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.
●For all available packages, see the orderable addendum at the end of the data sheet.
● 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
