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10-Channel Scan Driver

for TFT LCD with GPM Function

MAX17119

19-4952; Rev 0; 12/09

General Description

The MAX17119 includes a 10-channel, high-voltage,

level-shifting scan driver with a gate-pulse modulation

(GPM) feature to shape the corner of the scan-driver out-

put to reduce flicker. The device is optimized for thin-film

transistor (TFT) liquid-crystal display (LCD) applications.

The high-voltage level-shifting scan driver is designed to

drive the TFT panel gate logic. Its 10 outputs swing from

+38V (maximum) to -12V (minimum) and can swiftly drive

capacitive loads. There are two positive supply inputs

that provide flexibility for system design.

The GPM feature is employed to shape the corner of the

falling edge of the clock channels. This reduces flicker,

and therefore improves the display quality.

The MAX17119 also features a dedicated discharge

channel and an integrated voltage detector. When the

system shuts down, the voltage detector commands the

discharge channel to swing its output to positive sup-

ply voltage so as to remove any residual image on the

display quickly.

The MAX17119 is available in a 28-pin, 5mm x 5mm, thin

QFN package with a maximum thickness of 0.8mm for

thin LCD panels.

Applications

LCD Monitors

LCD TVs

Features

S High-Voltage Level-Shifting Scan Drivers

Logic-Level Inputs

+38V to -12V Outputs

GPM Feature

Discharge Channel

S Thermal-Overload Protection

S 28-Pin, 5mm x 5mm Thin QFN Package

Ordering Information

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

EVALUATION KIT

AVAILABLE

PART TEMP RANGE PIN-PACKAGE

MAX17119ETI+ -40NC to +85NC 28 TQFN

Summary of content (11 pages)

