G2521 Global Mixed-mode Technology Integrated LCD Bias Power Supply with Level Shifter Features General Description 2.6V~5.5V Supply Range 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 active-matrix thin-film transistor (TFT) liquid-crystal displays (LCDs). Current Mode Boost Regulator for AVDD 0.1Ω/20V/3A Embedded NMOS switch Fixed 1.2MHz Switching Frequency Up to 85% Efficiency 1% Output Regulation Voltage Mode Buck-Boost Regulator for VGOFF Fixed 600kHz Switching Frequency The boost regulator provides the regulated supply voltage for the panel source driver ICs. It is a high switching frequency (1.2MHz) current-mode regulator with an integrated 20V/0.1Ω NMOS switch that allows the use of ultra small inductors and ceramic capacitors. It provides fast transient response to pulsed loading while achieving efficiency over 85%. The device can produce output voltage as high as 18V from an input as low as 2.8V. Up to 85% Efficiency 1% Output Regulation Charge Pump Regulator for VGON 3-Channel Rail-to-Rail Unity-Gain Operational Amplifier ±200mA Output Short Circuit Current 20V/µs 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 1µs 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, GON and GOFF (UVP) Output Over Voltage Protection for AVDD, GON and GOFF (OVP) Operational Amplifier Short Circuit Protection (SCP) Over Temperature Protection (OTP) TQFN6x6-48L Package RoHS Compliant 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 signals 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 transistors 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 discharge 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/µs), 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. Applications LCD TV Panel LCD Monitor Panel Ordering Information ORDER NUMBER G2521RP1U Note: RP: TQFN6x6-48 1: Bonding Code U: Tape & Reel MARKING TEMP. RANGE PACKAGE (Green) 2521 -40°C to +85°C TQFN6X6-48 TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.1 Oct 28, 2013 1 G2521 Global Mixed-mode Technology COMP1 AGND DRVP FBP REF2 NC 40 39 38 37 FB 43 41 PGND 44 42 LX1 PGND 45 LX1 46 VIN 48 47 Pin Configuration OPAS 1 36 VT OUT3 2 35 END POS3 3 34 LX2 OUT2 4 33 COMP2 POS2 5 OUT1 6 POS1 7 Thermal Pad 32 FBN 31 REF2 30 GON 21 22 23 24 CKH2 CKH1 STH 20 CKH4 CKH3 19 GOFF CKH5 25 17 12 18 CK2 CKH6 RO VGLC DTS 26 16 27 11 RE 10 CK3 15 CK4 CK6 VDTS 14 AGND 28 13 29 9 ST 8 CK5 CK1 OGND G2521 TQFN6X6-48 Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation. Typical Application Circuit G2521 TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.1 Oct 28, 2013 2