BD14220G-CTR

Overview

The BD14220G-CTR is a single-channel automotive current sense amplifier from Rohm Semiconductor, designed for high-precision current monitoring in vehicle systems. It operates on a single supply voltage ranging from 2.7 V to 5.5 V and features a wide common-mode voltage range of -14 V to +40 V. The device provides an analog voltage output with a fixed gain of 25 V/V. Key electrical specifications include a typical supply current of 240 µA, an input bias current of 1 µA, and an input offset voltage of 500 µV. It has a -3 dB bandwidth of 40 kHz and is housed in a compact 6-SSOP package.

Feature Summary

• High precision achieved through internal matching of gain resistors to minimize gain error and offset voltage variations across temperature changes.
• Robust input stage capable of withstanding negative voltages down to -14 V, supporting reverse voltage and reverse connection scenarios.
• Low power consumption with a typical operating current of 240 µA, suitable for energy-efficient automotive applications.
• Two-stage amplifier architecture utilizing chopper and auto-zero techniques to maintain accuracy without external noise filtering components.

Applications

• Current monitoring and protection in 5 V and 12 V power networks within body and drive control units.
• Overcurrent detection in automotive electronic control units (ECUs).
• Battery management systems requiring precise low-side or high-side current sensing.

Procurement Notes

Verify the specific suffix 'CTR' corresponds to the tape-and-reel packaging format containing 3,000 units per reel. Confirm that the AEC-Q100 Grade 1 qualification meets the thermal requirements of your target application, as the device is rated for an operating temperature range of -40°C to +125°C. Ensure compatibility with the 6-SSOP footprint during PCB layout.

Selection Notes

Select this component when a fixed gain of 25 V/V is required for current sensing applications. Consider alternative models within the BD1422xG-C series if different gain factors such as 50 V/V or 100 V/V are needed. This part is suitable for designs prioritizing space savings over magnetic sensors, provided the common-mode voltage does not exceed +40 V.

Part Context

This device belongs to the BD142xx series of high-precision automotive current sense amplifiers. The BD1422xG-C sub-series is specifically optimized for lower voltage environments up to +40 V, contrasting with the BD1423xFVJ-C series which supports up to +80 V. All variants share the same functional safety supportive design philosophy and aim to replace discrete operational amplifier solutions to reduce board area.

Replacement Considerations

Direct substitutes within the same family include BD14221G-CTR (Gain 50 V/V) and BD14222G-CTR (Gain 100 V/V). These parts share identical pinouts, packages, and electrical characteristics except for the internal gain setting.