LED Applications. AAT3153 Datasheet

AAT3153 Applications. Datasheet pdf. Equivalent

Part AAT3153
Description High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications
Feature www.DataSheet4U.com AAT3153 High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications Gener.
Manufacture Advanced Analogic Technologies
Datasheet
Download AAT3153 Datasheet



AAT3153
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AAT3153
High Efficiency 1X/1.5X/2X Charge Pump
For White LED Applications
General Description
Features
ChargePump
The AAT3153 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 AAT3153 is capable of driving six-
channel LEDs from a 2.7V to 5.5V input. The current
sinks may be operated individually or in parallel for
driving higher-current LEDs. Low external parts
count (two 1µF flying capacitors and two small 1µF
capacitors at VIN and VOUT) makes this part ideally
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 eight settings (20mA
down to 50µA) including main and sub-display
group control. The AAT3153 consumes extremely
low current internally (40µA typical) at light load for
optimized efficiency.
• VIN Range: 2.7V to 5.5V
• Fully Programmable Current with Single Wire
• Eight-Step Current: 20mA-50µA
• Individual Main-Sub Group Control
• Low IQ (40µA) at Light Load
• Tri-Mode 1X, 1.5X, and 2X Charge Pump for
Maximum Efficiency and VF Coverage
• Drives Up to Six Channels of LEDs
• No Inductors, Low Noise Operation
• 1MHz Constant Switching Frequency
• Small Application Circuit
• Built-In Thermal Protection
• Built-In Auto-Disable for Short-Circuit
• Automatic Soft-Start
• IQ <1µA in Shutdown
• Thermal-Enhanced 4x4mm16-Pin QFN
Package
Each output of the AAT3153 is equipped with built-
in protection for VOUT short circuit and auto-disable
for load short-circuit condition. Built-in soft-start cir-
www.DataSheet4U.comcuitry prevents excessive inrush current during
start-up. A low current shutdown feature discon-
nects the load from VIN and reduces quiescent cur-
rent to less than 1µA.
Applications
• Color (RGB) Lighting
• Programmable Current Sinks
• White LED Backlighting
• White Photo-Flash for DSCs
The AAT3153 is available in a space-saving, thermal-
enhanced 16-pin 4x4mm QFN package.
Typical Application
2.7V to 5.5V
VIN C1+
CIN C1-
1µF C2+
AAT3153
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
3153.2004.10.0.6
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AAT3153
www.DataSheet4U.com
AAT3153
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 S2Cwire 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 + terminal. Connect a 1µF capacitor between C2+ and C2-.
C1+ Flying capacitor 1 + terminal. Connect a 1µF capacitor between C1+ and C1-.
C1- Flying capacitor 1 - terminal.
C2- Flying capacitor 2 - terminal.
GND
Ground.
IN Input power supply. Requires 1µF capacitor connected between this pin and
ground.
GND
Ground.
D1 Current sink input #1.
www.DataSheet4U.comD2 Current sink input #2.
D3 Current sink input #3.
D4 Current sink input #4.
D5 Current sink input #5.
Exposed paddle (bottom). Connect to ground.
Pin Configuration
QFN44-16
(Top View)
D6 1
EN/SET 2
N/C 3
VOUT 4
AAT3153
12 D1
11 GND
10 IN
9 GND
2 3153.2004.10.0.6
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