A8513 Datasheet, PDF (1/24 Pages) Allegro MicroSystems – Wide Input Voltage Range, High Efficiency Fault Tolerant LED Driver

A8513
Wide Input Voltage Range, High Efficiency
Fault Tolerant LED Driver
Features and Benefits
• AEC-Q100 Qualified
• Wide input voltage range of 4.5 to 40 V for start/stop,
cold crank and load dump requirements
• Boost converter switching frequency up to 2 MHz,
allowing operation above the AM band
• Excellent input voltage transient response
• Internal secondary OVP for redundant protection
• Fully integrated LED current sink and boost converter with
60 V DMOS FET
• Maximum LED current of 150 mA
• Drives up to 14 series LEDs
• Single EN/PWM pin interface for PWM Dimming and
Enable function
• 5000:1 PWM dimming at 200 Hz
Continued on the next page…
Packages:
Not to scale
16-pin TSSOP
with exposed thermal pad
(LP package)
10-pin MSOP
with exposed thermal pad
(LY package)
Description
The A8513 is a single-output white LED (WLED) driver for
LCD backlighting. It integrates a current-mode boost converter
with an internal power switch and one current sink. The A8513
can operate from a single power supply from 4.5 to 40 V,
to accommodate start/stop, cold crank, and load dump
requirements. A 2 MHz boost converter switching frequency
allows the A8513 to operate above the AM radio band.
If required, the fault flag can be used as part of a circuit to drive
an external P-FET to disconnect the input supply from the system
in the event of a fault. The A8513 provides protection against
output short and overvoltage, open or shorted diode, open or
shorted LED pin, shorted boost switch or inductor, shorted
I_SET resistor, and IC overtemperature. A dual level cycle-by-
cycle current limit function provides soft start and protects the
internal current switch against high current overloads.
The A8513 is provided in a 10-pin MSOP package (suffix LY)
and a 16-pin TSSOP package (suffix LP). Both packages have
an exposed thermal pad for enhanced thermal dissipation, and
are lead (Pb) free, with 100% matte tin leadframe plating.
Applications:
• LCD backlighting for:
▫ Automotive infotainment
▫ Automotive cluster
▫ Automotive center stack
▫ Industrial LCD displays
▫ Portable DVD players
▫ Flatbed Scanners
▫ LED Lighting
V_IN
C_IN
V_C
C_VDD
R_ISET
Typical Application Circuit
L1
D1
VOUT
SW
VIN
A8513 _OVP
VDD
PAD
FAULT
R_OVP1
R_OVP2
EN/PWM
ISET
LED
COMP
GND
C_P
C_OUT
R_Z (Optional)
C_Z (Optional)
Boost f_SW
(MHz)
0.25/0.5/1
2
2
2
2
V_IN (min)
(V)
5
10
8
6
5
LEDs per
String (max)
14
14
12
9
7
A8513-DS Rev. 2