Texas Instruments LM27762正/负输出电荷泵
Texas Instruments LM27762正/负输出电荷泵提供±1.5V至±5V可调节、超低噪声正负输出。输入电压范围为2.7V-5.5V，输出电流高达±250mA。 LM27762的工作电流仅为390µA并且关断电流的典型值为0.5µA，因此可为功率放大器、数模转换器(DAC)偏置以及其他大电流、低噪声、负电压应用提供理想性能。 该器件采用小型解决方案尺寸，所需外部组件很少。 负电压由经过稳压的反相电荷泵生成，该电荷泵紧接一个低噪声、负电压LDO。 LM27762器件的反相电荷泵在2MHz（典型值）开关频率下运行，可减少输出阻抗和电压纹波。 正电压由低噪声正电压LDO的输入生成。
特性
- Generates low-noise adjustable positive supply voltage between 1.5V and 5V and a negative supply voltage between -1.5V and -5V
- Input voltage range 2.7V to 5.5V
- ±250mA output current
- Inverting charge pump followed by negative LDO
- 2MHz low-noise fixed-frequency operation
- 2.5Ω inverter output impedance, VIN=5V
- Negative LDO dropout voltage 30mV at 100mA, VOUT=–5V
- Positive LDO with 45mV dropout voltage at 100mA, VOUT=5V
- 390µA quiescent current (typ.)
- Shutdown quiescent current to 0.5µA (typ.)
- Current limit and thermal protection
- Power good pin (active low)
应用
- Hi-Fi audio headphone amplifiers
- Operational amplifier power biasing
- Powering data converters
- Wireless communication systems
- Interface power supplies
- Handheld instrumentation
Functional Block Diagram
Related Product
Texas Instruments LM27762EVM 电荷泵评估模块 (EVM)
评估 LM27762 的工作情况和性能，正/负输出电荷泵。
发布日期: 2016-10-27
| 更新日期: 2022-03-11