LM21212-1
- Integrated 7-mΩ high-side and 4.3-mΩ low-side FET switches
- 300-kHz to 1.5-MHz frequency SYNC pin
- Adjustable output voltage from 0.6 V to VIN (100% duty cycle capable), ±1% reference
- Input voltage range 2.95 V to 5.5 V
- Start-up Into prebiased loads
- Output voltage tracking capability
- Wide bandwidth voltage loop error amplifier
- Adjustable soft-start with external capacitor
- Precision enable (EN) pin with hysteresis
- Integrated OVP, OCP, OTP, UVLO and power-good
- Thermally enhanced HTSSOP-20 exposed pad package
- Create a custom design using the LM21212-1 with the WEBENCH® Power Designer
The LM21212-1 is a monolithic synchronous point-of-load buck regulator that is capable of delivering up to 12 A of continuous output current while producing an output voltage down to 0.6 V with outstanding efficiency. The device is optimized to work over an input voltage range of 2.95 V to 5.5 V, making it suited for a wide variety of low voltage systems. The voltage mode control loop provides high noise immunity, narrow duty-cycle capability and can be compensated to be stable with any type of output capacitance, providing maximum flexibility and ease of use.
The LM21212-1 features internal overvoltage protection (OVP) and overcurrent protection (OCP) for increased system reliability. A precision enable pin and integrated UVLO allow turnon of the device to be tightly controlled and sequenced. Start-up inrush currents are limited by both an internally fixed and externally adjustable soft-start circuit. Fault detection and supply sequencing are possible with the integrated power good circuit.
The LM21212-1 is designed to work well in multi-rail power supply architectures. The output voltage of the device can be configured to track an external voltage rail using the SS/TRK pin. The switching frequency can be synchronized to the falling edge of a clock between frequencies of 300 kHz to 1.5 MHz.
If the output is prebiased at start-up, it does not sink current, allowing the output to smoothly rise past the prebiased voltage. The regulator is offered in a 20-pin HTSSOP package with an exposed pad that can be soldered to the PCB, eliminating the need for bulky heat sinks.
技術文件
| 重要文件 | 類型 | 標題 | 格式選項 | 下載最新的英文版本 | 日期 | |
|---|---|---|---|---|---|---|
| * | 資料表 | LM21212-1 2.95-V To 5.5-V, 12-A, Voltage-Mode Synchronous Buck Regulator With Frequency Synchronization datasheet (Rev. F) | PDF | HTML | 2019/5/21 | ||
| 選擇指南 | Buck Converter Quick Reference Guide (Rev. B) | 2021/4/8 | ||||
| 選擇指南 | Power Management Guide 2018 (Rev. R) | 2018/6/25 |
設計與開發
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PMP7804 — 適用於 Kintex 7 應用的多重輸出電源參考設計
PMP7804 參考設計提供為 Xilinx® Kintex® 7 系列 FPGA 供電所需的所有電源軌。此設計運用 Simple Switcher 電源模組與 LM2121x 低電壓同步降壓穩壓器，不僅具備易用性，更能縮短設計週期。此設計針對 12V 輸入進行最佳化處理。
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| HTSSOP (PWP) | 20 | Ultra Librarian |
訂購與品質
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。