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SI8540 Datasheet, PDF (1/18 Pages) List of Unclassifed Manufacturers – HIGH-SIDE CURRENT SENSE AMPLIFIER | |||
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Si8540
HIGH-SIDE CURRENT SENSE AMPLIFIER
Features
ï® Complete, unidirectional high-side
current sense capability
ï® 0.2% full-scale accuracy
ï® +5 to +36 V supply operation
ï® 85 dB power supply rejection
ï® 90 µA max supply current
ï® 9 µA shutdown current
ï® Operating Temperature Range:
â40 to +85 °C
ï® 5-pin SOT-23 package
ï® RoHS-compliant
Applications
ï® Battery chargers
ï® Smart battery packs
ï® DC motor control
ï® Backup systems
ï® 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
VSOURCE
RSENSE
ILOAD
Patents pending
RG1
RG2
Rev. 1.2 8/13
Si8540
ROUT
VOUT
Copyright © 2013 by Silicon Laboratories
Si8540
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