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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
2

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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

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A1569E
LED Driver with Integrated Hall-Effect Switch
ELECTRICAL CHARACTERISTICS: Valid at TA = –40°C to 85°C, VIN = 7 to 24 V (unless otherwise specif ied)
Characteristic
Symbol
Test Conditions
Min.
Typ.1
Max.
Electrical Characteristics
VIN Functional Operating Range
VIN (VDD) Operating, TJ < 165°C
7 – 24
VIN Quiescent Current
IINQ LA connected to VIN, LED off
– 6 10
VIN Sleep Current
IINS SEN_EN and EXT = GND
– 10 25
Startup Time
SEN_EN = VIN, |B| < |BRPx| – 5 gauss,
tON RIREF = 600 Ω, CFADE = 100 pF,
–– 1
measured from VIN > 7 V to ILA source > 90% ILAmax
External Response Time
SEN_EN = GND, VIN > 7 V
tEXT RIREF = 600 Ω, CFADE = 100 pF, measured from
EXT > VIH(MIN) to ILA source > 5% ILAmax
––
1
Current Regulation
Reference Voltage
Reference Current Ratio
Current Accuracy2
Output Source Current
VIREF
267 µA < IREF < 2 mA
– 1.2
GH (ILA + 0.5) / IREF
– 75 –
EILA 20 mA > ILA > 150 mA
–5 ±4
5
SEN_EN = high, BFIELD < BRP
– GH × IREF
ILA
RIREF = 600 Ω, SEN_EN = high and BFIELD < BRP, or
EXT = high
150 170
Dropout Voltage
Current Slew Time
Logic Inputs
VDO
tFADE(MIN)
VIN – VLA , ILA = 150 mA
VIN – VLA , ILA = 50 mA
Current rising or falling between 10% and 90%,
CFADE = 100 pF
– – 2.4
– 800 –
– 80 –
Input Low Voltage
Input High Voltage
Pull-Down Resistor
Input Voltage Range
VIL
VIH
RPD
VLOGIC
SEN_EN, EXT
SEN_EN, EXT
SEN_EN, EXT
EXT, IREF, THTH, FADE
SEN_EN
––
2–
– 50
–0.3 –
–0.3 –
0.8
5.5
24
Units
V
mA
µA
ms
ms
V
%
mA
V
mV
µs
V
V
V
V
Continued on next page...
1 Typical data is at TA = 25ºC and VIN = 12 V and it is for design information only.
2 When SEN_EN or EXT = high, EILA = 100 × {[( | ILA | + 0.5 ) × RIREF / 90 ] – 1}, with ILA in mA and RIREF in kΩ.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
4

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A1569E
LED Driver with Integrated Hall-Effect Switch
ELECTRICAL CHARACTERISTICS (continued): Valid at TA = –40°C to 85°C, VIN = 7 to 24 V (unless otherwise
specif ied)
Characteristic
Symbol
Test Conditions
Min.
Typ.1
Max. Units
Protection
Short Detect Voltage
VSCD
Measured at LA
1.2 – 1.8 V
Short-Circuit Source Current
ISCS Short present LA to GND
– 1 – mA
Short Release Voltage Hysteresis
VSChys
VSCR – VSCD, measured with 0.1 µF cap between
ILA and GN
200
500 mV
Thermal Monitor Activation2
Thermal Monitor Slope2
Thermal Monitor Low Current
Temperature
TJM
dISEN/dTJ
TJL
TJ with ISEN = 90%, THTH open
ISEN = 50%, THTH open
TJ at ISEN = 25%, THTH open
110 130 145 ºC
–3.5 –2.5 –1.5 %/ºC
135 150 165 ºC
Overtemperature Shutdown
Overtemperature Hysteresis
Magnetic Characteristics3
TJF
TJhys
Temperature increasing
Recovery occurs at TJF – TJhys
– 170 – ºC
– 15 – ºC
Operate Point
Release Point
Hysteresis
BOPS
BOPN
BRPS
BRPN
BHYS
SEN_EN = high and BFIELD > BOP, LED is off
(EXT = low)
SEN_EN = high and BFIELD < BRP, LED is on
(EXT = low)
| BOPX – BRPX |
– 40
–70 –40
5 25
– –25
5 15
70 G
–G
–G
–5 G
25 G
LED On
LED Off
Decreasing
BFIELD
Magnitude
BHYS
Increasing
BFIELD
Magnitude
Figure 1: Hall Switch Control of LED State
1 Typical data is at TA = 25ºC and VIN = 12 V; for design information only.
2 Guaranteed by design.
3 Magnetic flux density, B, is indicated as a negative value for north-polarity magnetic fields, and is a positive value for south-polarity magnetic fields.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5