1 Features

• AEC-Q100 qualified for automotive applications:

• Functional Safety-Capable

– Documentation available to aid functional safety

system design

• High-resolution, 16-bit delta-sigma ADC

• Current monitoring accuracy:

– Offset voltage: ±50 µV (maximum)

– Offset drift: ±0.02 µV/°C (maximum)

– Gain error: ±0.3% (maximum)

– Gain error drift: ±50 ppm/°C (maximum)

– Common mode rejection: 120 dB (minimum)

• Power monitoring accuracy:

– 1.6% full scale, –40°C to +125°C (maximum)

• Fast alert response: 75 μs

• Wide common-mode range: –0.3 V to +85 V

• Bus voltage sense input: 0 V to 85 V

• Shunt full-scale differential range:

±163.84 mV / ±40.96 mV

• Input bias current: 2.5 nA (maximum)

• Temperature sensor: ±1°C (maximum at 25°C)

• Programmable conversion time and averaging

selectable addresses

• Operates from a 2.7-V to 5.5-V supply:

– Operational current: 640 µA (typical)

– Shutdown current: 5 µA (maximum)

2 Applications

• Automotive battery management systems

• EV / HEV A - KA sense applications

• DC/DC converters and power inverters

• ADAS domain controllers

3 Description

The INA237-Q1 is an ultra-precise digital power

monitor with a 16-bit delta-sigma ADC specifically

designed for current-sensing applications. The device

can measure a full-scale differential input of ±163.84

mV or ±40.96 mV across a resistive shunt sense

element with common-mode voltage support from –

0.3 V to +85 V.

The

INA237-Q1

reports

current,

bus

voltage,

temperature,

and

power,

all

while

performing

the needed calculations in the background. The

integrated temperature sensor is ±1°C accurate

for die temperature measurement and is useful in

monitoring the system ambient temperature.

The low offset and gain drift design of the INA237-

Q1 allows the device to be used in precise systems

that do not undergo multi-temperature calibration

during manufacturing. Further, the very low offset

voltage and noise allow for use in A to kA sensing

applications and provide a wide dynamic range

without significant power dissipation losses on the

sensing shunt element. The low input bias current

of the device permits the use of larger current-

sense resistors, thus providing accurate current

measurements in the micro-amp range.

The device allows for selectable ADC conversion

times from 50 µs to 4.12 ms as well as sample

averaging from 1x to 1024x, which further helps

reduce the noise of the measured data.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

INA237-Q1

VSSOP (10)

3.00 mm × 3.00 mm

(1)

For all available packages, see the package option

addendum at the end of the data sheet.

Oscillator

Voltage

Current

Power

Temp

+

±

SCL

SDA

A0

A1

VS

Power

GND

ALERT

IN+

IN-

VBUS

I

16 Bit

ADC

Reference

Out-of-range

Threshold

MUX

Simplified Block Diagram

INA237-Q1

SBOSA27A – JUNE 2020 – REVISED JUNE 2021

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.