1 Features
• For VS = 5V, typical unless otherwise noted:
– Supply current at VCM = 0.3V: 400nA (max)
– Operating voltage range: 1.6V to 5.5V
– Low TCVOS: 3.5μV/°C (max)
– VOS: 1mV (max)
– Input bias current: 40fA
– PSRR: 109dB
– CMRR: 102dB
– Open-loop gain: 132dB
– Gain bandwidth product: 6.2kHz
– Slew rate: 2.4V/ms
– Input voltage noise at f = 100Hz: 255nV/√Hz
– Temperature range: −40°C to +125°C

2 Applications
• Wireless environmental sensors
• Grid asset monitoring
• Electricity meter
• Smoke and heat detector
• Gas detector
• Portable electronics
• Thermostat
• Field transmitter and sensor

3 Description
The LPV521 is a single, nanopower, 552nW amplifier
designed for ultra-long-life battery applications. The
operating voltage range of 1.6V to 5.5V coupled with
typically 351nA of supply current make this device
an excellent choice for RFID readers and remotesensor
nanopower applications. The device has an
input common-mode voltage 0.1V over the rails,
specified TCVOS, and voltage-swing-to-the-rail output
performance. The LPV521 has a carefully designed
CMOS input stage that outperforms competitors with
typically 40fA IBIAS currents. This low input current
significantly reduces IBIAS and IOS errors introduced in
megohm resistance, high-impedance photodiode and
charge sense applications. The LPV521 is a member
of the PowerWise® family, and has an exceptional
power-to-performance ratio.
The wide input common-mode voltage range,
specified 1mV VOS and 3.5μV/°C TCVOS enables
accurate and stable measurement for both high-side
and low-side current sensing.
EMI protection is designed into the device to reduce
sensitivity to unwanted RF signals from cell phones or
other RFID readers.
The LPV521 is offered in 5-pin SC70 and 8-pin PDIP
packages.