Datasheet Diodes AL3644CH12-7 — 数据表

AL3644 NEW PRODUCT DUAL 1.5A CURRENT SOURCE CAMERA FLASH LED DRIVER Description Features The AL3644 is a dual LED flash driver that provides a high level of
adjustability within a small solution size. The AL3644 utilizes a 2MHz
or 4MHz fixed frequency synchronous boost converter to provide
power to the dual 1.5A constant current LED sources. The dual 128
level current sources provide the flexibility to adjust the current ratios
between LED1 and LED2. An adaptive regulation method ensures the
current sources remain in regulation and maximizes efficiency. Features of the AL3644 are controlled via an I2C-compatible
interface. These features include: hardware flash and hardware torch
pins (STROBE and TORCH/TEMP), a TX interrupt, and an NTC
thermistor monitor. The device offers independently programmable
currents in each output leg to drive the LEDs in a Flash or Movie
Mode (Torch) condition.
The 2MHz or 4MHz switching frequency options, overvoltage
protection (OVP), and adjustable current limit allow for the use of tiny,
low-profile inductors and (10µF) ceramic capacitors. The device
operates over a –40°C to +85°C ambient temperature range. Dual Independent 1.5A LED Current Source Programmability
Accurate and Programmable LED Current Range from 1.4mA to
1.5A
Torch Currents up to 360mA (AL3644TT)
Flash Timeout Values up to 1.6 seconds (AL3644TT)
Optimized Flash LED Current During Low Battery Conditions
(Input Voltage Flash Monitor)
> 85% Efficiency in Torch Mode (at 100mA) and Flash Mode (at …