G5561A/B

Global Mixed-mode Technology Inc.
G5561A
Quad-Output TFT LCD Bias DC-DC Converter
General Description
Features
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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