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Global Mixed-mode Technology - Bias Power Supply

Numéro de référence G5562
Description Bias Power Supply
Fabricant Global Mixed-mode Technology 
Logo Global Mixed-mode Technology 





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G5562 fiche technique
Global Mixed-mode Technology Inc.
G5562
Bias Power Supply with High-Speed Amplifier and
High-Accuracy LDO for LCD TVs
Features
„ 8V to 14V Input Voltage Range
„ 500kHz/750kHz Fixed Switching Frequency
„ VS Step-Up Converter
‹ Current Mode
‹ 1% Feedback Accuracy
‹ Output Voltage Range up to 20V
‹ 3A Switch Current
‹ Adjustable Soft Start
‹ Adjustable Current Limit
„ VLOGIC Step-Down Converter
‹ Current Mode
‹ 1% Feedback Accuracy
‹ 2.5A Switch Current
‹ 2.5ms Internal Soft Start
„ 150mA Negative Charge Pump Driver for VGL
„ 150mA Positive Charge Pump Driver for VGH
„ Integrated High Voltage Switch for Gate Volt-
age Shaping
„ High Voltage LDO for VREF
‹ 0.5% Feedback Accuracy
‹ 0.5V Dropout at 60mA Output Current
„ High-Speed Operational Amplifier
‹ 20MHz -3dB Bandwidth
‹ 45 V/µs Slew Rate
‹ ±200-mA Short-Circuit Current
„ Gate Drive Signal to Drive External MOSFET
„ XAO Comparator
„ Thermal Shutdown
„ Available in 7mmx7mm 48-pin TQFN Package
Applications
„ LCD TV Panels
Ordering Information
ORDER
NUMBER
G5562R11U
Note: R1: TQFN7X7-48
1: Bonding Code
U: Tape & Reel
MARKING
5562
General Description
The G5562 DC-DC converter provides regulated volt-
ages required by thin-film transistor (TFT) liquid crystal
displays (LCD) panels in TQFN 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 power-
supply requirements of large screen LCD panels. The
step-up converter provides source voltages VS and the
step-down converter provides logic voltage for the sys-
tem. 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.
Both step-up and step-down converters operate in
asynchronous switch mode. Current mode control pro-
vides fast transient response and eases loop stabiliza-
tion. Fault protection includes cycle-by-cycle current
limit, thermal shutdown, and output-fault shutdown.
Current mode control is used for both charge pumps to
regulate its output voltage, which minimizes output
ripple and capacitor sizes. High voltage switch is used
for gate voltage shaping to improve TFT-LCD display
quality.
The G5562 includes one high-speed high-current op-
erational amplifier and one high-accuracy LDO for
Gamma buffer reference.
The G5562 is available in a 48-pin TQFN package.
TEMP.
RANGE
-40°C~ +85°C
PACKAGE
(Green)
TQFN7X7-48
Ver: 0.2
Mar 03, 2011
TEL: 886-3-5788833
http://www.gmt.com.tw
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