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.
Very simple question, please guide: we generate a sin function, and want to do fft on it to get the spectrum, but the generated time domain waveform and frequency domain waveform are not correct. Is t...
Pocket PC 2003 SE emulator, I have downloaded netsvwrap.msi and installed the virtual driver, but in the "Enable NE2000 PCMCIA network adapter and bind to" drop-down option, there is no virtual driver...
Hello everyone! I use Advantech's PCI-1712 data acquisition card to make a program. I have now realized data acquisition through the examples provided by Advantech. My main questions are as follows: 1...
As a wireless broadband metropolitan area network standard, WiMAX technology has greater advantages than previous 3.5GHz MMDS products in terms of non-line-of-sight transmission and spectrum utiliz...[Details]
In recent years, the market for mobile/portable devices such as smartphones and laptops has continued to grow rapidly. While these products continue to integrate more new features to enhance the ...[Details]
1. Introduction
Light control circuit plays a vital role in urban street lamps or corridor lighting. With light control circuit, the lights can be automatically turned on and off according to ...[Details]
With the advocacy and implementation of the government's Safe City Plan, the security market has increasingly higher requirements for the clarity of surveillance images. Imagine that after a case o...[Details]
Introduction
Nowadays, people pay more and more attention to the security alarm system, and people have higher and higher requirements for the functions and performance of the alarm. This paper prop...[Details]
Leakage current is generated by parasitic resistance paths between the measurement circuit and a nearby voltage source. This current can significantly reduce the accuracy of low current measurement...[Details]
Currently, high-frequency and high-efficiency DCDC converters are increasingly used in automotive electronic systems.
High switching frequency can use smaller power inductors and output filter...[Details]
Power supply is often the most easily overlooked link in the circuit design process. In fact, as an excellent design, power supply design should be very important, which greatly affects the perfor...[Details]
The overall operating performance of an electric car depends first on its battery system and motor drive system. The drive system of an electric car is generally composed of three main parts: a con...[Details]
1 Introduction
With the development of computer technology and information technology in the world, the global information age has arrived. All countries are formulating their own development p...[Details]
DigRF
is
poised to replace the two main forms of data communication paths between RF and baseband semiconductor devices:
analog
signaling, and proprietary digital signaling (paralle...[Details]
TMC428 is a stepper motor motion controller from TRINAMIC. It can reduce the workload of motor control software design and development costs. The 3-axis stepper motor drive control system based on ...[Details]
Various electronic and electromagnetic interference inside and outside the car often puts automotive electronic equipment in dangerous working conditions, degrading the performance of electronic eq...[Details]
With the rapid development of information technology represented by computers, semi-physical simulation technology plays an important role in many military and civilian fields such as aerospace and co...[Details]
TI Technology Forum
京公网安备 11010802033920号
EEWORLD
