AAT3158 Pump Datasheet

AAT3158 Datasheet, PDF, Equivalent


Part Number

AAT3158

Description

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

Manufacture

AAT

Total Page 11 Pages
Datasheet
Download AAT3158 Datasheet


AAT3158
AAT3158
High Efficiency 1X/1.5X/2X Charge Pump
for White LED Applications
General Description
Features
ChargePump
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 dou-
bling (2X) conversion to maximize efficiency for
white LED applications. The AAT3158 is capable of
driving up to four LED channels at 20mA per chan-
nel 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.
AnalogicTech's S2Cwire™ (Simple Serial
Control™) serial digital input is used to enable, dis-
able, and set current for each LED with 16 settings
down to 50µA. The low current mode supply cur-
rent can be as low as 50µA to save power.
• 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
Each output of the AAT3158 is equipped with built-
Applications
in protection for VOUT short circuit and auto disable
for load short-circuit conditions. Built-in soft-start
• Color (RGB) Lighting
circuitry prevents excessive inrush current during •www.DataSheet4U.com Programmable Current Sinks
start-up. A low current shutdown feature discon-
• White LED Backlighting
nects the load from VIN and reduces quiescent cur-
rent to less than 1µA.
• White Photo Flash for Digital Still Cameras
The AAT3158 is available in a Pb-free, space-saving
2.85x3.0mm TSOPJW-12 package.
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
3158.2006.02.1.0
1

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-
2 3158.2006.02.1.0


Features AAT3158 High Efficiency 1X/1.5X/2X Charg e Pump for White LED Applications Gener al Description The AAT3158 is a low noi se, constant frequency charge pump DC/D C converter that uses a trimode load sw itch (1X), fractional (1.5X), and doubl ing (2X) conversion to maximize efficie ncy for white LED applications. The AAT 3158 is capable of driving up to four L ED channels at 20mA per channel from a 2.7V to 5.5V input. The current sinks m ay be operated individually or in paral lel for driving higher current LEDs. A low external parts count (two 1µF flyi ng capacitors and two small 1µF capaci tors at VIN and VOUT) make this part id eally suited for small, battery-powered applications. AnalogicTech's S2Cwire (Simple Serial Control™) serial dig ital input is used to enable, disable, and set current for each LED with 16 se ttings down to 50µA. The low current m ode supply current can be as low as 50 A to save power. Features • • • • • • • • • • • • ChargePump™ VIN Range: 2.7V to 5.5V Fully Programmable C.
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