MAX1748EUEmaxim美信芯片电子元器件中文版规格手册.pdf

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General Description

The MAX1748/MAX8726 triple-output DC-DC converters

in a low-profile TSSOP package provide the regulated

voltages required by active-matrix, thin-film transistor

(TFT) liquid-crystal displays (LCDs). One high-power

DC-DC converter and two low-power charge pumps

convert the +3.3V to +5V input supply voltage into three

independent output voltages.

The primary 1MHz DC-DC converter generates a boost-

ed output voltage (V

MAIN

) up to 13V using ultra-small

inductors and ceramic capacitors. The low-power

BiCMOS control circuitry and the low on-resistance

(0.35Ω) of the integrated power MOSFET allows effi-

ciency up to 93%.

The dual charge pumps independently regulate one

positive output (V

POS

) and one negative output (V

NEG

These low-power outputs use external diode and

capacitor stages (as many stages as required) to regu-

late output voltages up to +40V and down to -40V. A

proprietary regulation algorithm minimizes output rip-

ple, as well as capacitor sizes for both charge pumps.

For both the MAX1748 and MAX8726, the supply

sequence is V

MAIN

first, V

NEG

next, and finally V

POS

The MAX1748 soft-starts each supply as soon as the

previous supply finishes. The MAX8726 adds a delay

between the startups of V

MAIN

and V

NEG

and also

between V

NEG

and V

POS

The MAX1748/MAX8726 are available in the ultra-thin

TSSOP package (1.1mm max height).

Applications

TFT Active-Matrix LCD Displays

Passive-Matrix LCD Displays

PDAs

Digital Still Cameras

Camcorders

Features

♦ Three Integrated DC-DC Converters

♦ 1MHz Current-Mode PWM Boost Regulator

Up to +13V Main High-Power Output

±1% Accuracy

High Efficiency (93%)

♦ Dual Charge-Pump Outputs

Up to +40V Positive Charge-Pump Output

Down to -40V Negative Charge-Pump Output

♦ Internal Supply Sequencing

♦ Internal Power MOSFETs

♦ +2.7V to +5.5V Input Supply

♦ 0.1µA Shutdown Current

♦ 0.6mA Quiescent Current

♦ Internal Soft-Start

♦ Power-Ready Output

♦ Ultra-Small External Components

♦ Thin TSSOP Package (1.1mm max)

MAX1748/MAX8726

Triple-Output TFT-LCD

DC-DC Converters

________________________________________________________________ Maxim Integrated Products 1

RDY TGND

PGND

SUPP

DRVP

SUPN

DRVN

SHDN

TOP VIEW

MAX1748

MAX8726

TSSOP

INTG

REF

GND

FBP

FBN

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

Pin Configuration

19-3430; Rev 0; 10/04

For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.

For small orders, phone 1-800-835-8769.

EVALUATION KIT

AVAILABLE

Ordering Information

Typical Operating Circuit appears at end of data sheet.

PART TEMP RANGE PIN-PACKAGE

MAX1748EUE -40°C to +85°C 16 TSSOP

MAX8726EUE -40°C to +85°C 16 TSSOP

MAX1748/MAX8726

Triple-Output TFT-LCD

DC-DC Converters

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

= +3.0V, SHDN = IN, V

SUPP

= V

SUPN

= 10V, TGND = PGND = GND, C

REF

= 0.22µF, C

INTG

= 470pF, T

= 0°C to +85°C, unless

otherwise noted. Typical values are at T

= +25°C.)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

IN, SHDN, TGND to GND .........................................-0.3V to +6V

DRVN to GND .........................................-0.3V to (V

SUPN

+ 0.3V)

DRVP to GND..........................................-0.3V to (V

SUPP

+ 0.3V)

PGND to GND.....................................................................±0.3V

RDY to GND ...........................................................-0.3V to +14V

LX, SUPP, SUPN to PGND .....................................-0.3V to +14V

INTG, REF, FB, FBN, FBP to GND...............-0.3V to (V

+ 0.3V)

Continuous Power Dissipation (T

= +70°C)

16-Pin TSSOP (derate 9.4mW/°C above +70°C) ..........755mW

Operating Temperature Range

MAX1748EUE/MAX8726EUE..........................-40°C to +85°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Input Supply Range V

2.7 5.5 V

Input Undervoltage Threshold

UVLO

rising, 40mV hysteresis (typ) 2.2 2.4 2.6 V

IN Quiescent Supply Current I

= V

FBP

= 1.5V, V

FBN

= -0.2V 0.6 1 mA

SUPP Quiescent Current I

SUPP

FBP

= 1.5V 0.4 0.8 mA

SUPN Quiescent Current I

SUPN

FBN

= -0.1V 0.4 0.8 mA

IN Shutdown Current V

SHDN

= 0, V

= 5V 0.1 10 µA

SUPP Shutdown Current V

SHDN

= 0, V

SUPP

= 13V 0.1 10 µA

SUPN Shutdown Current V

SHDN

= 0, V

SUPN

= 13V 0.1 10 µA

MAIN BOOST CONVERTER

Output Voltage Range

MAIN

13 V

FB Regulation Voltage V

= 0°C to +85°C

1.235 1.248 1.261

FB Input Bias Current I

= 1.25V, INTG = GND -50

+50

Operating Frequency f

OSC

0.85

1.15

MHz

Oscillator Maximum Duty Cycle

78 85 90 %

Load Regulation I

MAIN

= 0 to 200mA, V

MAIN

= 10V 0.2 %

Line Regulation 0.1

% / V

Integrator Gm

320

µmho

LX Switch On-Resistance

(

)

= 100mA

0.35

0.7 Ω

LX Leakage Current I

= 13V

0.01

20 µA

Phase I = soft-start (1.0ms)

0.275 0.380 0.500

Phase II = soft-start (1.0ms)

0.75

Phase III = soft-start (1.0ms)

1.12

LX Current Limit

(

MAX

)

Phase IV = fully on (after 3.0ms) 1.1 1.5 2.0

Maximum RMS LX Current 1A

Soft-Start Period t

Power-up to the end of phase III

3072 /

OSC

FB Fault Trip Level

1.07

1.1

1.14

POSITIVE CHARGE PUMP

SUPP

Input Supply Range

SUPP

2.7

13.0

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