SI8540-B-FWR Silicon Labs

LOAD Si8540 HIGH-SIDE CURRENT SENSE AMPLIFIER Features Complete, unidirectional high-side 90 A max supply current current sense capability 9 A shutdown current 0.2% full-scale accuracy Operating Temperature Range: +5 to +36 V supply operation 40 to +85 C 85 dB power supply rejection 5-pin SOT-23 package RoHS-compliant Applications Battery chargers Backup systems 5-Pin SOT-23 Smart battery packs Current control applications DC motor control Ordering Information: See page 12. Description The Si8540 is a unidirectional, 36V (max), high-side current sense Pin Assignments 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 RG1 1 5 RG2 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 2 GND signal proportional to measured current and is easily converted to a scaled voltage using a single external resistor. The Si8540 is available in SHDN 3 4 OUT compact SOT-23 package. SOT-23 Functional Block Diagram R SENSE Patents pending I LOAD V SOURCE R G1 R G2 Si8540 V OUT R OUT Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com Rev. 1.2 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice November 18, 2021Si8540 2 Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com Rev. 1.2 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice November 18, 2021