INA239-Q1
SLYS028A – MAY 2020 – REVISED JUNE 2021
INA239-Q1 AEC-Q100, 85-V, 16-Bit, High-Precision Power Monitor With SPI Interface
1 Features
3 Description
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AEC-Q100 qualified for automotive applications:
– Temperature grade 1: –40°C to +125°C, TA
Functional Safety-Capable
– Documentation available to aid functional safety
system design
The INA239-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.
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High-resolution, 16-bit delta-sigma ADC
Current monitoring accuracy:
– Offset voltage: ±5 µV (maximum)
– Offset drift: ±0.02 µV/°C (maximum)
– Gain error: ±0.1% (maximum)
– Gain error drift: ±25 ppm/°C (maximum)
– Common mode rejection: 140 dB (minimum)
Power monitoring accuracy:
The INA239-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.
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– 0.7% 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:
The low offset and gain drift design of the INA239-
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.
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±163.84 mV / ±40.96 mV
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Input bias current: 2.5 nA (maximum)
Temperature sensor: ±1°C (maximum at 25°C)
Programmable conversion time and averaging
10-MHz SPI communication interface
Operates from a 2.7-V to 5.5-V supply:
– Operational current: 640 µA (typical)
– Shutdown current: 5 µA (maximum)
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.
2 Applications
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Automotive battery management systems
EV / HEV A - KA sense applications
DC/DC converters and power inverters
ADAS domain controllers
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
INA239-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.
VS
Power
Reference
IN+
IN-
SCLK
Voltage Current
Power
Temp
MOSI
MISO
CS
16 Bit
ADC
MUX
SPI
VBUS
+
Oscillator
Out-of-range
Threshold
ALERT
œ
GND
Simplified Block Diagram
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.