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A1569E
LED Driver with Integrated Hall-Effect Switch
FEATURES AND BENEFITS
Linear LED drive current ≤150 mA set by an external
reference resistor
• High sensitivity, omnipolar Hall-effect switch for LED
on/off control
• Low component count for small size and ease of design
• Elegant fade-in/fade-out effects with adjustable duration
(optional)
• Low dropout voltage and low supply current
• Chopper-stabilized Hall switch
□Low switchpoint drift over temperature
□Insensitivity to physical stress
• Input pin for external LED driver control
• Slew-rate-limited LED output drive for current transient
suppression
• Ruggedness and reliability
□Integrated voltage regulator for operation from 7 to 24 V
□Reverse-battery protection
□Automatic short-circuit and thermal overload
protection and recovery
□–40ºC to 85ºC ambient temperature range
• Small 8-pin SOIC package with thermal pad
PACKAGE:
8-Pin SOICN with Exposed Thermal Pad (Suffix LJ)
DESCRIPTION
The A1569E is a highly integrated solution that combines a
Hall-effect switch with a linear, programmable current regulator,
providing up to 150 mA to drive one or more LEDs. With the
addition of only two passive components and one or more
LEDs, the A1569E forms a complete, magnetically actuated
lighting solution that is small, flexible, elegant, easy to design,
rugged, and reliable. It is optimized for automotive interior and
auxilliary lighting such as map lights, glove boxes, consoles,
vanity mirrors, hood/truck/bed lights, etc.
The LED drive current is set by an external resistor; the LED is
then activated by the built-in Hall-effect switch and features an
adjustable fade-in/fade-out effect. Omnipolar operation (either
north or south pole) and high magnetic sensitivity make the
A1569E tolerant of large air gaps and mechanical misalignment.
System assembly is easier, as the magnet can be oriented with
either pole facing the device. Chopper stabilization provides
low switchpoint drift over the operating temperature range.
The driver can also be activated via an external input for direct
control of the LED.
In addition to contactless operation and safe, constant-current
LED drive, reliability is further enhanced with reverse-battery
protection, thermal foldback, and automatic shutdown for
thermal overload and shorts to ground.TheA1569E will prevent
damage to the system by removing LED drive current until
the short is removed and/or the chip temperature has reduced
below the thermal threshold. The driver output is slew-rate-
limited to reduce electrical noise during operation.
Not to scale
Continued on the next page…
For standalone operation,
SEN_EN is pulled high
(e.g., tied to VIN)
+V
CBYPASS
Optional
Control Signals
From MCU or
Remote Switch
SLEEP
LED_ON
VIN
SEN_EN
EXT HALL
LA
RIREF
IREF
No Connect
or THTH
Connect to GND
FADE
GND
150 mA
CFADE
(optional)
A1569E-DS
Typical Application Diagram

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A1569E
LED Driver with Integrated Hall-Effect Switch
Description (continued)
The device is packaged in an 8-pin SOICN (LJ) with an exposed
pad for enhanced thermal dissipation. It is RoHS compliant, with
100% matte-tin leadframe plating.
TheA1569E is intented for non-automotive applications that require
an operating temperature range of up to 85°C. For automotive
applications that require qualification perAEC-Q100 or applications
that require higher operating temperatures, refer to the A1569K.
Selection Guide*
Part Number
Packing
A1569ELJTR-T
3000 pieces per 13-in. reel
* For automotive applications, see A1569K datasheet.
Package
8-pin SOICN surface mount
Absolute Maximum Ratings
Characteristic
Forward Supply Voltage
Reverse Supply Voltage
Pin SEN_EN
Pin LA
Pin EXT
Pin IREF
Pin THTH
Pin FADE
Operating Ambient Temperature
Maximum Junction Temperature
Storage Temperature
SPECIFICATIONS
Symbol
VIN (VDD)
VRDD
VSEN_EN
VLA
VEXT
VIREF
VTHTH
VFADE
TA
TJ(MAX)
Tstg
Range E
Notes
Temperature Range, TA (ºC)
–40 to 85
RoHS
COMPLIANT
Rating
30
–18
–18 to 30
–0.3 to 30
–0.3 to 6.5
–0.3 to 6.5
–0.3 to 6.5
–0.3 to 6.5
–40 to 85
165
–65 to 170
Unit
V
V
V
V
V
V
V
V
ºC
ºC
ºC
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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A1569E
LED Driver with Integrated Hall-Effect Switch
Clock/Logic
Current Reference
Current
Regulator
Slew Thermal Temp
Limit Shutdown Monitor
Control Logic
LA
Regulator
Wake Up
GND
VIN
+
RPD
RPD
SEN_EN
EXT
IREF
RIREF
FADE
CFADE
(optional)
THTH
Functional Block Diagram
Pinout Drawing and Terminal List
VIN 1
SEN_EN 2
EXT 3
LA 4
PAD
8 GND
7 THTH
6 IREF
5 FADE
Package LJ, 8-Pin SOICN Pinout Drawing
Terminal List
Pin Number
1
2
3
4
5
6
7
8
Pin Name
VIN
SEN_EN
EXT
LA
FADE
IREF
THTH
GND
PAD
Description
Supply
Hall sensor enable
External override input
LED anode (+) connection
Fade-in/fade-out dimming
Current reference
Thermal threshold
Ground reference
Exposed thermal pad (may be left
floating or tied to ground)
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
3