LM74502H
- 3.2-V to 65-V input range (3.9-V start-up)
- –65-V input reverse voltage rating
- Integrated charge pump to drive
- External back-to-back N-Channel MOSFETs
-
External high side switch MOSFET
-
External reverse polarity protection MOSFET
- Gate drive variants
- LM74502: 60-µA peak gate drive source capacity
- LM74502H: 11-mA peak gate drive source capacity
- 2.3-A peak gate sink current capacity
- Enable pin feature
- 45-µA typical operating quiescent current (EN/UVLO = High)
- 1-µA shutdown current (EN/UVLO = Low)
- Adjustable overvoltage and undervoltage protection
- –40°C to +125°C ambient operating temperature range
- Available in 8-pin SOT-23 package 2.90 mm × 1.60 mm
The LM74502, LM74502H is a controller which operates in conjunction with an external back-to-back connected N-channel MOSFETs to realize a low loss reverse polarity protection and load disconnect solution. The device can also be configured to drive high side MOSFET as a load switch with overvoltage protection . The wide supply input range of 3.2 V to 65 V allows control of many popular DC bus voltages such as 12-V, 24-V and 48-V input systems. The device can withstand and protect the loads from negative supply voltages down to –65 V. The LM74502, LM74502H does not have reverse current blocking and is suitable for input reverse polarity protection only.
The LM74502 controller provides a charge pump gate drive for an external N-channel MOSFET. with the enable pin low, the controller is off and draws approximately 1 µA of current, thus offering low system current when put into sleep mode. LM74502 and LM74502H offers programmable overvoltage and undervoltage protection which cuts off the load from the input source in case of these fault events. The devices are available in a 2.9 mm × 1.6 mm 8-pin DDF package and are specified over a –40°C to +125°C temperature range.
技術文件
| 重要文件 | 類型 | 標題 | 格式選項 | 下載最新的英文版本 | 日期 | |
|---|---|---|---|---|---|---|
| * | 資料表 | LM74502, LM74502H Low IQ High Side Switch Controller with Reverse Polarity and Overvoltage Protection datasheet (Rev. A) | PDF | HTML | 2022/5/6 | ||
| Application brief | Three Ways to Use High Side Switch Driver Using LM74502 | PDF | HTML | 2021/12/20 |
設計與開發
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| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| SOT-23-THN (DDF) | 8 | Ultra Librarian |
訂購與品質
建議產品可能具有與此 TI 產品相關的參數、評估模組或參考設計。