Texas Instruments has expanded its portfolio of current-shunt monitors with four new devices. The ICs monitor power-supply current, voltage, and power values with features that reduce board space and BOM while delivering high accuracy. The INA3221, INA282, INA223, and LMP8480 current shunt monitors are optimized for a wide range of end-equipment including smartphones; tablets; computers and servers; power-management devices; battery chargers; and industrial, telecommunications, and test equipment.
Key features and benefits:
INA3221: Triple-channel shunt and bus-voltage monitor with I2C interface
- Triple-channel device with digital interface enables monitoring of three separate voltages, eliminating the need for discrete devices for each voltage rail.
- 80-?V maximum offset voltage and 0.5% gain error enable highly accurate current measurement and precision over-current detection for end equipment.
: Wide common-mode range, bidirectional, high-accuracy current shunt monitor
- 70-?V maximum offset voltage and low gain error enable the use of smaller shunt resistors to reduce power consumption, board space, and BOM.
- Combines wide common-mode range (-14 to +80 V) and high common-mode rejection ratio (120 dB) with low offset voltage across multiple gain options. This feature combination increases accuracy in high-voltage applications, such as industrial system power units and telecom power systems.
: Analog-output current shunt, voltage monitor, and instantaneous power monitor
- Analog multiple-output current shunt device offers multiplexed current, voltage, and instantaneous power values to reduce board space and BOM.
- Programmable gain of 20, 128 and 300 allows operation over a wide dynamic current load without switching the sensing element, improving response time and accuracy in high-precision applications.
: Precision high-side current sense amplifier with voltage output
Tools and support
- High common-mode voltage range of 4 to 76 V and a high supply range of 4.5 to 76 V reduce system cost by allowing the device operate from the voltage node it is monitoring.
- Input offset voltage of 265 ?V, 50% lower than competing devices, increases sensing accuracy in high-precision applications.
Evaluation modules (EVMs) and IBIS and SPICE models are available today to quickly evaluate these devices:
INA3221 EVM: $75
INA282 EVM: $49
INA223 EVM: $75
LMP8480 EVM: $49
Package, availability, and pricing
The new current shunt monitors are available to sample and purchase today. Packaging and suggested retail pricing in 1,000-unit quantities are as follows:
INA3221: 4 x 4-mm, 16-pin QFN: US$1.85
INA282: 4.9 x 6-mm, 8-pin SOIC: US$1.25
INA223: 2.5 x 2.5-mm, 10-pin SON: US$1.15
LMP8040: 4.9 x 3.0-mm, 8-pin MSOP: US$1.10