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MAX8723

Low-Cost, Internal-Switch, Step-Down Regulator for LCD Displays

Maxim Integrated 

XX-XXXX; Rev 0; 3/06

Low-Cost, Internal-Switch, Step-Down

Regulator for LCD Displays

General Description

The MAX8723 is a high-efficiency, switch-mode, step-

down regulator with a 14V internal power switch. With only

a few external passive components, this low-cost regulator

can generate a fixed 3.3V or adjustable DC output voltage

of 2.0V to 3.6V (dual mode) from a 6V to 13.2V DC source.

The 13.2V input voltage range makes this part ideal for

LCD displays, point-of-load regulators, and other 8/12V-

powered industrial equipment applications.

The MAX8723 can deliver up to 2A. It features an inter-

nal power MOSFET, a built-in bootstrap diode for its

MOSFET driver, and an interface for an external syn-

chronous rectifier MOSFET drive to replace the

Schottky diode and improve efficiency. Its fixed-fre-

quency PWM/skip-mode operation and current-mode

control architecture provide fast load-transient

response without compensation. The switching fre-

quency is a pin-selectable 500kHz, 1MHz, or 1.5MHz,

minimizing the size of external components.

The MAX8723 has built-in soft-start, current-limit, ther-

mal-shutdown, and timer-delayed output-fault shutdown

functions. The soft-start function limits inrush current

during startup, avoiding transients that can trigger the

front-end protection circuits and lock up the system.

The current limit, thermal-shutdown, and timer-delayed

output-fault shutdown functions protect the power sup-

ply against fault conditions.

The MAX8723 also includes a linear regulator (VL) which

provides a fixed 5V output (25mA) to support small exter-

nal loads. The reference output is high-precision (2V

± 1%) and can also supply small external load currents.

The MAX8723 is available in the 16-pin 4mm x 4mm

TQFN package.

Applications

LCD TVs

LCD Monitors

Digital System Power Supplies

Point-of-Load Regulators

8/12V Industrial Equipment

Pin Configuration appears at end of data sheet.

Features

♦ 6V to 13.2V Input Supply Range

♦ Integrated 14V 2A N-Channel MOSFET Switch

♦ Preset 1.5% Accurate 3.3V fixed Output Voltage or

2.0V to 3.6V Adjustable Output (Dual Mode)

♦ Current-Mode PWM Operation

♦ Frequency-Selectable 500kHz/1MHz/1.5MHz

♦ Internal 5V Linear Regulator Supports Up to 25mA

External Load

♦ 2V Precision Reference (1%)

♦ Integrated Bootstrap Diode for High-Side

MOSFET Drive

♦ External Synchronous Rectifier Driver

♦ Built-In Soft-Start

♦ 200µA Standby Mode

♦ Timer-Delayed Output Fault Protection

♦ Thermal Shutdown Protection

♦ Small 16-Pin 4mm x 4mm Thin QFN Package

Ordering Information

PART

TEMP RANGE PIN-PACKAGE

MAX8723ETE+ -40°C to +85°C

16-pin Thin QFN

4mm x 4mm

PKG

CODE

T1644-4

Simplified Operating Circuit

IN

CINL

INL

CREF

CVL

REF

BST

IN

VCC

SHDN

SKIP

VL

LX

MAX8723

GND

PGND

FSEL

EXT

OUT

I.C.

EP

FB

CBST

CIN

L

D

OUT

COUT

________________________________________________________________ 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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