LM27402
- Wide Input-Voltage Range of 3 V to 20 V
- Inductor DCR or Shunt Resistor Based Overcurrent Protection
- 0.6-V Reference With ±1% FB Accuracy Across Full –40°C to 125°C Junction Temperature Range
- Switching Frequency from 200 kHz to 1.2 MHz
- Output Voltage as High as 95% of Input Voltage
- Integrated High-Current MOSFET Drivers
- Internal VDD Bias Supply LDO Subregulator
- External Clock Synchronization
- Adjustable Soft Start With External Capacitor
- Prebiased Start-up Capability
- Power Supply Tracking
- Voltage-Mode Control With Line Feedforward
- Open-Drain Power-Good Indicator
- Precision Enable With Hysteresis
- 16-Pin HTSSOP and WQFN Packages
- Create a Custom Design Using the LM27402 With the WEBENCH® Power Designer
The LM27402 is a voltage-mode, synchronous, DC/DC step-down controller with lossless inductor DCR current sensing capability. Sensing the inductor current eliminates the need to add resistive powertrain elements, which increases overall efficiency and facilitates accurate, continuous current sensing. A 0.6-V ±1% voltage reference enables high accuracy and low voltage capability at the output. An input operating voltage range of 3 V to 20 V makes the LM27402 suitable for a large variety of input rails.
The LM27402 voltage-mode control loop incorporates input voltage feed forward to maintain stability throughout the entire input-voltage range. The switching frequency is adjustable from 200 kHz to
1.2 MHz. Dual, high-current, integrated MOSFET drivers support large QG, low RDS(on) power MOSFETs. A power-good indicator provides power-rail-sequencing capability and output fault detection. An adjustable external soft start limits inrush current and provides monotonic output control during start-up. Other features include external tracking of other power supplies, integrated LDO bias supply, and synchronization capability.
技術文件
| 重要文件 | 類型 | 標題 | 格式選項 | 日期 |
|---|---|---|---|---|
| * | Data sheet | LM27402 High-Performance Synchronous Buck Controller With DCR Current Sensing datasheet (Rev. K) | PDF | HTML | 2018年 2月 23日 |
| Certificate | LM27402SQEVAL EU RoHS Declaration of Conformity (DoC) (Rev. A) | 2022年 3月 8日 | ||
| Selection guide | Power Management Guide 2018 (Rev. R) | 2018年 6月 25日 | ||
| Analog Design Journal | Common mistakes made in controller designs for power converters | 2018年 3月 26日 | ||
| Application brief | Using DC/DC Controllers to Improve Bitcoin Miner Designs | 2018年 3月 15日 | ||
| Analog Design Journal | Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics | 2016年 7月 21日 | ||
| Technical article | High Density PCB Layout of DC/DC Converters, Part 2 | PDF | HTML | 2015年 9月 16日 | |
| Technical article | High Density PCB Layout of DC/DC Converters, Part 1 | PDF | HTML | 2015年 9月 12日 | |
| Application note | AN-2060 LM27402 Current Limit Application Circuits (Rev. A) | 2013年 5月 6日 | ||
| Application note | Current Limit Foldback Improves Short Circuit Protection in LM274X Family (Rev. B) | 2013年 4月 23日 |
設計與開發
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LM27402SQEVAL — LM27402 評估板
The LM27402 evaluation board represents a 20A typical application circuit. The application circuit is optimized for an input voltage of 12V. However, input voltage feed-forward technology allows the evaluation board to operate up to 20V while maintaining a stable output voltage of 1.5V at 20A. (...)
LM27402 TINA-TI Transient Reference Design (Load Tran)
LM27402 TINA-TI Transient Reference Design (Startup)
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| HTSSOP (PWP) | 16 | Ultra Librarian |
| WQFN (RUM) | 16 | 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
- 進行中的可靠性監測
- 晶圓廠位置
- 組裝地點
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。