AAT3104IJQ-1-T1 ANALOGICTECH [Advanced Analogic Technologies], AAT3104IJQ-1-T1 Datasheet

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AAT3104IJQ-1-T1

Manufacturer Part Number
AAT3104IJQ-1-T1
Description
Low Cost 1x/2x 4 Channel Charge Pump WLED Driver
Manufacturer
ANALOGICTECH [Advanced Analogic Technologies]
Datasheet
1.AAT3104IJQ-1-T1.pdf (15 pages)
General Description
The AAT3104 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 accuracy and matching.
The AAT3104 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 AnalogicTech’s pat-
ented S
available in a 2x2mm 10-lead SC70JW-10 package.
Typical Application
ChargePump
3104.2008.09.1.0
2
Cwire™ single wire interface. The AAT3104 is
Input Voltage
2.7V to 5.5V
Interface
S
EN/SET
TM
2
Cwire
1µF
C
IN
1µF
C
P
Low Cost 1x/2x 4 Channel Charge Pump WLED Driver
w w w . a n a l o g i c t e c h . c o m
IN
C+
EN/SET
C-
AAT3104
GND
Features
• Drives up to 4 LEDs at up to 31mA each
• Automatic Switching Between 1x and 2x Modes
• 1MHz Switching Frequency
• Linear LED Output Current Control
• Single-wire, S
• ±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
• Cordless Phone Handsets
• Digital Cameras
• Mobile Phone Handsets
• MP3 and PMP Players
AAT3104-1: 16-step
AAT3104-2: 32-step
OUT
D1
D2
D3
D4
C
1µF
2
OUT
Cwire Interface
PRODUCT DATASHEET
AAT3104178
1

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AAT3104IJQ-1-T1 Summary of contents

Page 1

ChargePump TM General Description The AAT3104 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 ...

Page 2

ChargePump ChargePump TM TM Pin Descriptions Pin# Name Description LED2 Current Source Output the output of LED2 current source. Connect LED2’s anode and its cathode to GND. LED1 Current Source Output the ...

Page 3

ChargePump ChargePump TM TM Absolute Maximum Ratings Symbol Description OUT C+ IN, C+, C-, OUT, D1, D2, D3, and D4 Pin Voltages to GND D1...4 V EN/SET Pin Voltage ...

Page 4

ChargePump ChargePump TM TM Electrical Characteristics 3.6V 1μ 1μ OUT = 25°C. Symbol Description Input Power Supply V Input Voltage Range IN I Quiescent Current Load Operating ...

Page 5

ChargePump ChargePump TM TM Typical Characteristics V = 3.6V 1μ OUT 1X Mode Turn-On Waveform (V = 4.2V; Load = 120mA LED (2V/div (200mA/div) V ...

Page 6

ChargePump ChargePump TM TM Typical Characteristics V = 3.6V 1μ OUT Current Matching vs. Temperature (AAT3104-2; Code = 1) 33.0 32.5 32.0 31.5 31.0 30.5 30.0 29.5 29.0 -40 -15 10 ...

Page 7

ChargePump ChargePump TM TM Typical Characteristics V = 3.6V 1μ OUT No Load Operating Current vs. Input Voltage (2x Mode) 6.4 6.2 6.0 5.8 5.6 5.4 5.2 5.0 2.7 3.1 3.5 ...

Page 8

ChargePump TM Functional Block Diagram IN EN/SET Functional Description The AAT3104 is a low-cost charge-pump solution designed to drive up to four white LEDs. The charge pump operates from a 2.7V to 5.5V power source and converts it to voltage ...

Page 9

ChargePump TM current reduces system noise and improves LED reliabil- ity. The S Cwire interface relies on the number of rising 2 edges to the EN/SET pin to set the register. A typical write protocol is a burst of EN/SET ...

Page 10

ChargePump TM 30.0 22.5 15.0 7 Wire Interface Data Code Figure 2: AAT3104-1 Current Control Profile. Applications Information LED Selection ...

Page 11

ChargePump TM to outputs D1 through for a given constant current set- ting. Depending on the combination of V sensed at the current sources, the device will operate in load switch mode. When any one of the voltages sensed at ...

Page 12

ChargePump TM Input Voltage 2.7V to 5.5V EN/SET S 2 Cwire Interface Figure 4: Higher Current, Single LED Application. Input Voltage > DROP EN/SET 2 S Cwire Interface Equivalent Series Resistance ESR is an important characteristic ...

Page 13

ChargePump ChargePump TM TM Evaluation Board Schematic J1 DC+ VIN 10uF DC - JP5 C1 1µF Figure 6: AAT3104 Evaluation Board Schematic. Figure 6: AAT3104 Evaluation Board Top Layer. 3104.2008.09.1.0 3104.2008.09.1.0 Low Cost 1x/2x ...

Page 14

... End View PRODUCT DATASHEET PRODUCT DATASHEET AAT3104178 AAT3104178 Part Number (Tape and Reel) 1 AAT3104IJQ-1-T1 AAT3104IJQ-2-T1 4° ± 4° 3104.2008.09.1.0 3104.2008.09.1.0 2 ...

Page 15

ChargePump ChargePump TM TM Advanced Analogic Technologies, Inc. 3230 Scott Boulevard, Santa Clara, CA 95054 Phone (408) 737-4600 Fax (408) 737-4611 © Advanced Analogic Technologies, Inc. AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied ...

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