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A8530 Datasheet Preview

A8530 Datasheet

Ultracompact 6-Channel Backlight and Flash/Torch White LED Driver

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A8530
Ultracompact 6-Channel Backlight
and Flash/Torch White LED Driver
Features and Benefits
Proprietary adaptive control scheme (1×, 1.5×, 2×)
0.5% typical LED current matching
2 separate serial interfaces for dimming control
Drives up to 6 white LEDs (4 display backlight, 2 flash/torch)
30 mA per LED channel for display backlight
100 mA per LED channel for flash/torch backlight
320 mA total output current capability
Low EMI design and soft-start function
Short circuit, overvoltage, thermal shutdown protection
0.75 mm very thin profile, 3 mm × 3 mm package
Package: 16 pin QFN/MLP (suffix ES)
Description
The A8530 high efficiency charge pump ICs offer a simple,
low-cost white LED driver solution for driving four display
backlight and two flash/torch/video mode white LEDs. Using
a proprietary control scheme (1×, 1.5×, and 2×), the A8530
can deliver well-matched LED current while maintaining the
highest efficiency and low EMI. The LED current is regulated
over the entire range of Li+ battery voltage to provide uniform
intensity.
LED brightness and on/off can be controlled for 4 display
backlight LEDs and 2 flash/torch LEDs through 2 single-wire
serial interface pins.
TheA8530 is available in a very thin profile (0.75 mm nominal
height) 3 mm× 3 mm QFN/MLP 16 pin package. Applications
include:
White LED backlights for cellular phones, PDAs
Digital cameras, camcorders
Other portable device white LED backlighting
320 mA WLED flash/torch
Approximate Scale 1:1
www.DataSheet4U.com
Typical Applications
VBATT
2.7 to 5.5 V
CIN
4.7 µF
C1
1 µF
C2
1 µF
RSET
On/Off and
Dimming
Control
VIN VOUT
C1+ LED1
C1– LED2
C2+ A8530
LED3
C2–
ISET
LED4
ENM
LED5
ENF GND LED6
COUT
4.7 µF
D1
D2
D3
D4
D5
D6
D1-D4 Backlight; D5-D6 Flash
Figure 1. 4 × 30 mA backlight with 2 × 100 mA flash
VBATT
2.7 to 5.5 V
CIN
4.7 µF
C1
1 µF
C2
1 µF
RSET
On/Off and
Dimming
Control
VIN VOUT
C1+ LED1
C1– LED2
C2+ A8530
LED3
C2–
ISET
LED4
ENM
LED5
ENF GND LED6
COUT
4.7 µF
D1
8530-DS
Figure 3. 320 mA flash
VBATT
2.7 to 5.5 V
CIN
4.7 µF
C1
1 µF
C2
1 µF
RSET
On/Off and
Dimming
Control
VIN VOUT
COUT
4.7 µF
C1+
LED1
D1
C1– LED2
C2+ A8530
LED3
C2–
ISET
LED4
ENM
LED5
ENF GND LED6
D5
D6
D1-D4 Backlight; D5-D6 Flash
Figure 2. 3 × 100 mA flash
VBATT
CIN
1 μF
RSET
On/Off and
Dimming
Control
VIN VOUT
C1+
LED1
D1
C1–
LED2
D2
C2+ A8530
D3
LED3
C2– D4
ISET
LED4
D5
ENM
LED5
D6
ENF GND LED6
D1-D4 Main; D5-D6 Flash
VIN>Vf(max)+0.2 V, Vf = LED forward drop
Figure 4. High efficiency current sink




Allegro MicroSystems

A8530 Datasheet Preview

A8530 Datasheet

Ultracompact 6-Channel Backlight and Flash/Torch White LED Driver

No Preview Available !

A8530
Ultracompact 6-Channel Backlight
and Flash/Torch White LED Driver
VIN
CIN
4.7 µF
ENM
ENF
ISET
RSET
Functional Block Diagram
C1
1 µF
C2
1 µF
C1+ C1 – C2+ C2–
Control, Clock,
and Reference
Fractional Charge Pump
(1×, 1.5×, and 2×)
+
Minimum Select
Current Mirror
IREF
IREF
+
+
+
+
+
+
VOUT
COUT
4.7 µF
LED1
LED2
LED3
LED4
LED5
LED6
GND
Absolute Maximum Ratings
Input or Output Voltage
VIN, VOUT, C1+, C1– , C2+, C2– to GND ..................... –0.3 to 6 V
All other pins..................................................... –0.3 to VIN + 0.3 V
VOUT Short Circuit to GND ....................................................Continuous
Operating Ambient Temperature, TA ..................................... –40°C to 85°C
Junction Temperature, TJ(max).............................................................. 150°C
Storage Temperature, TS ................................................... –55°C to 150°C
Package Thermal Characteristics
Package Thermal Resistance, RθJA = 68 °C/W
(vendor data, on 4-layer PCB; unverified)
Device package is lead (Pb) free, with 100% matte tin leadframe
plating.
Use the following complete part number when ordering:
Part Number
Packaging*
A8530EESTR-T
7-in. reel, 1500 pieces/reel
*Contact Allegro for additional packing options.
Package Type
ES, 3 × 3 mm MLP-16
Allegro MicroSystems, Inc.
2
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com


Part Number A8530
Description Ultracompact 6-Channel Backlight and Flash/Torch White LED Driver
Maker Allegro MicroSystems
Total Page 11 Pages
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