The AAT3105 is a charge-pump based, current-source
white LED driver capable of driving one to four LEDs up
to 30mA, each. It automatically switches between 1x
mode and 2x mode to maintain the highest efficiency
and optimal LED current matching.
The AAT3105 charge pump’s 1x mode (bypass mode)
has very low resistance, allowing LED current regulation
to be maintained with input supply voltage approaching
the LED forward voltage.
LED brightness is controlled using a universal PWM inter-
face. The AAT3105 is available in a Pb-free, 2x2mm
10-lead SC70JW-10 package
Low Cost 1x/2x 4 Channel Charge Pump WLED Driver
Features
•
•
•
•
•
•
•
•
•
•
•
Drives up to 4 LEDs at up to 30mA each
Automatic Switching Between 1x and 2x Modes
0.85MHz Switching Frequency
Linear LED Output Current Control
Universal PWM Interface
±10% LED Output Current Accuracy
±3% LED Output Current Matching
Low-current Shutdown Mode
Built-in Thermal Protection
Automatic Soft-start
Available in 2x2mm SC70JW-10 Package
Applications
•
•
•
•
Cell Phones
Digital Still Cameras
MP3 Players
Personal Data Assistants (PDAs)
Typical Application
IN
C+
C
IN
1µF
C
P
1µF
C-
EN/PWM
Interface
OUT
C
OUT
1µF
AAT3105
D1
D2
D3
EN/PWM
GND
D4
3105.2008.10.1.0
www.analogictech.com
1
PRODUCT DATASHEET
AAT3105178
ChargePump
TM
Pin Description
Pin #
1
2
3
4
5
6
7
8
9
10
Low Cost 1x/2x 4 Channel Charge Pump WLED Driver
Name
D2
D1
OUT
C-
C+
GND
EN/PWM
IN
D4
D3
Function
LED2 Current Source Output. D2 is the output of LED2 current source. Connect LED2’s anode to D2 and its
cathode to GND.
LED1 Current Source Output. D1 is the output of LED1 current source. Connect LED1’s anode to D1 and its
cathode to GND.
Charge Pump Output. OUT is the output of the charge pump. Bypass OUT to GND with a 1μF or larger ce-
ramic capacitor.
Charge Pump Capacitor Negative Node.
Charge Pump Capacitor Positive Node. Connect a 1μF ceramic capacitor between C+ and C-.
Analog Ground. Connect this pin to the system’s analog ground plane.
LED Enable and control input. EN/PWM is the ON/OFF control for the LED and the PWM input for the AAT3105
to control the LED brightness.
Power source input. Connect IN to the power source, typically the battery. Bypass IN to GND with a 1μF or
larger ceramic capacitor.
LED4 Current Source Output. D4 is the output of LED4 current source. Connect LED4’s anode to D4 and its
cathode to GND.
LED3 Current Source Output. D3 is the output of LED3 current source. Connect LED3’s anode to D3 and its
cathode to GND.
Pin Configuration
SC70JW-10
(Top View)
D2
D1
OUT
C-
C+
1
2
3
4
5
10
9
8
7
6
D3
D4
IN
EN/PWM
GND
2
www.analogictech.com
3105.2008.10.1.0
PRODUCT DATASHEET
AAT3105178
ChargePump
TM
Low Cost 1x/2x 4 Channel Charge Pump WLED Driver
Absolute Maximum Ratings
1
Symbol
V
IN
V
EN
T
S
T
J
T
LEAD
Description
IN, C+, C-, OUT, D1, D2, D3, and D4 Pin Voltages to GND
EN/PWM Pin Voltage to GND
Storage Temperature Range
Operating Junction Temperature Range
Maximum Soldering Temperature (at leads, 10 sec)
Value
-0.3 to 6.0
-0.3 to V
IN
+ 0.3
-65 to 150
-40 to 150
300
Units
V
V
°C
°C
°C
Thermal Information
Symbol
P
D
θ
JA
Description
Maximum Power Dissipation
2,3
Maximum Thermal Resistance
3
Value
625
160
Units
mW
°C/W
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions
specified is not implied. Only one Absolute Maximum Rating should be applied at any one time.
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