Melexis MLX91219 High-Speed Hall Current Sensors

Melexis MLX91219 High-Speed Hall Current Sensors are high-accuracy, monolithic Hall-effect sensors that are sensitive to the flux density applied orthogonally to the IC surface. These sensors provide an analog output voltage proportional to the applied magnetic flux density. The MLX91219 components simplify module designs with a dual Over Current Detection (OCD) functionality, a flexible 3.3V/5V supply, and an improved SNR. With the hall technology, using a ferromagnetic core, currents can be measured in the ranges of 200A to beyond 2000A. The transfer characteristics of the MLX91219 are factory trimmed over-temperature and are programmable (offset, sensitivity, filtering, internal overcurrent threshold) during end-of-line customer calibration beyond the default factory trimming by Melexis. With the 400kHz bandwidth and fast response time, it is particularly well suited for high-speed applications such as inverters and converters characterized by their fast switching.

The MLX91219 Hall Current Sensors are packaged in two variants: VA and SOIC-8. The VA package is a thin through-hole package well suited for placement inside core airgaps, with several trim and form options available. In addition to the classic VDD/OUT/GND pins, an OCD pin is offered which internalizes the sensor output’s window comparator often required on automotive boards aiming to protect the power electronics from short circuits or overcurrents in general. The SOIC-8 package offers the same electrical performance, with the difference of being a fully-surface-mountable solution amended with additional package pins such as a VREF pin which enables either a non-ratiometric output mode or serves as an input pin defining the 0A level around which the sensor will build the output signal.

Features

Dual overcurrent detection, internal and external (SOIC-8 package) thresholds
Flexible supply voltage, 3.3V and 5V modes (factory selectable)
Selectable analog output, ratiometric or fixed (Vref, SOIC-8 package)
High-speed
- DC to 300kHz bandwidth
- 2µs response time
Measurement range
- From ±12mT to ±500mT
- 30A to beyond 5000A

Low noise
End-of-line programmable sensor
High linearity down to ±0.2% full scale
Very low thermal drift in a wide temperature range
- <5mV offset drift
- <1% sensitivity drift
Package options
- SOIC-8 (DC) package, MSL 3
- SIP-4 (VA) package, MSL 1
AEC-Q100 Grade 0 automotive qualified
RoHS compliant

Applications

High Voltage Traction inverters (HV)
- Phase current measurement
- DC link current measurement
48V Boost-recuperation machines
- Phase current measurement
- DC link current measurement

DC-DC converters
Redundant monitoring of battery-management system (BMS)
Smart battery junction boxes
Smart fuse overcurrent detection
Current sensor modules

Specifications

Positive supply voltage
- +8V maximum overvoltage
- +6.5V maximum maintaining application mode
Reverse voltage
- -0.3V maximum supply
- -0.3V maximum pin
Output current
- +25mA maximum sourcing
- 50mA maximum sinking
- 100mA maximum short circuit
- 20µA maximum leakage

5Ω maximum output resistance
0 to 6nF output capacitive load
17mA to 19mA maximum supply current range
Timing
- 2.1µs step response time
- 100kHz to 400kHz typical bandwidth
- 1ms power-on delay
Temperatures
- +165°C maximum junction
- -40°C to +150°C ambient operating
- -55°C to +165°C storage