AL8862Q
AUTOMOTIVE GRADE 55V 1A STEP-DOWN CONVERTER
Description
Pin Assignments
(Top View)
The AL8862Q is a step-down DC/DC converter designed to drive
LEDs with a constant current. The AL8862Q operates with an input
supply voltage from 5V to 55V and provides an externally adjustable
output current up to 1A. Series connection of the LEDs provides
identical LED currents resulting in uniform brightness and eliminating
the need for ballast resistors. The AL8862Q switches at frequency up
to 1MHz. This allows the use of smaller size external components,
hence minimizing the PCB size.
The AL8862Q integrates the power switch and a high-side output
current sensing circuit. Maximum output current of AL8862Q is set
via an external resistor connected between the VIN and SET input
pins. Dimming is achieved by applying either a DC voltage or a PWM
signal at the CTRL input pin. The soft-start time can be adjusted
using an external capacitor from the CTRL pin to the ground. An
input voltage of 0.3V or lower at CTRL pin will shut down the power
switch.
8
CTRL
7
GND
3
6
SW
4
5
SW
SET
1
GND
2
FAULT
VIN
EP
SO-8EP
Applications
Automotive Interior LED Lamps
Automotive Exterior LED Lamps
The AL8862Q is qualified to AEC-Q100 Grade 1 and is automotive
grade to support PPAPs.
Features
Wide Input Voltage Range: 5V to 55V
Output Current up to 1A
Internal 55V NDMOS Switch
Typical 4% Output Current Accuracy
Single Pin for On/Off and Brightness Control by DC Voltage or
PWM Signal
High Efficiency (Up to 97%)
Fault Status Indication for Abnormal Operation
LED Short-Circuit Protection
Inherent Open-Circuit LED Protection
Current-Sense Resistor Short-Circuit Protection
Over Temperature Shutdown
Up to 1MHz Switching Frequency
SO-8EP Packages Available in Green Molding Compound (No
Br, Sb)
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
The AL8862Q is suitable for automotive applications
requiring specific change control; this part is AEC-Q100
qualified, PPAP capable, and manufactured in IATF 16949
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
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