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PDF AAT3152 Data sheet ( Hoja de datos )
| Número de pieza | AAT3152 | |
| Descripción | High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications | |
| Fabricantes | Advanced Analogic Technologies | |
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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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1 page  
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AAT3152
High Efficiency 1X/1.5X/2X Charge Pump
For White LED Applications
Typical Characteristics
Efficiency vs. Supply Voltage
100
10mA
20mA
90
80
70
60
50
2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2
Supply Voltage (V)
EN
(2V/div)
CP
(2V/div)
VSINK
(500mV/div)
IIN
(200mA/div)
Turn On to 1X Mode
(VIN = 4.2V; 20mA Load)
200µs/div
EN
(2V/div)
CP
(2V/div)
VSINK
(500mV/div)
IIN
(200mA/div)
Turn On to 1.5X Mode
(VIN = 3.5V; 20mA Load)
Turn On to 2X Mode
(VIN = 2.8V; 20mA Load)
EN
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(2V/div)
VSINK
(500mV/div)
IIN
(200mA/div)
200µs/div
200µs/div
EN
(2V/div)
VF
(1V/div)
IIN
(100mA/div)
Turn Off from 1.5X Mode
(VIN = 3.5V; 20mA Load)
200µs/div
3152.2004.12.0.9
5
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| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet AAT3152.PDF ] | |
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