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MAX1536ETI-T

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

Maxim Integrated 

19-2729; Rev 0; 1/03

EVAALVUAAILTAIOBNLEKIT

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

Down Regulator with Dynamic Output Voltage Control

General Description

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

ModeTM to maintain high efficiency during light-load

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.

________________________Applications

Chipset/Graphics Cores

with Dual-Supply Voltages

Active Termination Buses

Notebook Computers

DDR Memory Termination

Pin Configuration

Features

o Dynamically Selectable Output Voltage from

+0.7V to VIN

o Internal PMOS/NMOS Switches

54mΩ/47mΩ On-Resistance at VIN = +4.5V

63mΩ/53mΩ On-Resistance at VIN = +3.0V

o +3.0V to +5.5V Input Voltage Range

o 1.4MHz Maximum Switching Frequency

o 2V ±0.75% Reference Output

o Constant-Off-Time PWM Operation

o Selectable Idle Mode/PWM Operation at Light

Loads

o 100% Duty Factor in Dropout

o Digital Soft-Start Inrush Current Limiting

o <1µA Typical Shutdown Supply Current

o <750µA Quiescent Supply Current

o Thermal Shutdown

o 1% VOUT Accuracy Over Line and Load

o External Reference Input

o Power-Good Window Comparator

o Selectable Power-Good Blanking Time During

Output-Voltage Transition

Ordering Information

PART

MAX1536ETI

TEMP RANGE PIN-PACKAGE

-40oC to +85oC 28 Thin QFN 5mm x 5mm

Minimal Operating Circuit

TOP VIEW

LX 1

IN 2

IN 3

SHDN 4

SKIP 5

FB 6

COMP 7

MAX1536

EXPOSED PADDLE

21 LX

20 IN

19 IN

18 PGOOD

17 FBLANK

16 VCC

15 AGND

VIN

+3.0V TO +5.5V

IN

LX

VCC

SHDN

FB

PGND

AGND

COMP MAX1536 REF

PGOOD

TOFF

REFIN

VOUT

+0.7V TO VIN

SKIP

THIN QFN

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

________________________________________________________________ Maxim Integrated Products 1

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.

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