A8517 Datasheet, PDF (1/66 Pages) Allegro MicroSystems – Extensive diagnostics and fault reporting

A8517
Wide Input Voltage, Fault Tolerant, Independently Controlled
Multi-Channel LED Driver with I²C interface
FEATURES AND BENEFITS
• AEC-Q100 qualified
• Wide input voltage range of 4.5 to 36 V
• Operates down to 3.9 V (V_IN falling) for idle stop, and up
to 40 V for load dump
• Integrated boost converter with DMOS switch and OVP
protection up to 39 V
• 10 fully integrated LED current sinks, with individually
programmable current up to 60 mA per channel
• I²C™ interface for programming LED current, PWM
dimming, and various protection thresholds per channel
• Ability to drive multiple loads from a single IC
• Extensive PWM dimming (up to 10,000:1 at 100 Hz),
individually programmable for each channel
• Extensive diagnostics and fault reporting
Continued on the next page…
PACKAGE:
28-pin TSSOP with exposed thermal pad
(suffix LP)
Not to scale
DESCRIPTION
The A8517 is a programmable multi-output LED driver, which
can be used for a variety of LED Driver applications. It integrates
a current-mode boost converter with internal power switch and
10 current sinks. The IC operates from 4.5 to 36 V, and is able
to withstand up to 40 V load-dump conditions encountered in
automotive systems.
The I²C interface allows the user to set the LED currents
individually, up to 60 mA per LED channel. Adjacent channels
may be combined to drive higher-current LED strings. The
PWM dimming duty cycle is independently controlled for
each LED channel, and each channel can be enabled/disabled
independently if needed.
This flexibility makes the A8517 a single solution for a wide
range of LED applications, in some cases offering the ability
to replace two or more LED driver ICs with a single device.
Continued on the next page…
APPLICATIONS:
Automotive:
• Infotainment
• Cluster
• Center-stack lighting
• Head-up display (HUD)
• Daytime running lights (DRL)
V_IN (4.5 to 36 V)
R_SENSE A
L1
D1
VOUT
CIN
I²C Interface
External
Synchronization
Q1 A
CQ1
GATE
INS
VIN
EN
SW
PGND
A8517 _OVP
CVDD
R_ADDR
V_{C B RFSET}
VDD
ADDR
PAD
LED1
LED2
SDA
SCL
FSET/SYNC
LED10
COMP
GND
FLAG GPO1 GPO2 AGND
COUT
R_Z
C_P
C_Z
Status /
Interrupt
A Optional
B External pull-up voltage, or
connected to VDD
A8517-DS, Rev. 9
Typical Application Drawing
February 10, 2017