LTC1174 High Efficiency Step-Down and Inverting DC/DC Converter
The LTC™1174 is a simple current mode DC/DC converter ideally suited for 9V to 5V, 5V to 3.3V or 5V to ±5V operation. With an internal 0.9 Ohms switch (at a supply voltage of 9V), the LTC1174 requires only four external components to construct a complete high efficiency DC/DC converter. Under a no load condition the LTC1174 draws only 130µA. In shutdown, it draws a mere 1µA making this converter ideal for current sensitive applications. In dropout, the internal P-channel MOSFET switch is turned on continuously allowing the user to maximize the life of the battery source. The maximum inductor current of the LTC1174 family is pin selectable to either 340mA or 600mA, optimizing efficiency for a wide range of applications. Operation up to 200kHz permits the use of small surface mount inductors and capacitors. For applications requiring higher output current or ultra-high efficiency, see the LTC1148 data sheet.
产品特点 Features
- High Efficiency: Up to 94%
- Peak Inductor Current Independent of Inductor Value
- Short-Circuit Protection
- Optimized for 5V to ±5V Applications
- Wide VIN Range: 4V to 18.5V
- Low Dropout Operation
- Low-Battery Detector
- Pin Selectable Current Limit
- Internal 0.9 Ohms Power Switch: VIN = 9V
- Only Four External Components Required
- 130µA Standby Current
- Active Low Micropower Shutdown
参数
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应用
- Distributed Power Systems
- Step-Down Converters
- Inverting Converters
- Memory Backup Supply
- Portable Instruments
- Battery-Powered Equipment
典型应用图
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LTC1174 订购信息和价格参考Package Variations and Pricing
| 器件型号 |
封装 |
引脚 |
温度 |
价格 (以 1 ~ 99 片为批量) |
价格 (以 1000 片为批量) * |
| LTC1174CN8 |
PDIP |
8 |
C |
$4.35 |
$3.50 |
| LTC1174CN8#PBF |
PDIP |
8 |
C |
$4.35 |
$3.50 |
| LTC1174CN8-3.3 |
PDIP |
8 |
C |
$4.35 |
$3.50 |
| LTC1174CN8-3.3#PBF |
PDIP |
8 |
C |
$4.35 |
$3.50 |
| LTC1174CN8-5 |
PDIP |
8 |
C |
$4.35 |
$3.50 |
| LTC1174CN8-5#PBF |
PDIP |
8 |
C |
$4.35 |
$3.50 |
| LTC1174CS8 |
SO |
8 |
C |
$4.60 |
$3.70 |
| LTC1174CS8#PBF |
SO |
8 |
C |
$4.60 |
$3.70 |
| LTC1174CS8#TR |
SO |
8 |
C |
|
$3.76 |
| LTC1174CS8#TRPBF |
SO |
8 |
C |
|
$3.76 |
| LTC1174CS8-3.3 |
SO |
8 |
C |
$4.60 |
$3.70 |
| LTC1174CS8-3.3#PBF |
SO |
8 |
C |
$4.60 |
$3.70 |
| LTC1174CS8-3.3#TR |
SO |
8 |
C |
|
$3.76 |
| LTC1174CS8-3.3#TRPBF |
SO |
8 |
C |
|
$3.76 |
| LTC1174CS8-5 |
SO |
8 |
C |
$4.60 |
$3.70 |
| LTC1174CS8-5#PBF |
SO |
8 |
C |
$4.60 |
$3.70 |
| LTC1174CS8-5#TR |
SO |
8 |
C |
|
$3.76 |
| LTC1174CS8-5#TRPBF |
SO |
8 |
C |
|
$3.76 |
| LTC1174HVCN8 |
PDIP |
8 |
C |
$5.00 |
$4.00 |
| LTC1174HVCN8#PBF |
PDIP |
8 |
C |
$5.00 |
$4.00 |
| LTC1174HVCN8-3.3 |
PDIP |
8 |
C |
$5.00 |
$4.00 |
| LTC1174HVCN8-3.3#PBF |
PDIP |
8 |
C |
$5.00 |
$4.00 |
| LTC1174HVCN8-5 |
PDIP |
8 |
C |
$5.00 |
$4.00 |
| LTC1174HVCN8-5#PBF |
PDIP |
8 |
C |
$5.00 |
$4.00 |
| LTC1174HVCS8 |
SO |
8 |
C |
$5.25 |
$4.15 |
| LTC1174HVCS8#PBF |
SO |
8 |
C |
$5.25 |
$4.15 |
| LTC1174HVCS8#TR |
SO |
8 |
C |
|
$4.21 |
| LTC1174HVCS8#TRPBF |
SO |
8 |
C |
|
$4.21 |
| LTC1174HVCS8-3.3 |
SO |
8 |
C |
$5.25 |
$4.15 |
| LTC1174HVCS8-3.3#PBF |
SO |
8 |
C |
$5.25 |
$4.15 |
| LTC1174HVCS8-3.3#TR |
SO |
8 |
C |
|
$4.21 |
| LTC1174HVCS8-3.3#TRPBF |
SO |
8 |
C |
|
$4.21 |
| LTC1174HVCS8-5 |
SO |
8 |
C |
$5.25 |
$4.15 |
| LTC1174HVCS8-5#PBF |
SO |
8 |
C |
$5.25 |
$4.15 |
| LTC1174HVCS8-5#TR |
SO |
8 |
C |
|
$4.21 |
| LTC1174HVCS8-5#TRPBF |
SO |
8 |
C |
|
$4.21 |
| LTC1174HVIS8 |
SO |
8 |
I |
$5.80 |
$4.80 |
| LTC1174HVIS8#PBF |
SO |
8 |
I |
$5.80 |
$4.80 |
| LTC1174HVIS8#TR |
SO |
8 |
I |
|
$4.86 |
| LTC1174HVIS8#TRPBF |
SO |
8 |
I |
|
$4.86 |
| LTC1174IN8 |
PDIP |
8 |
I |
$5.00 |
$3.95 |
| LTC1174IN8#PBF |
PDIP |
8 |
I |
$5.00 |
$3.95 |
| LTC1174IS8 |
SO |
8 |
I |
$5.25 |
$4.15 |
| LTC1174IS8#PBF |
SO |
8 |
I |
$5.25 |
$4.15 |
| LTC1174IS8#TR |
SO |
8 |
I |
|
$4.21 |
| LTC1174IS8#TRPBF |
SO |
8 |
I |
|
$4.21 |
LTC1174 数据手册及相关资料下载
- 数据手册(英文) : LTC1174 - High Efficiency Step-Down and Inverting DC/DC Converter.PDF
- 应用指南 (英文) : AN66 - linear Technology Magazine Circuit Collection, Volume II.PDF
- 设计要点 (英文) : DN73 - A Simple High Efficiency, Step-Down Switching Regulator.PDF
- 设计要点 (英文) : DN74 - Techniques for Deriving 3.3V from 5V Supplies.PDF
- 设计要点 (英文) : DN86 - Ultra-Low Power, High Efficiency DC/DC Converter Operates Outside the Audio Band.PDF
- 设计要点 (英文) : DN91 - 5V to 3.3V Circuit Collection.PDF
- 可靠性数据 : R245 Reliability Data .PDF
