ver: 0.1 aug 22, 2013 tel: 886-3-5788833 http://www.gmt.com.tw 1 G2523 global mixed-mode technology integrated lcd bias power supply features ? 2.6v~5.5v supply range ? current mode boost regulator for avdd ? 0.15 ? /20v/3a embedded nmos switch ? fixed 1.2mhz switching frequency ? up to 85% efficiency ? 1% output regulation ? voltage mode buck-boost regulator for v gl ? fixed 600khz switching frequency ? up to 85% efficiency ? 1% output regulation ? charge pump regulator for vgh ? 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 ? protections: ? input under voltage lockout (uvlo) ? over current protection for avdd (ocp) ? output under voltage protection for avdd, vgh and vgl (uvp) ? output over voltage protection for avdd, vgl (ovp) ? operational amplifier short circuit protection (scp) ? over temperature protection (otp) ? qfn5x5-32 package ? rohs compliant applications ? lcd tv panel ? lcd monitor panel general description the G2523 includes a high-performance boost regulator, a buck-boost controller, a high voltage charge pump regulator, 3 vcom buffers (unity-gain opa) 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/0.15 ? 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 other devices. 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 G2523 features extensive protection functions that include uvlo, ocp, uvp, ovp, and otp. it is available in a qfn5x5-32 package. ordering information order number marking temp. range package (green) G2523qa1u 2523 -40 c to +85 c qfn5x5-32 note: qa: qfn5x5-32 1: bonding code u: tape & reel
ver: 0.1 aug 22, 2013 tel: 886-3-578833 http://www.gmt.com.tw 2 G2523 global mixed-mode technology pin configuration typical application circuit G2523 qfn5x5-32 1 2 3 4 5 6 18 19 20 21 22 23 30 25 26 27 29 28 9 10 11 12 thermal pad 7 13 14 17 31 8 15 16 24 32 avin opao3 opai3 opao2 opai2 opao1 opai1 fbp vref ntc end drvn nc comp2 fbn sw1 sw1 pgnd pgnd fb comp1 agnd drvp ognd nc nc vgl flt pu vdts vref vsup note: recommend c onnecting the thermal pad to the gr ound for excellent power dissipation. G2523 qfn5x5-32 1 2 3 4 5 6 18 19 20 21 22 23 30 25 26 27 29 28 9 10 11 12 thermal pad 7 13 14 17 31 8 15 16 24 32 avin opao3 opai3 opao2 opai2 opao1 opai1 fbp vref ntc end drvn nc comp2 fbn sw1 sw1 pgnd pgnd fb comp1 agnd drvp ognd nc nc vgl flt pu vdts vref vsup note: recommend c onnecting the thermal pad to the gr ound for excellent power dissipation.
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