LTC1157 3.3V Dual Micropower High-Side/Low-Side MOSFET Driver
The LTC1157 dual 3.3V micropower MOSFET gate driver makes it possible to switch either supply or ground reference loads through a low R DS(ON) Nchannel switch (N-channel switches are required at 3.3V because P-channel MOSFETS do not have guaranteed R DS(ON) with VGS </= 3.3V). The LTC1157 internal charge pump boosts the gate drive voltage 5.4V above the positive rail (8.7V above ground), fully enhancing a logic level N-channel switch for 3.3V high-side applications and a standard N-channel switch for 3.3V low-side applications. The gate drive voltage at 5V is typically 8.8V above supply (13.8V above ground), so standard N-channel MOSFET switches can be used for both high-side and low-side applications. Micropower operation, with 3µA standby current and 80µA operating current, makes the LTC1157 well suited for battery-powered applications. The LTC1157 is available in both 8-pin DIP and SOIC
产品特点 Features
- Allows Lowest Drop 3.3V Supply Switching
- Operates on 3.3V or 5V Nominal Supplies
- 3 Microamps Standby Current
- 80 Microamps ON Current
- Drives Low Cost N-Channel Power MOSFETs
- No External Charge Pump Components
- Controlled Switching ON and OFF Times
- Compatible with 3.3V and 5V Logic Families
- Available in 8-Pin SOIC
参数
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应用
- Notebook Computer Power Management
- Palmtop Computer Power Management
- P-Channel Switch Replacement
- Battery Charging and Management
- Mixed 5V and 3.3V Supply Switching
- Stepper Motor and DC Motor Control
- Cellular Telephones and Beepers
典型应用图
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LTC1157 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) * |
| LTC1157CN8 |
PDIP |
8 |
C |
$3.50 |
$2.90 |
| LTC1157CN8#PBF |
PDIP |
8 |
C |
$3.50 |
$2.90 |
| LTC1157CS8 |
SO |
8 |
C |
$3.75 |
$3.10 |
| LTC1157CS8#PBF |
SO |
8 |
C |
$3.75 |
$3.10 |
| LTC1157CS8#TR |
SO |
8 |
C |
|
$3.16 |
| LTC1157CS8#TRPBF |
SO |
8 |
C |
|
$3.16 |
LTC1157 数据手册及相关资料下载
- 数据手册(英文) : LTC1157 - 3.3V Dual Micropower High-Side/Low-Side MOSFET Driver.PDF
- 应用指南 (英文) : AN51 - Power Conditioning for Notebook and Palmtop Systems.PDF
- 应用指南 (英文) : AN53 - Micropower High Side MOSFET Drivers.PDF
- 应用指南 (英文) : AN66 - linear Technology Magazine Circuit Collection, Volume II.PDF
- 设计要点 (英文) : DN76 - PC Card Power Management Techniques.PDF
- 可靠性数据 : R294 Reliability Data .PDF
