AAT3156 Applications Datasheet

AAT3156 Datasheet, PDF, Equivalent


Part Number

AAT3156

Description

High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications

Manufacture

Advanced Analogic Technologies

Total Page 14 Pages
Datasheet
Download AAT3156 Datasheet


AAT3156
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AAT3156
High Efficiency 1X/1.5X/2X Charge Pump
For White LED Applications
General Description
Features
ChargePump
The AAT3156 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 AAT3156 is capable of
driving six-channel LEDs at a total of 180mA from
a 2.7V to 5.5V input. The current sinks may be
operated individually or in parallel for driving high-
er-current LEDs. A low external parts count (two
1µF flying capacitors and two small 1µF capacitors
at VIN and VOUT) make this part ideally suited for
small battery-powered applications.
AnalogicTech's AS2Cwire™ (Advanced Simple
Serial Control™) serial digital input is used to
enable, disable, and set current for each LED with
a 16-level logarithmic scale plus four low-current
settings down to 50µA for optimized efficiency, with
a low housekeeping current of only 50µA.
• VIN Range: 2.7V to 5.5V
• Fully Programmable Current with Single Wire
— 16-Step Logarithmic Scale
— 15/20/30mA Max Current
— 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 Six Channels of LEDs
• Individual Main/Sub-Group Control
• No Inductors, Low Noise Operation
• 1MHz Constant Switching Frequency
• Small Application Circuit
• Built-In Thermal Protection
• Built-In Auto-Disable For Open Circuit
• Automatic Soft-Start
• IQ <1µA in Shutdown
• Thermally-Enhanced QFN44-16 Package
Each output of the AAT3156 is equipped with built-
in protection for VOUT short circuit and auto disable
for LED failure condition. Built-in soft-start circuitry
www.DataSheet4U.comprevents excessive inrush current during start-up.
Applications
A low current shutdown feature disconnects the
• Color (RGB) Lighting
load from VIN and reduces quiescent current to less
than 1µA.
• Programmable Current Sinks
• White LED Backlighting
The AAT3156 is available in a space-saving, ther-
• White Photo Flash for DSCs
mally-enhanced 16-pin 4x4mm QFN package.
Typical Application
2.7V to 5.5V
VIN C1+
CIN C1-
1µF
C2+
AAT3156
C2-
VOUT
EN/SET
EN/SET
GND
D1
D2
D3
D4
D5
D6
C1
1µF
C2
1µF
D1 D2 D3 D4 D5 D6
COUT
1µF
3156.2005.06.1.1
1
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AAT3156
www.DataSheet4U.com
AAT3156
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
13
14
15
16
EP
Symbol Function
D6 Current sink input #6.
EN/SET AS2Cwire serial interface control pin.
N/C No connection.
VOUT
Charge pump output to drive load circuit. Requires 1µF capacitor connected between
this pin and ground.
C2+ Flying capacitor 2 positive terminal. Connect a 1µF capacitor between C2+ and C2-.
C1+ Flying capacitor 1 positive terminal. Connect a 1µF capacitor between C1+ and C1-.
C1- Flying capacitor 1 negative terminal.
C2- Flying capacitor 2 negative terminal.
GND Ground.
IN Input power supply. Requires 1µF capacitor connected between this pin and ground.
GND Ground.
D1 Current sink input #1.
D2 Current sink input #2.
www.DataSheet4U.comD3 Current sink input #3.
D4 Current sink input #4.
D5 Current sink input #5.
Exposed paddle (bottom); connect to GND directly beneath package.
Pin Configuration
QFN44-16
(Top View)
D6 1
EN/SET 2
N/C 3
VOUT 4
AAT3156
12 D1
11 GND
10 IN
9 GND
2 3156.2005.06.1.1
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Features www.DataSheet4U.com AAT3156 High Effici ency 1X/1.5X/2X Charge Pump For White L ED Applications General Description The AAT3156 is a low noise, constant frequ ency charge pump DC/DC converter that u ses a trimode load switch (1X), fractio nal (1.5X), and doubling (2X) conversio n to maximize efficiency for white LED applications. The AAT3156 is capable of driving six-channel LEDs at a total of 180mA from a 2.7V to 5.5V input. The c urrent sinks may be operated individual ly or in parallel for driving higher-cu rrent LEDs. A low external parts count (two 1µF flying capacitors and two sma ll 1µF capacitors at VIN and VOUT) mak e this part ideally suited for small ba ttery-powered applications. AnalogicTec h's AS2Cwire™ (Advanced Simple Serial Control™) serial digital input is us ed to enable, disable, and set current for each LED with a 16-level logarithmi c scale plus four low-current settings down to 50µA for optimized efficiency, with a low housekeeping current of only 50µA. Each output of the AAT3.
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