INA301A2IDGKT Integrated Circuits (ICs)

Due to market price fluctuations,if you need to purchase or consult the price.You can contact us or emial to us:   sales@allicdata.com

1. Describe

The INA301A2IDGKT includes a high common mode current sense amplifier and a high speed comparator configured to detect overcurrent conditions by measuring the voltage developed across the current sense or shunt resistor and comparing this voltage to a defined threshold limit. The device features an adjustable limit threshold range that is set using a single external limit setting resistor. This shunt monitor measures differential voltage signals over a common-mode voltage range of 0 V to 36 V, independent of supply voltage. The open-drain alarm output can be configured to operate in transparent mode where the output state follows the input state, or in latched mode (the alarm output is cleared when the latch is reset). The device alarm response time is less than 1 µs for fast detection of overcurrent events. The device operates from a single 2.7V to 5.5V supply with a maximum supply current of 700µA. The device is specified over the extended operating temperature range (–40°C to +125°C) and is available in an 8-lead VSSOP package.

2. Feature

    1. Wide common-mode input range: 0 V to 36 V

    2. Dual outputs: amplifier and comparator outputs

    3. High Precision 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

    4. Available amplifier gains:

        – INA301A1: 20 V/V

        – INA301A2: 50 V/V

        – INA301A3: 100 V/V

    5. Programmable alarm threshold set by a single resistor

    6. Total alarm response time: 1 µs

    7. Open-drain output with latch mode

    8. Package: VSSOP-8

3. Application

    1. Overcurrent protection

    2. Power protection

    3. circuit breakers

    4. Computers and Servers

    5. Telecommunications equipment

    6. Battery management

4. Pin configuration

5. Pin Description

6. Application Information

The INA301A2IDGKT is designed for easy configuration to detect overcurrent conditions in applications. this The devices have unidirectional overcurrent detection for a single threshold, respectively. However, this Devices can also be paired with other devices and circuits to create more sophisticated monitoring functions piece.

7. Device functional mode

    1. Input filtering

        External system noise can significantly affect the comparator's ability to accurately measure and detect whether the input signal exceeds a reference threshold level, thereby reliably indicating an overrange condition. The most obvious effect of external noise on the operation of the comparator is to cause false alarms. If the comparator detects a large noise transient coupled into the signal, the device can easily interpret this transient as an overrange condition. External filtering helps reduce the amount of noise reaching the comparator and reduces the likelihood of false alarms. The cost of adding this noise filter is an increase in alarm response time because both the input signal and noise are filtered. It is important to limit the amount of input resistance used in this filter because this resistance can have a significant effect on the input signal reaching the input pins of the device due to the input bias current of the device. A typical system implementation involves placing the current sense resistor very close to the device, so the traces are very short and the trace impedance is very low. This layout helps reduce the ability to couple additional noise into the measurement. Under these conditions, the characteristics of the input bias current have minimal effect on device performance.

    2. Using the INA301 with Common Mode Transients Above 36 V

        With a small amount of additional circuitry, the device can be used in circuits with transient voltages higher than 36 V. Use only Zener diodes or Zener-type transient absorbers (sometimes called transzorbs). Any other type of transient absorber has an unacceptable time delay. It is best to keep these resistors as small as possible, preferably 10 Ω or less. Larger values can be used for additional inductive error due to less signal actually reaching the input pins of the device. Since this circuit only limits short-term transients, many applications are happy with a 10Ω resistor and the lowest power rated traditional Zener diode available. This combination uses minimal board space. These diodes can be found in packages as small as SOT-523 or SOD-523.