Rainbow-electronics MAX17117 Instrukcja Użytkownika Pobierz pdf

_______________________________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

Internal-Switch Boost Regulator with Integrated

7-Channel Scan Driver, Op Amp, and LDO

MAX17117

General Description

The MAX17117 includes a high-performance step-up

regulator, a 350mA low-dropout (LDO) linear regulator,

a high-speed operational amplifier, and a high-voltage

level-shifting scan driver with gate-shading control. The

device is optimized for thin-film transistor (TFT) liquid-

crystal display (LCD) applications.

The step-up DC-DC converter provides the regulated

supply voltage for panel source-driver ICs. The high

1.2MHz switching frequency allows the use of ultra-small

inductors and ceramic capacitors. The current-mode

control architecture provides a fast-transient response to

pulsed loads typical of source driver loads. The step-up

regulator features an adjustable soft-start and an adjust-

able cycle-by-cycle current limit.

The high-current operational amplifier is designed to

drive the LCD backplane (VCOM). The amplifier features

high output current (Q200mA typ), fast slew rate (40V/Fs

typ), wide bandwidth (16MHz typ), and rail-to-rail inputs

and outputs.

The low-voltage LDO linear regulator has an integrated

0.8I pass element and can provide at least 350mA. The

output voltage is accurate within Q1%.

The high-voltage, level-shifting scan driver with gate-

shading control is designed to drive the TFT panel gate

drivers. Its seven outputs swing 40V (maximum) between

+35V (maximum) and -15V (minimum) and can swiftly

drive capacitive loads.

The MAX17117 is available in a 32-pin, 5mm x 5mm, thin

QFN package with a maximum thickness of 0.8mm for

thin LCD panels.

Applications

Notebook Computer Displays

Features

S 2.3V to 5.5V IN Supply-Voltage Range

S 1.2MHz Current-Mode Step-Up Regulator

Fast-Transient Response

High-Accuracy Reference (1%)

Integrated 16V, 2A, 200mI MOSFET

High Efficiency (> 85%)

Adjustable Cycle-by-Cycle Current Limit

S High-Performance Operational Amplifier

200mA Output Short-Circuit Current

40V/µs Slew Rate

16MHz, -3dB Bandwidth

Low-Dropout Linear Regulator

High-Accuracy Output Voltage (1.0%)

S High-Voltage Drivers with Scan Logic

+35V to -15V Outputs

40V Maximum Voltage Swing

Gate-Shading Control

S Thermal-Overload Protection

S 32-Pin, 5mm x 5mm, Thin QFN Package

19-5241; Rev 0; 4/10

Simplified Operating Circuit

Ordering Information

+Denotes a lead(Pb)-free/RoHS-compliant package.

*EP = Exposed pad.

EVALUATION KIT

AVAILABLE

SYSTEM

PANEL

VGL

MAIN

GHON

TO VCOM

BACKPLANE

SCAN DRIVER AND

GATE-SHADING

CONTROL LOGIC

LOGIC

ENA

LDOADJ

LDOO

DTS

GHON

CK1

CK3

CK5

CK2

CK4

CK6

VGL

LINEAR

REGULATOR

SETUP

CONTROLLER

GATE-

SHADING

TIMING

CONTROL

MAX17117

PGND

COMP

AGND

(EP)

OPAS

OUT

POS

STH

CKH1

CKH3

CKH5

CKH2

CKH4

CKH6

VGLC

PART TEMP RANGE PIN-PACKAGE

MAX17117ETJ+ -40NC to +85NC 32 TQFN-EP*

1 2 3 4 5 6 ... 21 22

Podsumowanie treści

Strona 1 - MAX17117

_______________________________________________________________ Maxim Integrated Products 1For pricing, delivery, and ordering information, pleas

Strona 2

Internal-Switch Boost Regulator with Integrated 7-Channel Scan Driver, Op Amp, and LDOMAX1711710 _________________________________________________

Strona 3