LM27222
- Adaptive Shoot-through Protection
- 10ns Dead Time
- 8ns Propagation Delay
- 30ns Minimum On-time
- 0.4Ω Pull-down and 0.9Ω Pull-up Drivers
- 4.5A Peak Driving Current
- MOSFET Tolerant Design
- 5µA Quiescent Current
- 30V Maximum Input Voltage in Buck Configuration
- 4V to 6.85V Operating Voltage
- SOIC-8 and WSON Packages
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The LM27222 is a dual N-channel MOSFET driver designed to drive MOSFETs in push-pull configurations as typically used in synchronous buck regulators. The LM27222 takes the PWM output from a controller and provides the proper timing and drive levels to the power stage MOSFETs. Adaptive shoot-through protection prevents damaging and efficiency reducing shoot-through currents, thus ensuring a robust design capable of being used with nearly any MOSFET. The adaptive shoot-through protection circuitry also reduces the dead time down to as low as 10ns, ensuring the highest operating efficiency. The peak sourcing and sinking current for each driver of the LM27222 is about 3A and 4.5Amps respectively with a Vgs of 5V. System performance is also enhanced by keeping propagation delays down to 8ns. Efficiency is once again improved at all load currents by supporting synchronous, non-synchronous, and diode emulation modes through the LEN pin. The minimum output pulse width realized at the output of the MOSFETs is as low as 30ns. This enables high operating frequencies at very high conversion ratios in buck regulator designs. To support low power states in notebook systems, the LM27222 draws only 5µA from the 5V rail when the IN and LEN inputs are low or floating.
技術資料
| 上位の文書 | タイプ | タイトル | フォーマットオプション | 最新の英語版をダウンロード | 日付 | |
|---|---|---|---|---|---|---|
| * | データシート | LM27222 High-Speed 4.5A Synchronous MOSFET Driver データシート (Rev. B) | 2013/03/07 | |||
| アプリケーション・ノート | Using Half-Bridge Gate Driver to Achieve 100% Duty Cycle for High Side FET | PDF | HTML | 2024/03/25 | |||
| アプリケーション・ノート | Bootstrap Circuitry Selection for Half Bridge Configurations (Rev. A) | PDF | HTML | 2023/09/08 | |||
| アプリケーション・ノート | ゲート駆動電流を増加させる 2 通りの方法の比較分析 (Rev. A) | PDF | HTML | 2022/02/17 | |||
| アプリケーション概要 | External Gate Resistor Selection Guide (Rev. A) | 2020/02/28 | ||||
| アプリケーション概要 | Understanding Peak IOH and IOL Currents (Rev. A) | 2020/02/28 | ||||
| その他の技術資料 | Fundamentals of MOSFET and IGBT Gate Driver Circuits (Replaces SLUP169) (Rev. A) | 2018/10/29 |
設計と開発
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| パッケージ | ピン数 | CAD シンボル、フットプリント、および 3D モデル |
|---|---|---|
| SOIC (D) | 8 | Ultra Librarian |
| WSON (NGT) | 8 | Ultra Librarian |
購入と品質
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