Charge Pump. AAT3142 Datasheet

AAT3142 Pump. Datasheet pdf. Equivalent

AAT3142 Datasheet
Recommendation AAT3142 Datasheet
Part AAT3142
Description High Efficiency 1X/1.5X/2X Charge Pump
Feature AAT3142; DATA SHEET AAT3142 High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications General Descri.
Manufacture Skyworks
Datasheet
Download AAT3142 Datasheet




Skyworks AAT3142
DATA SHEET
AAT3142
High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
General Description
The AAT3142 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
device produces current levels up to 30mA on each of its
three current source outputs to drive various arrange-
ments of LEDs from a 2.7V to 5.5V input. Outputs may
be operated individually 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 CP)
make the AAT3142 ideally suited for small battery-pow-
ered applications.
Skyworks' Simple Serial Control™ (S2Cwire™) digital
input is used to enable, disable, and set the LED drive
current with a 32-level logarithmic scale LED brightness
control. The AAT3142 has a thermal management sys-
tem to protect the device in the event of a short-circuit
condition at an output pin. Built-in soft-start circuitry
prevents excessive inrush current during start-up. A high
charge pump switching frequency enables the use of
very small external capacitors. In shutdown mode, the
device disconnects the load from VIN and reduces quies-
cent current to less than 1µA. The AAT3142 is available
in the very small, Pb-free 12-pin TSOPJW package.
Features
VIN Range: 2.7V to 5.5V
Tri-Mode 1X, 1.5X, and 2X Charge Pump for Maximum
Efficiency and VF Coverage
Drives Low-VF and High-VF Type LEDs
Up to Three 30mA Outputs
32-Position Logarithmic Scale with Digital Control
Low Noise Constant Frequency Operation
1MHz Switching Frequency
Small Application Circuit
Regulated Output Current
Automatic Soft Start
No Inductors
IQ < 1µA in Shutdown
12-Pin TSOPJW Package
Applications
Color (RGB) Lighting
Programmable Current Sources
White LED Backlighting
White Photo Flash for Digital Still Cameras
Typical Application
VBATTERY
CIN CCP
1µF 1µF
EN/SET
VIN C1+
CP C1-
C2+
AAT3142
C2-
D1
D2
D3
EN/SET
GND
C1
1µF
C2
1µF
D3 D2 D1
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202141A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 6, 2012
1



Skyworks AAT3142
DATA SHEET
AAT3142
High Efficiency 1X/1.5X/2X Charge Pump 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
GND
D1
EN/SET
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.
Ground pin; must be connected to Pin 11.
Current source output #1.
S2Cwire serial interface control pin.
Input power supply. Requires 1µF capacitor connected between this pin and ground.
Ground pin; must be connected to Pin 7.
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/SET
8 D1
7 GND
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
2 202141A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 6, 2012



Skyworks AAT3142
DATA SHEET
AAT3142
High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
Absolute Maximum Ratings1
Symbol
VIN
VEN/SET
IOUT2
TJ
Description
Input Voltage
EN/SET to GND Voltage
Maximum DC Output Current
Operating Junction Temperature Range
Value
-0.3 to 6
-0.3 to VIN + 0.3
150
-40 to 150
Units
V
V
mA
°C
Thermal Information3
Symbol
PD
qJA
Description
Maximum Power Dissipation4
Thermal Resistance
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.
2. Based on long-term current density limitation.
3. Mounted on an FR4 board.
4. Derate 6.25mW/°C above 25°C.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202141A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 6, 2012
3







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