AL5871Q
AUTOMOTIVE GRADE, 55V LINEAR LED DRIVER
Description
Pin Assignments
The DIODES™ AL5871Q is an automotive-grade single channel linear
LED driver with PWM and analog dimming control. The AL5871Q can
drive up to 750mA and the LED current can be set by the low power
reference resistor connected to the REF pin.
Top View
VIN
1
2
3
4
5
6
7
8
16
FAULTB
ADIM
REF
DEN
NC
NC
PWM
NC
15
14
The AL5871Q regulates LED current accurate to ±4%, with excellent
PWM and analog dimming performance. The AL5871Q enters standby
mode to save power if no PWM signal is detected.
13
12
EP
NC
The AL5871Q monitors the temperature and reduces the LED current
if the chip temperature exceeds the threshold temperature. And the
input under voltage lock-out (UVLO), LED string open / short protection,
and over temperature protection (OTP) are designed for automotive
applications to improve system robustness. The FAULTB pin is pulled
low if any protection is triggered.
LED
NC
GND
NC
11
10
NC
9
NC
TSSOP-16EP (Type DX)
The AL5871Q is a simple solution to deliver constant current for a
single LED string with one fail all fail function, and can work with
DIODES™ AL5873Q to address different requirements. The AL5871Q
is available in TSSOP-16EP (Type DX) package.
Applications
Automotive interior lighting: dome light, reading lamps
Automotive exterior lighting:
.
Small light: blind-spot detection indicators, charging inlets,
Features
door handles
.
Rear light: rear lamps, center high mounted stop lamps, side
markers
Wide Input Voltage Range from 5V to 55V
Up to 750mA Output Current Capacity
Low Drop-out Voltage on LED Pin
Output Current Adjustable by a Low Power External Reference
Resistor
PWM and Analog Dimming with Excellent Linearity
Automatically Enter and Exit Standby Mode Without Enable Pin
Internal Protections:
Input Under Voltage Lock-out (UVLO)
Enable LED String Open Protection
LED String Short Protection
Over Temperature Protection (OTP)
Diagnostic Enable with Adjustable Threshold for Low-Dropout
Operation
Thermal Fold-Back if Chip Temperature Exceeds the Threshold
Fault Reporting: UVLO, OTP, LED Open, and LED Short
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
The AL5871Q is suitable for automotive applications
requiring specific change control; this part is AEC-Q100
qualified, PPAP capable, and manufactured in IATF16949
certified facilities.
https://www.diodes.com/quality/product-definitions/
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant.
2. See https://www.diodes.com/quality/lead-free/ for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and
Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
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November 2022
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AL5871Q
Document number: DS45259 Rev. 1 - 2