1 Features

• Wide common-mode voltage:

– Operational voltage: −2V to +80V

– Survival voltage: −12V to +85V

• Bidirectional operation

• High small signal bandwidth: 650kHz (20V/V Gain)

• Slew rate: 2.5V/μs

• Step response settling time to 1%: 6.5μs

• High CMRR: 120dB

• Gain error (maximum) : ±0.25%, ±10ppm/°C drift

• Offset voltage (maximum): ±150μV, ±0.5μV/°C drift

• Operates from 2.7V to 12V supply

• Operational current: 650μA

• Available gains:

– INA299A1: 20V/V

– INA299A2: 50V/V

– INA299A3: 100V/V

• Package options: SOT23-6 (DBV)

2 Applications

• DC/DC Converter

• ESS battery management systems (BMS)

• Macro remote radio unit (RRU)

• 48V rack server

• 48V merchant network & server power supply

(PSU)

3 Description

The INA299 is a precise, bidirectional current sense

amplifier that can measure voltage drops across shunt

resistors over a wide common-mode range from –2V

to 80V, independent of the supply voltage. The highprecision

current measurement is achieved through a

combination of low offset voltage (±150μV, maximum),

small gain error (±0.25%, maximum) and a high

DC CMRR (typical 120dB). The INA299 is not only

designed for high voltage, bidirectional DC current

measurements, but also for high-speed applications

(such as transient detection and fast overcurrent

protection) with a high signal bandwidth of 650kHz

and fast settling time.

The INA299 operates from a single 2.7V to 12V

supply, drawing 650μA of supply current. The INA299

is available in three gain options: 20V/V, 50V/V,

100V/V. Multiple gain options allow for optimization

between available shunt resistor values and wide

output dynamic range requirements.

The INA299 is specified over operating temperature

range of −40°C to +125°C and is offered in a 6-pin

SOT-23 package.