ver: 0.1 oct 28, 2013 tel: 886-3-5788833 http://www.gmt.com.tw 1 G2521 global mixed-mode technology integrated lcd bias power supply with level shifter features ? 2.6v~5.5v supply range ? current mode boost regulator for avdd ? 0.1 ? /20v/3a embedded nmos switch ? fixed 1.2mhz switching frequency ? up to 85% efficiency ? 1% output regulation ? voltage mode buck-boost regulator for v goff ? fixed 600khz switching frequency ? up to 85% efficiency ? 1% output regulation ? charge pump regulator for v gon ? 3-channel rail-to-rail unity-gain operational amplifier ? 200ma output short circuit current ? 20v/s slew rate ? 18mhz, -3db bandwidth ? built-in power on sequence and soft start function ? 7-channel level shifter ? +33v highest voltage level ? -30v lowest voltage level ? maximum 1s rising/falling time ? 300ma peak current ? 15ma continuous current ? adjustable gate shading function ? opened drain pull high vglc signal ? protections: ? input under voltage lockout (uvlo) ? over current protection for avdd (ocp) ? output under voltage protection for avdd, g on and g off (uvp) ? output over voltage protection for avdd, g on and g off (ovp) ? operational amplifier short circuit protection (scp) ? over temperature protection (otp) ? tqfn6x6-48l package ? rohs compliant applications ? lcd tv panel ? lcd monitor panel general description the G2521 includes a high-performance boost regulator, a buck-boost controller, a high voltage charge pump regulator, 3 vcom buffers (unity-gain opa), open-drain pull high vglc signal generator and 7-channel level shifter with adjustable gate shading function for ac- tive-matrix thin-film transistor (tft) liquid-crystal dis- plays (lcds). the boost regulator provides the regulated supply voltage for the panel source driver ics. it is a high switching frequency (1.2mhz) current-m ode regulator with an integrated 20v/0.1 ? nmos switch that al- lows the use of ultra small inductors and ceramic ca- pacitors. it provides fast transient response to pulsed loading while achieving efficiency over 85%. the de- vice can produce output voltage as high as 18v from an input as low as 2.8v. a voltage mode buck-boost controller cooperates with external temperature sensor provide compensated gate-off voltage supply to the level shifters. while the charge pump controller regulates the external charge pump voltage source to supply for the level shifters. the level shifters transform the logic-level control sig- nals generated by the display timing controller (tcon) into the high-level signals needed by lcd panel. each channel of level shifter output uses low impedance tran- sistors to achieve fast rising and falling time, even when driving the capacitive loads present in lcd applications. channel 1 to 6 supports gate voltage shading. they are organized in two groups, each with its own shading dis- charge resistor output. external r-c timer defines shading period though the dts input. the vcom buffer can drive the lcd vcom voltage that features high short-circuit current (200ma), fast slew rate (20v/s), wide bandwidth (8mhz) and rail-to-rail input/output. the G2521 features extensive protection functions that include uvlo, ocp, uvp, ovp, scp and otp. it is available in a tqfn6x6-48l package. ordering information order number marking temp. range package (green) G2521rp1u 2521 -40 c to +85 c tqfn6x6-48 note: rp: tqfn6x6-48 1: bonding code u: tape & reel
ver: 0.1 oct 28, 2013 tel: 886-3-5788833 http://www.gmt.com.tw 2 G2521 global mixed-mode technology pin configuration typical application circuit G2521 vt end lx2 comp2 fbn ref2 gon agnd vdts dts ro goff vglc ckh3 ck1 st ck6 re ckh6 ckh5 ckh4 ckh2 ckh1 sth opas out3 pos3 out2 pos2 out1 pos1 ognd ck5 ck4 ck3 ck2 vin lx1 lx1 pgnd pgnd fb comp1 agnd drvp fbp nc 1 2 3 4 5 6 7 8 9 10 11 12 25 26 27 28 29 30 31 32 33 34 35 36 13 14 15 16 17 18 19 20 21 22 23 24 48 43 42 41 40 39 38 37 44 45 47 46 ref2 thermal pad note: recommend connecting the thermal pad to the ground for excellent power dissipation. G2521 tqfn6x6-48 vt end lx2 comp2 fbn ref2 gon agnd vdts dts ro goff vglc ckh3 ck1 st ck6 re ckh6 ckh5 ckh4 ckh2 ckh1 sth opas out3 pos3 out2 pos2 out1 pos1 ognd ck5 ck4 ck3 ck2 vin lx1 lx1 pgnd pgnd fb comp1 agnd drvp fbp nc 1 2 3 4 5 6 7 8 9 10 11 12 25 26 27 28 29 30 31 32 33 34 35 36 13 14 15 16 17 18 19 20 21 22 23 24 48 43 42 41 40 39 38 37 44 45 47 46 ref2 thermal pad note: recommend connecting the thermal pad to the ground for excellent power dissipation. G2521 tqfn6x6-48
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