A8530EESTR-T Allegro Microsystems Inc, A8530EESTR-T Datasheet - Page 2

• Manufacturer Part Number: A8530EESTR-T
• Description: IC LED DRVR WHITE BCKLGHT 16-QFN
• Manufacturer: Allegro Microsystems Inc
• Type: Backlight, White LED (Serial Interface)r

Specifications of A8530EESTR-T

• Topology: Switched Capacitor (Charge Pump)
• Number Of Outputs: 6
• Internal Driver: Yes
• Type - Primary: Backlight, Flash/Torch
• Type - Secondary: White LED
• Frequency: 1MHz
• Voltage - Supply: 2.7 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 16-WFQFN Exposed Pad
• Operating Temperature: -40°C ~ 85°C
• Current - Output / Channel: 30mA, 100mA
• Internal Switch(s): Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -
• Efficiency: -
• Other names: 620-1201-2

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)
8530-DS, Rev. 1
Approximate Scale 1:1
Figure 1. 4 × 30 mA backlight with 2 × 100 mA flash
4.7 µF
4.7 µF
RSET
RSET
On/Off and
CIN
CIN
Dimming
On/Off and
Control
V BATT
2.7 to 5.5 V
V BATT
2.7 to 5.5 V
Dimming
Control
1 µF
1 µF
1 µF
1 µF
C1
C2
C2
C1
Figure 3. 320 mA flash
VIN
C1+
C1–
C2+
C2–
ISET
ENM
ENF
VIN
C1+
C1–
C2+
C2–
ISET
ENM
ENF
A8530
A8530
GND
GND
VOUT
VOUT
LED1
LED2
LED3
LED4
LED5
LED6
LED1
LED2
LED3
LED4
LED5
LED6
D1-D4 Backlight; D5-D6 Flash
D1
D2
D3
D4
D5
D6
D1
4.7 µF
4.7 µF
COUT
COUT
Typical Applications
and Flash/Torch White LED Driver
Ultracompact 6-Channel Backlight
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.
The A8530 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
4.7 µF
RSET
RSET
CIN
1 μF
On/Off and
CIN
On/Off and
Dimming
V BATT
2.7 to 5.5 V
Control
Dimming
V BATT
Figure 4. High efficiency current sink
Control
1 µF
1 µF
C1
C2
Figure 2. 3 × 100 mA flash
VIN
C1+
C1–
C2+
C2–
ISET
ENM
ENF
VIN
C1+
C1–
C2+
C2–
ISET
ENM
ENF
A8530
A8530
GND
GND
VOUT
LED1
LED2
LED3
LED4
LED5
LED6
VOUT
V
D1-D4 Backlight; D5-D6 Flash
LED1
LED2
LED3
LED4
LED5
LED6
IN
>V
f
(max)+0.2 V, V
D1-D4 Main; D5-D6 Flash
D1
D5
D6
D1
D2
D3
D4
D5
D6
f
= LED forward drop
A8530
4.7 µF
COUT