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.