AAT3151B Pump Datasheet

AAT3151B Datasheet, PDF, Equivalent


Part Number

AAT3151B

Description

High Efficiency 1X/1.5X Charge Pump

Manufacture

Skyworks

Total Page 13 Pages
Datasheet
Download AAT3151B Datasheet


AAT3151B
DATA SHEET
AAT3151B
High Efficiency 1X/1.5X Charge Pump For White LED Applications
General Description
The AAT3151B 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 conver-
sion to maximize efficiency for white LED applications.
The AAT3151B is capable of driving four white LEDs at a
total of 120mA 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) makes the AAT3151B ideally suited for small
battery-powered applications.
Skyworks' AS2Cwire™ (Advanced Simple Serial Control™)
serial digital input is used to enable, disable, and set cur-
rent for each LED with a 16-level logarithmic scale plus
four low-current settings down to 50µA for optimized
efficiency, with a low housekeeping current of only 50µA.
The charge pump output of the AAT3151B is equipped
with built-in protection for VOUT. Each current sink input
has short-circuit and auto-disable to guard against LED
failure conditions. Built-in soft-start circuitry prevents
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 AAT3151B 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
16-Step Logarithmic Scale
15/20/30mA Max Current
Four Low-Current Settings Down to 50µA
Low IQ (50µA) for Low-Current Mode
• Dual Mode 1X and 1.5X Charge Pump for Maximum
Efficiency and VF Coverage
• Drives Four 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
• TDFN33-12 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+
AAT3151B
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
202144A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 6, 2012
1

AAT3151B
DATA SHEET
AAT3151B
High Efficiency 1X/1.5X 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.
AS2Cwire serial interface control pin.
Flying capacitor 1 positive terminal. Connect a 1µF ceramic capacitor between C1+ and C1-.
Flying capacitor 1 negative terminal.
Charge pump output to drive load circuit. Requires a 1µF or larger ceramic capacitor connected between
this pin and ground.
Flying capacitor 2 positive terminal. Connect a 1µF ceramic capacitor between C2+ and C2-.
Flying capacitor 2 negative terminal.
Input power supply. Requires a 1µF or larger ceramic 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 202144A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 6, 2012


Features DATA SHEET AAT3151B High Efficiency 1X/1 .5X Charge Pump For White LED Applicati ons General Description The AAT3151B i s a low noise, constant frequency charg e pump DC/DC converter that uses a dual mode load switch (1X) and fractional ( 1.5X) charge pump conversion to maximiz e efficiency for white LED applications . The AAT3151B is capable of driving fo ur white LEDs at a total of 120mA from a 2.7V to 5.5V input. The current sinks may be operated individually or in par allel for driving higher-current LEDs. A low external parts count (two 1µF fl ying capacitors and two small 1µF capa citors at VIN and VOUT) makes the AAT31 51B ideally suited for small battery-po wered applications. Skyworks' AS2Cwire (Advanced Simple Serial Control™) serial digital input is used to enable, disable, and set current for each LED with a 16-level logarithmic scale plus four low-current settings down to 50µA for optimized efficiency, with a low h ousekeeping current of only 50µA. The charge pump output of th.
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