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大电流高亮发光二极管驱动器AAT1270-1A


介绍

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 S2
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.

特性

• 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 S2
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

生产厂商:ANALOGIC TECH

datasheet:
AAT1270.pdf
下载: pdf 文件

 


 
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