AAT1282 Datasheet PDF - Skyworks Solutions
| Part Number | AAT1282 | |
| Description | 2A Driver for High Intensity LED Camera Flash | |
| Manufacturers | Skyworks Solutions | |
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DATA SHEET
AAT1282
2A Driver for High Intensity LED Camera Flash
General Description
The AAT1282 is a high-efficiency, high-current step-up
converter capable of 2A maximum output current. It is
an ideal power solution for LED photo flash applications
in all single cell Li-ion powered products.
The AAT1282 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 inductor
and output capacitor, making the AAT1282 ideally suited
for small battery-powered applications. A high-capacity
Super Capacitor on the secondary side of the step-up
converter provides the high-peak flash LED current,
thereby reducing the peak current demand from the
Li-ion battery. To achieve this, the step-up converter
features a fixed, input current limiter.
An industry-standard I2C serial digital input is used to
enable, disable and set the movie-mode current for each
flash LED with up to 16 movie-mode settings. The
AAT1282 also includes a separate Flash Enable input to
initiate both the flash operation and the default timer
which can be used either to terminate a flash event at the
end of a user-programmed delay or as a safety feature.
The maximum flash and movie-mode current is set by
one external resistor where the ratio between Flash to
Movie-mode current is set at approximately 7.3:1. One or
two LEDs can be connected to the AAT1282, where in the
case of two LEDs the output current is matched between
each diode. The ratio of maximum flash current to movie-
mode current can also be adjusted via the I2C control.
The AAT1282 contains a thermal management system to
protect the device in the event of an output short-circuit
condition. Built-in circuitry prevents excessive inrush
current during start-up. The shutdown feature reduces
quiescent current to less than 1.0μA.
The AAT1282 is available in a Pb-free, thermally-
enhanced 14-pin 3 x 3mm TDFN package.
Features
VIN Range: 2.7V to 5.5V
Dual Channel Output
▪ Up to 2A Regulated Output Current
1A per channel
Integrated Fixed Input Current Limit
▪ 800mA*
▪ Suited for Super Capacitor Applications
Up to 80% Efficiency with Small Magnetics
2MHz Switching Frequency
Independent Flash Enable
User-programmable Safety Timer
Single Resistor Sets Flash and Movie-mode Current
Two Wire, I2C Compliant Serial Interface:
▪ Fast, 400kHz Serial Transfer Rate
▪ 16 level Movie-mode Current
▪ Flash/Movie-mode
▪ Current Output Channel Control
▪ Safety Timer
• True Load Disconnect
• Supply Current in Shutdown: <1.0μA
• TDFN33-14 Package
Applications
• Camcorder Video Light (Torch Light)
• Camera Phones/Smartphones
• Digital Still Cameras (DSC)
• LED Photo Flash Light (Strobe Light)
• Mobile Handsets
* Contact Sales for alternative current limits.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202305C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 20, 2013
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I2C Interface Timing Details
DATA SHEET
AAT1282
2A Driver for High Intensity LED Camera Flash
SDA
SCL
TLOW
TSU_DAT
THD_STA
THD_DAT
THIGH
TSU_STA
THD_STA
TSU_STO
TBUF
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202305C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 20, 2013
5
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for AAT1282 electronic component. |
| Information | Total 22 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ AAT1282.PDF Datasheet ] | |
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