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AAT3142ITP-T1 参数 Datasheet PDF下载

AAT3142ITP-T1图片预览
型号: AAT3142ITP-T1
PDF下载: 下载PDF文件 查看货源
内容描述: 高效率1X / 1.5X / 2X电荷泵白光LED应用 [High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications]
分类和应用:
文件页数/大小: 16 页 / 477 K
品牌: AAT [ ADVANCED ANALOG TECHNOLOGY, INC. ]
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AAT3142
High Efficiency 1X/1.5X/2X Charge Pump
for White LED Applications
General Description
The AAT3142 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 device produces cur-
rent levels up to 30mA on each of its three current
source outputs to drive various arrangements of
LEDs from a 2.7V to 5.5V input. Outputs may be
operated individually or in parallel for driving high-
er-current LEDs. A low external parts count (two
1µF flying capacitors and two small 1µF capacitors
at V
IN
and CP) make the AAT3142 ideally suited for
small battery-powered applications.
AnalogicTech's Simple Serial Control™ (S
2
Cwire™)
digital input is used to enable, disable, and set the
LED drive current with a 32-level logarithmic scale
LED brightness control. The AAT3142 has a thermal
management system to protect the device in the
event of a short-circuit condition at an output pin.
Built-in soft-start circuitry prevents excessive inrush
current during start-up. A high charge pump switch-
ing frequency enables the use of very small external
capacitors. In shutdown mode, the device discon-
nects the load from V
IN
and reduces quiescent cur-
rent to less than 1µA. The AAT3142 is available in
the very small, Pb-free 12-pin TSOPJW package.
Features
ChargePump
V
IN
Range: 2.7V to 5.5V
Tri-Mode 1X, 1.5X, and 2X Charge Pump for
Maximum Efficiency and V
F
Coverage
Drives Low-V
F
and High-V
F
Type LEDs
Up to Three 30mA Outputs
32-Position Logarithmic Scale with Digital
Control
Low Noise Constant Frequency Operation
1MHz Switching Frequency
Small Application Circuit
Regulated Output Current
Automatic Soft Start
No Inductors
I
Q
< 1µA in Shutdown
12-Pin TSOPJW Package
Applications
Color (RGB) Lighting
Programmable Current Sources
White LED Backlighting
White Photo Flash for Digital Still Cameras
Typical Application
VIN
C1+
C1
1μF
CP
V
BATTERY
C
IN
1μF
C
CP
1μF
C1-
C2+
C2
1μF
AAT3142
C2-
D1
D2
D3
EN/SET
EN/SET
D3
GND
D2
D1
3142.2007.03.1.2
1