INA30x

OUT

IN+

IN-

Load

Supply

(0 V to 36 V)

RLIMIT1

+

GND

LATCH1

LIMIT1

+

ALERT2

LATCH2

LIMIT2

+

RLIMIT2

DELAY

CDELAY

VS

2.7 V to 5.5 V

RPULL-UP

10 k

CBYPASS

Reference Voltage

GPIO

GPIO

ADC

Microcontroller

GPIO

GPIO

-

( )

-

( )

+

COMP1

COMP2

0.1 …F

ALERT1

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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.

INA302, INA303

SBOS775C – SEPTEMBER 2016 – REVISED MARCH 2019

INA30x 36-V, Overcurrent Protection, Precision,

Current-Sense Amplifiers With Dual Integrated Comparators

1

1 Features

1

•

Wide common-mode input range: –0.1 V to +36 V

•

Dual comparator outputs:

–

INA302: Two independent overlimit alerts

–

INA303: Window comparator

–

Threshold levels set individually

–

Comparator 1 alert response: 1 µs

–

Comparator 2 adjustable delay: 2 µs to 10 s

–

Open-drain outputs with independent latch

control modes

•

High accuracy amplifier:

–

Offset voltage: 30 µV (max, A3 version)

–

Offset voltage drift: 0.5 µV/°C (max)

–

Gain error: 0.15% (max, A3 version)

–

Gain error drift: 10 ppm/°C

•

Available amplifier gains:

–

INA302A1, INA303A1: 20 V/V

–

INA302A2, INA303A2: 50 V/V

–

INA302A3, INA303A3: 100 V/V

2 Applications

•

Overcurrent protection

•

Motor control

•

Power-supply protection

•

Computers and servers

•

Telecom equipment

3 Description

The INA302 and INA303 (INA30x) devices feature a

high common-mode, bidirectional, current-sensing

amplifier and two high-speed comparators to detect

out-of-range

current

conditions.

The

INA302

comparators are configured to detect and respond to

overcurrent conditions. The INA303 comparators are

configured to respond to both overcurrent and

undercurrent conditions in a windowed configuration.

These devices feature an adjustable limit threshold

range for each comparator set using an external limit-

setting resistor. These current-shunt monitors can

measure differential voltage signals on common-

mode voltages that can vary from –0.1 V up to +36 V,

independent of the supply.

The open-drain alert outputs can be configured to

operate in either a transparent mode (output status

follows the input state), or in a latched mode (alert

output is cleared when the latch is reset). The alert

response time for comparator 1 is under 1 µs, and

the alert response for comparator 2 is set through an

external capacitor ranging from 2 µs to 10 s.

These devices operate from a single 2.7-V to 5.5-V

supply, drawing a maximum supply current of 950 μA.

The

devices

are

specified

over

the

extended

operating temperature range of –40°C to +125°C, and

are available in a 14-pin TSSOP package.

Device Information

PART NUMBER

PACKAGE

BODY SIZE (NOM)

INA302

TSSOP (14)

4.40 mm × 5.00 mm

INA303

(1) For all available packages, see the package option addendum

at the end of the data sheet.

Typical Application