AAT3152 Pump Datasheet

AAT3152 Datasheet, PDF, Equivalent


Part Number

AAT3152

Description

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

Manufacture

Skyworks

Total Page 11 Pages
Datasheet
Download AAT3152 Datasheet


AAT3152
DATA SHEET
AAT3152
High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
General Description
The AAT3152 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
AAT3152 is capable of driving four-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.
A 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.
Skyworks’ 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/sub-display group control. The AAT3152 consumes
extremely low current internally (50µA typical) at light
load for optimized efficiency.
Each output of the AAT3152 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 AAT3152 is available in a Pb-free, space-saving,
thermally-enhanced 12-pin 3x3mm TDFN package.
Features
VIN Range: 2.7V to 5.5V
Fully Programmable Current with Single Wire
Eight-Step Current: 20mA to 50µA
Individual Main-Sub Group Control
Low IQ (50µA) at Light Load
Tri-Mode 1X, 1.5X, and 2X Charge Pump for Maximum
Efficiency and VF Coverage
Drives 1-4 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
Thermally-Enhanced 3x3mm 12-Pin TDFN Package
Applications
Color (RGB) Lighting
Programmable Current Sinks
White LED Backlighting
White Photo Flash for Digital Still Cameras
Typical Application
2.7V to 5.5V
VIN C1+
CIN
1µF C1-
C2+
AAT3152
C2-
VOUT
EN/SET
EN/SET
GND
D1
D2
D3
D4
C1
1µF
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
202149A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 10, 2012
1

AAT3152
DATA SHEET
AAT3152
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
EP
Symbol
D4
EN/SET
C1+
C1-
VOUT
C2+
C2-
VIN
GND
D1
D2
D3
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 #1.
Current sink input #2.
Current sink input #3.
Exposed paddle (bottom); connect to GND directly beneath package.
Pin Configuration
TDFN33-12
(Top View)
D4 1
EN/SET 2
C1+ 3
C1- 4
VOUT 5
C2+ 6
12 D3
11 D2
10 D1
9 GND
8 VIN
7 C2-
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
2 202149A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 10, 2012


Features DATA SHEET AAT3152 High Efficiency 1X/1. 5X/2X Charge Pump for White LED Applica tions General Description The AAT3152 is a low noise, constant frequency char ge pump DC/DC converter that uses a tri -mode load switch (1X), fractional (1.5 X), and doubling (2X) conversion to max imize efficiency for white LED applicat ions. The AAT3152 is capable of driving four-channel LEDs from a 2.7V to 5.5V input. The current sinks may be operate d individually or in parallel for drivi ng higher-current LEDs. A low external parts count (two 1µF flying capacitors and two small 1µF capacitors at VIN a nd VOUT) makes this part ideally suited for small, battery-powered application s. Skyworks’ S2Cwire™ (Simple Seria l Control) serial digital input is used to enable, disable, and set current fo r each LED with eight settings (20mA do wn to 50µA) including main/sub-display group control. The AAT3152 consumes ex tremely low current internally (50µA t ypical) at light load for optimized efficiency. Each output of .
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