MAX1537 Maxim Integrated Products, MAX1537 Datasheet

MAX1537

Manufacturer Part Number

MAX1537

Description

Main Power-Supply Controllers

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX1537.pdf (38 pages)

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The MAX1533/MAX1537 are dual step-down, switch-

mode power-supply (SMPS) controllers with synchro-

nous rectification, intended for main 5V/3.3V power

generation in battery-powered systems. Fixed-frequen-

cy operation with optimal interleaving minimizes input

ripple current from the lowest input voltages up to the

26V maximum input. Optimal 40/60 interleaving allows

the input voltage to go down to 8.3V before duty-cycle

overlap occurs, compared to 180° out-of-phase regula-

tors where the duty-cycle overlap occurs when the

input drops below 10V. Output current sensing pro-

vides accurate current limit using a sense resistor.

Alternatively, power dissipation can be reduced using

lossless inductor current sensing.

Internal 5V and 3.3V linear regulators power the

MAX1533/MAX1537 and their gate drivers, as well as

external keep-alive loads, up to a total of 100mA. When

the main PWM regulators are in regulation, automatic

bootstrap switches bypass the internal linear regulators,

providing currents up to 200mA from each linear output.

An additional 5V to 23V adjustable internal 150mA linear

regulator is typically used with a secondary winding to

provide a 12V supply.

The MAX1533/MAX1537 include on-board power-up

sequencing, a power-good (PGOOD) output, digital

soft-start, and internal soft-shutdown output discharge

that prevents negative voltages on shutdown. The

MAX1533 is available in a 32-pin 5mm x 5mm thin QFN

package, and the MAX1537 is available in a 36-pin

6mm x 6mm thin QFN package. The exposed backside

pad improves thermal characteristics for demanding

linear keep-alive applications.

19-3501; Rev 0; 11/04

+Denotes lead-free package.

Dual Mode is a trademark of Maxim Integrated Products, Inc.

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.

MAX1533ETJ

MAX1533ETJ+

MAX1537ETX

MAX1537ETX+

High-Efficiency, 5x Output, Main Power-Supply

PART

2 to 4 Li+ Cells Battery-Powered Devices

Notebook and Subnotebook Computers

PDAs and Mobile Communicators

-40°C to +85°C 32 Thin QFN 5mm x 5mm

-40°C to +85°C 36 Thin QFN 6mm x 6mm

TEMP RANGE

________________________________________________________________ Maxim Integrated Products

Ordering Information

General Description

Controllers for Notebook Computers

PIN-PACKAGE

Applications

♦ Fixed-Frequency, Current-Mode Control

♦ 40/60 Optimal Interleaving

♦ Accurate Differential Current-Sense Inputs

♦ Internal 5V and 3.3V Linear Regulators with

♦ Auxiliary 12V or Adjustable 150mA Linear

♦ Dual-Mode™ Feedback—3.3V/5V Fixed or

♦ 200kHz/300kHz/500kHz Switching Frequency

♦ Versatile Power-Up Sequencing

♦ Adjustable Overvoltage and Undervoltage

♦ 6V to 26V Input Range

♦ 2V ±0.75% Reference Output

♦ Power-Good Output

♦ Soft-Shutdown

♦ 5µA (typ) Shutdown Current

100mA Load Capability

Regulator (MAX1537 Only)

Adjustable Output (Dual Mode) Voltages

Protection

TOP VIEW

ILIM3

ILIM5

FSEL

Pin Configurations continued at end of data sheet.

GND

ON5

ON3

REF

5mm x 5mm

THIN QFN

MAX1533

Pin Configurations

www.DataSheet4U.com

Features

FB5

LDO5

DL5

PGND

DL3

LDO3

FB3

CSL3

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