PAGE 1
9-4952; Rev 0; 12/09 TION KIT EVALUA BLE IL AVA A 10-Channel Scan Driver for TFT LCD with GPM Function Features The MAX17119 includes a 10-channel, high-voltage, level-shifting scan driver with a gate-pulse modulation (GPM) feature to shape the corner of the scan-driver output to reduce flicker. The device is optimized for thin-film transistor (TFT) liquid-crystal display (LCD) applications.
PAGE 2
MAX17119 10-Channel Scan Driver for TFT LCD with GPM Function ABSOLUTE MAXIMUM RATINGS A1–A9, VSENSE, FLK1, FLK2, FLK3 to GND...........-0.3V to +6V GON1, GON2 to GND............................................-0.3V to +40V GOFF to GND.........................................................-14V to +0.3V Y1–Y7, YDCHG to GND.........(VGOFF - 0.3V) to (VGON1 + 0.3V) Y8, Y9 to GND........................ (VGOFF - 0.3V) to (VGON2 + 0.3V) RE to GND............................................. -0.
PAGE 3
10-Channel Scan Driver for TFT LCD with GPM Function (Circuit of Figure 1, VGON_ = 30V, VGOFF = -6.2V, TA = 0°C to +85°C. Typical values are at TA = +25°C, unless otherwise noted.) PARAMETER CONDITIONS MIN TYP Propagation Delay FLK_ Falling to Y_ Discharge 50 Y_ to RE Switch On-Resistance 50 MAX UNITS ns 100 I Logic Input-Voltage Range (A1–A9) 5.5 V Logic Input Voltage Low (A1–A9) 0.
PAGE 4
MAX17119 10-Channel Scan Driver for TFT LCD with GPM Function ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 1, VGON_ = 30V, VGOFF = -6.2V, TA = -40°C to +85°C.) (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS Output Voltage High (Y1–Y7, YDCHG) IOUT = 10mA GON1 0.16 V Output Voltage High (Y8, Y9) IOUT = 10mA GON2 0.16 V Rise Time (Y1–Y7, YDCHG) TA = +25NC, VGON1 = 30V and VGOFF = -6.2V (Note 1) 200 ns 120 ns 200 ns 120 ns 100 I Logic Input-Voltage Range (A1–A9) 5.
PAGE 5
10-Channel Scan Driver for TFT LCD with GPM Function SCAN-DRIVER OUTPUT RISING EDGE (Y1–Y6) PROPAGATION DELAY AND RISE TIME SCAN-DRIVER OUTPUT FALLING EDGE (Y1–Y6) PROPAGATION DELAY AND FALL TIME MAX17119 toc01 MAX17119 toc02 VA 2V/div VA 2V/div 0V 0V VY 10V/div VY 10V/div 0V 0V 100ns/div 100ns/div SCAN-DRIVER OUTPUT RISING EDGE (Y7) PROPAGATION DELAY AND RISE TIME SCAN-DRIVER OUTPUT FALLING EDGE (Y7) PROPAGATION DELAY AND FALL TIME MAX17119 toc03 MAX17119 toc04 VA7 2V/div VA7 2V/div 0V
PAGE 6
MAX17119 10-Channel Scan Driver for TFT LCD with GPM Function Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.
PAGE 7
10-Channel Scan Driver for TFT LCD with GPM Function TOP VIEW Y9 Y8 Y7 Y6 Y5 Y4 Y3 21 20 19 17 16 15 18 YDCHG 22 14 Y2 GND 23 13 Y1 RE 24 12 GON2 FLK3 25 11 GOFF FLK2 26 10 GON1 FLK1 27 9 A1 8 A2 MAX17119 + VSENSE 28 1 2 3 4 5 6 7 A9 A8 A7 A6 A5 A4 A3 TQFN 5mm x 5mm Pin Description PIN NAME 1–9 A9–A1 Level-Shifter Logic-Level Input 10 GON1 Gate-On Supply Input 1. GON1 is the positive supply for the Y1–Y7 and YDCHG level shifters.
PAGE 8
MAX17119 10-Channel Scan Driver for TFT LCD with GPM Function VGON2 Typical Operating Circuit VGON1 1µF The MAX17119 typical operating circuit is shown in Figure 1. The positive supply voltage for GON1 and GON2 is 30V (typ) and negative supply voltage for GOFF is -6.2V (typ). 1µF GON2 GON1 FLK1 RE Detailed Description FLK2 3.4kI FLK3 A1 Y1 A2 Y2 A3 MAX17119 FROM TCON Y3 A4 Y4 A5 A6 Y6 A8 Y7 A9 FROM SYSTEM (3.
PAGE 9
10-Channel Scan Driver for TFT LCD with GPM Function GON1 FLK2 LDO FLK3 RE A1 Y1 A2 Y2 A3 Y3 A4 Y4 GATE DRIVE LOGIC AND GPM CONTROL A5 VLOGIC REF Y5 A6 Y6 A7 Y7 A8 Y8 A9 Y9 VSENSE YDCHG COMP REF GND GON2 VGON2 GOFF EP VGOFF Figure 2.
PAGE 10
MAX17119 10-Channel Scan Driver for TFT LCD with GPM Function Power-On and -Off Sequence A simple timing sequence of GPM is shown in Figure 3. The scan-driver outputs (Y1–Y6) follow their respective inputs (A1–A6). On the falling edge of VFLK_, the corner shaving on VY_ is implemented until VY_ is driven to VGOFF (VA_ goes low). Figure 5 shows the power-on and power-off sequence for the application. In general, the supply voltage for the timing controller (VLOGIC) is ready first.
PAGE 11
10-Channel Scan Driver for TFT LCD with GPM Function The MAX17119 includes a thermal-protection circuit. Thermal-overload protection prevents excessive power dissipation from overheating the MAX17119. When the junction temperature exceeds TJ = +160NC (typ), the device shuts down and all the outputs are put into highimpedance mode. The thermal protection is not latched and the device recovers once the temperature drops below the hysteretic threshold (+15NC typ).