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参数资料
| 型号： | LT1948EMS8#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 1.5 A SWITCHING REGULATOR, 3600 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | PLASTIC, MSOP-8 |
| 文件页数： | 1/4页 |
| 文件大小： | 113K |
| 代理商： | LT1948EMS8#TRPBF |
LT1948
1
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
s
TFT-LCD Notebook Display Panels
s
TFT-LCD Desktop Monitor Display Panels
s
Digital Cameras
s
Handheld Computers
, LTC and LT are registered trademarks of Linear Technology Corporation.
s
Complete Solution Under 1.2mm
s
Develops Three Outputs from a 3.3V or 5V Supply
s
Externally Programmable VON Delay
s
Fixed Frequency Low Noise Outputs
s
All Ceramic Capacitors
s
Operates at 3MHz Switching Frequency
s
Fast Transient Response
s
Few External Components Required
s
2.6V to 6V Input Range
s
Tiny 8-Lead MSOP Package
APPLICATIO S
U
FEATURES
DESCRIPTIO
U
TYPICAL APPLICATIO
U
DC/DC Converter for
TFT-LCD Panels
August 2000
Final Electrical Specifications
L2, 2.2
H
BAT54S
D3A
D3B
D1
MBRM120
C5
1
F
C4
0.22
F
C2
2.2
F
C1
2.2
F
VIN
2.5V TO
6V
AVDD
8V
260mA
VON
23V
10mA
1948 F01
VOFF
–8V
15mA
FB1
SW1
LT1948
VIN
VON
CT
SW2
VO2
C6
22nF
C1, C2: TAIYO YUDEN LMK212BJ225
C3: TAIYO YUDEN TMK316BJ224
C4: TAIYO YUDEN EMK212BJ224
C5: TAIYO YUDEN LMK212BJ105
L1–L3: TAIYO YUDEN LB2012-2R2
GND
L1, 2.2
H
D2
CMDSH-3
L3
2.2
H
C3
0.22
F
R1
53.6k
R2
10k
Figure 1. 3.3V Powered TFT-LCD Bias Generator
2ms/DIV
1948 TA01a
VIN
5V/DIV
VON
20V/DIV
AVDD
10V/DIV
VOFF
10V/DIV
Start-Up Waveforms
The LT
1948 is a highly integrated multiple output DC/DC
converter designed for use in TFT-LCD panels. The device
contains two independent switching regulators: the main
regulator has an adjustable output voltage with an internal
1.1A switch that can generate a boosted voltage as high as
30V while the second regulator generates 23V at up to
10mA for positive bias. A simple level-shift charge pump
off the main switch node generates the negative bias
voltage. An external capacitor sets the delay time from
AVDD reaching final value to 23V appearing at the VON pin.
The 3MHz switching frequency allows the use of tiny low
profile chip inductors and capacitors throughout, provid-
ing a low noise, low cost total solution with all components
under 1.25mm in height. The device operates from an
input range of 2.6V to 6V and is available in an 8-lead
MSOP package.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1949 | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.4A, 1.5MHz Synchronous Step-Up DC/DC Converter with Output Disconnect |
| LT1949-1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.4A, 1.5MHz Synchronous Step-Up DC/DC Converter with Output Disconnect |
| LT1949-1EMS8 | 功能描述:IC REG BOOST ADJ 1A 8MSOP 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:20 系列:SIMPLE SWITCHER® 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:12V 输入电压:4 V ~ 60 V PWM 型:电压模式 频率 - 开关:52kHz 电流 - 输出:1A 同步整流器:无 工作温度:-40°C ~ 125°C 安装类型:通孔 封装/外壳:16-DIP（0.300"，7.62mm） 包装:管件 供应商设备封装:16-DIP 其它名称:*LM2575HVN-12LM2575HVN-12 |
| LT1949-1EMS8#PBF | 功能描述:IC REG BOOST ADJ 1A 8MSOP 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:20 系列:SIMPLE SWITCHER® 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:12V 输入电压:4 V ~ 60 V PWM 型:电压模式 频率 - 开关:52kHz 电流 - 输出:1A 同步整流器:无 工作温度:-40°C ~ 125°C 安装类型:通孔 封装/外壳:16-DIP（0.300"，7.62mm） 包装:管件 供应商设备封装:16-DIP 其它名称:*LM2575HVN-12LM2575HVN-12 |
| LT1949-1EMS8#TR | 功能描述:IC REG BOOST ADJ 1A 8MSOP 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:20 系列:SIMPLE SWITCHER® 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:12V 输入电压:4 V ~ 60 V PWM 型:电压模式 频率 - 开关:52kHz 电流 - 输出:1A 同步整流器:无 工作温度:-40°C ~ 125°C 安装类型:通孔 封装/外壳:16-DIP（0.300"，7.62mm） 包装:管件 供应商设备封装:16-DIP 其它名称:*LM2575HVN-12LM2575HVN-12 |
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