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Product details

Parameters

Common mode voltage (Max) (V) 26 Common mode voltage (Min) (V) -0.2 Input offset (+/-) (Max) (uV) 150 Input offset drift (+/-) (Typ) (uV/C) 0.2 Gain (V/V) 100, 20, 200, 50 Gain error (%) 1 Gain error drift (+/-) (Max) (ppm/°C) 20 CMRR (Min) (dB) 84 Bandwidth (kHz) 350, 210, 150, 105 Supply voltage (Max) (V) 5.5 Supply voltage (Min) (V) 2.7 Iq (Max) (mA) 0.5 Number of channels (#) 1 Comparators (#) 1 Features Alert Function, Low-side Capable Rating Catalog Operating temperature range (C) -40 to 125 open-in-new Find other Current sense amplifiers analog output

Package | Pins | Size

VSSOP (DGS) 10 9 mm² 3 x 3 WSON (DSG) 8 4 mm² 2 x 2 open-in-new Find other Current sense amplifiers analog output

Features

  • Common-mode input range: –0.2 V to +26 V
  • High accuracy amplifier:
    • Offset voltage at TA = 25°C
      • 500 µV (maximum) at VCM = 12 V
      • 150 µV (maximum) at VCM = 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

All trademarks are the property of their respective owners.

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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.

 

 

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Technical documentation

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARDS Download
document-generic User guide
$29.00
Description
The INA381 is a current sense monitor solution with an integrated comparator for detecting overcurrent conditions that provides ease of use and high performance for cost-sensitive applications.  The INA381EVM is intended to provide basic functional evaluation of the device family. The fixture (...)
Features
  • Evaluation of the INA381x in all gain options
  • Test points to allow ease of acess to device pins
  • Capability to evaluate both high- and low-side configurations

Design tools & simulation

SIMULATION MODELS Download
SBOMAL8.TSC (5235 KB) - TINA-TI Reference Design
SIMULATION MODELS Download
SBOMAL9.ZIP (40 KB) - TINA-TI Spice Model
SIMULATION MODELS Download
SBOMBC0.ZIP (29 KB) - PSpice Model
SIMULATION TOOLS Download
SPICE-based analog simulation program
TINA-TI TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
document-generic User guide
SIMULATION TOOLS Download
SBOC519.ZIP (10 KB)
SIMULATION TOOLS Download
SBOC520.ZIP (11 KB)

Reference designs

REFERENCE DESIGNS Download
High efficiency power supply architecture reference design for protection relay processor module
TIDA-010011 — This reference design showcases various power architectures for generating multiple voltage rails for an application processor module, requiring >1A load current and high efficiency . The required power supply is generated using 5-, 12- or 24-V DC input from the backplane. Power supplies are (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
VSSOP (DGS) 10 View options
WSON (DSG) 8 View options

Ordering & quality

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