LM27761 - switched capacitor voltage inverter with LDO. Free Technical Library News

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LM27761 Switched Capacitor Voltage Inverter with LDO

26.08.2016

Texas Instruments has introduced a new low voltage switched capacitor inverter. It provides very low noise at a regulated output for input voltages ranging from 2,7V to 5,5V.

Using four inexpensive capacitors, you can provide up to 250mA output current and -1,5V to -5V to power analog circuits, for example.

The LM27761 operates at 2 MHz to reduce output impedance and voltage ripple. With an operating current of 370 µA, the inverter delivers >80% efficiency and can be used in applications such as power amplifiers, DACs, and other applications requiring low output voltage noise.

Capabilities

Inverts and regulates the input supply voltage
Low output noise
Current consumption in off mode up to 7 μA (typ.)
Output current up to 250 mA
Inverter output impedance 2,5 ohm, at Vin = 5 V
Peak load regulation +- 4%
Current consumption 370 uA
Fixed frequency 2 MHz (typical) with low noise
LDO PSRR 35 dB (typical) at 2 MHz with 80 mA load current
Voltage drop across LDO 30mV, at 100mA, Vout= -5V
Current limit and thermal protection

Typical applications for LM27761:

Operational power amplifiers
Wireless communication systems
cellular
Power supplies
Portable measuring instruments
Amplifiers for Hi-Fi headphones
Data Converter Power

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