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.