APS13568 Datasheet, PDF (1/22 Pages) Allegro MicroSystems – Linear LED drive up to 150 mA

FEATURES AND BENEFITS
• Micropower (25 μA, typical) when LED is off
• Linear LED drive up to 150 mA
• Omnipolar Hall-effect switch
□□Low drift over temperature
□□Solid-state reliability
□□Insensitive to physical stress
• External LED-enable pin for direct on/off control
• Hall-effect switch output
□□Supports secondary switches and/or LED drivers
□□Provides switch state for other functions
□□Selectable output polarity
• Automotive-grade ruggedness and fault-tolerance
□□“K” temperature range qualified per AEC-Q100
□□Reverse-battery and load-dump protection
□□Short-circuit protection
□□Thermal protection
• Internal protection circuits enable 40 V load dump
compliance without external protection components
APPLICATIONS
• Automotive glove boxes and storage
• Automotive vanity mirrors
• Task lighting
• Consumer electronics
PACKAGE:
8-Pin SOICN
with Exposed Thermal Pad
(Suffix LJ)
Not to scale
APS13568
LED Driver with Integrated
Micropower Hall-Effect Switch
DESCRIPTION
The APS13568 is an integrated circuit that combines an
ultrasensitive, omnipolar, micropower Hall-effect switch
with a linear programmable current regulator providing up to
150 mA to drive high brightness LEDs. The omnipolar Hall-
effect switch provides contactless control of the regulated LED
current, which is set by a single reference resistor. This highly
integrated solution offers high reliability and ease of design
compared to a discrete solution.
The Hall-effect switch operates with either a north or a south
magnetic pole. The switch output polarity can be set with an
external pulldown on the POL input pin. This allows the user
to select whether the APS13568 switch output goes low when a
magnet is present or when the magnetic field is removed. Chopper
stabilization provides low switchpoint drift over temperature.
The LED is turned on when the EN input goes low. This active-
low input can be connected directly to the Hall switch output,
SO, to turn the LED on when the switch output goes low. This
flexible solution allows the user to connect additional slave
switches, LED drivers, PWM, or microprocessor inputs to
control when the LED is on. Optionally, an external capacitor
can be used to adjust the fade-in/fade-out feature.
On-board protection for shorts to ground and thermal overload
prevents damage to the APS13568 and LED string by limiting
the regulated current until the short is removed and/or the chip
temperature has reduced below the thermal threshold.
Continued on the next page…
APS13568-DS
C_{BYPASS +V}
0.1 µF
VIN
R_PU
4.7 kΩ
SO
LA
150 mA
EN HALL
POL
FADE
R_IREF
600 Ω
IREF
GND
C_FADE
(optional)
Figure 1: Typical Application Diagram
March 13, 2017