AT1739

Global Mixed-mode Technology Inc. AT1739 LCD Panel Step- up Converter with Analog MultiFunction Outputs Features 2.6V to 5.5V Input Supply Range 640kHz/1.2MHz Current-Mode PWM Step-Up Regulator: Fast Transient Response 1.0% High-Accuracy Output Voltage Built-In 18V, 2.0A, 0.2Ω N-Channel MOSFET Programmable Soft-Start Current-Limit Latched Fault Protection with Timer High Efficiency Gate-On Charge Pump Regulator Controller with Latched Fault Protection with Timer High-Performance Linear Regulator: 1.5% Output Accuracy Works with Small Ceramic Output Capacitors Fast Transient Response Foldback Current Limit High-Current Operational Amplifier: ±150mA Output Short-Circuit Current 13V/µs Slew Rate 12MHz, -3dB Bandwidth Rail-to-Rail Input/Output Gate-on Pulse Modulator with Adjustable Delay for Sequence Control Voltage Detector with Adjustable Delay General Description The AT1739 offers a complete power-supply solution for TFT LCD panels used in LCD monitors and NB LCD panels. The AT1739 consists of a high-performance step-up converter, a low-power charge-pump regulator, a high-performance linear regulator, an operational amplifier, a voltage detector and a logic-controlled gate-on pulse modulator. The step-up DC-DC converter provides the regulated supply voltage for the panel source driver ICs. The charge-pump regulator generates the positive gate-on supply voltage. The operational amplifier supplies the VCOM buffer with high output current, fast slew rate and wide bandwidth performances for driving capacitive loads. The high-voltage gate-on pulse modulator to control the positive gate-on output voltage waveform for reducing the flicker on TFT LCD panel. The high-performance linear regulator uses an internal P-channel MOSFET to supply load currents up to 350mA. It provides the regulated supply voltage for the TCON IC. The voltage detector with adjustable detected voltage-point and delay-time monitors the input supply voltage to prevent the improper shutdown of the system power application. The AT1739 is available in a 24-pin thin QFN package which is 4mm x 4mm with a maximum thickness of 0.8mm for ultra-thin LCD panel design. Applications LCD Monitor Panel Modules NB LCD Panel Modules Automotive Displays Ordering Information ORDER NUMBER AT1739R51U MARKING A1739 TEMP. RANGE -40°C to 85°C PACKAGE (Green) TQFN4X4-24 Note: R5: TQFN4X4-24 1 : Bonding Code U: Tape & Reel P OS OP 20 O UTOP 19 Pin Configuration 23 21 24 22 CO MP PG ND FRE Q FB LX IN SS A GND FBL O UTL 1 2 3 4 5 6 10 DL P 1 1 12 7 8 9 Thermal Pad 18 17 16 15 14 13 VDD DRVP FBP VP SRC GON DRN V SE N PG DL VD AT1739 AT1739 TQFN4X4-24 SWCTL INL Ver: 0.2 Dec 04, 2008 TEL: 886-3-5788833 http://www.gmt.com.tw 1