Charge Pump. AAT3143 Datasheet

AAT3143 Pump. Datasheet pdf. Equivalent


Skyworks AAT3143
DATA SHEET
AAT3143
High Efficiency 1X/1.5X/2X Charge Pump
with PWM Control for White LED Applications
General Description
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 doubling (2X) conversion to
maximize efficiency for white LED applications. The
AAT3143 can deliver current levels up to 80mA to drive
white LEDs connected 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 appli-
cations.
Output current, and therefore brightness, is controlled
via externally applied Pulse Width Modulation (PWM)
control. Typically, PWM frequencies of up to 50kHz can
be applied.
The AAT3143 has a thermal management system to pro-
tect the device in the event of a short-circuit condition at
the voltage output pin. Built-in soft-start circuitry pre-
vents excessive inrush current during startup. A high
charge pump switching frequency allows the use of very
small external capacitors. A low current shutdown fea-
ture disconnects the load from VIN and reduces quiescent
current to less than 1µA.
The AAT3143 is available in a Pb-free, space-saving,
2.85x3.0mm 12-pin TSOPJW package.
Features
• 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
Applications
• Programmable Current Sources
• White LED Backlighting
• White Photo Flash for Digital Still Cameras
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
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202142A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 6, 2012
1


AAT3143 Datasheet
Recommendation AAT3143 Datasheet
Part AAT3143
Description High Efficiency 1X/1.5X/2X Charge Pump
Feature AAT3143; DATA SHEET AAT3143 High Efficiency 1X/1.5X/2X Charge Pump with PWM Control for White LED Applicatio.
Manufacture Skyworks
Datasheet
Download AAT3143 Datasheet




Skyworks AAT3143
DATA SHEET
AAT3143
High Efficiency 1X/1.5X/2X Charge Pump
with PWM Control for White LED Applications
Pin Descriptions
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
Symbol
C2+
CP
C1-
C1+
D3
D2
D4
D1
EN/PWM
IN
GND
C2-
Function
Flying capacitor 2 positive terminal. Connect a 1µF capacitor between C2+ and C2-.
Charge pump output. Requires 1µF capacitor connected between this pin and ground.
Flying capacitor 1 negative terminal.
Flying capacitor 1 positive terminal. Connect a 1µF capacitor between C1+ and C1-.
Current source output #3.
Current source output #2.
Current source output #4.
Current source output #1.
Enable/PWM control pin.
Input power supply. Requires 1µF capacitor connected between this pin and ground.
Ground.
Flying capacitor 2 negative terminal.
Pin Configuration
TSOPJW-12
(Top View)
C2+
CP
C1-
C1+
D3
D2
1
2
3
4
5
6
12 C2-
11 GND
10 IN
9 EN/PWM
8 D1
7 D4
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
2 202142A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 6, 2012



Skyworks AAT3143
DATA SHEET
AAT3143
High Efficiency 1X/1.5X/2X Charge Pump
with PWM Control for White LED Applications
Absolute Maximum Ratings1
Symbol
VIN
VEN/PWM
IOUT2
TJ
TLEAD
Description
Input Voltage
EN/PWM to GND Voltage
Maximum DC Output Current
Operating Junction Temperature Range
Maximum Soldering Temperature (at leads, 10 sec)
Value
-0.3 to 6
-0.3 to VIN + 0.3
80
-40 to 150
300
Units
V
V
mA
°C
°C
Thermal Information3
Symbol
PD
qJA
Description
Maximum Power Dissipation4
Maximum Thermal Resistance
Value
0.625
160
Units
W
°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.
2. Based on long-term current density limitation.
3. Mounted on an FR4 board.
4. Derate 6.25 mW/°C above 25°C.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202142A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 6, 2012
3







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