計算工具
FET-INRUSH-SOA-CALC — FET SOA margin calculator for dvdt based startup
The design calculator allows user to estimate the FET SOA margin while starting up with dVdt based startup for inrush current control
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
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檢視所有 2 | 類型 | 標題 | 日期 | ||
|---|---|---|---|---|
| * | Data sheet | LM74502, LM74502H Low IQ High Side Switch Controller with Reverse Polarity and Overvoltage Protection datasheet (Rev. A) | PDF | HTML | 2022年 5月 6日 |
| Application brief | Three Ways to Use High Side Switch Driver Using LM74502 | PDF | HTML | 2021年 12月 20日 |
設計與開發
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開發板
LM74502EVM — 適用於理想二極體控制器的 LM74502 和 LM74502H 評估模組
LM74502EVM 是一款評估模組，可評估具切換輸出、LM74502 和 LM74502H 的理想二極體控制器性能。 LM74502 理想二極體控制器可驅動和控制外部背對背 N 通道 MOSFET，以模擬具電源路徑開啟和關閉控制及過電壓保護的理想二極體整流器。
模擬工具
PSPICE-FOR-TI — PSpice® for TI 設計與模擬工具
PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
參考設計
PMP41115 — 240W 整合式 USB Type-C 和 USB PD3.1 充電器參考設計
此參考設計為可容納 10 至 12 芯電池的整合式 USB Type-C 和 USB 電力輸送 (PD) 充電器，適合電動自行車、高電量行動電源和攜帶式充電站應用。此設計整合 USB PD3.1 控制器 TPS26750 和 TPD4S480，結合 48V 延伸功率範圍 (ERP) USB 連接埠保護器與四開關降壓升壓控制器 BQ25756，以 240W 的功率全面實現 USB PD3.1 功能。PD 控制器可透過 I2C 通訊，與電池充電器控制器 BQ25756 搭配運作。BQ25756 (...)
Test report: PDF
| 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
內含資訊：
- RoHS
- REACH
- 產品標記
- 鉛塗層/球物料
- MSL 等級/回焊峰值
- MTBF/FIT 估算值
- 材料內容
- 認證摘要
- 進行中持續性的可靠性監測
內含資訊：
- 晶圓廠位置
- 組裝地點
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。