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Allegro MicroSystems

A8501 Datasheet Preview

A8501 Datasheet

4 Channel x 100 mA WLED/RGB Driver

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A8501
2 MHz, 4 Channel×100 mA WLED/RGB Driver
with Output Disconnect
Features and Benefits
600 kHz to 2.2 MHz switching frequency—ability to
operate above the AM band
Internal bias supply for single-supply operation (VIN = 6.8 to 21 V)
Boost converter with integrated 40 V DMOS switch and
OVP–load-dump protection
3.5 μA shutdown current—limits battery drain
Active current sharing between LED strings for
0.8% current matching and 0.7% accuracy
Drive up to 9 series LEDs in 4 parallel strings, 36 LEDs
maximum (Vf = 3.5 V, If = 100 mA)
LED sinks rated for 100 mA each (400 mA total)
PWM dimming with LED PWM duty cycle control
4000:1 dimming range
Extensive fault mode protection schemes:
Shorted LED protection against misconnected loads—
with true output disconnect
Open LED disconnect protects against LED failures
External thermistor sensing to limit LED temperature
Output overvoltage protection (OVP): 19.5 V default can
be adjusted as high as 38 V
Open Schottky and open OVP resistor protection against
external component failure
Input under- and overvoltage protection (UVLO and
OVLO) against VIN variation
Boost current limit, output short circuit limit,
overtemperature protection (OTP), and soft start
Package:
Not to scale
28-pin TSSOP with
exposed thermal pad
(package LP)
Description
TheA8501 is a multioutputWLED/RGB driver for backlighting
medium-size displays. The A8501 integrates a boost converter
and four 100 mA current sinks. LED channels can be tied
together for up to 400 mA sink capability. It can work from a
single power supply of 6.8 to 21 V and withstand up to 40 V.
The boost converter is a constant frequency, current-mode
converter.
Operating frequency can be set to 2 MHz in order to avoid
interference with the AM radio band. The integrated boost
DMOS switch is rated for 40 V at 3.6A. PWM dimming allows
LED currents to be controlled at up to a 1000:1 ratio.Additional
4:1 dimming can be achieved by using the DIM pin.
TheA8501 provides protection against output connector shorts
through an integrated output disconnect switch. An optional
external thermistor can be used to limit LED current based on
panel temperature.
The device is supplied in a surface mount, 28-pin TSSOP
package (suffix LP), with exposed thermal pad for enhanced
thermal dissipation. It is lead (Pb) free, with a leadframe
plating choice of 100% matte-tin (suffix T) or tin-bismuth
(suffix B).
Applications include:
GPS navigation systems
Automotive infotainment
Back-up camera displays
Cluster backlighting
Portable DVD players
Industrial LCD displays
Typical Application
Figure 1. LCD monitor backlight driving
4 LED strings. On/off and dimming
control using ENABLE pin.
• Current = 50 mA per string
• OVP = 35 V nominal
• Switching frequency = 2 MHz
8501-DS, Rev.4
A8501
RVC
NTC
VTO
VTI
–t°
Optional Configuration
for Thermal Derating
VBAT
CBAT
4.7 μF
35 V
CCOMP
1 μF
10 V
CBIAS
0.1 μF
10 V
RISET
24.3 kΩ
D1
CIN
L1
10 μH
ROVP
78.7 kΩ
COUT
4.7 μF
50 V
VIN SW SW SW OVP CAP
EN OUT
COMP
DIM
RFSET
25.5 kΩ
FSET
A8501
BIAS
SEL2
PAD
NC
SEL1
VTO
LED1
LED2
VTI LED3
ISET
LED4
AGND PGND PGND PGND LGND DGND




Allegro MicroSystems

A8501 Datasheet Preview

A8501 Datasheet

4 Channel x 100 mA WLED/RGB Driver

No Preview Available !

A8501
2 MHz, 4 Channel×100 mA WLED/RGB Driver
with Output Disconnect
Selection Guide
Part Number
Operating
Temperature, TA
A8501ELPTR-T –40°C to 85°C
A8501GLPTR-T –40°C to 105°C
A8501KLPTR-B –40°C to 125°C
A8501KLPTR-T –40°C to 125°C
Packing
4000 pieces per 13-in. reel
4000 pieces per 13-in. reel
4000 pieces per 13-in. reel
4000 pieces per 13-in. reel
Package
28-pin TSSOP with exposed thermal pad
28-pin TSSOP with exposed thermal pad
28-pin TSSOP with exposed thermal pad
28-pin TSSOP with exposed thermal pad
Leadframe Plating
100% matte tin
100% matte tin
Tin-Bismuth
100% matte tin
Absolute Maximum Ratings*
Characteristic
SW, OVP, CAP, OUT Pins
Symbol
Notes
Rating
–0.3 to 40
Units
V
LED1 through LED4 Pins
–0.3 to 21
V
VIN Pin
Steady state
VIN Transient < 1 s
–0.3 to 34
40
V
V
DIM Pin
Remaining Pins
VDIM
–0.3 to 6
–0.3 to 7
V
V
Range E
–40 to 85
ºC
Operating Ambient Temperature
TA Range G
Range K
–40 to 105
–40 to 125
ºC
ºC
Maximum Junction Temperature
TJ(max)
150 ºC
Storage Temperature
Tstg
–55 to 150
ºC
*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.
Thermal Characteristics
Characteristic
Package Thermal Resistance
Symbol
RθJA
Test Conditions*
4-layer PCB based on JEDEC standard
*Additional thermal information available on Allegro website.
Value
28
Units
ºC/W
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2


Part Number A8501
Description 4 Channel x 100 mA WLED/RGB Driver
Maker Allegro MicroSystems
Total Page 24 Pages
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