INA745x 40V, 16-Bit, Precision I2C Output Digital Power Monitor With EZShunt™

Technology

1 Features

• Low loss integrated shunt resistor

– Internal resistance: 800µΩ, TA = 25°C

– Continuous current: ±35A, TA = 25°C

– Peak measurement capability: ±39.32A

• Current monitoring accuracy: A/B Grade

(maximum)

– Offset current: ±6.25mA / ±62.5mA

– Offset drift: ±30µA/°C (A and B Grades)

– System gain error: ±0.75% / ±1.25%

– Common-mode rejection: ±0.125 / ±1.25mA/V

• Power monitoring accuracy: A/B Grade,

(maximum)

– ±0.9% / ±1.6% at 25°C, full scale

• Energy and charge accuracy: A/B Grade,

(maximum)

– ±1.4% / ±2.1% at 25°C, full scale

• Temperature sensor: ±1.5°C (maximum at 25°C)

• Precision oscillator: ±0.5% (maximum at 25°C)

• Programmable conversion time and averaging

• 2.94MHz high-speed I2C interface with 16 pin-

selectable addresses

• Operates from a 2.7V to 5.5V supply:

– Operational current: 640µA (typical)

– Shutdown current: 5µA (maximum)

2 Applications

• Power delivery

• Grid infrastructure

• Industrial battery packs

• Test equipment

• Telecom equipment

• Enterprise servers

3 Description

The INA745x is a digital power monitor with an

integrated current sensing element along with a 16-

bit delta-sigma ADC specifically designed for current-

sensing applications. The device can measure full-

scale currents up to ±39.32A with common-mode

voltage support from –0.1V to +40V.

The INA745x reports current, bus voltage, die

temperature, power, energy and charge accumulation

while employing a precision ±0.5% integrated

oscillator, all while performing the needed calculations

in the background. The integrated temperature sensor

is ±2.5°C accurate over the junction temperature

range.

The low offset and gain drift design of the INA745x

allows the device to be used in precise systems that

do not undergo multi-temperature calibration during

manufacturing.

The device allows for selectable ADC conversion

times from 50µs to 4.12ms as well as sample

averaging from 1x to 1024x, which further helps

reduce the noise of the measured data.

Package Information

PART NUMBER

PACKAGE(1)

PACKAGE

SIZE(2)

INA745A, INA745B REL (QFN, 14)

5.00mm × 3.00mm

(1)

For all available packages, see Section 11.

(2)

The package size (length × width) is a nominal value and

includes pins, where applicable.

GND

16 – bit ADC

V

I

Common-mode Voltage

(-0.1V to 40V)

TI Device

IS+

IS-

±0.5% Oscillator

VBUS

IN+

IN-

SH+

SH-



Power

Current

Bus Voltage

Temperature

Energy

Charge

Alert_Diag

Shunt TC

Compensation

Registers

V

I

I

2C / SMBus

Interface

A0

A1

ALERT

SDA

SCL

0.1µF

VS

Supply Voltage

(2.7V to 5.5V)

Simplified Block Diagram

INA745A, INA745B

SBOSAC3B – JULY 2023 – REVISED AUGUST 2025

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.