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A8521 Datasheet(PDF) 2 Page - Allegro MicroSystems

Part # A8521
Description  The A8521 is a multi-output white LED driver for small-size LCD backlighting.
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Manufacturer  ALLEGRO [Allegro MicroSystems]
Direct Link  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

A8521 Datasheet(HTML) 2 Page - Allegro MicroSystems

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Wide Input Voltage Range, High Efficiency
Fault Tolerant LED Driver
A8521
2
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Absolute Maximum Ratings*
Characteristic
Symbol
Notes
Rating
Unit
LEDx Pins
–0.3 to 55
V
OVP Pin
–0.3 to 60
V
VIN, VSENSE, GATE Pins
VSENSE and GATE pins should not exceed VIN
by more than 0.4 V
–0.3 to 40
V
SW Pin
Continuous
–0.6 to 62
V
t < 50 ns
–1.0
V
¯F¯¯A¯¯¯U¯¯L¯¯T¯ Pin
-0.3 to 40
V
ISET, FSET, APWM, COMP Pins
–0.3 to 5.5
V
All Other Pins
–0.3 to 7
V
Operating Ambient Temperature
TA
Range K
–40 to 125
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.
Selection Guide
Part Number
Packing*
A8521KLPTR-T
4000 pieces per 13-in. reel
*Contact Allegro® for additional packing options
Table of Contents
Specifications
2
Pin-out Diagram and Terminal List
3
Characteristic Performance
8
Functional Description
11
Enabling the IC
11
Powering up: LED pin short-to-ground check
11
Soft start function
13
Frequency selection
13
Sync
14
LED current setting and LED dimming
15
PWM dimming
15
APWM pin
16
Analog dimming
18
Description (continued)
The A8521 is provided in a 20-pin TSSOP package (suffix LP) with
an exposed pad for enhanced thermal dissipation. It is lead (Pb) free,
with 100% matte tin lead frame plating.
Overvoltage protection
19
Boost switch overcurrent protection
21
Input overcurrent protection and
disconnect switch
22
Setting the current sense resistor
23
Input UVLO
23
VDD
23
Shutdown
23
Fault protection during operation
24
Application Information
26
Design Example for Boost Configuration
26
Design Example for SEPIC Configuration
30
Package Outline Drawing
34


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