G2561

G2561
Global Mixed-mode Technology
Programmable Multi-Output TFT LCD Bias Power
Applications
Features
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Input Supply Range: 8V ~ 14V
Current Mode Sync-Boost Converter for AVDD
¾ Fixed 750kHz Switching Frequency
¾ 2.2A to 5A Programmable Current Limit
¾ 13.5V to 19.8V Programmable Output
¾ Integrated 20V/0.1Ω Switching N-MOSFET
Buck Converter for VLOGIC
¾ Fixed 750kHz Switching Frequency
¾ 2.2V to 3.7V Programmable Output
¾ Integrated 12V/0.2Ω Switching N-MOSFET
Positive Charge-Pump Regulator for VGH
¾ 20V to 35V Programmable Output
¾ Thermal Compensation
Negative Charge-Pump Regulator for VGL
¾ -4.5V to -13.5V Programmable Output
Built-in Power-On Sequence and Soft-Start
Function
Isolation Switching PMOS for AVDD
Protection Function
¾ Input Under Voltage Lockout (UVLO)
¾ Over-Temperature Protection (OTP)
¾ Over-Voltage Protection (OVP)
¾ Over-Current Protection (OCP)
¾ Output Under Voltage Protection (UVP)
¾ Short Circuit Protection (SCP)
2-Wire I2C Slave Mode Interface
Available in QFN6X6-40 Package
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TFT LCD Displays
General Description
The G2561 DC-DC converter provides regulated voltages required by thin-film transistor (TFT) liquid crystal
displays (LCD) panels in QFN6X6-40 package. One
synchronous step-up converter, one asynchronous
step-down converter, and two charge pumps regulators
convert the 8V to 14V input voltage into four output
voltages with 1 channel OPAMP. These features complete the power- supply requirements of large screen
LCD panels. The step-up converter provides source
voltages VAVDD and the step-down converter provides
logic voltage VLOGIC for the system. The dual charge
pumps regulators independently generate adjustable
regulated output voltages VGL and VGH to bias the
LCD using external charge pump attached to the
switching node. The step-up converter and step-down
converter operate with a fixed switching frequency of
750kHz, and all output are programmable.
The G2561 is available in a 40-pin QFN (6mm x 6mm)
package.
Ordering Information
ORDER
NUMBER
MARKING
TEMP.
RANGE
PACKAGE
(Green)
2561
-40°C to 85°C
QFN6X6-40
G2561QG1U
Note: QG: QFN6X6-40
1: Bonding Code
U: Tape & Reel
31 POS
33 EN
32 VSUP
35 VGHM
34 VGH
36 RE
37 OUTB1
38 LXB1
BOOT1
40
39 LXB1
Pin Configuration
VINB1
1
30 NEG
VINB1
2
29 OP_OUT
AVIN
3
28 OGND
AGND
4
27
SDA
5
SCL
6
A0
HVS
Thermal
Pad
Pad
NC
26
VFLK
25
A1
7
24
NC
8
23 DRVP
XAO
9
22 NC
COMP
10
13
14
15
16
17
18
19
20
PGND
LX
LX
LXI
LXO
LXO
VGL
12
PGND
11
VL
NTC
21 DRVN
G2561 QFN6X6-40
Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation.
Ver: 0.1
Sep 09, 2013
TEL: 886-3-5788833
http://www.gmt.com.tw
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