ver: 0.2 dec 04, 2008 tel: 886-3-5788833 http://www.gmt.com.tw 1 AT1739 global mixed-mode technology inc. lcd panel step- up converter with analog multi- function 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, 0.2 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/s 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 applications ? lcd monitor panel modules ? nb lcd panel modules ? automotive displays 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. ordering information order number marking temp. range package (green) AT1739r51u a 1739 -40 c to 85 c tqfn4x4-24 note: r5: tqfn4x4-24 1 : bonding code u: tape & reel pin configuration AT1739 tqfn4x4-24 lx in ss agnd fbl outl vdd drvp fbp vp src go n drn 1 2 3 4 5 613 14 15 16 17 18 24 19 21 23 22 swctl 8 7 9 10 11 12 thermal pad dlp dlvd pg vsen in l outop posop co m p fb freq pg nd 20 AT1739 tqfn4x4-24 lx in ss agnd fbl outl vdd drvp fbp vp src go n drn 1 2 3 4 5 613 14 15 16 17 18 24 19 21 23 22 swctl 8 7 9 10 11 12 thermal pad dlp dlvd pg vsen in l outop posop co m p fb freq pg nd 20
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