BD14221G-C
Automotive Current Sense Amplifier
BD14221G-C
Automotive Current Sense Amplifier
The BD14221G-C is a current sense amplifier series. This device operates from a single 2.7V to 5.5V power supply. It has wide common mode voltage range from -14V to +40V, outputs analog voltage. The gain is 50 V/V. The matched gain resistor minimizes gain error and offset voltage. In additionally, the low input bias current is 1μA that reduces the offset on the path to shunt resistor.
Product Detail
Functional Safety:
Specifications:
Sensor Type
Current Sensor
Supply Voltage (Min.)[V]
2.7
Supply Voltage (Max.)[V]
5.5
Operating Current (Typ.)[mA]
0.24
Common Mode Voltage (Min.)[V]
-14
Common Mode Voltage (Max.)[V]
40
Gain (Typ.)[V/V]
50
Gain Accuracy (Max.)[%]
±1
Operating Temperature (Min.)[°C]
-40
Operating Temperature (Max.)[°C]
125
Package Size [mm]
2.9x2.8 (t=1.25)
Common Standard
AEC-Q100 (Automotive Grade)
Features:
- AEC-Q100 Qualified (Grade 1)
- Wide Common Mode Voltage Range
- High Accuracy
- Low Offset Voltage
- Low Input Bias Current
Reference Design / Application Evaluation Kit
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- Evaluation Board - BD14221G-EVK-001
BD14221G-EVK-001 is an evaluation board for BD14221G-LA, which is ROHM's current sense amplifier.
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- Reference Design - REF68012
- 30A Shunt-based current sensing (uni-direction) with CSA on 24V system
In the automotive and industrial equipment fields, current sensing circuits are essential for applications such as current feedback, overcurrent limitation, and battery level monitoring. The shunt-based current sensing circuit is the most standard circuit for current measurement and monitoring. ROHM provides solutions that leverage the resistor technology it has developed since its founding, as well as the analog and thermal design technologies it has cultivated over many years, contributing to improved system performance, higher power efficiency, and higher reliability through high-precision current sensing.
The components you select will vary depending on the power supply system and detection current value. We have a lineup of reference designs for 12V, 24V, and 48V systems, as well as current sensing values from 20 to 100A. We publish not only the schematic design guide but also thermal evaluation data for shunt resistors. Thermal issues are an important factor in shunt-based current sensing. Please use these as design references to help reduce design man-hours.
This reference design is designed for 30A, uni-direction current sensing on 24V systems.
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