AL8862Q CONVERTER Datasheet

AL8862Q Datasheet, PDF, Equivalent


Part Number

AL8862Q

Description

AUTOMOTIVE GRADE 55V 1A STEP-DOWN CONVERTER

Manufacture

Diodes

Total Page 16 Pages
Datasheet
Download AL8862Q Datasheet


AL8862Q
AL8862Q
AUTOMOTIVE GRADE 55V 1A STEP-DOWN CONVERTER
Description
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.
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/
Pin Assignments
(Top View)
SET 1
GND 2
FAULT 3
VIN 4
EP
SO-8EP
Applications
Automotive Interior LED Lamps
Automotive Exterior LED Lamps
8 CTRL
7 GND
6 SW
5 SW
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.
AL8862Q
Document number: DS42199 Rev. 3 - 2
1 of 16
www.diodes.com
December 2019
© Diodes Incorporated

AL8862Q
Typical Applications Circuit
VIN: 5 to 55V
AL8862Q
RSET
VIN SET
C1 CTRL
AL8862Q
FAULT
D1
GND SW
L1
Pin Descriptions
Pin Number
1
2,7
3
4
5,6
8
EP
Pin Name
SET
GND
FAULT
VIN
SW
CTRL
EP
Function
Set Nominal Output Current Pin. Connect resistor RSET from this pin to VIN to define nominal average
output current.
Ground of IC
FAULT Indication. Asserted Low to report faulty conditions. Needs an external pull-up resistor.
Input voltage (5V to 55V). Decouple to ground with 10μF or higher X7R ceramic capacitor close to
device.
Switch Pin. Connect inductor/freewheeling diode here, minimizing track length at this pin to reduce EMI.
Multi-function On/Off and brightness control pin:
Leave floating for normal operation.
Drive to voltage below 0.3V to turn off output current
Drive with DC voltage (0.4V < VSET < 2.5V) to adjust output current from 10% to 100% of IOUT_NOM
Drive with an analog voltage >2.6V output current will be 100% of IOUT_NOM
A PWM signal (Low level <0.3V, High level >2.6V, transition times less than 1s) allows the
output current to be adjusted over a wide range up to 100%
Connect a capacitor from this pin to ground to increase soft-start time.
(Default soft-start time = 0.1ms. Additional soft-start time is approximately 1.5ms/1nF)
Exposed pad/TAB connects to GND and thermal mass for enhanced thermal impedance.
Functional Block Diagram
4
VIN
VDD Generator
SET
1
Current
Monitor
SW
ILIMITER
BG &
Reference
Comp
Ref Hysteresis
Control
PWM
Logic
8
CTRL
PWM/DC
Dimming
OTP
OTP
PWM
2
GND
FAULT
3 OTP
SW
5, 6
Fault
Logic
Open
OCP
Driver
7
GND
AL8862Q
Document number: DS42199 Rev. 3 - 2
2 of 16
www.diodes.com
December 2019
© Diodes Incorporated


Features AL8862Q AUTOMOTIVE GRADE 55V 1A STEP-DOW N CONVERTER Description The AL8862Q is a step-down DC/DC converter designed t o drive LEDs with a constant current. T he AL8862Q operates with an input suppl y voltage from 5V to 55V and provides a n externally adjustable output current up to 1A. Series connection of the LEDs provides identical LED currents result ing in uniform brightness and eliminati ng the need for ballast resistors. The AL8862Q switches at frequency up to 1MH z. This allows the use of smaller size external components, hence minimizing t he PCB size. The AL8862Q integrates the power switch and a high-side output cu rrent sensing circuit. Maximum output c urrent of AL8862Q is set via an externa l resistor connected between the VIN an d SET input pins. Dimming is achieved b y applying either a DC voltage or a PWM signal at the CTRL input pin. The soft -start time can be adjusted using an ex ternal capacitor from the CTRL pin to t he ground. An input voltage of 0.3V or lower at CTRL pin will s.
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