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器件描述：High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
器件厂商：ANALOGICTECH [Advanced Analogic Technologies]
厂商主页：http://www.analogictech.com/
文件大小：416.53KB
文件页数：14
PDF阅读：AAT3167.pdf (点击阅读器件资料)
摘要：
General Description
The AAT3167 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 AAT3167 is capable of
driving five LEDs for a total of 135mA from a 2.7V
to 5.5V input. The current sinks may be operated
individually or in parallel for driving higher current
LEDs. A low external parts count (two 1?F flying
capacitors and two small 1?F capacitors at IN and
OUTCP) make this part ideally suited for small,
battery-powered applications.
AnalogicTech's AS
2
Cwire? (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 115?A. For optimized efficiency,
low-current settings require only 50?A of house-
keeping current.
Each output of the AAT3167 is equipped with built-
in protection for output short circuit and auto-dis-
able for load short-circuit conditions. Built-in soft-
start circuitry prevents excessive inrush current
during start-up. A low-current shutdown feature dis-
connects the load from the input and reduces qui-
escent current to less than 1?A.
The AAT3167 is available in a Pb-free, space-sav-
ing, thermally-enhanced, 16-pin 3x4mm TDFN or
16-pin 4x4mm QFN package and is rated over the
-40°C to +85°C temperature range.
Features
?V
IN
Range: 2.7V to 5.5V
? Fully Programmable Current with Single Wire
— 16-Step Logarithmic Scale
— 14/18/27mA Max Current
— Four Low-Current Settings Down to 115?A
— Low I
Q
(50?A) for Single-Channel, Low-
Current Mode
? Tri-Mode 1X, 1.5X, 2X Charge Pump for
Maximum Efficiency and V
F
Coverage
? Drives Up to Five LEDs
? Individual Main-Sub (4-1) Group Control
? No Inductors, Low Noise Operation
? 1MHz Constant Switching Frequency
? Small Application Circuit
? Built-In Thermal Protection
? Built-In Auto-Disable for Open Circuit
? Automatic Soft Start
?I
Q
<1?A in Shutdown
? TDFN34-16 or QFN44-16 Package
Applications
? Color (RGB) Lighting
? Programmable Current Sink
? Transmissive LCD Display
? White LED Backlighting
? White Photo Flash for Digital Still Cameras
AAT3167
High Efficiency 1X/1.5X/2X Charge
Pump for White LED Applications
Typical Application
C1
1?F
C2
1?F
D1 D2 D3 D4 D5
C OU T
1?F
C IN
1?F
2.7V to 5.5V
EN/SET
IN
EN/SET
C1+
C1-
C2+
C2-
OUTCP
D1
D2
D3
D4
D5
GND
AAT3167
3167.2006.05.1.3 1
ChargePump
?
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