MAX1536 Maxim Integrated Products, MAX1536 Datasheet

MAX1536

Manufacturer Part Number

MAX1536

Description

3.6A 1.4MHz Low-Voltage Internal-Switch Step-Down Regulator with Dynamic Output Voltage Control

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX1536.pdf (19 pages)

Available stocks

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Manufacturer

Quantity

Price

Company:

H&T Electronics

Part Number:

MAX1536ETI

Quantity:

4 400

Company:

Meier Automation Equipment Co., Limited

Part Number:

MAX1536ETI+

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MAXIM/美信

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The MAX1536 constant-off-time, pulse-width-modulated

(PWM) step-down DC-to-DC converter is ideal for use in

+5.0V and +3.3V to low voltages for notebook and sub-

notebook computers. The MAX1536 features an internal

PMOS power switch and internal synchronous rectifica-

tion for high efficiency and reduced component count. No

external Schottky diode is required across the internal

synchronous rectifier switch. The internal 54mΩ PMOS

power switch and 47mΩ NMOS synchronous-rectifier

switch easily deliver continuous load currents up to 3.6A.

The MAX1536 produces dynamically adjustable output

voltages for chipsets and graphics processor cores using

a logic-level control signal. The MAX1536 achieves effi-

ciencies as high as 96%.

The MAX1536 uses a unique current-mode, constant-off-

time, PWM control scheme. It has selectable Idle

Mode

operation, or fixed-PWM mode for low output ripple. The

programmable constant-off-time architecture allows a

wide range of switching frequencies up to 1.4MHz, opti-

mizing performance trade-offs between efficiency, output

switching noise, component size, and cost. The

MAX1536 features a digital soft-start to limit surge cur-

rents during startup, a 100% duty-cycle mode for low-

dropout operation, and a low-power shutdown mode that

disconnects the input from the output and reduces supply

current below 1µA. The MAX1536 is available in a 28-pin

thin QFN package with an exposed backside pad.

19-2729; Rev 1; 8/05

Chipset/Graphics Cores

with Dual-Supply Voltages

Active Termination Buses

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

________________________Applications

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.

Down Regulator with Dynamic Output Voltage Control

LCJ/JH 9/22/05 (P1)

TOP VIEW

A "+" SIGN WILL REPLACE THE FIRST PIN INDICATOR ON LEAD-FREE PACKAGES.

to maintain high efficiency during light-load

3.6A, 1.4MHz, Low-Voltage, Internal-Switch Step-

________________________________________________________________ Maxim Integrated Products

General Description

EXPOSED PADDLE

THIN QFN

MAX1536

Pin Configuration

Notebook Computers

DDR Memory Termination

♦ Dynamically Selectable Output Voltage from

♦ Internal PMOS/NMOS Switches

♦ +3.0V to +5.5V Input Voltage Range

♦ 1.4MHz Maximum Switching Frequency

♦ 2V ±0.75% Reference Output

♦ Constant-Off-Time PWM Operation

♦ Selectable Idle Mode/PWM Operation at Light

♦ 100% Duty Factor in Dropout

♦ Digital Soft-Start Inrush Current Limiting

♦ <1µA Typical Shutdown Supply Current

♦ <750µA Quiescent Supply Current

♦ Thermal Shutdown

♦ 1% V

♦ External Reference Input

♦ Power-Good Window Comparator

♦ Selectable Power-Good Blanking Time During

+Denotes lead-free package.

MAX1536ETI

MAX1536ETI+

+0.7V to V

Loads

Output-Voltage Transition

54mΩ/47mΩ On-Resistance at V

63mΩ/53mΩ On-Resistance at V

+3.0V TO +5.5V

PART

OUT

Accuracy Over Line and Load

Minimal Operating Circuit

-40

TEMP RANGE

SHDN

COMP

PGOOD

TOFF

SKIP

C to +85

Ordering Information

MAX1536

PGND

AGND

REFIN

REF

PIN-PACKAGE

28 Thin QFN 5mm x 5mm

www.DataSheet4U.com

= +4.5V

= +3.0V

Features

+0.7V TO V

OUT

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