LM34917A
- Functional Input Voltage Range: 8V to 33V
- DSBGA package
- Input Over-Voltage Shutdown at ≊35V
- Transient Capability to 50V
- Integrated N-Channel buck switch
- Valley current limit varies with VIN and VOUT to reduce excessive inductor current
- On-time is reduced when in current limit
- Integrated start-up regulator
- No loop compensation required
- Ultra-Fast transient response
- Maximum switching frequency: 2 MHz
- Operating frequency remains nearly constant with load current and input voltage variations
- Programmable soft-start
- Precision internal reference
- Adjustable output voltage
- Thermal shutdown
Package
- 12-Bump DSBGA Package
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The LM34917A Step-Down Switching Regulator features all the functions needed to implement a low cost, efficient, buck bias regulator capable of supplying at least 1.25A to the load. To reduce excessive switch current due to the possibility of a saturating inductor the valley current limit threshold changes with input and output voltages, and the on-time is reduced when current limit is detected. This buck regulator contains an N-Channel Buck Switch, and is available in the 12 pin DSBGA package. The constant on-time feedback regulation scheme requires no loop compensation, results in fast load transient response, and simplifies circuit implementation. The operating frequency remains constant with line and load variations due to the inverse relationship between the input voltage and the on-time. The valley current limit results in a smooth transition from constant voltage to constant current mode when current limit is detected, reducing the frequency and output voltage, without the use of foldback. Additional features include: VCC under-voltage lock-out, input over-voltage shutdown, thermal shutdown, gate drive under-voltage lock-out, and maximum duty cycle limit.
技術資料
種類 | タイトル | 最新の英語版をダウンロード | 日付 | |||
---|---|---|---|---|---|---|
* | データシート | Ultra Small 33V,1.25A Constant On-Time Buck Sw Reg w/Intelligent Current Limit データシート (Rev. D) | 2013年 3月 7日 | |||
セレクション・ガイド | 電源 IC セレクション・ガイド 2018 (Rev. R 翻訳版) | 英語版 (Rev.R) | 2018年 9月 13日 | |||
EVM ユーザー ガイド (英語) | AN-1601 LM34917A Evaluation Board (Rev. D) | 2013年 4月 25日 |
設計と開発
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パッケージ | ピン数 | ダウンロード |
---|---|---|
DSBGA (YZR) | 12 | オプションの表示 |
購入と品質
- RoHS
- REACH
- デバイスのマーキング
- リード端子の仕上げ / ボールの原材料
- MSL 定格 / ピーク リフロー
- MTBF/FIT 推定値
- 材質成分
- 認定試験結果
- 継続的な信頼性モニタ試験結果
- ファブの拠点
- 組み立てを実施した拠点