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LT1943 Datasheet

  • LT1943

  • High Current Quad Output Regulator for TFT LCD Panels

  • 273.20KB

  • 12頁

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Final Electrical Specifications
LT1943
High Current Quad Output
Regulator for TFT LCD Panels
FEATURES
s
DESCRIPTIO
September 2003
s
s
s
s
s
s
s
s
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
Thermally Enhanced 28-Lead TSSOP
APPLICATIO S
s
s
Large TFT-LCD Desktop Monitor Displays
Flat Panel Televisions
The LT
廬
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 V
ON
is disabled if any
of the four outputs are more than 10% below normal
voltage.
All switchers are synchronized to the 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.
PannelProtect is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
V
OFF
鈥?0V
50mA
2.2碌F
ZHCS400
V
IN,
8V TO 20V
0.47碌F
16V
80.6k
ZHCS400
SW4
NFB4
10.0k
10pF
10碌H
FB4
BIAS
BOOST
CMDSH-3
16.2k
0.22碌F
10V
SW1
V
IN
10碌F
10碌H
1碌F
25V
B240A
AV
DD
13V
500mA
95.3k
10碌F
33碌H
10碌H
SW3
SW2
FB2
RUN-SS
SS-234
C
T
PGOOD
V
ON
E3
232k
FB3
PGOOD
0.015碌F
0.015碌F
0.047碌F
10.0k
LT1943
V
ON
30V
30mA
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
V
LOGIC
3.3V
2A
4.7碌H
B230A
FB1
10.0k
22碌F
27.4k
100pF
2.2nF
6.81k
VC1
VC2
VC3
GND
SGND
VC4
10.0k
2.2碌F
100pF
2.2nF
47.5k
100pF
680pF
13k
100pF
2.2nF
0.47碌F
Figure 1. Quad Output TFT-LCD Power Supply
1943 F01
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
U
U
U
Startup Waveforms
1943i
1

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