LM27761
- Inverts and Regulates the Input Supply Voltage
- Low Output Ripple
- Shutdown Lowers Quiescent Current to 7 µA (Typical)
- Up to 250-mA Output Current
- 2.5-Ω Inverter Output Impedance, VIN = 5 V
- ±4% Regulation at Peak Load
- 370-µA Quiescent Current
- 2-MHz (Typical) Low-Noise Fixed-Frequency Operation
- 35-dB (Typical) LDO PSRR at 2 MHz
With 80-mA Load Current - 30-mV LDO Dropout Voltage at 100 mA,
VOUT = –5 V - Current Limit and Thermal Protection
- Create a Custom Design Using the LM27761 With the WEBENCH® Power Designer
The LM27761 low-noise regulated switched-capacitor voltage inverter delivers a very low-noise adjustable output for an input voltage in the range of 2.7 V to 5.5 V. Four low-cost capacitors are used in the application solution to provide up to 250 mA of output current. The regulated output for the device is adjustable between −1.5 V and −5 V. The LM27761 operates at 2-MHz (typical) switching frequency to reduce output resistance and voltage ripple. With an operating current of only 370 µA (charge-pump power efficiency greater than 80% with most loads) and 7-µA typical shutdown current, the LM27761 provides ideal performance when driving power amplifiers, DAC bias rails, and other high-current, low-noise voltage applications.
技術文件
| 類型 | 標題 | 日期 | ||
|---|---|---|---|---|
| * | Data sheet | LM27761 Low-Noise, Regulated, Switched-Capacitor Voltage Inverter datasheet (Rev. C) | PDF | HTML | 2017年 1月 25日 |
| Application note | Quick Reference Guide To TI Buck Switching DC/DC Application Notes (Rev. B) | PDF | HTML | 2022年 5月 23日 | |
| Technical article | Low-noise charge pumps make it easy to create negative voltages | PDF | HTML | 2017年 8月 30日 | |
| Technical article | The top three ways to split a voltage rail to a bipolar supply | PDF | HTML | 2016年 12月 27日 | |
| Technical article | Pump it up quietly | PDF | HTML | 2016年 2月 19日 | |
| EVM User's guide | Using the LM27761EVM Evaluation Module | 2015年 12月 4日 | ||
| White paper | The Forgotten Converter | 2015年 6月 15日 |
設計與開發
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