST2

DH1 DH2

LX1

LX2

DL1

DL2

TON PGND

OUT1 OUT2

PGOOD

REF

SKIP

FB1 AGND FB2

BATTERY

4.5V TO 28V

MAX1715

OUTPUT2

2.5V

Quick-PWM is a trademark of Maxim Integrated Products.

________________________________________________________________ Maxim Integrated Products 1

For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

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