AAT3158 Pump Datasheet

AAT3158 Datasheet, PDF, Equivalent


Part Number

AAT3158

Description

High Efficiency 1X/1.5X/2X Charge Pump

Manufacture

Skyworks

Total Page 11 Pages
Datasheet
Download AAT3158 Datasheet


AAT3158
DATA SHEET
AAT3158
AAT3158 High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
General Description
The AAT3158 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
AAT3158 is capable of driving up to four LED channels at
20mA per channel from a 2.7V to 5.5V input. The current
sinks may be operated individually or in parallel for driv-
ing higher 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.
Skyworks' 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 AAT3158 is equipped with built-in
protection for VOUT short circuit and auto disable for load
short-circuit conditions. Built-in soft-start circuitry pre-
vents excessive inrush current during start-up. A low
current shutdown feature disconnects the load from VIN
and reduces quiescent current to less than 1µA.
The AAT3158 is available in a Pb-free, space-saving
2.85x3.0mm TSOPJW-12 package.
Features
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 LED Channels
No Inductors, Low Noise Operation
1MHz Constant Switching Frequency
Small Application Circuit
Built-In Thermal Protection
Automatic Soft-Start
IQ <1µA in Shutdown
2.85x3mm 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-
VIN VOUT
AAT3158
GND
EN/SET
D1
D2
D3
D4
C2
1µF
D1 D2 D3 D4
COUT
1µF
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202153A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 11, 2012
1

AAT3158
DATA SHEET
AAT3158
AAT3158 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
D4
EN/SET
C1+
C1-
VOUT
C2+
C2-
VIN
GND
D3
D2
D1
Function
Current sink input #4.
S2Cwire serial interface control pin.
Flying capacitor 1 positive terminal. Connect a 1µF capacitor between C1+ and C1-.
Flying capacitor 1 negative terminal.
Charge pump output to drive load circuit. Requires 1µF capacitor connected between this pin and ground.
Flying capacitor 2 positive terminal. Connect a 1µF capacitor between C2+ and C2-.
Flying capacitor 2 negative terminal.
Input power supply. Requires 1µF capacitor connected between this pin and ground.
Ground.
Current sink input #3.
Current sink input #2.
Current sink input #1.
Pin Configuration
TSOPJW-12
(Top View)
D4
EN/SET
C1+
C1-
VOUT
C2+
1
2
3
4
5
6
12 D1
11 D2
10 D3
9 GND
8 VIN
7 C2-
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
2 202153A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 11, 2012


Features DATA SHEET AAT3158 AAT3158 High Efficien cy 1X/1.5X/2X Charge Pump for White LED Applications General Description The AAT3158 is a low noise, constant freque ncy charge pump DC/DC converter that us es a tri-mode load switch (1X), fractio nal (1.5X), and doubling (2X) conversio n to maximize efficiency for white LED applications. The AAT3158 is capable of driving up to four LED channels at 20m A per channel from a 2.7V to 5.5V input . The current sinks may be operated ind ividually or in parallel for driving hi gher current LEDs. A low external parts count (two 1µF flying capacitors and two small 1µF capacitors at VIN and VO UT) make this part ideally suited for s mall, batterypowered applications. Skyw orks' S2Cwire™ (Simple Serial Control ) serial digital input is used to enabl e, disable, and set current for each LE D with 16 settings down to 50µA. The l ow current mode supply current can be a s low as 50µA to save power. Each outp ut of the AAT3158 is equipped with built-in protection for VOUT.
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