1 Features
• Wide Common-Mode Range: 0 V to 36 V
• Selectable Response Times:
– 10 μs, 50 μs, 100 μs
• Programmable Threshold:
– Adjust Using Single Resistor
– Programmable From 0 mV to 250 mV
• Accuracy:
– Offset Voltage: ±500 μV (Maximum)
– Offset Voltage Drift: 0.5 μV/°C (Maximum)
• Selectable Hysteresis:
– 2 mV, 4 mV, 8 mV
• Active Quiescent Current: 135 μA (Maximum)
• Selectable Disable Mode
– Disabled Quiescent Current: 3.5 μA (Maximum)
– Disabled Input Bias Current: 500 nA
(Maximum)
• Open-Drain Output With Latch Mode Available

2 Applications
• Overcurrent Protection
• Computers
• Servers
• Telecom Equipment
• Power Supplies
• Battery Chargers

3 Description
Designed for overcurrent protection applications, the
INA300 is a current-sensing comparator that detects
overcurrent by measuring the voltage developed
across a shunt resistor, and comparing that voltage
to the threshold voltage input level. The device
measures this differential voltage signal on commonmode
voltages that can vary from 0 V up to 36
V, independent of the supply voltage. The INA300
device features an adjustable threshold range that
is set using a single external limit-setting resistor.
A selectable hysteresis feature enables adjustable
operation of the comparator to accommodate the wide
input signal range of 0 mV to 250 mV.
An open-drain alert output on the device can be
configured to operate in either a transparent mode
where the output status follows the input state, or in a
latched mode where the alert output is cleared when
the latch is cleared. The device response time setting
is selectable, which enables overcurrent alerts to be
issued in as fast as 10 μs.
The INA300 device operates from a single 2.7-V to
5.5-V supply, drawing a maximum supply current of
135 μA. The INA300 device is specified over the
extended operating temperature range of –40°C to
+125°C, and is available in WSON-10 and VSSOP-10
packages.