Amplifiers and comparators shrink space requirements

Smaller personal electronics, enterprise, industrial and communications designs can be achieved with the INA185 current-sense amplifier, and open-drain TLV4021 and push-pull TLV4041 comparators, claims Texas Instruments.

The INA185 is claimed to be the industry’s smallest current-sense amplifier in a leaded package and the TLV4021 and push-pull TLV4041, with an internal 1.2 or 0.2V reference, are claimed to be the smallest, most accurate comparators. In addition, says Texas Instruments, pairing the amplifier with one of the comparators produces the smallest, highest performing overcurrent detection solution in the industry.

The INA185 current-sense amplifier achieves more precision in less space, says the company. It is offered in a small-outline transistor (SOT)-563 package (1.6 x 1.6mm or 2.5mm2), making it 40 per cent smaller than the closest competitive leaded packages, says Texas Instruments.

It has a 55 microV input offset that enables higher precision measurements at low currents, and enables the use of lower-value shunt resistors to cut system power consumption. The 350kHz bandwidth and 2.0V/micro second slew rate enable phase-current reproduction to enhance motor efficiency and also save system power.

The matched resistive gain network enables a maximum gain error down to 0.2 per cent, which contributes to robust performance over temperature and process variations. The device’s typical response time of two micro seconds enables fast fault detection to prevent system damage.

The TLV4021 and TLV4041 comparators are available in a small die-size ball grid array (DSBGA) 0.73 x 0.73mm package. Both have an integrated voltage reference which saves board space and supports precise voltage monitoring to optimise system performance.

The comparators can monitor voltages down to 0.2V internal reference and feature a high threshold accuracy of one per cent across a full temperature range from -40 to +125 degrees C. Low 2.5 microA quiescent current delivers extended battery life for smart, connected devices, while a fast propagation delay (as low as 450 nano seconds) reduces latency and enables systems to monitor signals and respond quickly to fault conditions.

When used in combination, the INA185 and the TLV4021 or TLV4041, produce  the smallest, highest-performing overcurrent detection partnership, around 15 per cent smaller and 50 times faster than competitive devices, points out Texas Instruments.

Pairing the amplifier with one of the comparators to support overcurrent detection on rails as high as 26 V delivers more headroom to better manage current spikes, adds Texas Instruments.

TINA-TI SPICE models and reference designs to simulate system designs and predict circuit behaviour when using the INA185 current-sense amplifier and TLV4021 and TLV4041 comparators are available, together with evaluation modules, the INA185EVM and TLV4021-41EVM.

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