INA296x –5V to 110V, Bidirectional, 1.1MHz, 8V/μs, Ultra-Precise Current Sense Amplifier

1 Features

Wide common-mode voltage:
- Operational voltage: −5V to 110V
- Survival voltage: −20V to 120V
Bidirectional operation
High small signal bandwidth: 1.1MHz (at all gains)
Slew rate: 8V/µs
Step response settling time to 1%: 1µs
Excellent CMRR: 166dB
Accuracy:
- Gain error (maximum)
  - Version A: ±0.01%, ±1ppm/°C drift
  - Version B: ±0.1%, ±5ppm/°C drift
- Offset voltage (maximum)
  - Version A: ±10µV, ±0.1µV/°C drift
  - Version B: ±150µV, ±0.5µV/°C drift
Available gains:
- INA296A1, INA296B1 : 10V/V
- INA296A2, INA296B2 : 20V/V
- INA296A3, INA296B3 : 50V/V
- INA296A4, INA296B4 : 100V/V
- INA296A5, INA296B5 : 200V/V
Package options: SOT23-8, VSSOP-8, SOIC-8,

2 Applications

3 Description

The INA296x is an ultra-precise, bidirectional current sense amplifier that can measure voltage drops across shunt resistors over a wide common-mode range from –5V to 110V, independent of the supply voltage. The high-precision current measurement is achieved through a combination of low offset voltage (±10µV, maximum), small gain error (±0.01%, maximum) and a high DC CMRR (typical 166dB). The INA296x is not only designed for high voltage, bidirectional DC current measurements, but also for high-speed applications (such as transient detection and fast overcurrent protection) with a high signal bandwidth of 1.1MHz and fast settling time.

The INA296x operates from a single 2.7V to 20V supply, drawing 2.5mA of supply current. The INA296x is available in five gain options: 10V/V, 20V/V, 50V/V, 100V/V, and 200V/V. Multiple gain options allow for optimization between available shunt resistor values and wide output dynamic range requirements.

The INA296x is specified over operating temperature range of −40°C to 125°C.

Package Information

PART NUMBER	PACKAGE⁽¹⁾	PACKAGE SIZE⁽²⁾
INA296A INA296B	DDF (SOT-23, 8)	2.9mm × 2.8mm
	DGK (VSSOP, 8)	3mm × 4.9mm
	D (SOIC, 8)	4.9mm × 6mm

(1) For all available packages, see the package option addendum at the end of the data sheet.

(2) The package size (length × width) is a nominal value and includes pins, where applicable.

Typical Application - DC/DC Converter

4 Device Comparison

Table 4-1 Device Comparison

DEVICE NAME	GAIN
INA296A1, INA296B1	10V/V
INA296A2, INA296B2	20V/V
INA296A3, INA296B3	50V/V
INA296A4, INA296B4	100V/V
INA296A5, INA296B5	200V/V

5 Pin Configuration and Functions

Figure 5-1 INA296x: DDF Package8-Pin SOT-23Top View

Figure 5-2 INA296x: D and DGK Package8-Pin SOIC and 8-Pin VSSOPTop View

Table 5-1 Pin Functions: D, DDF and DGK Packages

PIN		TYPE	DESCRIPTION
NAME	NO.	TYPE	DESCRIPTION
GND	2	Ground	Ground.
IN+	8	Input	Current-sense amplifier positive input. For high-side applications, connect to bus-voltage side of sense resistor. For low-side applications, connect to load side of sense resistor.
IN–	1	Input	Current-sense amplifier negative input. For high-side applications, connect to load side of sense resistor. For low-side applications, connect to ground side of sense resistor.
NC	4	Ground	Reserved. Connect to ground.
OUT	5	Output	Output voltage.
REF1	7	Input	Reference 1 voltage. Connect to voltage potential from 0V to V_S; see Adjusting the Output With the Reference Pins for connection options.
REF2	3	Input	Reference 2 voltage. Connect to voltage potential from 0V to V_S; see Adjusting the Output With the Reference Pins for connection options.
V_S	6	Power	Power supply, 2.7V to 20V