MAX1999 Maxim Integrated Products, MAX1999 Datasheet

MAX1999

Manufacturer Part Number

MAX1999

Description

Manufacturer

Maxim Integrated Products

Datasheets

1.MAX1999.pdf (32 pages)

2.MAX1999.pdf (32 pages)

3.MAX1999.pdf (32 pages)

Specifications of MAX1999

Case

SSOP

Date_code

0236+

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Current page: 1 of 32
Download datasheet (498Kb)

The MAX1777/MAX1977/MAX1999 dual step-down,

switch-mode power-supply (SMPS) controllers generate

logic-supply voltages in battery-powered systems. The

MAX1777/MAX1977/MAX1999 include two pulse-width

modulation (PWM) controllers, adjustable from 2V to 5.5V

or fixed at 5V and 3.3V. These devices feature two linear

regulators providing 5V and 3.3V always-on outputs.

Each linear regulator provides up to 100mA output cur-

rent with automatic linear regulator bootstrapping to the

main SMPS outputs. The MAX1777/MAX1977/MAX1999

include on-board power-up sequencing, a power-good

(PGOOD) output, digital soft-start, and internal soft-stop

output discharge that prevents negative voltages on shut-

down.

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

stant on-time PWM control scheme operates without

sense resistors and provides 100ns response to load

transients while maintaining a relatively constant switch-

ing frequency. The unique ultrasonic pulse-skipping

mode maintains the switching frequency above 25kHz,

which eliminates noise in audio applications. Other fea-

tures include pulse skipping, which maximizes efficiency

in light-load applications, and fixed-frequency PWM

mode, which reduces RF interference in sensitive appli-

cations.

The MAX1777 features a 200kHz/5V and 300kHz/3.3V

SMPS for highest efficiency, while the MAX1977 features

a 400kHz/5V and 500kHz/3.3V SMPS for “thin and light”

applications. The MAX1999 provides a pin-selectable

switching frequency, allowing either 200kHz/300kHz or

400kHz/500kHz operation of the 5V/3.3V SMPSs, respec-

tively. The MAX1777/MAX1977/MAX1999 are available in

28-pin QSOP packages and operate over the extended

temperature range (-40°C to +85°C). The MAX1777/

MAX1977/MAX1999 are available in lead-free packages.

19-2187; Rev 1; 9/04

Quick-PWM and Dual Mode are trademarks of Maxim

Integrated Products, Inc.

Pin Configurations continued at end of data sheet.

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.

Notebook and Subnotebook Computers

PDAs and Mobile Communication Devices

3- and 4-Cell Li+ Battery-Powered Devices

Supply Controllers for Notebook Computers

High-Efficiency, Quad Output, Main Power-

________________________________________________________________ Maxim Integrated Products

General Description

Applications

♦ No Current-Sense Resistor Needed (MAX1999)

♦ Accurate Current Sense with Current-Sense

♦ 1.5% Output Voltage Accuracy

♦ 3.3V and 5V 100mA Bootstrapped Linear

♦ Internal Soft-Start and Soft-Stop Output

♦ Quick-PWM with 100ns Load Step Response

♦ 3.3V and 5V Fixed or Adjustable Outputs

♦ 4.5V to 24V Input Voltage Range

♦ Ultrasonic Pulse-Skipping Mode (25kHz min)

♦ Power-Good (PGOOD) Signal

♦ Overvoltage Protection Enable/Disable

+Denotes lead-free package.

MAX1777EEI

MAX1777EEI+ -40°C to +85°C 28 QSOP

MAX1977EEI

MAX1977EEI+ -40°C to +85°C 28 QSOP

MAX1999EEI

MAX1999EEI+ -40°C to +85°C 28 QSOP

Resistor (MAX1777/MAX1977)

Regulators

Discharge

(Dual Mode™)

PART

TOP VIEW

TEMP RANGE

-40°C to +85°C 28 QSOP

PGOOD

SHDN

ILIM3

ILIM5

BST5

SKIP

N.C.

ON3

ON5

PRO

TON

FB3

REF

FB5

Ordering Information

Pin Configurations

MAX1999

QSOP

PIN-

PACKAGE

BST3

LX3

DH3

LDO3

DL3

GND

OUT3

OUT5

V+

DL5

LDO5

DH5

LX5

200kH z/300kH z

400kH z/500kH z

200kH z/300kH z or

400kH z/500kH z

200kH z/300kH z or

400kH z/500kH z

Features

FREQUENCY

SWITCHING

5V/3V

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