INA381A1

Part: INA381 from Texas Instruments

Type: High-Speed Current Sense Amplifier with Integrated Comparator

Description: The INA381 is a 26-V common-mode, high-speed, current-sensing amplifier with an integrated comparator, operating from a 2.7-V to 5.5-V supply with 150 μV maximum offset voltage.

Operating Conditions:

• Supply voltage: 2.7 V to 5.5 V
• Operating temperature: -40 °C to +125 °C
• Common-mode input voltage: -0.2 V to 26 V

Absolute Maximum Ratings:

• Max supply voltage: 6 V
• Max junction temperature: 150 °C

Key Specs:

• Offset voltage, RTI: ±150 μV (maximum) at VIN+ = 0 V, VIN– = 0 V
• Offset voltage drift: 1 μV/°C (maximum) at TA= –40°C to +125°C
• Gain error: ±1% (maximum) at VOUT = 0.5 V to VS – 0.5 V
• Common-mode input range: –0.2 V to +26 V
• Quiescent current: 350 μA (maximum) at VSENSE = 10 mV, TA = +25°C
• Comparator propagation delay: 1 μs (maximum) for comparator only, CMPIN Input overdrive = 20 mV
• Available amplifier gains: 20 V/V, 50 V/V, 100 V/V, 200 V/V
• Bandwidth (INA381A1): 350 kHz (typical)

Features:

• Common-mode input range: –0.2 V to +26 V
• High accuracy amplifier: Offset voltage 150 μV (maximum) at VCM = 0 V, Gain error 1% (maximum) at 25°C
• Available amplifier gains: 20 V/V, 50 V/V, 100 V/V, 200 V/V
• Open-drain comparator with 50 mV hysteresis and 400 ns (typical) propagation delay
• Supports transparent and latching modes

Applications:

• Merchant network and server PSU
• Merchant DC/DC
• DC-input BLDC motor drive
• Cordless power tool
• Headsets, headphones and earbuds

Package:

• VSSOP-10 (3.00 mm × 3.00 mm)
• WSON-8 (2.00 mm × 2.00 mm)

• ¹ Common-mode input range: –0.2 V to +26 V
• High accuracy amplifier:
  • Offset voltage at T^A = 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

• Merchant network and server PSU
• Merchant DC/DC
• • DC-input BLDC motor drive
• Cordless power tool
• Headsets, headphones and earbuds

Pin Functions

at T^A = 25°C, VSENSE = VIN+ – VIN– = 10 mV, V^S = 5 V, VIN+ = 12 V, and CMPREF = 2 V (unless otherwise noted)

⁽¹⁾ RTI = referred-to-input.

⁽²⁾ Swing specifications are tested with an overdriven input condition.

6.6 Typical Characteristics

at T_A = 25 °C, V_S = 5 V, V_IN+ = 12 V, and alert pullup resistor = 10 k Ω (unless otherwise noted)

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over operating free-air temperature range (unless otherwise noted)(1)

⁽¹⁾ Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

over operating free-air temperature range (unless otherwise noted)

Product Folder Links: INA381

⁽²⁾ VIN+ and VIN– are the voltages at the IN+ and IN– pins, respectively.

⁽³⁾ Input voltage may exceed the voltage shown without causing damage to the device if the current at that terminal is limited to 5 mA.

⁽²⁾ JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.