G2511 Global Mixed-mode Technology Integrated Power Supply for TFT-LCD Panels with 6-Channel White LED Driver Features The boost converter provides the regulated supply voltage for the panel source driver ICs. The converter is a high switching frequency (1.2MHz) current-mode regulator with an integrated 20V N-Channel 0.2Ω MOSFET that allows the use of ultra-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. 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, 0.2Ω 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, 0.2Ω 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/µs 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 The LED driver automatically regulated supply voltage for the LED light bars without the need to calculate the output for different LED types. It also integrates a 40V n-channel MOSFET that provides high output power. The 6-channel current driver is ideal for constant current driving, and, well matched less than 3%. To set the maximum driving current, the ISET pin is used to determine reference current. 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, the 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 multiplied by ISET current when PWMB duty ≥ 25%. If the PWMB duty <25%, the ILED current is fixed at 0.25xISET, and the dimming duty is 4 x PWMB duty. Open LED-string automatically disable the channel from entering over voltage protection. The low-dropout (LDO) linear regulator 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 controller to modulate the Gate-On 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 time 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 detected voltage is too low. The detecting level is decided by an external resistor divider and the delay time is programmable by an external capacitor. Applications Notebook Computer Displays UMPCs LCD Monitor The VCOM buffer can drive the LCD VCOM voltage that features high short-circuit current (200mA), fast slew rate (12V/µs), wide bandwidth (12MHz) and rail-to-rail input/output. The gate-off linear regulator controller provides regulated TFT gate-off supplies using external charge pump attached to the switching node. Using the gate-low regulator after the produced negative voltage can regulate the exceeded voltage. General Description The G2511 includes a high-performance boost regulator, 6-channel LED driver, a low dropout linear regulator (LDO), a gate pulse modulator (GPM), a voltage detector, a VCOM buffer (unity-gain OPA), and a VGL linear regulator for active-matrix thin-film transistor (TFT) liquid-crystal displays (LCDs). TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.1 Oct 25, 2013 1 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 CS6 COMP FB SS 33 31 32 CD VDIV 35 34 FBN DRVN 38 36 VREF 39 37 AGND RESET 40 Pin Configuration 1 30 CS5 2 29 LX PGND CS4 3 28 VIN CS3 4 27 LDOI CS2 5 26 LDOO Thermal Pad 17 18 19 20 VFLK RE VGHM VGH 21 16 10 PWMB LXB 14 22 15 9 ENB PGNDB ENA OPAO OPAI AVDD ISETB 23 13 8 12 OVPB VCC ADJ 24 VCOMPB 25 7 11 6 VINB CS1 MODE G2511 TQFN5X5-40 Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation. TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.1 Oct 25, 2013 2