Texas Instruments INA299 High-Precision Current Sense Amplifier
Texas Instruments INA299 High-Precision Current Sense Amplifier is a precise, bidirectional current sense amplifier that can measure voltage drops across shunt resistors over a wide common-mode range from –2V to 80V, independent of the supply voltage. The high-precision current measurement is achieved through a combination of low offset voltage (±150µV, maximum), small gain error (±0.25%, maximum), and a high DC CMRR (typical 120dB). The INA299 is designed for bidirectional DC current measurements and high-speed applications (such as fast overcurrent protection and transient detection) with a high signal bandwidth of 650kHz and a fast settling time.
The Texas Instruments INA299 operates from a single 2.7V to 12V supply, drawing 650µA of supply current. The INA299 has three gain options: 20V/V, 50V/V, 100V/V. Multiple gain options allow for optimization between wide output dynamic range requirements and available shunt resistor values. The INA299 is specified over an operating temperature range of -40°C to +125°C and is offered in a 6-pin SOT-23 package.
Features
- Wide common-mode voltage
- Operational voltage of -2V to +80V
- Survival voltage of -12V to +85V
- Bidirectional operation
- High small signal bandwidth of 650kHz (20V/V Gain)
- 2.5V/µs slew rate
- 6.5µs step response settling time to 1%
- 120dB high CMRR
- Gain error (max.) of ±0.25%, ±10ppm/°C drift
- Offset voltage (max.) of ±150µV, ±0.5µV/°C drift
- Operates from 2.7V to 12V supply
- Operational current of 650µA
- Available gains
- INA299A1: 20V/V
- INA299A2: 50V/V
- INA299A3: 100V/V
- SOT23-6 (DBV) package option
Applications
- DC-DC converter
- ESS battery management systems (BMS)
- Macro remote radio unit (RRU)
- 48V rack server
- 48V merchant network and server power supply (PSU)
Functional Block Diagram
Development Tool
Texas Instruments INA187EVM & INA299EVM Evaluation Modules
Provides three small, completely independent boards that can be separated by the user.
Related Current Sense Amplifiers
Texas Instruments INA299-Q1 Current Sense Amplifiers
Features AEC-Q100, -2V to 80V, bi-directional, 650kHz, high-precision current sense amplifiers.
Published: 2025-08-12
| Updated: 2025-11-05