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
1A to 1.5A)
Grounded Cathode LED Operation for Improved Thermal
Management
Small Solution Size: < 16mm2
Hardware Strobe Enable (STROBE)
Synchronization Input for RF Power Amplifier Pulse Events (TX)
Hardware Torch Enable (TORCH/TEMP)
Remote NTC Monitoring (TORCH/TEMP)
400kHz I2C-Compatible Interface
– AL3644 (I2C Address = 0x63)
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Applications
Notes:
Camera Phone White LED Flash
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant.
2. See https://www.diodes.com/quality/lead-free/ for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and
Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain
很抱歉,暂时无法提供与“AL3644CH12-7”相匹配的价格&库存,您可以联系我们找货
免费人工找货- 国内价格 香港价格
- 1+5.795611+0.70105
- 10+5.0737610+0.61373
- 25+4.7644525+0.57632
- 100+3.88898100+0.47042
- 250+3.61252250+0.43698
- 500+3.07434500+0.37188
- 1000+2.459581000+0.29752
- 国内价格
- 1+3.26106
- 10+2.75076
- 30+2.47374
- 100+2.05578