G2521 Datasheet, PDF (1/2 Pages) Global Mixed-mode Technology Inc – Integrated LCD Bias Power Supply with Level Shifter

Global Mixed-mode Technology
G2521
Integrated LCD Bias Power Supply with Level Shifter
Features
„ 2.6V~5.5V Supply Range
„ Current Mode Boost Regulator for AVDD
Š 0.1Ω/20V/3A Embedded NMOS switch
Š Fixed 1.2MHz Switching Frequency
Š Up to 85% Efficiency
Š 1% Output Regulation
„ Voltage Mode Buck-Boost Regulator for VGOFF
Š Fixed 600kHz Switching Frequency
Š Up to 85% Efficiency
Š 1% Output Regulation
„ Charge Pump Regulator for VGON
„ 3-Channel Rail-to-Rail Unity-Gain Operational
Amplifier
Š ±200mA Output Short Circuit Current
Š 20V/µs Slew Rate
Š 18MHz, -3dB Bandwidth
„ Built-In Power On Sequence and Soft Start
Function
„ 7-Channel Level Shifter
Š +33V Highest Voltage Level
Š -30V Lowest Voltage Level
Š Maximum 1µs Rising/Falling Time
Š 300mA Peak Current
Š 15mA Continuous Current
Š Adjustable Gate Shading Function
„ Opened Drain Pull High VGLC Signal
„ Protections:
Š Input Under Voltage Lockout (UVLO)
Š Over Current Protection for AVDD (OCP)
Š Output Under Voltage Protection for AVDD,
GON and GOFF (UVP)
Š Output Over Voltage Protection for AVDD,
GON and GOFF (OVP)
Š Operational Amplifier Short Circuit Protection
(SCP)
Š Over Temperature Protection (OTP)
„ TQFN6x6-48L Package
„ RoHS Compliant
Applications
„ LCD TV Panel
„ LCD Monitor Panel
General Description
The G2521 includes a high-performance boost regulator,
a buck-boost controller, a high voltage charge pump
regulator, 3 VCOM buffers (unity-gain OPA), open-drain
pull high VGLC signal generator and 7-channel level
shifter with adjustable gate shading function for ac-
tive-matrix thin-film transistor (TFT) liquid-crystal dis-
plays (LCDs).
The boost regulator provides the regulated supply
voltage for the panel source driver ICs. It is a high
switching frequency (1.2MHz) current-mode regulator
with an integrated 20V/0.1Ω NMOS switch that al-
lows the use of ultra small inductors and ceramic ca-
pacitors. It provides fast transient response to pulsed
loading while achieving efficiency over 85%. The de-
vice can produce output voltage as high as 18V from
an input as low as 2.8V.
A voltage mode buck-boost controller cooperates with
external temperature sensor provide compensated
gate-off voltage supply to the level shifters. While the
charge pump controller regulates the external charge
pump voltage source to supply for the level shifters.
The level shifters transform the logic-level control sig-
nals generated by the display timing controller (TCON)
into the high-level signals needed by LCD panel. Each
channel of level shifter output uses low impedance tran-
sistors to achieve fast rising and falling time, even when
driving the capacitive loads present in LCD applications.
Channel 1 to 6 supports gate voltage shading. They are
organized in two groups, each with its own shading dis-
charge resistor output. External R-C timer defines
shading period though the DTS input.
The VCOM buffer can drive the LCD VCOM voltage
that features high short-circuit current (200mA), fast
slew rate (20V/µs), wide bandwidth (8MHz) and
rail-to-rail input/output.
The G2521 features extensive protection functions
that include UVLO, OCP, UVP, OVP, SCP and OTP. It
is available in a TQFN6x6-48L package.
Ordering Information
ORDER
NUMBER
G2521RP1U
Note: RP: TQFN6x6-48
1: Bonding Code
U: Tape & Reel
MARKING
2521
TEMP.
RANGE
-40°C to +85°C
PACKAGE
(Green)
TQFN6X6-48
Ver: 0.1
Oct 28, 2013
TEL: [phone]
http://www.gmt.com.tw
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