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參數(shù)資料
| 型號： | AAT1270IFO-T1 |
| 廠商： | Advanced Analogic Technologies, Inc. |
| 英文描述： | 1A Step-Up Current Regulator for Flash LEDs |
| 中文描述： | 第1A升壓電流調(diào)節(jié)器的閃光燈發(fā)光二極管 |
| 文件頁數(shù)： | 1/18頁 |
| 文件大小： | 734K |
| 代理商： | AAT1270IFO-T1 |
AAT1270
1A Step-Up Current Regulator for Flash LEDs
1270.2007.07.1.0
1
SwitchReg
Typical Application
AAT1270
R
SET
162k
Ω
V
BATTERY
IN
2C
T
C
L1
1μH
IN
SW
OUT
FLOUTA
CT
EN/SET
FLINH
RSET
AGND PGND
FLEN
EnMovie Mode
Flash Enable
Flash Inhibit
FLOUTB
FLGND
OUT
C
GND
Lumiled LXFlash LEDs
General Description
The AAT1270 is a high-efficiency, high-current boost
converter capable of 1A maximum output current. It
is an ideal power solution for LED photo flash appli-
cations in all single-cell Lithium-ion / polymer battery
operated products.
The AAT1270 maintains output current regulation by
switching the internal high-side and low-side switch
transistors. The transistor switches are pulse-width
modulated at a fixed frequency of 2MHz. The high
switching frequency allows the use of a small induc-
tor and output capacitor, making the AAT1270 ideal-
ly suited for small battery-powered applications.
AnalogicTech’s proprietary S
2
Cwire
(Simple Serial
Control
) serial digital interface is used to enable,
disable and set the movie mode current level for the
flash LEDs to one of 16 levels. The AAT1270 also
includes a separate Flash Enable input to initiate both
flash/strobe operation and the default timer, which
can be used to terminate a flash event after a user-
programmed delay or as a safety feature. A Flash
Inhibit pin is also included which reduces flash cur-
rent to movie mode level during high battery demand.
The maximum flash and movie mode current is set
by one external resistor; the ratio between flash and
movie mode current is set at approximately 7.3:1.
One or two LEDs can be connected to the AAT1270;
when two LEDs are used, the output current is
matched between each diode.
The AAT1270 contains over-voltage protection and a
thermal management system to protect the device in
the event of an output open-circuit and short-circuit
condition respectively. Built-in circuitry prevents exces-
sive inrush current during start-up. The shutdown fea-
ture reduces quiescent current to less than 1.0μA.
The AAT1270 is available in a Pb-free, thermally-
enhanced 14-pin 3x3mm STDFN package.
Features
Input Voltage Range: 2.7V to 5.5V
Dual Channel Output
— Up to 1A Regulated Output Current
(0.5A per Channel)
Up to 85% Efficiency with Small Magnetics
2 MHz Switching Frequency
Separate Flash Enable Input
Separate Flash Inhibit Input
Single Resistor Sets Flash and Movie Mode Current
— Fixed Flash-to-Movie Mode Current Ratio
16-Level Movie Mode Current via S
2
Cwire
User-Programmable Safety Timer
True Load Disconnect
Input Current Limit
Over-Voltage (Open LED, Open Circuit), Short-
Circuit, and Over-Temperature Protection
Shutdown Current: < 1.0μA
Small Inductor Solution: 1μH (0.9mm in height)
14-pin STDFN 3x3 Package
-40 to +85°C Temperature Range
Applications
Camcorder Video Light (Torch Light)
Cellphones / Smartphones
Digital Still Cameras (DSC)
LED Photo Flash Light (Strobe Light)
Mobile Handsets
MP3 Players
PDAs and Notebook PCs
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AAT1271 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:1.5A Step-Up Current Regulator for Flash LEDs |
| AAT1271A | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:1.5A Step-Up Current Regulator for Flash LEDs |
| AAT1271AIWO-T1 | 制造商:Skyworks Solutions Inc 功能描述:DC TO DC CONVERTER |
| AAT1271IWO-T1 | 制造商:Skyworks Solutions Inc 功能描述:DC TO DC CONVERTER |
| AAT1272IWO-T1 | 制造商:Skyworks Solutions Inc 功能描述:IC LED DRIVER FLASH 14TDFN 制造商:Skyworks Solutions Inc 功能描述:DC TO DC CONVERTER 制造商:Skyworks 功能描述:1.5A Step-Up Current Regulator for Flash LEDs |
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