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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 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 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-? 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

Actual product photos

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