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LT1942 Datasheet(PDF) 1 Page - Linear Technology

No. de pieza LT1942
Descripción Electrónicos  Quad DCDC Converter for Triple Outputs TFT Supply Plus LED Driver
Download  16 Pages
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Fabricante Electrónico  LINER [Linear Technology]
Página de inicio  http://www.linear.com
Logo LINER - Linear Technology

LT1942 Datasheet(HTML) 1 Page - Linear Technology

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LT1942
1
1942fa
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
The LT
®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
× 4mm) package.
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
× 4mm)
Quad DC/DC Converter
for Triple Output TFT Supply
Plus LED Driver
Poly-Silicon TFT Displays
Amorphous Silicon TFT Displays
CTRL4
SGND/
AGND
D3
SW3
LT1942
SW1
FB1
PGND14
PGOOD
SW4
D4
LED1
LED2
FB4
FB3
PGND23
VOUT3
NFB2
D2
SW2
0.1
µF
0.22
µF
47
µH
VIN
47
µH
SHDN
VCC
SS1
SS4
CT
22
µH
22
µH
CMDSH-3
Si2301BDS
33
µH
301k
1M
100k
VIN
4.7pF
0.1
µF
0.1
µF
0.1
µF
1942 TA01
0.22
µF
0.22
µF
SHUTDOWN
LED CONTROL
AVDD
5V
40mA
4.7
µF
4.7
µF
698k
100k
10k
VIN
3V TO 4.2V
VON
10V
2mA
VOFF
–10V
2mA
665k
4.99
20mA
20mA
TFT Bias and White LED Backlight Power Supply
APPLICATIO S
DESCRIPTIO
FEATURES


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