ver: 0.1 oct 25, 2013 tel: 886-3-5788833 http://www.gmt.com.tw 1 G2511 global mixed-mode technology integrated power supply for tft-lcd panels with 6-channel white led driver features ? 2.5v to 5.5v input supply range ? boost regulator ? 1.2mhz fixed frequency ? current-mode control ? fast transient response to pulse load ? 1% accurate output voltage ? built-in 20v/2a, 0.2 n-channel mosfet ? high efficiency up to 90% ? programmable soft-start ? over-current protection ? output under-voltage protection ? white-led driver ? wide 4.2v to 24v input supply range ? 1.2mhz fixed frequency ? high efficiency up to 90% ? 40v/2a, 0.2 n-channel mosfet ? input under-voltage protection ? over current protection ? over voltage protection ? maximum programmable led channel current 30ma ? current accuracy 3% and current balance 2% ? 100hz~25khz pwm dimming ? mixed mode and pwm dimming method ? high-performance operational amplifiers ? 200ma output short-circuit current ? 12v/ s slew rate ? 12mhz, -3db bandwidth ? rail-to-rail input and output ? low dropout voltage linear regulator ? 350ma maximum output current ? adjustable output voltage ? on-chip gpm controller ? flicker compensator ? power-on sequence control ? linear regulator controller for vgl ? low voltage detector ? programmable detecting voltage and delay time ? thermal protection ? rohs compliant ? tqfn5x5-40 package applications ? notebook computer displays ? umpcs ? lcd monitor general description the G2511 includes a high-performance boost regulator, 6-channel led driver, a low dro pout linear regulator (ldo), a gate pulse modulator (gpm), a voltage detector, a vcom buffer (unity-gain opa), and a vgl linear regulator for ac- tive-matrix thin-film transistor (tft) liquid-crystal displays (lcds). the boost converter provides the regulated supply volt- age for the panel source driver ics. the converter is a high switching frequency (1.2mhz) current-m ode regula- tor with an integrated 20v n-channel 0.2 mosfet that allows the use of ultr a-small inductors and ceramic capacitors. it provides fast transient response to pulsed loading while achieving efficiency over 90%. the device can produce output voltage as high as 15v from an input as low as 2.8v. soft-start is programmed by external capacitor, which sets the input-current ramp-rate. the led driver automatically regulated supply voltage for the led light bars without t he need to calculate the output for different led types. it also integrates a 40v n-channel mosfet that provides hi gh output power. the 6-channel current driver is ideal for c onstant current driving, and, well matched less than 3%. to set the maximum driving current, the iset pin is used to determine reference cur- rent. each channel of the current drivers is set to 800 times of this reference current. a pwm pin can be used to perform pwm dimming from the range of 100hz to 25khz. the mode pin in G2511 is used to set the dimming mode. if mode pin set to vcc or floating, the dimming mode is in the pwm mode, t he current driver on/off is synchronized with the pwmb signal. if mode pin set to gnd, pwmb and iled current is set at pwmb duty mul- tiplied by iset current when pwmb duty 25%. if the pwmb duty <25%, the iled curr ent is fixed at 0.25xiset, and the dimming duty is 4 x pwmb duty. open led-string automatically dis able the channel from enter- ing over voltage protection. the low-dropout (ldo) linear regulator can supply up to 350ma current while input voltag e is 3.3v. it uses an inter- nal pmos as the pass device. it is suitable for the supply voltage of the timing controller. the gpm is controlled by frame signals from timing con- troller to modulate the gate-o n voltage, vghm, which acts a flicker compensation circuit to reduce the coupling effect between gate lines and pixels. it also can delay the gate-on voltage by the internal timer (60ms) while power-on for achieving a corrected power-on sequence for gate driver ics. the falling ti me of the gate-on voltage is programmable by external capacitor and resistor. the voltage detector monitors the supply voltage to issue a reset signal while the detec ted voltage is too low. the detecting level is decided by an external resistor divider and the delay time is programmable by an external ca- pacitor. the vcom buffer can drive the lcd vcom voltage that features high short-circuit curr ent (200ma), fast slew rate (12v/ s), wide bandwidth (12mhz) and rail-to-rail in- put/output. the gate-off linear regulator controller provides regulated tft gate-off supplies using external charge pump at- tached to the switching node. using the gate-low regula- tor after the produced negativ e voltage can regulate the exceeded voltage.
ver: 0.1 oct 25, 2013 tel: 886-3-5788833 http://www.gmt.com.tw 2 G2511 global mixed-mode technology ordering information order number marking temp. range package (green) G2511rg1u 2511 -40 c to +85 c tqfn5x5-40 note: rg:tqfn5x5-40 1: bonding code u: tape & reel pin configuration enb vinb vcc vcompb isetb pwmb vflk re vghm vgh avdd agnd cs5 cs4 cs2 cs1 mode ovpb pgndb lxb reset vref fbn drvn cd vdiv comp 1 2 3 4 5 6 7 8 9 10 pgnd vin ldoi ldoo ena opao opai 11 12 13 14 15 16 17 18 19 20 G2511 tqfn5x5-40 thermal pad 30 29 28 27 26 25 24 23 22 21 40 39 38 37 36 35 34 33 32 31 ss fb cs3 lx note: recommend connecting the thermal pad to the ground for excellent power dissipation. cs6 adj enb vinb vcc vcompb isetb pwmb vflk re vghm vgh avdd agnd cs5 cs4 cs2 cs1 mode ovpb pgndb lxb reset vref fbn drvn cd vdiv comp 1 2 3 4 5 6 7 8 9 10 pgnd vin ldoi ldoo ena opao opai 11 12 13 14 15 16 17 18 19 20 G2511 tqfn5x5-40 thermal pad 30 29 28 27 26 25 24 23 22 21 40 39 38 37 36 35 34 33 32 31 ss fb cs3 lx note: recommend connecting the thermal pad to the ground for excellent power dissipation. cs6 adj
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