INA302 Datasheet, PDF (1/6 Pages) Texas Instruments – Overcurrent Protection, High-Speed Precision, Current-Sense Amplifier

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INA302, INA303
SBOS775 – SEPTEMBER 2016
INA30x 36-V, Overcurrent Protection, High-Speed Precision, Current-Sense Amplifier With
Dual Integrated Comparators
1 Features
•1 Wide Common-Mode Input Range: 0 V to 36 V
• Amplifier and Dual Comparator Outputs:
– INA302: Two Overlimit Alerts
– INA303: Window Comparator
– Threshold Levels Set Individually
– Comparator 1 Alert Response: 1 µs
– Comparator 2 Adjustable Delay: 3 µs to 10 s
– Open-Drain Outputs With Independent Latch
Control Modes
• High Accuracy Amplifier:
– Offset Voltage: 35 µV (Max)
– Offset Voltage Drift: 0.5 µV/°C (Max)
– Gain Error: 0.1% (Max)
– 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 Controls
• Power-Supply Protection
• Computers and Servers
• Telecom Equipment
3 Description
The INA302 and INA303 include a high common-
mode, bidirectional current-sensing amplifier and two
high-speed comparators. The INA302 comparators
are configured to detect and respond to overcurrent
conditions. The INA303 comparators are configured
to respond to both over- and undercurrent conditions.
The device features an adjustable limit threshold
range for each comparator set using an external limit-
setting resistor. This current-shunt monitor can
measure differential voltage signals on common-
mode voltages that can vary from 0 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 3 µs to 10 s.
This device operates from a single 2.7-V to 5.5-V
supply, drawing a maximum supply current of 950 μA.
The device is specified over the extended operating
temperature range (–40°C to +125°C), and is
available in a 14-pin TSSOP package.
PART NUMBER
INA30x
Device Information
PACKAGE
BODY SIZE
TSSOP (14)
4.40 mm × 5.00 mm
Supply
(0V to 36V)
Load
Typical Application
+2.7V to 5.5V
CBYPASS
0.1 PF
INA302
(INA303)
IN+ ₊
IN-
VS
COMP1
LIMIT1
+
ALERT1
LATCH1
RLIMIT1
COMP2
OUT
- (+)
ALERT2
+ (-)
LATCH2
DELAY
RPUL L -U P
10k
Microcontroller
GPIO
GPIO
ADC
GPIO
GPIO
GND
LIMIT2
CD EL AY
Reference
Voltage
RLIMIT2
1
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. ADVANCE INFORMATION for pre-production products; subject to
change without notice.