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参数资料
| 型号： | LT1943EFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/20页 |
| 文件大小： | 0K |
| 描述： | IC REG SW QUAD TFT LCD 28-TSSOP |
| 标准包装： | 2,000 |
| 应用： | 转换器，TFT，LCD |
| 输入电压： | 4.5 V ~ 22 V |
| 输出数： | 4 |
| 输出电压： | 1.25 V ~ 40 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SOIC（0.173"，4.40mm 宽）裸露焊盘 |
| 供应商设备封装： | 28-TSSOP 裸露焊盘 |
| 包装： | 带卷 (TR) |
LT1943
High Current Quad Output
Regulator for TFT LCD Panels
FEATURES
DESCRIPTIO
■
4 Integrated Switches: 2.4A Buck, 2.6A Boost,
The LT ? 1943 quad output adjustable switching regulator
Externally Programmable V ON Delay
Integrated Schottky Diode for V ON Output
PGOOD Pin for AV DD Output Disconnect
PanelProtect TM Circuitry Disables V ON Upon Fault
0.35A Boost, 0.35A Inverter (Guaranteed Minimum
Current Limit)
■ Fixed Frequency, Low Noise Outputs
■ Soft-Start for all Outputs
■
■
■
■ 4.5V to 22V Input Voltage Range
■
■ Available in Thermally Enhanced 28-Lead TSSOP
APPLICATIO S
provides power for large TFT LCD panels. The device,
housed in a low profile 28 pin thermally enhanced TSSOP
package, can generate a 3.3V or 5V logic supply along with
the triple output supply required for the TFT LCD panel.
Operating from an input range of 4.5V to 22V, a step-down
regulator provides a low voltage output V LOGIC with 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 ON and
V OFF required by the LCD panel. A high-side PNP provides
delayed turn-on of the V ON signal and can handle up to
30mA. Protection circuitry ensures that V ON is disabled if
any of the four outputs are more than 10% below the
■
■
Large TFT-LCD Desktop Monitors
Flat Panel Televisions
programmed voltage.
All switchers are synchronized to an internal 1.2MHz
, 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.
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 DD output.
TYPICAL APPLICATIO
V OFF
–5.5V
V IN, 8V TO 20V
10 μ H
AV DD
12.2V
50mA
2.2 μ F
44.2k
0.47 μ F
10 μ F
33 μ H
1 μ F
10 μ H
88.7k
500mA
10 μ F
Startup Waveforms
10.0k
10pF
0.22 μ F
10 μ H
SW4
NFB4
FB4
BIAS
BOOST
V IN SW3
LT1943
SW2
FB2
RUN-SS
SS-234
C T
PGOOD
V ON
E3
0.015 μ F
0.015 μ F
0.047 μ F
PGOOD
10.0k
V ON
35V
30mA
RUN-SS
2V/DIV
V LOGIC
5V/DIV
AV DD
10V/DIV
V OFF
10V/DIV
V LOGIC
3.3V
2A
16.2k
10.0k
22 μ F
4.7 μ H
SW1
FB1
V C1
V C2
V C3
FB3
GND
SGND
V C4
274k
10.0k
2.2 μ F
V E3
20V/DIV
V ON
50V/DIV
I IN(AVG)
1A/DIV
5ms/DIV
18k
100pF
2.2nF
100pF
2.2nF
6.8k
27k
100pF
680pF
13k
100pF
2.2nF
0.47 μ F
Quad Output TFT-LCD Power Supply
1943 TA01
1943fa
1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1944 | 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 |
| LT1944-1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Micropower Step-Up DC/DC Converter |
| LT1944-1EMS | 功能描述:IC REG BST ADJ 0.1A/175MA 10MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
| LT1944-1EMS#PBF | 功能描述:IC REG BST ADJ 0.1A/175MA 10MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LT1944-1EMS#TR | 功能描述:IC REG BST ADJ 0.1A/175MA 10MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
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