ver: 0.9 jul 21, 2010 tel: 886-3-5788833 http://www.gmt.com.tw 1 G5521 global mixed-mode technology inc. integrated multi-channel dc-dc converter for tft-lcd panels features ? 2.5v to 5.5v input supply range ? 640khz/1.2mhz current-mode boost regulator ? 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 ? high-performance operational amplifiers 150ma 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 ? adjustable falling time and power-on delay ? flicker compensator ? power-on sequence control ? charge pump for vgh regulation ? low voltage detector ? programmable detecting voltage and delay time ? thermal-overload protection ? rohs compliant ? tqfn4x4-24 package applications ? lcd monitor ? notebook computer displays ? lcd tvs general description the G5521 includes a high-performance boost regulator, a low dropout linear regulator (l do), a gate pulse modulator (gpm), a voltage detector, a vc om buffer (unity-gain opa), and a vgh charge pump controller for activematrix 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 (640k hz or 1.2mhz) current- mode regulator with an integrated 20v n-channel 0.2 mosfet that allows the us e of ultra-small inductors and ceramic capacitors. it prov ides fast transient re- sponse to pulsed loading while achieving efficiency over 90%. the device can produce output voltage as high as 18v from an input as low as 2.8v. soft-start is pro- grammed by external capac itor, which sets the in- put-current ramp-rate. the low-dropout (ldo) linear regu- lator can supply up to 350ma current while input voltage is 3.3v. it uses an internal 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 while power-on for achieving a corrected power-on sequence for gate driver ics. both of power-on delay time and the falling time of the gate-on voltage are programmable by external capacitor and resistor. the voltage detector monitors the supply voltage to issue a reset signal while the detected voltage is too low. the de- tecting level is decided by an external resistor divider and the delay time is programmable by an external capacitor. the vcom buffer can drive the lcd vcom voltage that features high short-circuit curr ent (150ma), fast slew rate (12v/ s), wide bandwidth (12mhz) and rail-to-rail in- put/output. the vgh charge pump controlle r provides regulated tft gate-on voltage. the regulat ion of the positive charge pump is generated by the internal comparator that senses the output voltage and co mpares it with an internal refer- ence. ordering information order number marking temp. range package (green) G5521r51u 5521 -40 c to 85 c tqfn4x4-24 note: r5: tqfn4x4-24 1: bonding code u: tape & reel pin configuration G5521 tqfn4x4-24 lx vin ss agnd adj ldoo avdd drvp fbp vgh vghm re 1 2 3 4 5 6 13 14 15 16 17 18 24 19 21 23 22 vflk 8 7 9 10 11 12 thermal pad vdpm cd reset vdiv ldoi opao opai comp fb freq pgnd 20 note: recommend connecting the thermal pad to the ground for excellent power dissipation. G5521 tqfn4x4-24 lx vin ss agnd adj ldoo avdd drvp fbp vgh vghm re 1 2 3 4 5 6 13 14 15 16 17 18 24 19 21 23 22 vflk 8 7 9 10 11 12 thermal pad vdpm cd reset vdiv ldoi opao opai comp fb freq pgnd 20 G5521 tqfn4x4-24 lx vin ss agnd adj ldoo avdd drvp fbp vgh vghm re 1 2 3 4 5 6 13 14 15 16 17 18 24 19 21 23 22 vflk 8 7 9 10 11 12 thermal pad vdpm cd reset vdiv ldoi opao opai comp fb freq pgnd 20 note: recommend connecting the thermal pad to the ground for excellent power dissipation.
ver: 0.2 nov 22, 2011 tel: 886-3-5788833 http://www.gmt.com.tw 1 G5521a global mixed-mode technology integrated multi-channel dc-dc converter for tft-lcd panels features ? 2.5v to 5.5v input supply range ? 640khz/1.2mhz current-mode boost regulator ? 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 ? high-performance operational amplifiers 150ma 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 ? adjustable falling time and power-on delay ? flicker compensator ? power-on sequence control ? charge pump for vgh regulation ? low voltage detector ? programmable detecting voltage and delay time ? thermal-overload protection ? rohs compliant ? tqfn4x4-24 package applications ? lcd monitor ? notebook computer displays ? lcd tvs general description the G5521a includes a high- performance boost regulator, a low dropout linear regulator (ldo), a gate pulse modula- tor (gpm), a voltage detector, a vcom buffer (unity-gain opa), and a vgh charge pump controller for activematrix 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 (640k hz or 1.2mhz) current- mode regulator with an integrated 20v n-channel 0.2 mosfet that allows the us e of ultra-small inductors and ceramic capacitors. it prov ides fast transient re- sponse to pulsed loading while achieving efficiency over 90%. the device can produce output voltage as high as 18v from an input as low as 2.8v. soft-start is pro- grammed by external capac itor, which sets the in- put-current ramp-rate. the low-dropout (ldo) linear regu- lator can supply up to 350ma current while input voltage is 3.3v. it uses an internal 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 while power-on for achieving a corrected power-on sequence for gate driver ics. both of power-on delay time and the falling time of the gate-on voltage are programmable by external capacitor and resistor. the voltage detector monitors the supply voltage to issue a reset signal while the detected voltage is too low. the de- tecting level is decided by an external resistor divider and the delay time is programmable by an external capacitor. the vcom buffer can drive the lcd vcom voltage that features high short-circuit curr ent (150ma), fast slew rate (12v/ s), wide bandwidth (12mhz) and rail-to-rail in- put/output. the vgh charge pump controlle r provides regulated tft gate-on voltage. the regulat ion of the positive charge pump is generated by the internal comparator that senses the output voltage and co mpares it with an internal refer- ence. ordering information order number marking temp. range package (green) G5521ar51u 5521 -40 c to 85 c tqfn4x4-24 note: r5: tqfn4x4-24 1: bonding code u: tape & reel pin configuration G5521a tqfn4x4-24 lx vin ss agnd adj ldoo avdd drvp fbp vgh vghm re 1 2 3 4 5 6 13 14 15 16 17 18 24 19 21 23 22 vflk 8 7 9 10 11 12 thermal pad vdpm cd reset vdiv ldoi opao opai comp fb freq pgnd 20 note: recommend connecting the thermal pad to the ground for excellent power dissipation. G5521a tqfn4x4-24 lx vin ss agnd adj ldoo avdd drvp fbp vgh vghm re 1 2 3 4 5 6 13 14 15 16 17 18 24 19 21 23 22 vflk 8 7 9 10 11 12 thermal pad vdpm cd reset vdiv ldoi opao opai comp fb freq pgnd 20 note: recommend connecting the thermal pad to the ground for excellent power dissipation.
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