Rainbow-electronics MAX8712 User Manual download pdf

General Description

The MAX8710/MAX8711/MAX8712 offer complete lin-

ear-regulator power-supply solutions for thin-film tran-

sistor (TFT) liquid-crystal-display (LCD) panels used in

LCD monitors and LCD TVs. All three devices include a

high-performance AVDD linear regulator, a positive

charge-pump regulator, a negative charge-pump regu-

lator, and built-in power-up sequence control. The

MAX8710 and MAX8711 also include a high-current

operational amplifier. Additionally, the MAX8710 pro-

vides logic-controlled high-voltage switches to control

the positive charge-pump output.

The linear regulator directly steps down the input volt-

age to generate the supply voltage for the source-driver

ICs (AVDD). The two built-in charge-pump regulators

are used to generate the TFT gate-on and gate-off sup-

plies. The high-current operational amplifier is typically

used to drive the LCD backplane (VCOM) and features

high output current (150mA), fast slew rate (12V/µs),

and wide bandwidth (12MHz). Its Rail-to-Rail

inputs

and output maximize flexibility.

The MAX8710 is available in a 24-pin thin QFN package,

the MAX8711 is available in a 16-pin thin QFN package,

and the MAX8712 is available in a 12-pin thin QFN pack-

age. All three packages are 4mm x 4mm with a maximum

thickness of 0.8mm for ultra-thin LCD panel design. They

operate over the -40°C to +100°C temperature range.

Applications

LCD Monitor Panel Modules

LCD TV Panel Modules

Features

♦ High-Performance Linear Regulator

1.6% Output Accuracy

Works with Small Ceramic Output Capacitors

Fast Transient Response

Foldback Current Limit

♦ 50mA Negative Regulated Charge Pump

♦ 20mA Positive Regulated Charge Pump with

Adjustable Delay

♦ Built-In Power-Up Sequence

♦ High-Current Operational Amplifier

(MAX8710/MAX8711)

±150mA Output Short-Circuit Current

12V/µs Slew Rate

12MHz, -3dB Bandwidth

Rail-to-Rail Inputs/Output

♦ Dual-Mode™ High-Voltage Switches (MAX8710)

♦ Thermal Protection

♦ Latched Fault Protection with Timer

MAX8710/MAX8711/MAX8712

Low-Cost Linear-Regulator

LCD Panel Power Supplies

________________________________________________________________ Maxim Integrated Products 1

FBN

SUPCP

DRVN

DLP

POSB

SUPB

OUTB

NEGB

MODE

CTL

GND

INL

OUTL

FBL

SHDN

DRVP

FBP

SRC

VGON

AVDD

GON

DRN

THR

REF

VGOFF

CTL

AVDD

VCOM

REF

AVDD

VIN

MAX8710

Minimum Operating Circuit

SRC

FBN

DLP

MODE

FBL

CTL

OUTL

SUPCP

DRVN

DRVP

N.C.

GND

OUTB

SUPB

THR

FBP

SHDN

NEGB

INL

POSB

REF

DRN

GON

MAX8710

THIN QFN 4mm x 4mm

TOP VIEW

Pin Configurations

Ordering Information

PART

TEMP RANGE

PIN-PACKAGE

MAX8710ETG

-40°C to +100°C

24 Thin QFN 4mm x 4mm

MAX8711ETE

-40°C to +100°C

16 Thin QFN 4mm x 4mm

MAX8712ETC

-40°C to +100°C

12 Thin QFN 4mm x 4mm

19-3174; Rev 0; 1/04

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.

Pin Configurations continued at end of data sheet.

EVALUATION KIT

AVAILABLE

Rail-to-Rail is a registered trademark of Motorola, Ltd. Dual Mode is a trademark of Maxim Integrated Products, Inc.

1 2 3 4 5 6 ... 22 23

Summary of Contents

Page 1 - LCD Panel Power Supplies

General DescriptionThe MAX8710/MAX8711/MAX8712 offer complete lin-ear-regulator power-supply solutions for thin-film tran-sistor (TFT) liquid-crystal-

Page 2

MAX8710/MAX8711/MAX8712Low-Cost Linear-Regulator LCD Panel Power Supplies10 __________________________________________________________________________

Page 3

MAX8710/MAX8711/MAX8712Low-Cost Linear-Regulator LCD Panel Power Supplies_____________________________________________________________________________

Page 4

MAX8710/MAX8711/MAX8712Low-Cost Linear-Regulator LCD Panel Power Supplies12 __________________________________________________________________________

Page 5

MAX8710/MAX8711/MAX8712Low-Cost Linear-Regulator LCD Panel Power Supplies_____________________________________________________________________________

Page 6

MAX8710/MAX8711/MAX8712Low-Cost Linear-Regulator LCD Panel Power Supplies14 __________________________________________________________________________

Page 7

MAX8710/MAX8711/MAX8712Low-Cost Linear-Regulator LCD Panel Power Supplies_____________________________________________________________________________

Page 8

(VCX(POS) + VINPUT), charge flows from CX(POS)toCOUT(POS) until diode D2 turns off.The positive charge-pump regulator’s startup can bedelayed by conne

Page 9

MAX8710/MAX8711/MAX8712Low-Cost Linear-Regulator LCD Panel Power Supplies_____________________________________________________________________________

Page 10

MAX8710/MAX8711/MAX8712Low-Cost Linear-Regulator LCD Panel Power Supplies18 __________________________________________________________________________

Page 11

Design ProcedureLinear RegulatorOutput-Voltage SelectionAdjust the linear-regulator output voltage by connectinga resistive voltage-divider from the l

Page 12

MAX8710/MAX8711/MAX8712Low-Cost Linear-Regulator LCD Panel Power Supplies2 ___________________________________________________________________________

Page 13

MAX8710/MAX8711/MAX8712Low-Cost Linear-Regulator LCD Panel Power Supplies20 __________________________________________________________________________

Page 14

Charge-Pump Output CapacitorIncreasing the output capacitance or decreasing theESR reduces the output ripple voltage and the peak-to-peak transient vo

Page 15

PC Board Layout GuidelinesCareful PC board layout is important for proper opera-tion. Use the following guidelines for good PC boardlayout:1) Create a

Page 16

MAX8710/MAX8711/MAX8712Low-Cost Linear-Regulator LCD Panel Power SuppliesMaxim cannot assume responsibility for use of any circuitry other than circui

Page 17

MAX8710/MAX8711/MAX8712Low-Cost Linear-Regulator LCD Panel Power Supplies_____________________________________________________________________________

Page 18

MAX8710/MAX8711/MAX8712Low-Cost Linear-Regulator LCD Panel Power Supplies4 ___________________________________________________________________________

Page 19

MAX8710/MAX8711/MAX8712Low-Cost Linear-Regulator LCD Panel Power Supplies_____________________________________________________________________________

Page 20

MAX8710/MAX8711/MAX8712Low-Cost Linear-Regulator LCD Panel Power Supplies6 ___________________________________________________________________________

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MAX8710/MAX8711/MAX8712Low-Cost Linear-Regulator LCD Panel Power Supplies_____________________________________________________________________________

Page 22

MAX8710/MAX8711/MAX8712Low-Cost Linear-Regulator LCD Panel Power Supplies8 ___________________________________________________________________________

Page 23

MAX8710/MAX8711/MAX8712Low-Cost Linear-Regulator LCD Panel Power Supplies_____________________________________________________________________________

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Rainbow-electronics MAX8712 User Manual

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