GENERAL DESCRIPTION
MA211K are integrated Hall sensors with output drivers, mainly designed for electronic
commutation of brush-less DC Fan. This IC is using HV BCD process internally includes the
regulator, protecting diode, Hall plate, amplifier, comparator, and a pair of complementary
open-Drain outputs (DO, DOB).
While the magnetic flux density (B) is larger than operate point (Bop), DO will turn on
(low), and meanwhile DOB will turn off (high). Each output is latched until B is lower than
release point (Brp), and then DO, DOB transfer each state.
To avoid coil burning, rotor-lock shutdown detection circuit shut down the output driver if
the rotor is blocked and then the automatic recovery circuit will try to restart the motor. This
function repeats while rotor is blocked. Until the blocking is removed, the motor recovers
running normally.

 FEATURES
- On-chip Hall effect sensor with two different sensitivity and hysteresis settings
- Wide operating voltage range: 4.0V~20V
- Output sink current up to 0.4A
- Built-in FG output
- Rotor-locked shutdown and automatically restart function
- Thermal Shutdown Protection
- -40°C to 85°C operating temperature
- Low Profile SIP-4L Package( Green and Lead Free )