INA300 Overcurrent-Protection, Current-Sense Comparator

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 common-

mode 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.

Device Information

PART NUMBER

PACKAGE(1)

BODY SIZE (NOM)

INA300

WSON (10)

2.00 mm × 2.00 mm

VSSOP (10)

3.00 mm × 3.00 mm

(1)

For all available packages, see the package option

addendum at the end of the data sheet.

GPIO

GPIO

Processor

DAC

GPIO

CBYPASS

0.1 µF

2.7 V to 5.5 V

Power Supply

(0 V to 36 V)

Load

RLIMIT

RPull-up

10 k

VS

IN+

IN

+

±

CMP

LIMIT

LATCH

DELAY

ALERT

INA300

GND

ENABLE

HYS

Typical Application Schematic

INA300

SBOS613C – FEBRUARY 2014 – REVISED JUNE 2021

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.