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PDF AAT3158 Data sheet ( Hoja de datos )
| Número de pieza | AAT3158 | |
| Descripción | High Efficiency 1X/1.5X/2X Charge Pump | |
| Fabricantes | AAT | |
| Logotipo |  |
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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
1 page  
AAT3158
High Efficiency 1X/1.5X/2X Charge Pump
for White LED Applications
Typical Characteristics
Efficiency vs. Supply Voltage
100
90 6mA/ch
VF = 3V
80
20mA/ch
VF = 3.4V
70
60
50
500µA/ch
40 VF = 2.7V
30
2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5
Supply Voltage (V)
EN/SET
(2V/div)
VOUT
(2V/div)
VSINK
(1V/div)
IIN
(100mA/div)
Turn-On to 1X Mode
(VIN = 4.2V; 20mA/ch Load)
Time (100µs/div)
EN/SET
(2V/div)
VOUT
(2V/div)
VSINK
(1V/div)
IIN
(200mA/div)
Turn-On to 1.5X Mode
(VIN = 3.5V; 20mA/ch Load)
Time (100µs/div)
EN/SET
(2V/div)
VOUT
(2V/div)
VSINK
(500mV/div)
IIN
(500mA/div)
Turn-On to 2X Mode
(VIN = 2.8V; 20mA/ch Load)
Time (100µs/div)
EN/SET
(2V/div)
VF
(1V/div)
IIN
(100mA/div)
Turn-Off from 1.5X Mode
(VIN = 3.5V; 20mA/ch Load)
Time (100µs/div)
22.0
21.5
21.0
20.5
20.0
19.5
19.0
18.5
18.0
-40
Diode Current vs. Temperature
(20mA/channel)
ID1
ID4
ID2
ID3
-25 -10 5
20 35 50 65 80
Temperature (°C)
95
3158.2006.02.1.0
5
5 Page 
AAT3158
High Efficiency 1X/1.5X/2X Charge Pump
for White LED Applications
Ordering Information
Package
TSOPJW-12
Marking1
RHXYY
Part Number (Tape and Reel)2
AAT3158ITP-T1
All AnalogicTech products are offered in Pb-free packaging. The term “Pb-free” means
semiconductor products that are in compliance with current RoHS standards, including
the requirement that lead not exceed 0.1% by weight in homogeneous materials. For more
information, please visit our website at http://www.analogictech.com/pbfree.
Package Information
TSOPJW-12
0.20
+
-
0.10
0.05
0.50 BSC 0.50 BSC 0.50 BSC 0.50 BSC 0.50 BSC
3.00 ± 0.10
7° NOM
0.04 REF
All dimensions in millimeters.
0.055 ± 0.045
0.010
4° ± 4°
2.75 ± 0.25
0.45 ± 0.15
1. XYY = assembly and date code.
2. Sample stock is generally held on part numbers listed in BOLD.
© Advanced Analogic Technologies, Inc.
AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech product. No circuit patent licenses, copyrights, mask work rights,
or other intellectual property rights are implied. AnalogicTech reserves the right to make changes to their products or specifications or to discontinue any product or service without notice.
Customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold
subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. AnalogicTech
warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with AnalogicTech’s standard warranty. Testing and other quality con-
trol techniques are utilized to the extent AnalogicTech deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed.
Advanced Analogic Technologies, Inc.
830 E. Arques Avenue, Sunnyvale, CA 94085
Phone (408) 737-4600
Fax (408) 737-4611
3158.2006.02.1.0
11
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet AAT3158.PDF ] | |
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