A80606 and A80606-1
High Power LED Driver with Pre-Emptive Boost
for Ultra-High Dimming Ratio and Low Output Ripple
FEATURES AND BENEFITS
DESCRIPTION
The A80606 is a multi-output LED driver for automotive
applicationssuchasexteriorlighting,heads-updisplay,andmid-
size LCD backlighting. It implements a current-mode boost/
SEPICconverterwithgatedriverforexternalN-MOSFET.This
allows greater output power even at minimum supply voltage.
• Automotive AEC-Q100 qualified
• Enhanced fault handling for ASIL B system compliance
• Wide input voltage range of 4.5 to 40 V for start/stop,
cold crank, and load dump requirements
• Operate in Boost or SEPIC mode for flexible output
• Gate driver for external NMOS to deliver higher output power
• Six integrated LED current sinks, up to 180 mA each
• Boost switching frequency synced externally or
programmed from 200 kHz to 2.3 MHz
• Programmable boost frequency dithering to reduce EMI
• Advanced control allows minimum PWM on-time down
to 0.3 µs, and avoids MLCC audible noises
• LED contrast ratio: 15,000:1 at 200 Hz using PWM
dimming alone, 150,000:1 when combining PWM and
analog dimming
The A80606 provides six integrated current sinks driving up
to 180 mAper string. Multiple sinks can be paralleled together
to achieve higher LED currents up to 1.08 A. The IC operates
from single power supply from 4.5 to 40 V; once started, it can
continue to operate down to 4 V. This allows it to withstand
stop/start, cold crank, and load dump conditions encountered
in automotive systems.
TheA80606cancontrolLEDbrightnessthroughexternalPWM
signal.ByusingthepatentedPre-EmptiveBoostcontrol,anLED
brightnesscontrastratioof15,000:1canbeachievedusingPWM
dimmingat200Hz.Ahigherratioof150,000:1ispossiblewhen
using a combination of PWM and analog dimming.
• Excellent input voltage transient response even at lowest
PWM duty cycle
• Gate driver for optional PMOS input disconnect switch
• Extensive fault protection features
Continued on next page...
PACKAGE:
APPLICATIONS
• Automotive infotainment backlighting
48-Pin 7 mm × 7 mm
QFN with Wettable Flank
• Automotive heads-up display
• Automotive interior and exterior lighting
Not to scale
VIN = 8-16 V
VOUT ≤ 40 V
optional input overcurrent disconnect
L1
RSENSE
RADJ
D1
CIN2
Q1
D2
Cin
ROVP
RCS
CDRV
RGDRV
COUT
CS
GATE
VDRV GDRV
PGND
OVP
Vsense
VIN
V
c
CVDD
VDD
RPU
LED1
FAULT
A80606
Up to 11 WLEDs in series
Up to 180 mA/channel
Combine to drive up to 1.08 A total
LED2
LED3
EN
Enable
PWM
ADIM
PWM tON ≥ 0.3 µs
LED6
CLKOUT
AGND
iLED
COMP
PEB
100%
FSET
ISET
DITH
RZ
ADIM
CP
RM
PEB = Pre-Emptive Boost
(RD controls the delay time)
DITH = Dithering Control
RISET
RFSET
RD
CM
CZ
APWM 100 kHz 0-90%
(Modulation frequency and range)
Figure 1: A80606 in typical Boost configuration where VOUT is higher than VIN
A80606-DS
August 27, 2020
MCO-0000926
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