Datasheet > LT1943

LT1943

更新时间： 2024-12-02 14:57:59

品牌	Logo	应用领域
亚德诺 - ADI		稳压器
页数	文件大小	规格书
20页	271K
描述
用于 TFT LCD 屏的高电流、四路输出稳压器

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中文翻译

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数据手册

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LT1943 数据手册

LT1943

High Current Quad Output

Regulator for TFT LCD Panels

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, cangeneratea3.3Vor5Vlogicsupplyalongwith

the triple output supply required for the TFT LCD panel.

Operatingfromaninputrangeof4.5Vto22V, astep-down

regulator provides a low voltage output V_LOGICwith 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_ONand

■

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_ONDelay

■

Integrated Schottky Diode for V_ONOutput

■

PGOOD Pin for AV_DDOutput Disconnect

■

4.5V to 22V Input Voltage Range

PanelProtect^TMCircuitry Disables V_ONUpon Fault

■

_OFFrequired by the LCD panel. A high-side PNP provides

■

Available in Thermally Enhanced 28-Lead TSSOP

delayed turn-on of the V_ONsignal and can handle up to

30mA. Protection circuitry ensures that V_ONis disabled if

any of the four outputs are more than 10% below the

programmed voltage.

APPLICATIO S

■

Large TFT-LCD Desktop Monitors

Flat Panel Televisions

■

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_DDoutput.

, 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

8V TO 20V

IN,

10µH

12.2V

OFF

–5.5V

50mA

500mA

1µF

10µF

0.47µF

33µH

10µH

88.7k

10.0k

10µF

2.2µF

Startup Waveforms

44.2k

SW3

SW4

SW2

FB2

RUN-SS

2V/DIV

NFB4

0.015µF

0.047µF

RUN-SS

SS-234

LOGIC

10.0k

10pF

10µH

5V/DIV

LT1943

FB4

10V/DIV

BIAS

BOOST

PGOOD

OFF

35V

10V/DIV

30mA

0.22µF

SW1

FB1

274k

4.7µH

20V/DIV

16.2k

FB3

LOGIC

3.3V

GND

SGND

10.0k

2.2µF

50V/DIV

10.0k

22µF

IN(AVG)

1A/DIV

5ms/DIV

0.47µF

18k

100pF

2.2nF

13k

6.8k

27k

100pF

680pF

100pF

2.2nF

100pF

2.2nF

1943 TA01

Quad Output TFT-LCD Power Supply

1943fa

12 3 4 5 6 7...20

中文翻译

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与LT1943相关器件

型号	品牌	获取价格	描述	数据表
LT1943_1	Linear	获取价格	High Current Quad Output Regulator for TFT LCD Panels
LT1943EFE	Linear	获取价格	High Current Quad Output Regulator for TFT LCD Panels
LT1943EFE#PBF	Linear	获取价格	LT1943 - High Current Quad Output Regulator for TFT LCD Panels; Package: TSSOP; Pins: 28;
LT1943EFE#TR	Linear	获取价格	暂无描述
LT1943EFE#TRPBF	Linear	获取价格	LT1943 - High Current Quad Output Regulator for TFT LCD Panels; Package: TSSOP; Pins: 28;
LT1944	Linear	获取价格	1.4A, 1.5MHz Synchronous Step-Up DC/DC Converter with Output Disconnect
LT1944	ADI	获取价格	双通道、微功率升压型 DC/DC 转换器
LT1944-1	Linear	获取价格	Dual Micropower Step-Up DC/DC Converter
LT1944-1	ADI	获取价格	双通道、微功率升压型 DC/DC 转换器
LT1944-1EMS	Linear	获取价格	Dual Micropower Step-Up DC/DC Converter

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