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ALT80600 Datasheet Preview

ALT80600 Datasheet

LED Driver

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ALT80600
LED Driver with Pre-Emptive Boost
for Ultra-High Dimming Ratio and Low Output Ripple
FEATURES AND BENEFITS
• Automotive AEC-Q100 qualified
• Wide input voltage range of 4.5 to 40 V for start/stop,
cold crank, and load dump requirements
• Fully integrated LED current sinks and boost converter
with internal power MOSFET
• Operate in Boost or SEPIC mode for flexible output
• Drives up to 11 series white LED in 4 parallel strings, at
up to 120 mA per string (VF = 3.3 V max).
• Programmable boost switching frequency or sync
externally from 200 kHz to 2.3 MHz
• Clock-Out feature for internal switching frequency
• Adjustable 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
Continued on next page...
DESCRIPTION
The ALT80600 is a multi-output LED driver for small-size
LCD backlighting. It integrates a current-mode boost converter
with internal power switch and four current sinks. The boost
converter can drive up to 44 white LEDs, 11 LED per string,
at 120 mA (VF = 3.3 V max). LED sinks can be paralleled
together to achieve higher currents up to 480 mA.
The ALT80600 operates from single power supply from 4.5 to
40 V; once started, it can continue to operate down to 3.9 V.
This allows the part to withstand stop/start, cold crank, and
load dump conditions encountered in automotive systems.
The ALT80600 can control LED brightness through external
PWM signal. By using the patented ‘Pre-emptive Boost’
control, an LED brightness contrast ratio of 15,000:1 can be
achieved using PWM dimming at 200 Hz. A higher ratio of
150,000:1 is possible when using a combination of PWM and
analog dimming.
Continued on next page...
PACKAGE:
Not to scale
24-Pin 4 mm × 4 mm QFN
with Wettable Flank
APPLICATIONS
• Automotive infotainment backlighting
• Automotive cluster
• Automotive center stack
• Automotive exterior lighting
VIN = 4.5 to 40 V
Cin
*optional
0.024 Ω
383 Ω
Q1
10 µH
187 kΩ
VOUT ≤ 40 V
Vc
10 kΩ
Enable
PWM tON ≥ 0.3 µs
APWM 100 kHz 0-90%
GATE
Vsense
Vin
1 µF VDD
SW
FAULT
EN
ALT80600
PWM
APWM
CLKOUT
AGND ISET
FSET
DITH
8.25 kΩ
10 kΩ
40.2 kΩ
10 nF
OVP
PGND
4.7 µF
4.7 µF
LED1
LED2
LED3
Up to 11 WLEDs in series
Up to 120 mA/channel
LED4
COMP
PEB
100 pF
9.09 kΩ
845 Ω
68 nF
Figure 1: Typical application diagram showing ALT80600 in Boost mode
ALT80600-DS, Rev. 2
MCO-0000393
March 13, 2019




Allegro

ALT80600 Datasheet Preview

ALT80600 Datasheet

LED Driver

No Preview Available !

ALT80600
LED Driver with Pre-Emptive Boost
for Ultra-High Dimming Ratio and Low Output Ripple
FEATURES AND BENEFITS (continued)
DESCRIPTION (continued)
• Excellent input voltage transient response even at lowest
PWM duty cycle
• Gate driver for optional PMOS input disconnect switch
• Extensive protection against:
□Shorted boost switch, inductor or output capacitor
□Shorted FSET or ISET resistor
□Open or shorted LED pins and LED strings
□Open boost Schottky diode
□Overtemperature
Switching frequency can be either above or below AM band.
A programmable dithering feature further reduces EMI. A
synchronization pin allows switching frequency to be synchronized
externally between 200 kHz and 2.3 MHz. A‘Clock-Out’pin allows
other converters to be synchronized to the ALT80600’s switching
frequency.
TheALT80600 provides protection against output short, overvoltage,
open or shorted diode, open or shorted LED pin, and overtemperature.
Acycle-by-cycle current limit protects the internal boost switch against
high current overloads. An external P-MOSFET can optionally be
used to disconnect input supply in case of output to ground short fault.
SELECTION GUIDE [1]
Part Number
Package
Packing
Leadframe Plating
ALT80600KESJSR
24-pin 4 × 4 mm wettable flank QFN
with exposed thermal pad and sidewall plating
6000 pieces per reel
100% matte tin
[1] Contact Allegro for additional packing options.
ABSOLUTE MAXIMUM RATINGS [2]
Characteristi
Symbol
LEDx Pin
OVP pin
VIN
VLEDx
VOVP
VIN
VSENSE, GATE
VSENSE,
VGATE
SW
FAULT
APWM, EN, PWM, CLKOUT, COMP,
DITH, FSET, ISET, VDD, PEB
Operating Ambient Temperature
Maximum Junction Temperature
Storage Temperature
VSW
VFAULT
TA
TJ(max)
Tstg
x = 1..4
Notes
Continuous
t < 50 ns (repetitious, <2.5 MHz)
Single-event in case of Fault [3]
Range K
Rating
–0.3 to 40
–0.3 to 40
–0.3 to 40
Higher of –0.3
and (VIN – 7.4) to
VIN +0.4
–0.6 to 50
–1.0 to 54
–1.5 to 60
–0.3 to 40
–0.3 to 5.5
–40 to 125
150
–55 to 150
Unit
V
V
V
V
V
V
V
V
V
°C
°C
°C
[2] Stresses beyond those listed in this table may cause permanent damage to the device. The absolute maximum ratings are stress ratings only,
and functional operation of the device at these or any other conditions beyond those indicated in the Electrical Characteristics table is not implied.
Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
[3] SW DMOS is self-protecting and will conduct when VSW exceeds 60 V.
THERMAL CHARACTERISTICS: May require derating at maximum conditions; see application information
Characteristic
Symbol
Test Conditions [4]
Value
Package Thermal Resistance
RθJA
ES package measured on 4-layer PCB based on JEDEC standard
37
Unit
°C/W
[4] Additional thermal information available on the Allegro website.
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
2


Part Number ALT80600
Description LED Driver
Maker Allegro
Total Page 30 Pages
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