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LT1943_1

Description
High Current Quad Output Regulator for TFT LCD Panels
File Size269KB,20 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet Compare View All

LT1943_1 Overview

High Current Quad Output Regulator for TFT LCD Panels

LT1943
High Current Quad Output
Regulator for TFT LCD Panels
FEATURES
DESCRIPTIO
4 Integrated Switches: 2.4A Buck, 2.6A Boost,
0.35A Boost, 0.35A Inverter (Guaranteed Minimum
Current Limit)
Fixed Frequency, Low Noise Outputs
Soft-Start for all Outputs
Externally Programmable V
ON
Delay
Integrated Schottky Diode for V
ON
Output
PGOOD Pin for AV
DD
Output Disconnect
4.5V to 22V Input Voltage Range
PanelProtect
TM
Circuitry Disables V
ON
Upon Fault
Available in Thermally Enhanced 28-Lead TSSOP
APPLICATIO S
Large TFT-LCD Desktop Monitors
Flat Panel Televisions
The LT
®
1943 quad output adjustable switching regulator
provides power for large TFT LCD panels. The device,
housed in a low profile 28 pin thermally enhanced TSSOP
package, can generate a 3.3V or 5V logic supply along with
the triple output supply required for the TFT LCD panel.
Operating from an input range of 4.5V to 22V, a step-down
regulator provides a low voltage output V
LOGIC
with up to
2A current. A high-power step-up converter, a lower-
power step-up converter and an inverting converter pro-
vide the three independent output voltages AV
DD
, V
ON
and
V
OFF
required by the LCD panel. A high-side PNP provides
delayed turn-on of the V
ON
signal and can handle up to
30mA. Protection circuitry ensures that V
ON
is disabled if
any of the four outputs are more than 10% below the
programmed voltage.
All switchers are synchronized to an internal 1.2MHz
clock, allowing the use of low profile inductors and ce-
ramic capacitors throughout. A current mode architecture
provides excellent transient response. For best flexibility,
all outputs are adjustable. Soft-start is included in all four
channels. A PGOOD pin can drive an optional PMOS pass
device to provide output disconnect for the AV
DD
output.
, LTC and LT are registered trademarks of Linear Technology Corporation.
PanelProtect is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
V
OFF
–5.5V
50mA
2.2µF
44.2k
SW4
NFB4
10.0k
10pF
10µH
FB4
BIAS
BOOST
0.22µF
4.7µH
V
LOGIC
3.3V
2A
16.2k
FB1
10.0k
22µF
18k
100pF
2.2nF
V
C1
V
C2
SW1
V
IN
V
IN,
8V TO 20V
0.47µF
10µF
10µH
1µF
33µH
AV
DD
12.2V
500mA
10µH
88.7k
10µF
SW3
SW2
FB2
RUN-SS
SS-234
0.015µF
0.015µF
0.047µF
PGOOD
10.0k
LT1943
C
T
PGOOD
V
ON
E3
V
ON
35V
30mA
274k
RUN-SS
2V/DIV
V
LOGIC
5V/DIV
AV
DD
10V/DIV
V
OFF
10V/DIV
V
E3
20V/DIV
V
ON
50V/DIV
I
IN(AVG)
1A/DIV
5ms/DIV
FB3
GND
SGND
V
C4
10.0k
2.2µF
V
C3
6.8k
100pF
2.2nF
27k
100pF
680pF
13k
100pF
2.2nF
0.47µF
Quad Output TFT-LCD Power Supply
1943 TA01
U
Startup Waveforms
1943fa
U
U
1

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Description High Current Quad Output Regulator for TFT LCD Panels High Current Quad Output Regulator for TFT LCD Panels High Current Quad Output Regulator for TFT LCD Panels
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