參數(shù)資料
型號(hào)： LT1942
廠商： Linear Technology Corporation
元件分類： LED驅(qū)動(dòng)器
英文描述： Quad DCDC Converter for Triple Outputs TFT Supply Plus LED Driver
中文描述： 四特思數(shù)碼轉(zhuǎn)換器，用于三輸出TFT電源，雙LED驅(qū)動(dòng)器
文件頁數(shù)： 1/16頁
文件大小： 248K
代理商： LT1942
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)
APPLICATIU
Quad DC/DC Converter
for Triple Output TFT Supply
Plus LED Driver
DESCRIPTIOU
■
Poly-Silicon TFT Displays
■
Amorphous Silicon TFT Displays
CTRL4
SGND/
AGND
D3
SW3
LT1942
SW1
FB1
PGND14
PGOOD
SW4
D4
LED1
LED2
FB4
CT
FB3
PGND23
V
OUT3
NFB2
D2
SW2
0.1
μ
F
0.22
μ
F
47
μ
H
V
IN
47
μ
H
SHDN
V
CC
SS1
SS4
22
μ
H
22
μ
H
CMDSH-3
Si2301BDS
33
μ
H
301k
1M
100k
V
IN
4.7pF
0.1
μ
F
0.1
μ
F
0.1
μ
F
1942 TA01
0.22
μ
F
0.22
μ
F
SHUTDOWN
LED CONTROL
AV
DD
5V
40mA
4.7
μ
F
4.7
μ
F
698k
100k
10k
V
IN
3V TO 4.2V
V
ON
10V
2mA
V
OFF
–10V
2mA
665k
4.99
20mA
20mA
TFT Bias and White LED Backlight Power Supply
FEATURES
相關(guān)PDF資料
PDF描述
LT1942EUF Quad DCDC Converter for Triple Outputs TFT Supply Plus LED Driver
LT1943 High Current Quad Output Regulator for TFT LCD Panels
LT1943EFE High Current Quad Output Regulator for TFT LCD Panels
LT1944 1.4A, 1.5MHz Synchronous Step-Up DC/DC Converter with Output Disconnect
LT1944-1 Dual Micropower Step-Up DC/DC Converter
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LT1942EUF 制造商:Linear Technology 功能描述:Conv DC-DC Quad Inv/Step Up 2.6V to 16V 24-Pin QFN EP
LT1942EUF#PBF 功能描述:IC REG SW QUAD TFT LCD 24-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)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(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件
LT1942EUF#TRPBF 功能描述:IC REG SW QUAD TFT LCD 24-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)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(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件
LT1942EUFPBF 制造商:Linear Technology 功能描述:Conv DC-DC Quad Inv/Step-Up 16V QFN24EP
LT1943 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
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