参数资料
| 型号： | LT1942EUF#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/16页 |
| 文件大小： | 0K |
| 描述： | IC REG SW QUAD TFT LCD 24-QFN |
| 标准包装： | 2,500 |
| 应用： | 转换器，TFT |
| 输入电压： | 2.6 V ~ 16 V |
| 输出数： | 4 |
| 输出电压： | 1.25 V ~ 36 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 供应商设备封装： | 24-QFN 裸露焊盘（4x4） |
| 包装： | 带卷 (TR) |
LT1942
Quad DC/DC Converter
for Triple Output TFT Supply
Plus LED Driver
FEATURES
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 × 4mm)
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 volt-
age. The user can elect to drive a single string or two
strings of LEDs. An LED ballast circuit is included to
APPLICATIO S
precisely match the LED currents if two strings of LEDs are
used. Soft-start is built into the LED driver as well as the
■
Poly-Silicon TFT Displays
primary TFT supply.
■ Amorphous Silicon TFT Displays
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
The LT1942 is available in a low profile (0.75mm) 24-lead
QFN (4mm × 4mm) package.
TYPICAL APPLICATIO
TFT Bias and White LED Backlight Power Supply
V IN
3V TO 4.2V
2.2 μ F
22 μ H
22 μ H
CMDSH-3
301k
4.7pF
Si2301BDS
1M
AV DD
5V
40mA
V ON
10V
2mA
0.22 μ F
698k
100k
D3
FB3
SW3
V CC
SW1
FB1
PGND14
100k
4.7 μ F
4.7 μ F
20mA
20mA
PGND23
PGOOD
10k
0.22 μ F
V OUT3
NFB2
LT1942
SW4
D4
33 μ H
V IN
V OFF
–10V
2mA
665k
V IN
SHUTDOWN
LED CONTROL
47 μ H
47 μ H
0.1 μ F
D2
SW2
SHDN SGND/
CTRL4 AGND
SS1
SS4
0.1 μ F
LED1
LED2
FB4
CT
0.1 μ F
4.99 ?
1942 TA01
0.1 μ F
1942fb
1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1943 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Quad DCDC Converter for Triple Outputs TFT Supply Plus LED Driver |
| LT1943_1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Current Quad Output Regulator for TFT LCD Panels |
| LT1943EFE | 功能描述:IC REG SW QUAD TFT LCD 28-TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LT1943EFE#PBF | 功能描述:IC REG SW QUAD TFT LCD 28-TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LT1943EFE#TR | 功能描述:IC REG SW QUAD TFT LCD 28-TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
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