SI8540 Datasheet, PDF (1/18 Pages) List of Unclassifed Manufacturers – HIGH-SIDE CURRENT SENSE AMPLIFIER

Si8540
HIGH-SIDE CURRENT SENSE AMPLIFIER
Features
 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
Applications
 Battery chargers
 Smart battery packs
 DC motor control
 Backup systems
 Current control 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
5-Pin SOT-23
Ordering Information:
See page 12.
Pin Assignments
RG1 1
5 RG2
GND ²
SHDN
3
4
SOT-23
OUT
V_SOURCE
R_SENSE
Patents pending
I_LOAD
R_G1
R_G2
Rev. 1.2 8/13
Si8540
R_OUT
V_OUT
Copyright © 2013 by Silicon Laboratories
Si8540