AAT3152 Applications Datasheet

AAT3152 Datasheet, PDF, Equivalent


Part Number

AAT3152

Description

High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications

Manufacture

Advanced Analogic Technologies

Total Page 10 Pages
Datasheet
Download AAT3152 Datasheet


AAT3152
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AAT3152
High Efficiency 1X/1.5X/2X Charge Pump
For White LED Applications
General Description
Features
ChargePump
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 par-
allel for driving higher-current LEDs. Low external
parts count (two 1µF flying capacitors and two small
1µF capacitors at VIN and VOUT) makes this part ide-
ally suited for small battery-powered applications.
AnalogicTech's 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 cur-
rent internally (80µA typical) at light load for opti-
mized efficiency.
• 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 (80µA) 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
• Thermal-Enhanced 3x3mm12-Pin DFN
Package
Each output of the AAT3152 is equipped with built-
in protection for VOUT short circuit and auto-disable
for load short-circuit condition. Built-in soft-start cir-
www.DataSheet4U.comcuitry prevents excessive inrush current during
start-up. A low current shutdown feature discon-
nects the load from VIN and reduces quiescent cur-
rent to less than 1µA.
Applications
• Color (RGB) Lighting
• Programmable Current Sinks
• White LED Backlighting
• White Photo Flash for DSCs
The AAT3152 is available in a space-saving, ther-
mal-enhanced 12-pin 3x3mm DFN package.
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
3152.2004.12.0.9
1
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AAT3152
www.DataSheet4U.com
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 Function
D4 Current sink input #4.
EN/SET S2Cwire serial interface control pin.
C1+ Flying capacitor 1 + terminal. Connect a 1µF capacitor between C1+ and C1-.
C1- Flying capacitor 1 - terminal.
OUTCP
Charge pump output to drive load circuit. Requires 1µF capacitor connected
between this pin and ground.
C2+ Flying capacitor 2 + terminal. Connect a 1µF capacitor between C2+ and C2-.
C2- Flying capacitor 2 - terminal.
IN Input power supply. Requires 1µF capacitor connected between this pin and
ground.
GND
Ground.
D1 Current sink input #1.
D2 Current sink input #2.
D3 Current sink input #3.
www.DataSheet4U.comExposed paddle (bottom); connect to GND directly beneath package.
Pin Configuration
DFN33-12
(TopView)
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-
2 3152.2004.12.0.9
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Features www.DataSheet4U.com AAT3152 High Effici ency 1X/1.5X/2X Charge Pump For White L ED Applications General Description The AAT3152 is a low noise, constant frequ ency charge pump DC/DC converter that u ses a tri-mode load switch (1X), fracti onal (1.5X), and doubling (2X) conversi on to maximize efficiency for white LED applications. The AAT3152 is capable o f driving four-channel LEDs from a 2.7V to 5.5V input. The current sinks may b e operated individually or in parallel for driving higher-current LEDs. Low ex ternal parts count (two 1µF flying cap acitors and two small 1µF capacitors a t VIN and VOUT) makes this part ideally suited for small battery-powered appli cations. AnalogicTech's S2Cwire™ (Sim ple Serial Control™) serial digital i nput is used to enable, disable, and se t current for each LED with eight setti ngs (20mA down to 50µA) including main /sub-display group control. The AAT3152 consumes extremely low current interna lly (80µA typical) at light load for optimized efficiency. Each output.
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