Charge Pump. AAT3155 Datasheet

AAT3155 Pump. Datasheet pdf. Equivalent


Part AAT3155
Description High Efficiency 1X/1.5X/2X Charge Pump
Feature www.DataSheet4U.com High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications General Descr.
Manufacture AAT
Datasheet
Download AAT3155 Datasheet


www.DataSheet4U.com High Efficiency 1X/1.5X/2X Charge Pump AAT3155 Datasheet
DATA SHEET AAT3155 High Efficiency 1X/1.5X/2X Charge Pump fo AAT3155 Datasheet
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AAT3155
www.DataSheet4U.com
AAT3155
High Efficiency 1X/1.5X/2X Charge Pump
For White LED Applications
General Description
Features
ChargePump
The AAT3155 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 AAT3155 is capable of
driving up to four channels of LEDs at 20mA per
channel from a 2.7V to 5.5V input. The current
sinks 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 IN and OUTCP) make this part ideal-
ly suited for small, battery-powered applications.
AnalogicTech's S2Cwire(Simple Serial Control)
serial digital input is used to enable, disable, and set
current for each LED with 16 settings down to 50μA.
The low-current mode supply current can be as low
as 50μA to save power.
Each output of the AAT3155 is equipped with built-
in protection for output short-circuit and auto-dis-
able for load short-circuit conditions. Built-in soft-
start circuitry prevents excessive inrush current
during start-up. A low-current shutdown feature dis-
connects the load from the input and reduces qui-
escent current to less than 1μA.
The AAT3155 is available in a Pb-free, space-sav-
ing 2.85x3.0mm 12-pin TSOPJW package.
• VIN Range: 2.7V to 5.5V
• Fully Programmable Current with Single Wire
— 16 Current Levels
— Four Low Current Settings Down to 50µA
• Low IQ (50µA) for Low Current Mode
• Tri-Mode 1X, 1.5X, and 2X Charge Pump for
Maximum Efficiency and VF Coverage
• Drives up to Four Channels of LEDs
• No Inductors, Low Noise Operation
• 1MHz Constant Switching Frequency
• Small Application Circuit
• Built-In Thermal Protection
• Automatic Soft Start
• IQ <1µA in Shutdown
• 2.85x3.0mm TSOPJW-12 Package
Applications
• Color (RGB) Lighting
• Programmable Current Sinks
• White LED Backlighting
• White Photo Flash for Digital Still Cameras
Typical Application
C1
1µF
2.7V to 5.5V
CIN
1µF
EN/SET
C1+ C2+
C1- C2-
IN OUTCP
AAT3155
GND
EN/SET
D1
D2
D3
D4
C2
1µF
D1 D2 D3 D4
COUT
1µF
3155.2006.05.1.1
1



AAT3155
www.DataSheet4U.com
AAT3155
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
D3
D2
D1
GND
IN
C2-
C2+
OUTCP
C1-
C1+
EN/SET
D4
Function
Current sink input #3.
Current sink input #2.
Current sink input #1.
Ground.
Input power supply. Requires 1µF capacitor connected between this pin and
ground.
Flying capacitor 2 negative terminal.
Flying capacitor 2 positive terminal. Connect a 1µF capacitor between C2+ and
C2-.
Charge pump output to drive load circuit. 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-.
S2Cwire serial interface control pin.
Current sink input #4.
Pin Configuration
TSOPJW-12
(Top View)
D3
D2
D1
GND
IN
C2-
1
2
3
4
5
6
12 D4
11 EN/SET
10 C1+
9 C1-
8 OUTCP
7 C2+
2 3155.2006.05.1.1







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