1 Features
1• Generates Low-Noise Adjustable Positive Supply
Voltage Between 1.5 V and 5 V and Negative
Supply Voltage Between –1.5 V and –5 V
• Input Voltage Range 2.7 V to 5.5 V
• ±250-mA Output Current
• Inverting Charge Pump Followed by Negative
LDO
• 2-MHz Low-Noise Fixed-Frequency Operation
• 2.5-Ω Inverter Output Impedance, VIN = 5 V
• Negative LDO Dropout Voltage 30 mV at 100 mA,
VOUT = –5 V
• Positive LDO with 45-mV Dropout Voltage at 100
mA, VOUT = 5 V
• 390-μA Quiescent Current (Typical)
• Shutdown Quiescent Current to 0.5 μA (Typical)
• Current Limit and Thermal Protection
• Power Good Pin (Active Low)
• Create a Custom Design Using the LM27762 With
the WEBENCH® Power Designer

2 Applications
• Hi-Fi Audio Headphone Amplifiers
• Operational Amplifier Power Biasing
• Powering Data Converters
• Wireless Communication Systems
• Interface Power Supplies
• Handheld Instrumentation

3 Description
The LM27762 delivers very low-noise positive and
negative outputs that are adjustable between ±1.5 V
and ±5 V. Input-voltage range is from 2.7 V to 5.5 V,
and output current goes up to ±250 mA. With an
operating current of only 390 μA and 0.5-μA typical
shutdown current, the LM27762 provides ideal
performance for power amplifier and DAC bias and
other high-current, low-noise negative voltage needs.
The device provides a small solution size with few
external components.
Negative voltage is generated by a regulated
inverting charge pump followed by a low-noise
negative LDO. The inverting charge pump of the
LM27762 device operates at 2-MHz (typical)
switching frequency to reduce output resistance and
voltage ripple. Positive voltage is generated from the
input by a low-noise positive LDO.
Positive and negative outputs of LM27762 have
dedicated enable inputs. These outputs support
independent timing for the positive and negative rails
for specific system power-sequence needs. Enable
inputs can be also shorted together and connected to
the input voltage. The LM27762 has an optional
Power Good feature.