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參數(shù)資料
| 型號： | LT1943EFE |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | High Current Quad Output Regulator for TFT LCD Panels |
| 中文描述： | 4.3 A SWITCHING REGULATOR, 1460 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封裝： | 4.4 MM, PLASTIC, TSSOP-28 |
| 文件頁數(shù)： | 1/12頁 |
| 文件大小： | 279K |
| 代理商： | LT1943EFE |
LT1943
1
1943i
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.
Final Electrical Specifications
I
Large TFT-LCD Desktop Monitor Displays
I
Flat Panel Televisions
I
4 Integrated Switches: 2.4A Buck, 2.6A Boost,
0.35A Boost, 0.35A Inverter (Guaranteed Minimum
Current Limit)
I
Fixed Frequency, Low Noise Outputs
I
Soft Start for all Outputs
I
Externally Programmable V
ON
Delay
I
Integrated Schottky Diode for V
ON
Output
I
PGOOD Pin for AV
DD
Output Disconnect
I
4.5V to 22V Input Voltage Range
I
PanelProtect
TM
Circuitry Disables V
ON
Upon Fault
I
Thermally Enhanced 28-Lead TSSOP
APPLICATIOU
FEATURES
DESCRIPTIO
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 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.
U
TYPICAL APPLICATIO
U
High Current Quad Output
Regulator for TFT LCD Panels
September 2003
, LTC and LT are registered trademarks of Linear Technology Corporation.
PannelProtect is a trademark of Linear Technology Corporation.
Figure 1. Quad Output TFT-LCD Power Supply
VC2
VC3
VC4
SW4
NFB4
FB4
BIAS
BOOST
SW1
FB1
VC1
SW2
FB2
RUN-SS
SS-234
C
T
PGOOD
V
ON
E3
FB3
GND
SGND
LT1943
V
IN
SW3
6.81k
27.4k
100pF
47.5k
100pF
2.2nF
2.2nF
680pF
100pF
16.2k
10.0k
10.0k
80.6k
232k
10.0k
10pF
10.0k
4.7
μ
H
B230A
0.22
μ
F
10V
CMDSH-3
V
LOGIC
2A
10
μ
F
0.47
μ
F
16V
1
μ
F
25V
ZHCS400
ZHCS400
B240A
V
–10V
50mA
10
μ
H
33
μ
H
10
μ
H
10
μ
H
95.3k
10
μ
F
2.2
μ
F
0.47
μ
F
13k
2.2nF
100pF
AV
DD
13V
500mA
PGOOD
V
ON
30V
30mA
1943 F01
2.2
μ
F
V
IN,
8V TO 20V
22
μ
F
0.015
μ
F
0.015
μ
F
0.047
μ
F
AV
10V/DIV
V
OFF
10V/DIV
RUN-SS
2V/DIV
V
5V/DIV
I
1A/DIV
V
E3
20V/DIV
ON
50VV
5ms/DIV
Startup Waveforms
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1943EFE#PBF | 功能描述:IC REG SW QUAD TFT LCD 28-TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標準包裝:43 系列:- 應用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應商設備封裝:48-QFN（7x7） 包裝:管件 |
| LT1943EFE#TR | 功能描述:IC REG SW QUAD TFT LCD 28-TSSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標準包裝:43 系列:- 應用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應商設備封裝:48-QFN（7x7） 包裝:管件 |
| LT1943EFE#TRPBF | 功能描述:IC REG SW QUAD TFT LCD 28-TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標準包裝:43 系列:- 應用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應商設備封裝:48-QFN（7x7） 包裝:管件 |
| LT1944 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Quad DCDC Converter for Triple Outputs TFT Supply Plus LED Driver |
| LT1944-1 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual Micropower Step-Up DC/DC Converter |
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