A8530EESTR-T Allegro Microsystems Inc, A8530EESTR-T Datasheet - Page 11

• 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

A8530
Overvoltage Protection
The A8530 is protected up to 4.9 V supply voltage, against
accidental overvoltage caused by an open LED. When any LED
opens, V
to function normally. Normal operation will be resumed when the
fault is removed.
LED Disconnection
Every LEDx pin has a disable subcircuit, as shown in figure 8.
The A8530 compares the voltage on each LED pin, and if
the voltage on the pin is greater than either V
V
If any WLED is not used, connect the corresponding pin to
VOUT. Never leave open any unused WLED pin. LED pins will
sink 20 μA typical when connected to VOUT and the correspond-
IN
– 0.4 V, then the corresponding LED pin is disabled.
OUT
will increase till 6 V. Remaining LEDs will continue
V BATT
Figure 8. LED disable subcircuit. Subcircuit for one LEDx pin shown. A similar block is
connected to each LEDx pin.
CIN
VIN
A8530
OUT
LED Disable Block
One of six blocks
– 0.4 V or
Charge Pump
1×, 1.5×, 2×
–
–
+
+
V
V
IN
OUT
ing LED group (main or sub) is enabled.
Note: In shutdown mode (ENM = ENS = 0 V for > 0.5 ms), the
total leakage current is < 1μA.
Thermal Shutdown
The IC is internally protected against overtemperature. The
overtemperature limit is set to 165°C nominal. The IC shuts down
when the junction temperature exceeds 165°C and automatically
turns on again when the IC cools.
Component Selection
Ceramic capacitors with X5R or X7R dielectric are recom-
mended for the input capacitor, CIN, the output capacitor, COUT,
and the charge pump capacitors, C1 and C2.
– 0.4
– 0.4
and Flash/Torch White LED Driver
Ultracompact 6-Channel Backlight
Current
Sink
VOUT
LED1
COUT
115 Northeast Cutoff, Box 15036
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com
D1
D2
D3
D4
D5
D6
10