INA745AIRELR datasheet(15/50 Pages) TI2

15 / 50 page

Figure 6-5. Maximum Pulse Current vs Pulse Duration (Single Event)

6.3.3 Versatile Measurement Capability

The INA745x operates off a 2.7V to 5.5V supply but can measure voltage and current on rails as high as

40V. The current is measured by sensing the voltage drop across an internal shunt resistor. The input stage

of the INA745x is designed such that the input common-mode voltage can be higher than the device supply

voltage, VS. The common-mode voltage range at the inputs is –0.1V to 40V to support both high-side and

low-side current measurements. There are no special considerations for power-supply sequencing because the

common-mode input range and device supply voltage are independent of each other; therefore the bus voltage

can be present with the supply voltage off (and reciprocally) without damaging the device.

The device also measures the bus supply voltage through the VBUS pin and temperature through the integrated

temperature sensor. The current is calculated from the voltage drop across the internal shunt resistor which is

sensed by the IN+ and IN– pins, while the bus voltage is measured with respect to device ground. Monitored bus

voltages can range from 0V to 40V, while monitored temperatures can range from –40°C to 150°C.

Shunt voltage, bus voltage, and internal temperature measurements are multiplexed internally to a single ADC

(see Figure 6-6).

IN+

VBUS

MUX digital

Control

Bus Voltage

Shunt Voltage

Temperature

ADC_IN+

ADC_IN-

To ADC Input

Integrated

Shunt

TEMP

Temperature

Sensor

IN+

SH+

Figure 6-6. High-Voltage Input Multiplexer

6.3.4 Internal Measurement and Calculation Engine

The current and charge are calculated from the voltage drop measured across the internal resistive element,

while the power and energy are calculated after a bus voltage measurement. Power and energy are calculated

based on the previous current calculation and the latest bus voltage measurement.

www.ti.com

INA745A, INA745B

SBOSAC3B – JULY 2023 – REVISED AUGUST 2025

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