MAX1652 Maxim, MAX1652 Datasheet

MAX1652

Manufacturer Part Number

MAX1652

Description

High-Efficiency / PWM / Step-Down DC-DC Controllers in 16-Pin QSOP

Manufacturer

Maxim

Datasheet

1.MAX1652.pdf (28 pages)

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The MAX1652–MAX1655 are high-efficiency, pulse-

width-modulated (PWM), step-down DC-DC controllers

in small QSOP packages. The MAX1653/MAX1655 also

come in 16-pin narrow SO packages that are pin-

compatible upgrades to the popular MAX797. Improve-

ments include higher duty-cycle operation for better

dropout, lower quiescent supply currents for better

light-load efficiency, and an output voltage down to 1V

(MAX1655).

The MAX1652–MAX1655 achieve up to 96% efficiency

and deliver up to 10A using a unique Idle Mode™ syn-

chronous-rectified PWM control scheme. These devices

automatically switch between PWM operation at heavy

loads and pulse-frequency-modulated (PFM) operation

at light loads to optimize efficiency over the entire out-

put current range. The MAX1653/MAX1655 also feature

logic-controlled, forced PWM operation for noise-sensi-

tive applications.

All devices operate with a selectable 150kHz/300kHz

switching frequency, which can also be synchronized

to an external clock signal. Both external power switch-

es are inexpensive N-channel MOSFETs, which provide

low resistance while saving space and reducing cost.

The MAX1652 and MAX1654 have an additional feed-

back pin that permits regulation of a low-cost second

output tapped from a transformer winding. The

MAX1652 provides an additional positive output. The

MAX1654 provides an additional negative output.

The MAX1652–MAX1655 have a 4.5V to 30V input volt-

age range. The MAX1652/MAX1653/MAX1654’s output

range is 2.5V to 5.5V while the MAX1655’s output range

extends down to 1V. An evaluation kit (MAX1653EVKIT)

is available to speed designs.

19-1357; Rev 1; 7/98

Pin Configurations appear at end of data sheet.

Idle Mode is a trademark of Maxim Integrated Products.

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.

For small orders, phone 408-737-7600 ext. 3468.

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________________________________________________________________ Maxim Integrated Products

General Description

DC-DC Controllers in 16-Pin QSOP

Applications

High-Efficiency, PWM, Step-Down

____________________________Features

MAX1652

MAX1653

MAX1654

MAX1655

MAX1652EEE

MAX1653ESE

MAX1653EEE

MAX1654EEE

MAX1655ESE

MAX1655EEE

96% Efficiency

Small, 16-Pin QSOP Package

(half the size of a 16-pin narrow SO)

Pin-Compatible with MAX797 (MAX1653/MAX1655)

Output Voltage Down to 1V (MAX1655)

4.5V to 30V Input Range

99% Duty Cycle for Lower Dropout

170µA Quiescent Supply Current

3µA Logic-Controlled Shutdown

Dual, N-Channel, Synchronous-Rectified Control

Fixed 150kHz/300kHz PWM Switching,

or Synchronized from 190kHz to 340kHz

Programmable Soft Start

Low-Cost Secondary Outputs (MAX1652/MAX1654)

PART

VOLTAGE (V)

FEEDBACK

2.5

-40°C to +85°C

TEMP. RANGE

Ordering Information

Regulates positive

secondary voltage

(such as +12V)

Logic-controlled,

low-noise mode

Regulates negative

secondary voltage

(such as -5V)

Low output volt-

ages (1V to 5.5V);

logic-controlled,

low-noise mode

FEATURE

SPECIAL

Selection Guide

16 QSOP

16 Narrow SO

16 QSOP

16 Narrow SO

16 QSOP

PIN-PACKAGE

COMPATIBILITY

Same pin order

as MAX796, but

smaller package

Pin-compatible

with MAX797

Same pin order

as MAX799, but

smaller package

Pin compatible

with MAX797

(except for feed-

back voltage)

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