Low-Noise Regulated Switched-Capacitor Voltage Inverter Electronic components BOM Integrated circuit IC LM27761DSGR

Product Descriptions

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 250mA 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 PERCENT 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.

Product Features

• 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 PERCENT 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

Product Applications

• Operational Amplifier Power

• Wireless Communication Systems

• Cellular-Phone Power-Amplifier Biasing

• Interface Power Supplies

• Handheld Instrumentation

• Hi-Fi Headphone Amplifiers

• Powering Data Converters

Specifications

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