G5521/A

G5521
Global Mixed-mode Technology Inc.
Integrated Multi-Channel DC-DC Converter for TFT-LCD Panels
high switching frequency (640kHz or 1.2MHz) currentmode 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
18V from an input as low as 2.8V. Soft-Start is programmed by external capacitor, which sets the input-current ramp-rate. 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.
Features
„ 2.5V to 5.5V Input Supply Range
„ 640kHz/1.2MHz Current-Mode Boost Regulator
Š Fast Transient Response to Pulse Load
Š ±1% Accurate Output Voltage
Š Built-In 20V/2A, 0.2Ω N-Channel MOSFET
Š High Efficiency up to 90%
Š Programmable Soft-Start
Š Over-Current Protection
Š Output Under-Voltage Protection
„ High-Performance Operational Amplifiers
±150mA Output Short-Circuit Current
Š 12V/µs Slew Rate
Š 12MHz, -3dB Bandwidth
Š Rail-to-Rail Input and Output
„ Low Dropout Voltage Linear Regulator
Š 350mA Maximum Output Current
Š Adjustable Output Voltage
„ On-Chip GPM Controller
Š Adjustable Falling Time and Power-On Delay
Š Flicker Compensator
Š Power-On Sequence Control
„ Charge pump for VGH regulation
„ Low Voltage Detector
Š Programmable Detecting Voltage and Delay Time
„ Thermal-Overload Protection
„ RoHs Compliant
„ TQFN4X4-24 Package
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 while power-on for achieving a corrected
power-on sequence for gate driver ICs. Both of power-on
delay time and the falling time of the Gate-On voltage are
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.
The VCOM buffer can drive the LCD VCOM voltage that
features high short-circuit current (150mA), fast slew rate
(12V/µs), wide bandwidth (12MHz) and rail-to-rail input/output.
Applications
The VGH charge pump controller provides regulated TFT
Gate-On voltage. The regulation of the positive charge
pump is generated by the internal comparator that senses
the output voltage and compares it with an internal reference.
„ LCD Monitor
„ Notebook Computer Displays
„ LCD TVs
General Description
Ordering Information
The G5521 includes a high-performance boost regulator, a
low dropout linear regulator (LDO), a gate pulse modulator
(GPM), a voltage detector, a VCOM buffer (unity-gain OPA),
and a VGH charge pump controller for activematrix thin-film
transistor (TFT) liquid-crystal displays (LCDs).
PACKAGE
(Green)
G5521R51U
5521
-40°C to 85°C
TQFN4X4-24
FB
COMP
OPAI
OPAO
21
20
19
FREQ
23
TEMP.
RANGE
22
PGND
24
MARKING
Note: R5: TQFN4X4-24
1: Bonding Code
U: Tape & Reel
The boost converter provides the regulated supply voltage for the panel source driver ICs. The converter is a
Pin Configuration
ORDER
NUMBER
LX
1
18
AVDD
VIN
2
17
DRVP
16
FBP
15
VGH
SS
3
AGND
4
ADJ
5
14
VGHM
6
13
RE
12
VFLK
VDPM 11
10
CD
8
9
VDIV
RESET
LDOI
7
LDOO
Thermal
Pad
G5521 TQFN4X4-24
Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation.
Ver: 0.9
Jul 21, 2010
TEL: 886-3-5788833
http://www.gmt.com.tw
1
G5521A
Global Mixed-mode Technology
Integrated Multi-Channel DC-DC Converter for TFT-LCD Panels
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
18V from an input as low as 2.8V. Soft-Start is programmed by external capacitor, which sets the input-current ramp-rate. 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.
Features
„ 2.5V to 5.5V Input Supply Range
„ 640kHz/1.2MHz Current-Mode Boost Regulator
Š Fast Transient Response to Pulse Load
Š ±1% Accurate Output Voltage
Š Built-In 20V/2A, 0.2Ω N-Channel MOSFET
Š High Efficiency up to 90%
Š Programmable Soft-Start
Š Over-Current Protection
Š Output Under-Voltage Protection
„ High-Performance Operational Amplifiers
±150mA Output Short-Circuit Current
Š 12V/µs Slew Rate
Š 12MHz, -3dB Bandwidth
Š Rail-to-Rail Input and Output
„ Low Dropout Voltage Linear Regulator
Š 350mA Maximum Output Current
Š Adjustable Output Voltage
„ On-Chip GPM Controller
Š Adjustable Falling Time and Power-On Delay
Š Flicker Compensator
Š Power-On Sequence Control
„ Charge pump for VGH regulation
„ Low Voltage Detector
Š Programmable Detecting Voltage and Delay Time
„ Thermal-Overload Protection
„ RoHs Compliant
„ TQFN4X4-24 Package
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 while power-on for achieving a corrected
power-on sequence for gate driver ICs. Both of power-on
delay time and the falling time of the Gate-On voltage are
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.
The VCOM buffer can drive the LCD VCOM voltage that
features high short-circuit current (150mA), fast slew rate
(12V/µs), wide bandwidth (12MHz) and rail-to-rail input/output.
The VGH charge pump controller provides regulated TFT
Gate-On voltage. The regulation of the positive charge
pump is generated by the internal comparator that senses
the output voltage and compares it with an internal reference.
Applications
„ LCD Monitor
„ Notebook Computer Displays
„ LCD TVs
Ordering Information
General Description
The G5521A includes a high-performance boost regulator,
a low dropout linear regulator (LDO), a gate pulse modulator (GPM), a voltage detector, a VCOM buffer (unity-gain
OPA), and a VGH charge pump controller for activematrix
thin-film transistor (TFT) liquid-crystal displays (LCDs).
PACKAGE
(Green)
G5521AR51U
5521
-40°C to 85°C
TQFN4X4-24
FB
COMP
OPAI
OPAO
21
20
19
FREQ
23
TEMP.
RANGE
22
PGND
24
MARKING
Note: R5: TQFN4X4-24
1: Bonding Code
U: Tape & Reel
The boost converter provides the regulated supply voltage for the panel source driver ICs. The converter is a
high switching frequency (640kHz or 1.2MHz) current-
Pin Configuration
ORDER
NUMBER
LX
1
18
AVDD
VIN
2
17
DRVP
16
FBP
15
VGH
SS
3
AGND
4
ADJ
5
14
VGHM
LDOO
6
13
RE
12
VFLK
RESET
VDPM 11
9
10
8
CD
7
LDOI
VDIV
Thermal
Pad
G5521A TQFN4X4-24
Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation.
Ver: 0.2
Nov 22, 2011
TEL: 886-3-5788833
http://www.gmt.com.tw
1