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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：421.69KB
文件页数：14
PDF阅读：AAT3169ISN-T1.pdf (点击阅读器件资料)
摘要：
General Description
The AAT3169 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 AAT3169 is capable of driv-
ing six LEDs for a total of 180mA from a 2.7V to
5.5V input. The current sinks may be operated indi-
vidually 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 VIN and VOUT)
make this part ideally suited for small, battery-pow-
ered 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 65?A of house-
keeping current.
Each output of the AAT3169 is equipped with built-
in protection for V
OUT
short-circuit and auto-disable
for load short-circuit conditions. Built-in soft-start
circuitry prevents excessive inrush current during
start-up. A low-current shutdown feature discon-
nects the load from V
IN
and reduces quiescent cur-
rent to less than 1?A.
The AAT3169 is available in a Pb-free, space-sav-
ing, thermally-enhanced 16-pin 3x4mm TDFN or
4x4mm QFN package.
Features
?V
IN
Range: 2.7V to 5.5V
? Fully Programmable Current with Single Wire
— 16-Step Logarithmic Scale
— 20/30/15mA Max Current
— Four Low-Current Settings Down to 115?A
— Low I
Q
(65?A) for Single-Channel, Low-
Current Mode
? Tri-Mode 1X, 1.5X, and 2X Charge Pump for
Maximum Efficiency and V
F
Coverage
? Drives Up to Six LEDs
? Individual Main-Sub (5-1) 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
? Thermally-Enhanced TDFN34-16 or
QFN44-16 Package
Applications
? Color (RGB) Lighting
? Programmable Current Sink
? White LED Backlighting
? White Photo Flash for Digital Still Cameras
AAT3169
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
OUT
1 ? F
C
IN
1 ? F
2.7V to 5.5V
EN/SET
VIN
EN/SET
C1+
C1-
C2+
C2-
VOUT
D1
D2
D3
D4
D5
GND
AAT3169
D6
D6
3169.2006.04.1.0 1
ChargePump
?
相关器件：AAT3169
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