Global Mixed-mode Technology Inc. G5561A Quad-Output TFT LCD Bias DC-DC Converter General Description Features The G5561A DC-DC converter provides regulated voltages required by thin-film transistor (TFT) liquid crystal displays (LCD) panels in TSSOP package. One step-up converter, one step-down converter, and two charge pumps convert the 8V to 14V input voltage into four output voltages. These features complete the powersupply requirements of large screen LCD panels. The step-up converter provides source voltages VS and the step-down converter provides logic voltage for the system. The dual charge pumps independently generate adjustable regulated output voltages VGL and VGH to bias the LCD. These four blocks operate with a fixed switching frequency of 500kHz or 750kHz. 8V to 14V Input Voltage Range VS Output Voltage Range up to 19 V 1% Accurate Boost Converter with 3A Switch Current 1.5% Accurate 2.3A Step-Down Converter 500kHz/750kHz Fixed Switching Frequency 150mA Negative Charge Pump Driver for VGL 150mA Positive Charge Pump Driver for VGH Adjustable Sequencing for VGL, VGH Gate Drive Signal to Drive External MOSFET Internal and Adjustable Soft Start Cycle-by-Cycle Over Current Protection Short-Circuit Protection Overvoltage Protection Thermal Shutdown Available in TSSOP-28 Package Both step-up and step-down converters operate in asynchronous switch mode. Current mode control provides fast transient response and eases loop stabilization. Fault protection includes cycle-by-cycle current limit, thermal shutdown, overvoltage protection of the step-up converter and short-circuit protection of the step-down converter. Current mode control is used for both charge pumps to regulate its output voltage, which minimizes output ripple and capacitor sizes. Applications TFT LCD Displays The G5561A is available in an 28-pin TSSOP package. Ordering Information ORDER NUMBER G5561AF41U Note: F4: TSSP-28 (FD) 1: Bonding Code U: Tape & Reel MARKING TEMP. RANGE PACKAGE (Green) G5561A -40°C~ +85°C TSSOP-28 (FD) Pin Configuration G5561A FB 1 28 COMP 2 27 GD OS 3 26 DLY2 SW 4 25 DLY1 SW 5 24 REF PGND 6 23 GND PGND 7 SUP 8 Thermal Pad SS 22 AVIN 21 VINB EN2 9 20 VINB DRP DRN 10 19 18 NC SWB FREQ FBN 12 13 17 NC 16 EN1 FBP 14 15 FBB 11 TSSOP-28 (FD) Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation. TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.2 Mar 22, 2011 1 G5561B Global Mixed-mode Technology Quad-Output TFT LCD Bias DC-DC Converter General Description Features The G5561B DC-DC converter provides regulated voltages required by thin-film transistor (TFT) liquid crystal displays (LCD) panels in TSSOP package. One step-up converter, one step-down converter, and two charge pumps convert the 8V to 14V input voltage into four output voltages. These features complete the powersupply requirements of large screen LCD panels. The step-up converter provides source voltages VS and the step-down converter provides logic voltage for the system. The dual charge pumps independently generate adjustable regulated output voltages VGL and VGH to bias the LCD. These four blocks operate with a fixed switching frequency of 500kHz or 750kHz. 8V to 14V Input Voltage Range VS Output Voltage Range up to 19 V 1% Accurate Boost Converter with 3A Switch Current 2% Accurate 2.3A Step-Down Converter 500kHz/750kHz Fixed Switching Frequency 150mA Negative Charge Pump Driver for VGL 150mA Positive Charge Pump Driver for VGH Adjustable Sequencing for VGL, VGH Gate Drive Signal to Drive External MOSFET Internal and Adjustable Soft Start Cycle-by-Cycle Over Current Protection Short-Circuit Protection Overvoltage Protection Thermal Shutdown Available in TSSOP-28 Package Both step-up and step-down converters operate in asynchronous switch mode. Current mode control provides fast transient response and eases loop stabilization. Fault protection includes cycle-by-cycle current limit, thermal shutdown, overvoltage protection of the step-up converter and short-circuit protection of the step-down converter. Current mode control is used for both charge pumps to regulate its output voltage, which minimizes output ripple and capacitor sizes. Applications TFT LCD Displays The G5561B is available in an 28-pin TSSOP package. Ordering Information ORDER NUMBER G5561BF41U Note: F4: TSSP-28 (FD) 1: Bonding Code U: Tape & Reel MARKING TEMP. RANGE PACKAGE (Green) G5561B -40°C~ +85°C TSSOP-28 (FD) Pin Configuration G5561B FB 1 28 COMP 2 27 GD OS 3 26 DLY2 SW 4 25 DLY1 SW PGND 5 24 REF 6 23 GND PGND 7 SUP 8 Thermal Pad SS 22 AVIN 21 VINB EN2 9 20 VINB DRP DRN 10 19 18 NC SWB FREQ FBN 12 13 17 NC 16 EN1 FBP 14 15 FBB 11 TSSOP-28 (FD) Recommend connecting the Thermal Pad to the Ground for excellent power dissipation. TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.3 Aug 08, 2012 1