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INA381A4IDGST

26-V, 350-kHz current sense amplifier with integrated over-current comparator

Manufacturer:

Texas Instruments, Inc
Mfr.Part #:

INA381A4IDGST
Datasheet:

INA381A4IDGST Datasheet (PDF)
Series:

Zero-Drift
Function:

Current Sense
Sensing Method:

High/Low-Side
Accuracy:

±1%
EDA/CAD Models:

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INA381A4IDGST General Description

The INA381 includes both a 26-V common-mode, current-sensing amplifier and a high-speed comparator. This device detects overcurrent conditions by measuring the voltage developed across a current-shunt resistor and comparing that voltage to a user-defined threshold limit set by the comparator reference pin. The current-shunt monitor can measure differential voltage signals on common-mode voltages that vary from –0.2 V up to 26 V, independent of the supply voltage.

The open-drain alert output can be configured to operate in two modes: transparent or latched. In transparent mode, the output status follows the input state. In latched mode, the alert output is cleared only when the latch is reset. The standalone comparator large-signal alert response time is less than 2 µs, allowing for quick detection of overcurrent events. The total system overcurrent protection response time provided by the INA381 is less than 10 µs.

This device operates from a single 2.7-V to 5.5-V supply, drawing a maximum supply current of 350 µA. The device is specified over an operating temperature range of –40°C to +125°C, and is available in 8-pin WSON and 10-pin VSSOP packages.

Key Features

Common-mode input range: –0.2 V to +26 V
High accuracy amplifier:
- Offset voltage at T_A = 25°C
  - 500 µV (maximum) at V_CM = 12 V
  - 150 µV (maximum) at V_CM = 0 V
- Offset voltage drift: 1 µV/°C (maximum)
- Gain error: 1% (maximum) at 25°C
- Gain error drift: 20 ppm/°C (maximum)
Available amplifier gains:
- INA381A1: 20 V/V
- INA381A2: 50 V/V
- INA381A3: 100 V/V
- INA381A4: 200 V/V
Open-drain comparator:
- Hysteresis: 50 mV
- Propagation delay: 400 ns (typ)
- Alert threshold set through external reference voltage
- Supports transparent and latching modes
Packages: VSSOP-10 and WSON-8

Specifications

Category	Integrated Circuits (ICs)Power Management (PMIC)Current Regulation/Management	Series	Zero-Drift
Function	Current Sense	Sensing Method	High/Low-Side
Accuracy	±1%	Voltage - Input	0V ~ 26V
Current - Output	-	Operating Temperature	-40°C ~ 125°C (TA)
Mounting Type	Surface Mount	Base Product Number	INA381
Product type	Analog output with integrated comparator	Common-mode voltage (max) (V)	26
Common-mode voltage (min) (V)	-0.2	Input offset (±) (max) (µV)	150
Input offset drift (±) (typ) (µV/°C)	0.1	Voltage gain (V/V)	20, 50, 100, 200
CMRR (min) (dB)	84	Bandwidth (kHz)	105, 150, 210, 350
Supply voltage (max) (V)	5.5	Supply voltage (min) (V)	2.7
Iq (max) (mA)	0.45	Number of channels	1
Comparators (#)	1	Gain error (%)	1
Gain error drift (±) (max) (ppm/°C)	20	Slew rate (V/µs)	2
Features	Alert Function, Low-side Capable	Rating	Catalog
Operating temperature range (°C)	-40 to 125	feature-number-of-channels-per-chip	1
feature-rail-to-rail	No	feature-process-technology
feature-typical-response-time-range-us		feature-output-type	Open Drain
feature-maximum-operating-supply-voltage-v	5.5	feature-maximum-input-offset-voltage-mv	0.5@5V
feature-maximum-input-bias-current-ua	80(Typ)	feature-maximum-supply-current-ma
feature-packaging	Tape and Reel	feature-rad-hard
feature-pin-count	10	feature-cecc-qualified
feature-esd-protection		feature-escc-qualified
feature-military	No	feature-aec-qualified	No
feature-aec-qualified-number		feature-eccn-code	EAR99
feature-svhc		feature-svhc-exceeds-threshold	No