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SI8540 Datasheet(PDF) 1 Page - Silicon Laboratories |
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SI8540 Datasheet(HTML) 1 Page - Silicon Laboratories |
1 / 18 page Rev. 1.2 8/13 Copyright © 2013 by Silicon Laboratories Si8540 Si8540 HIGH-SIDE CURRENT SENSE AMPLIFIER Features Applications Description The Si8540 is a unidirectional, 36 V (max), high-side current sense amplifier for use in applications requiring current monitoring and/or control. This device draws bias current from the high-side line to which it is attached, eliminating the need for an external supply. It measures current from 0.1 to 10 A by sensing the voltage across an external sense resistor (or PCB trace) from dc to 20 kHz and can achieve measurement accuracies of 0.2% (typical) at full load. The device output is a current signal proportional to measured current and is easily converted to a scaled voltage using a single external resistor. The Si8540 is available in compact SOT-23 package. Functional Block Diagram Complete, unidirectional high-side current sense capability 0.2% full-scale accuracy +5 to +36 V supply operation 85 dB power supply rejection 90 µA max supply current 9 µA shutdown current Operating Temperature Range: –40 to +85 °C 5-pin SOT-23 package RoHS-compliant Battery chargers Smart battery packs DC motor control Backup systems Current control applications Si8540 ROUT VSOURCE RSENSE RG2 RG1 VOUT ILOAD Patents pending Ordering Information: See page 12. Pin Assignments 5-Pin SOT-23 SOT-23 1 5 4 3 2 RG1 SHDN GND RG2 OUT |
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