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AAT3351 Datasheet

High Efficiency 1x/1.5x Charge Pump

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ChargePumpTM
General Description
The AAT3351 is a low-noise, constant-frequency charge
pump DC/DC converter that uses a dual-mode load
switch (1x) and fractional (1.5x) charge pump to maxi-
mize efficiency for white LED applications. AAT3351 is
capable of driving 4 white LEDs at a total of 120mA from
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 AAT3351 ideal for small battery-powered
applications.
Analogic Tech’s S2Cwire™ serial digital input is used to
enable, disable, and set current to one of 32 levels for
the LEDs.
The AAT3351 is equipped with built-in short-circuit pro-
tection. The soft-start circuitry prevents excessive inrush
current at start-up and mode transitions. The AAT3351
family is available in Pb-free, space-saving TSOPJW and
TDFN33 packages, and operates over the -40°C to
+85°C ambient temperature range.
PRODUCT DATASHEET
AAT3351
High Efficiency 1x/1.5x Charge Pump
Features
• Drives up to 4 LEDs at up to 30mA, each
• Automatic Switching Between 1x and 1.5x Modes
• 1MHz Switching Frequency
• Linear LED Output Current Control
Single-wire, S2Cwire Interface
32-step
• ±10% LED Output Current Accuracy
• 3% LED Output Current Matching
• Low-Current Shutdown Mode
• Automatic Soft-Start
• 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
C IN
1µF
EN/SET
S2Cwire Serial Control
C1+ C2+
C1- C2-
IN OUT
AAT3351
EN/SET
D1
D2
D3
D4
GND
C2
1µF
D1 D2 D3 D4
C OUT
1µF
3351.2009.02.1.0
www.analogictech.com
1


ANADIGICS Electronic Components Datasheet

AAT3351 Datasheet

High Efficiency 1x/1.5x Charge Pump

No Preview Available !

www.DataSheet4U.com
ChargePumpTM
PRODUCT DATASHEET
AAT3351
High Efficiency 1x/1.5x Charge Pump
Pin Descriptions
Pin Number
TDFN33-12 TSOPJW-12
1 12
2 11
3 10
49
58
67
76
85
94
10 3
11 2
12 1
EP N/A
Name
D4
EN/SET
C2-
C2+
OUT
C1-
C1+
IN
GND
D1
D2
D3
EP
Function
Backlight LED 4 current sink. D4 controls the current through backlight LED 4.
Connect the cathode of backlight LED 4 to D4. If not used, connect D4 to OUT.
S2Cwire serial interface control pin.
Negative terminal of charge pump capacitor 2.
Positive terminal of charge pump capacitor 2. Connect the 1μF charge pump
capacitor 2 from C2+ to C2-.
Charge pump output. OUT is the output of the charge pump and supplies current
to the backlight LEDs. Connect the backlight LED anodes to OUT. Bypass OUT to
PGND with a 1μF or larger ceramic capacitor as close to the AAT3351 as possible.
Negative terminal of charge pump capacitor 1.
Positive terminal of charge pump capacitor 1. Connect the 1μF charge pump
capacitor 1 from C1+ to C1-.
Power input. Connect IN to the input source voltage. Bypass IN to GND with a 1μF
or larger ceramic capacitor as close to the AAT3351 as possible.
Ground pin.
Backlight LED 1 current sink. D1 controls the current through backlight LED 1.
Connect the cathode of backlight LED 1 to D1. If not used, connect D1 to OUT.
Backlight LED 2 current sink. D2 controls the current through backlight LED 2.
Connect the cathode of backlight LED 2 to D2. If not used, connect D2 to OUT.
Backlight LED 3 current sink. D3 controls the current through backlight LED 3.
Connect the cathode of backlight LED 3 to D3. If not used, connect D3 to OUT.
Exposed paddle (bottom). Connect to GND directly beneath package.
Pin Configuration
TSOPJW-12
(Top View)
TDFN33-12
(Top View)
D3
D2
D1
GND
IN
C1+
1
2
3
4
5
6
12 D4
11 EN/SET
10 C2-
9 C2+
8 OUT
7 C1-
D4 1
EN/SET 2
C2- 3
C2+ 4
OUT 5
C1- 6
12 D3
11 D2
10 D1
9 GND
8 IN
7 C1+
2
www.analogictech.com
3351.2009.02.1.0


Part Number AAT3351
Description High Efficiency 1x/1.5x Charge Pump
Maker Anadigics
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