파트넘버.co.kr G5524A 데이터시트 PDF


G5524A 반도체 회로 부품 판매점

Integrated Power Supply



Global Mixed-mode Technology 로고
Global Mixed-mode Technology
G5524A 데이터시트, 핀배열, 회로
Global Mixed-mode Technology Inc.
G5524A
Integrated Power Supply for TFT-LCD Panels with
4-Channel White LED Driver
Features
„ 2.5V to 5.5V Input Supply Range
„ Boost Regulator
Š 640kHz/1.2MHz Fixed Frequency
Š Current-Mode Control
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
„ White-LED Driver
Š Wide 4.2V to 24V Input Supply Range
Š Adjustable Switching Frequency
Š 40V/2A, 0.3Ω n-channel MOSFET
Š Input Under-Voltage Protection
Š Over Current Protection
Š Over Voltage Protection
Š Maximum Programmable LED Channel Current
50mA
Š Maximum 3% Matching between Channels
Š 100Hz~20kHz PWM Dimming
„ High-Performance Operational Amplifiers
Š ±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 Protection
„ RoHs Compliant
„ TQFN5X5-40 and TQFN3.8X6.2-44 Package
Applications
„ Notebook Computer Displays
„ UMPCs
„ LCD Monitor
General Description
The G5524A includes a high-performance boost regulator,
4-channel LED driver, 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 active-matrix thin-film transistor (TFT) liquid-crystal dis-
plays (LCDs).
The boost converter provides the regulated supply volt-
age for the panel source driver ICs. The converter is a
high switching frequency (640kHz or 1.2MHz) cur-
rent-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 re-
sponse 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 pro-
grammed by external capacitor, which sets the in-
put-current ramp-rate.
The LED driver automatically regulated supply voltage for
the LED light bars without the need to calculate the output
for different LED types. A FREQ2 pin is applied to adjust
switching frequency in the range of 640kHz to 2MHz. It
also integrates a 40V n-channel MOSFET that provides
high output power. The 4-channel current driver is ideal
for constant current driving, and, well matched less than
3%. To set the maximum driving current, the ISET pin is
used to determine reference current. Each channel of the
current drivers is set to 1300 times of this reference cur-
rent. A PWM pin can be used to perform PWM dimming
from the range of 100Hz to 20kHz. Open LED-string
automatically disable the channel from entering over
voltage protection.
The low-dropout (LDO) linear regulator can supply up to
350mA current while input voltage is 3.3V. It uses an inter-
nal PMOS as the pass device. It is suitable for the supply
voltage of the timing controller.
The GPM is controlled by frame signals from timing con-
troller 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 ca-
pacitor.
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 in-
put/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 refer-
ence.
Ver: 0.2
Feb 16, 2011
TEL: 886-3-5788833
http://www.gmt.com.tw
1


G5524A 데이터시트, 핀배열, 회로
Global Mixed-mode Technology Inc.
Ordering Information
ORDER
NUMBER
G5524ARG1U
G5524AK41U
Note: RG: TQFN5X5-40
1: Bonding Code
U: Tape & Reel
MARKING
5524
5524
K4: TQFN3.8X6.2-44
TEMP.
RANGE
-40°C to 85°C
-40°C to 85°C
Pin Configuration
G5524A
PACKAGE
(Green)
TQFN5X5-40
TQFN3.8X6.2-44
VGHM 1
VGH 2
FBP 3
DRVP 4
LDOO 5
ADJ 6
FB1 7
FREQ1 8
PGND 9
LX1 10
Thermal
Pad
(AGND)
30 ISET
29 LED4
28 LED3
27 LED2
26 LED1
25 OVP2
24 PGND
23 PGND
22 LX2
21 LX2
PGND 1
LX1 2
VIN1 3
LDOI 4
VDIV 5
SS1 6
COMP1 7
AGND1
FREQ2
8
9
EN2 10
PWM 11
VIN2 12
PGND 13
Thermal
Pad
(PGND)
35 PGND
34 VGHM
33 RE
32 VFLK
31 VDPM
30 CD
29 RESET
28 AVDD
27 OPAI
26 OPAO
25 AGND1
24 COMP2
23 PGND
G5524A TQFN5X5-40
G5524A TQFN3.8X6.2-44
Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation.
Ver: 0.2
Feb 16, 2011
TEL: 886-3-5788833
http://www.gmt.com.tw
2




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Integrated Power Supply - Global Mixed-mode Technology