LM5642
- Two Synchronous Buck Regulators
- 180° Out of Phase Operation
- 200 kHz Fixed Nominal Frequency: LM5642
- 375 kHz Fixed Nominal Frequency: LM5642X
- Synchronizable Switching Frequency from 150 kHz to 250 kHz for the LM5642 and 200 kHz to 500 kHz for the LM5642X
- 4.5V to 36V Input Range
- 50 µA Shutdown Current
- Adjustable Output from 1.3V to 90% of Vin
- 0.04% (Typical) Line and Load Regulation Accuracy
- Current Mode Control with or without a Sense Resistor
- Independent Enable/Soft-start Pins Allow Simple Sequential Startup Configuration.
- Configurable for Single Output Parallel Operation.
- Adjustable Cycle-by-cycle Current Limit
- Input Under-voltage Lockout
- Output Over-voltage Latch Protection
- Output Under-voltage Protection with Delay
- Thermal Shutdown
- Self Discharge of Output Capacitors when the Regulator is OFF
- TSSOP and HTSSOP (Exposed PAD) Packages
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The LM5642 series consists of two current mode synchronous buck regulator controllers operating 180° out of phase with each other at a normal switching frequency of 200kHz for the LM5642 and at 375kHz for the LM5642X.
Out of phase operation reduces the input RMS ripple current, thereby significantly reducing the required input capacitance. The switching frequency can be synchronized to an external clock between 150 kHz and 250 kHz for the LM5642 and between 200 kHz and 500 kHz for the LM5642X. The two switching regulator outputs can also be paralleled to operate as a dual-phase, single output regulator.
The output of each channel can be independently adjusted from 1.3V to 90% of Vin. An internal 5V rail is also available externally for driving bootstrap circuitry.
Current-mode feedback control assures excellent line and load regulation and wide loop bandwidth for excellent response to fast load transients. Current is sensed across either the Vds of the top FET or across an external current-sense resistor connected in series with the drain of the top FET.
The LM5642 features analog soft-start circuitry that is independent of the output load and output capacitance making the soft-start behavior more predictable and controllable than traditional soft-start circuits.
Over-voltage protection is available for both outputs. A UV-Delay pin is also available to allow delayed shut off time for the IC during an output under-voltage event.
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 | LM5642/42X High V, Dual Sync Buck Converter w/Oscil Sync データシート (Rev. K) | 2013年 4月 4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 | |||
| Analog Design Journal | Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics | 2016年 7月 21日 | ||||
| EVM ユーザー ガイド (英語) | AN-1292 LM5642 Evaluation Board (Rev. B) | 2013年 4月 25日 |
設計と開発
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LM5642EVAL-KIT — 高電圧、２回路、同期整流・降圧コンバータ、オシレータ同期付
High Voltage, Dual Synchronous Buck Converter with Oscillator Synchronization
| パッケージ | ピン数 | ダウンロード |
|---|---|---|
| HTSSOP (PWP) | 28 | オプションの表示 |
| TSSOP (PW) | 28 | 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