LT1942 Datasheet

IC型號：
LT1942
PDF描述：
Quad DCDC Converter for Triple Outputs TFT Supply Plus LED D...
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16頁
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LT1942

Quad DC/DC Converter

for Triple Output TFT Supply

Plus LED Driver

FEATURES

鈻?/div>

DESCRIPTIO

Triple Output TFT Supply with Built-In

Power Sequencing

Integrated White LED Backlight Driver

Integrated Schottky Diodes

Active Ballast Circuitry Ensures Precise Current

Matching in White LEDs

Low Noise 1MHz Fixed Frequency Operation

2.6V to 16V Input Voltage Range

Soft-Start Limits Inrush Current

TFT Supply Output Voltages Independently Set

(Not Charge Pump Derived)

Power Good and Output Disconnect for TFT Supply

Built-In LED Dimming Capability

Open LED Protection for LED Driver

24-Lead QFN Package (4mm

脳

4mm)

The LT

廬

1942 is a highly integrated quad switching regu-

lator designed to provide all necessary power supply

functions for TFT displays, including the white LED

backlight driver. The TFT supply incorporates two boost

and one inverting DC/DC converters. The TFT supply

output voltages are independently set, unlike charge

pump solutions which have many limitations. Power

sequencing for the TFT supply is built into the part and is

user programmable.

The LED driver is a boost DC/DC converter that can be

independently controlled. The LED driver has built-in

dimming control for precise control of LED current. An 8:1

dimming range is achieved by adjusting the CTRL4

voltage.The user can elect to drive a single string or two

strings of LEDs. An LED ballast circuit is included to

precisely match the LED currents if two strings of LEDs are

used. Soft-start is built into the LED driver as well as the

primary TFT supply.

The LT1942 is available in a low profile (0.75mm) 24-lead

QFN (4mm

脳

4mm) package.

, LTC and LT are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

APPLICATIO S

鈻?/div>

Poly-Silicon TFT Displays

Amorphous Silicon TFT Displays

TFT Bias and White LED Backlight Power Supply

3V TO 4.2V

0.22碌F

698k

10V

2mA

10k

0.22碌F

OFF

鈥?0V

2mA

665k

47碌H

0.1碌F

0.22碌F

100k

PGND23

OUT3

NFB2

SW2

SHDN SGND/

CTRL4 AGND

SS1

SS4

0.1碌F

LT1942

FB3

SW3

22碌H

SW1

FB1

PGND14

PGOOD

SW4

LED1

LED2

FB4

0.1碌F

4.99鈩?/div>

1942 TA01

CMDSH-3

301k

4.7pF

4.7碌F

100k

33碌H

SHUTDOWN

LED CONTROL

Si2301BDS

40mA

4.7碌F

20mA

1942fa

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