TPS65251
- Wide Input Supply Voltage Range (4.5 to 18 V)
- 0.8 V, 1% Accuracy Reference
- Continuous Loading: 3 A (Buck 1),
2 A (Buck 2 and 3) - Maximum Current: 3.5 A (Buck 1),
2.5 A (Buck 2 and 3) - Adjustable Switching Frequency
300 kHz to 2.2 MHz Set by External Resistor - Dedicated Enable for Each Buck
- External Synchronization Pin for Oscillator
- External Enable/Sequencing and Soft-Start Pins
- Adjustable Current Limit Set By External Resistor
- Soft-Start Pins
- Current-Mode Control With Simple Compensation Circuit
- Powergood
- Optional Low-Power Mode Operation for Light Loads
- VQFN Package, 40-Pin 6 mm × 6 mm RHA
The TPS65251 features three synchronous wide input range high efficiency buck converters. The converters are designed to simplify its application while giving the designer the option to optimize their usage according to the target application.
The converters can operate in 5-, 9-, 12- or 15-V systems and have integrated power transistors. The output voltage can be set externally using a resistor divider to any value between 0.8 V and close to the input supply. Each converter features enable pin that allows a delayed start-up for sequencing purposes, soft-start pin that allows adjustable soft-start time by choosing the soft-start capacitor, and a current limit (RLIMx) pin that enables designer to adjust current limit by selecting an external resistor and optimize the choice of inductor. The current mode control allows a simple RC compensation.
The switching frequency of the converters can either be set with an external resistor connected to ROSC pin or can be synchronized to an external clock connected to SYNC pin if needed. The switching regulators are designed to operate from 300 kHz to 2.2 MHz. 180° out of phase operation between Buck 1 and Buck 2, 3 (Buck 2 and 3 run in phase) minimizes the input filter requirements.
TPS65251 features a supervisor circuit that monitors each converter output. The PGOOD pin is asserted once sequencing is done, all PG signals are reported and a selectable end of reset time lapses. The polarity of the PGOOD signal is active high.
TPS65251 also features a light load pulse skipping mode (PSM) by allowing the LOW_P pin tied to V3V. The PSM mode allows for a reduction on the input power supplied to the system when the host processor is in standby (low-activity) mode.
技術文件
| 類型 | 標題 | 日期 | ||
|---|---|---|---|---|
| * | Data sheet | TPS65251 4.5-V to 18-V Input, High-Current, Synchronous Step-Down Three Buck Switcher With Integrated FET datasheet (Rev. G) | PDF | HTML | 2018年 2月 16日 |
| EVM User's guide | TPS65251 Buck Converter Evaluation Module User's Guide (Rev. B) | PDF | HTML | 2021年 5月 26日 | |
| Application note | Measure Power Stage Gain and Slope Compensation in PCM (Peak Current Mode) BUCK (Rev. A) | PDF | HTML | 2019年 4月 1日 | |
| Selection guide | Power Management Guide 2018 (Rev. R) | 2018年 6月 25日 | ||
| Application note | TPS65250/1/2/3 LAYOUT GUIDE | 2013年 1月 15日 | ||
| Application note | TPS65250/1/2/3 Output Filter Selection Guidelines | 2013年 1月 15日 |
設計與開發
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TPS65251EVM — 適用於 TPS65251 (具有 3 個 DC/DC 轉換器的 PMU，輸入電壓高達 18Vin) 的評估模組
The TPS65251EVM is designed to help the user easily evaluate and test the operation and functionality of the TPS65251 buck converters (3-ch DC/DC; Ch1: 1.2 V, 3 A; Ch2: 1.8 V, 2 A; Ch3: 3.3 V, 2 A). The EVM converts a 4.5-V to 18-V input voltage designed to a regulated Ch1 = 1.2 V, Ch2 = 1.8 V, Ch3 (...)
TPS65251 Unencrypted PSpice Transient Model Package (Rev. A)
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TIDA-00782 — 使用 DLP® 技術的可攜式、高亮度 HD 投影顯示參考設計
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| VQFN (RHA) | 40 | Ultra Librarian |
訂購與品質
- 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
- 晶圓廠位置
- 組裝地點