Updated format to match new TI layout and flow. Tables, figures and cross-references use a new numbering sequence throughout the document.
Wide Common-Mode Range: –0.3 V to 26 VThe INA21x are voltage-output, current-shunt monitors (also called current-sense amplifiers) that are commonly used for overcurrent protection, precision-current measurement for system optimization, or in closed-loop feedback circuits. This series of devices can sense drops across shunts at common-mode voltages from –0.3 V to 26 V, independent of the supply voltage. Six fixed gains are available: 50 V/V, 75 V/V, 100 V/V, 200 V/V, 500 V/V, or 1000 V/V. The low offset of the zero-drift architecture enables current sensing with maximum drops across the shunt as low as 10-mV full-scale.
These devices operate from a single 2.7-V to 26-V
power supply, drawing a maximum of 100 µA of
supply current. All versions are specified over
the extended operating temperature range
(–40°C to +125°C), and
offered in SC70 and UQFN packages.
PART NUMBER | PACKAGE(1) | BODY SIZE (NOM) |
---|---|---|
INA21x | SC70 (6) | 2.00 mm × 1.25 mm |
UQFN (10) | 1.80 mm × 1.40 mm |
PIN | I/O | DESCRIPTION | ||
---|---|---|---|---|
NAME | DCK | RSW | ||
GND | 2 | 9 | Analog | Ground |
IN– | 5 | 4, 5 | Analog input | Connect to load side of shunt resistor |
IN+ | 4 | 2, 3 | Analog input | Connect to supply side of shunt resistor |
NC | — | 1, 7 | — | Not internally connected. Leave floating or connect to ground. |
OUT | 6 | 10 | Analog output | Output voltage |
REF | 1 | 8 | Analog input | Reference voltage, 0 V to V+ |
V+ | 3 | 6 | Analog | Power supply, 2.7 V to 26 V |
MIN | MAX | UNIT | ||
---|---|---|---|---|
Supply voltage, VS | 26 | V | ||
Analog inputs, VIN+, VIN–(2) | Differential (VIN+) – (VIN–) | –26 | 26 | V |
Common-mode (Version A)(3) | GND – 0.3 | 26 | V | |
Common-mode (Version B)(3) | GND – 0.1 | 26 | V | |
Common-mode (Version C)(3) | GND – 0.1 | 26 | V | |
REF input | GND – 0.3 | (VS) + 0.3 | V | |
Output(3) | GND – 0.3 | (VS) + 0.3 | V | |
Input current into any terminal(3) | 5 | mA | ||
Operating temperature | –55 | 150 | °C | |
Junction temperature | 150 | °C | ||
Storage temperature, Tstg | –65 | 150 | °C |
VALUE | UNIT | |||
---|---|---|---|---|
INA21x, (VERSION A) | ||||
V(ESD) | Electrostatic discharge | Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) | ±2000 | V |
Charged-device model (CDM), per JEDEC specification JESD22-C101(2) | ±1000 | |||
INA21x, (VERSIONS B AND C) | ||||
V(ESD) | Electrostatic discharge | Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) | ±3500 | V |
Charged-device model (CDM), per JEDEC specification JESD22-C101(2) | ±1000 |