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PDF AAT3143 Data sheet ( Hoja de datos )
| Número de pieza | AAT3143 | |
| Descripción | High Efficiency 1X/1.5X/2X Charge Pump | |
| Fabricantes | AAT | |
| Logotipo |  |
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AAT3143
High Efficiency 1X/1.5X/2X Charge Pump with
PWM Control for White LED Applications
General Description
Features
ChargePump™
The AAT3143 is a low noise, constant frequency
charge pump DC/DC converter that uses a tri-
mode load switch (1X), fractional (1.5X), and dou-
bling (2X) conversion to maximize efficiency for
white LED applications. The AAT3143 can deliver
current levels up to 80mA to drive white LEDs con-
nected to the four current source outputs from a
2.7V to 5.5V input. The current source outputs may
source up to 20mA each and may be operated indi-
vidually or in parallel for driving higher-current
LEDs. A low external parts count (two 1µF flying
capacitors and two small 1µF capacitors at VIN and
VOUT) makes the AAT3143 ideally suited for small
battery-powered applications.
• Input Voltage Range: 2.7V to 5.5V
• PWM Brightness Control
• Tri-Mode 1X, 1.5X, and 2X Charge Pump for
Maximum Efficiency and VF Coverage
• Drives Four Low- or High-VF Type LEDs
• Up to 20mA LED Current per Channel
• No Inductors
• 1MHz Switching Frequency
• Small Application Circuit
• AutoBias™ Technology
• IQ <1µA in Shutdown
• 2.85x3.0mm TSOPJW-12 Package
Output current, and therefore brightness, is con-
trolled via externally applied Pulse Width Modulation
Applications
(PWM) control. Typically, PWM frequencies of up to
50kHz can be applied.
• Programmable Current Sources
• White LED Backlighting
The AAT3143 has a thermal management system to
• White Photo Flash for Digital Still Cameras
protect the device in the event of a short-circuit con-
dition at the voltage output pin. Built-in soft-start cir-
www.DataSheet4U.com
cuitry prevents excessive inrush current during start-
up. A high charge pump switching frequency allows
the use of very small external capacitors. A low cur-
rent shutdown feature disconnects the load from VIN
and reduces quiescent current to less than 1µA.
The AAT3143 is available in a Pb-free, space-sav-
ing, 2.85x3.0mm 12-pin TSOPJW package.
Typical Application
2.7V to 5.5V
PWM/EN
IN
CIN
1µF
C1+
C1-
C2+
C2-
AAT3143 CP
D1
EN/PWM
D2
D3
D4
GND
C1
1µF
C2
1µF
D4 D3 D2 D1
COUT
1µF
3143.2006.05.1.0
1
1 page  
AAT3143
High Efficiency 1X/1.5X/2X Charge Pump with
PWM Control for White LED Applications
Typical Characteristics
VIN = 3.5V, CIN = CCP = C1 = C2 = 1µF, TA = 25°C, unless otherwise noted.
Efficiency
(100% Duty Cycle, 4x20mA/channel)
100
Turn-On to 1X Mode
(VIN = 4.2V)
90
80
70
60
50
40
30
2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4.2
VEN
(1V/div)
VCP
(2V/div)
VLED
(2V/div)
IIN
(100mA/div)
Input Voltage (V)
Time (50µs/div)
VEN
(1V/div)
VCP
(2V/div)
VLED
(2V/div)
IIN
(50mA/div)
Turn-On to 1.5X Mode
(VIN = 3.5V)
Time (50µs/div)
VEN
(1V/div)
VCP
(2V/div)
VLED
(2V/div)
IIN
(50mA/div)
Turn-On to 2X Mode
(VIN = 2.7V)
Time (50µs/div)
VEN
(2V/div)
VLED
(2V/div)
ILED
(10mA/div)
LED Turn-On Delay
(PWM Frequency = 500Hz)
Time (5µs/div)
VEN
(2V/div)
VLED
(2V/div)
ILED
(10mA/div)
LED Turn-On Delay
(PWM Frequency = 5kHz)
Time (1µs/div)
3143.2006.05.1.0
5
5 Page 
AAT3143
High Efficiency 1X/1.5X/2X Charge Pump with
PWM Control for White LED Applications
Ordering Information
Package
TSOPJW-12
Marking1
ROXYY
Part Number (Tape and Reel)2
AAT3143ITP-T1
All AnalogicTech products are offered in Pb-free packaging. The term “Pb-free” means
semiconductor products that are in compliance with current RoHS standards, including
the requirement that lead not exceed 0.1% by weight in homogeneous materials. For more
information, please visit our website at http://www.analogictech.com/pbfree.
Package Information
0.20
+
-
0.10
0.05
TSOPJW-12
0.50 BSC 0.50 BSC 0.50 BSC 0.50 BSC 0.50 BSC
3.00 ± 0.10
7° NOM
0.04 REF
All dimensions in millimeters.
0.055 ± 0.045
0.010
4° ± 4°
2.75 ± 0.25
0.45 ± 0.15
1. XYY = assembly and date code.
2. Sample stock is generally held on part numbers listed in BOLD.
© Advanced Analogic Technologies, Inc.
AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech product. No circuit patent licenses, copyrights, mask work rights,
or other intellectual property rights are implied. AnalogicTech reserves the right to make changes to their products or specifications or to discontinue any product or service without notice.
Customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold sub-
ject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. AnalogicTech
warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with AnalogicTech’s standard warranty. Testing and other quality con-
trol techniques are utilized to the extent AnalogicTech deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed.
AnalogicTech and the AnalogicTech logo are trademarks of Advanced Analogic Technologies Incorporated. All other brand and product names appearing in this document are regis-
tered trademarks or trademarks of their respective holders.
Advanced Analogic Technologies, Inc.
830 E. Arques Avenue, Sunnyvale, CA 94085
Phone (408) 737-4600
Fax (408) 737-4611
3143.2006.05.1.0
11
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| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet AAT3143.PDF ] | |
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