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Advanced Analogic Technologies

AAT3340 Datasheet Preview

AAT3340 Datasheet

High Efficiency 1x/1.5x Charge Pump

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ChargePumpTM
General Description
The AAT3340 is a low-noise, constant-frequency charge
pump DC/DC converter that uses a dual-mode load switch
(1x) and fractional (1.5x) conversion to maximize effi-
ciency for white LED applications. The AAT3340 is capable
of driving 4 white LEDs at a total of 80mA from a single
2.7V to 5.5V input. The current sinks may be operated
individually or in parallel while driving higher-current
LEDs. A low external parts count (two 1μF flying capacitors
and two small 1μF capacitors at VIN and VOUT) makes the
AAT3340 ideal for small battery-powered applications.
Analogic Tech’s Simple Serial Control (S2Cwire) digital
interface is used to enable, disable and set current to
one of 32 levels for the LEDs.
The AAT3340 is equipped with built-in short-circuit and
over-temperature protection. The soft-start circuitry pre-
vents excessive inrush current at start-up and mode
transitions. The AAT3340 family is available in Pb-free,
space-saving TSOPJW and TDFN33 packages, and oper-
ates over the -40°C to +85°C ambient temperature
range.
PRODUCT DATASHEET
AAT3340
High Efficiency 1x/1.5x Charge Pump
Features
• Dual-Mode (1x/1.5x) Charge Pump
• Drives up to 4-Channel Backlight LEDs
• 32-Level Programmable Backlight Current (linear,
inverting)
Single-wire S2Cwire Control
• Built-in Thermal Protection
• Automatic Soft Start
• -40°C to +85°C Temperature Range
• TSOPJW-12 and TDFN33-12 Packages
Applications
• Cellular and Smart Phones
• Digital Still and Video Cameras
• PDAs
• Portable Devices
• Portable Media Players
• Other White LED Backlighting
Typical Application
C1
1μF
VBATTERY
3.6V
CIN
1μF
EN/SET
S2Cwire Serial Control
C1+ C2+
C1- C2-
IN OUT
AAT3340
EN/SET
BL1
BL2
BL3
BL4
GND
C2
1μF
D1 D2 D3 D4
COUT
1μF
3340.2008.07.1.1
www.analogictech.com
1




Advanced Analogic Technologies

AAT3340 Datasheet Preview

AAT3340 Datasheet

High Efficiency 1x/1.5x Charge Pump

No Preview Available !

www.DataSheet4U.com
ChargePumpTM
PRODUCT DATASHEET
AAT3340
High Efficiency 1x/1.5x Charge Pump
Pin Description
Pin Number
TDFN33-12
1
2
3
TSOPJW-12
12
11
10
Name
C1+
OUT
IN
Function
Flying capacitor 1 positive terminal. Connect a 1μF ceramic capacitor between C1+ and C1-.
Charge pump output to drive load circuit. Requires a 1μF or larger ceramic capacitor con-
nected between this pin and ground.
Input power supply. Requires a 1μF or larger ceramic capacitor connected between this pin
and ground.
4 9 C2+ Flying capacitor 2 positive terminal. Connect a 1μF ceramic capacitor between C2+ and C2-.
5 8 EN/SET AS2Cwire serial interface control pin.
6 7 BL1 Current sink input #1.
7 6 BL2 Current sink input #2.
8 5 BL3 Current sink input #3.
9 4 BL4 Current sink input #4.
10 3 C1- Flying capacitor 1 negative terminal.
11 2 GND Ground pin
12 1 C2- Flying capacitor 2 negative terminal.
EP n/a
Exposed paddle (bottom). Connect to GND directly beneath package.
Pin Configuration
TSOPJW-12
(Top View)
TDFN33-12
(Top View)
C2-
GND
C1-
BL4
BL3
BL2
1
2
3
4
5
6
12 C1+
11 OUT
10 IN
9 C2+
8 EN/SET
7 BL1
C1+ 1
OUT 2
IN 3
C2+ 4
EN/SET 5
BL1 6
12 C2-
11 GND
10 C1-
9 BL4
8 BL3
7 BL2
2
www.analogictech.com
3340.2008.07.1.1


Part Number AAT3340
Description High Efficiency 1x/1.5x Charge Pump
Maker Advanced Analogic Technologies
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