TFT- LCD DC-DC Converters with Operational Amplifiers

EC9219

P 1 / 14

2009/09/29

General

Description

The EC9219 include a high-performance step-up regulator, and high-current operational amplifiers for active-matrix

thin-film transistor (TFT) liquid-crystal displays (LCDs).

The step-up DC-DC converter provides the regulated supply voltage for the panel source driver ICs. The converter is

a high-frequency (1.2MHz or 640KHZ) current-mode regulator with an integrated 18V n-channel MOSFET that

allows the use of ultra-small inductors and ceramic capacitors. It provides fast transient response to pulsed loads

while achieving efficiencies over 85%.

The EC9219 includes one operational amplifier. These amplifiers are designed to drive the LCD backplane (VCOM)

and/or the gamma-correction divider string. The devices feature high output current (±150mA), fast slew rate

(17V/μs), wide bandwidth (12MHz), and rail-to-rail inputs and outputs

The EC9219 are available in 14- pin thin TSOP packages with a maximum thickness of 1mm for ultra-thin LCD

panels.

Features

2.6V to 5.5V Input Supply Range

1.2MHz or 640KHZ Current-Mode Step-Up Regulator

Fast Transient Response to Pulsed Load

High-Accuracy Output Voltage ( 2% )

Built-In 18V, 1.6A, 0.16Ω N-Channel MOSFET

High Efficiency (90%)

High-Performance Operational Amplifiers

17V/μs Slew Rate

12MHz, -3dB Bandwidth

Rail-to-Rail Inputs/Outputs

Thermal-Overload Protection

Applications

Notebook Computer Displays ,

LCD Monitor Panels ,

Automotive Displays

Ordering information

PART NO

MARKING

PACKAGE

EC9219I-G

EC9219-G

TSSOP14 Green Package

EC9219G-G

EC9219G

TQFN16 Green Package