Datasheet AL3644 (Diodes)

AL3644 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 Dual Independent 1.5A LED Current Source Programmability adjustability within a small solution size. The AL3644 utilizes a 2MHz Accurate and Programmable LED Current Range from 1.4mA to or 4MHz fixed frequency synchronous boost converter to provide 1.5A power to the dual 1.5A constant current LED sources. The dual 128 Torch Currents up to 360mA (AL3644TT) level current sources provide the flexibility to adjust the current ratios Flash Timeout Values up to 1.6 seconds (AL3644TT) between LED1 and LED2. An adaptive regulation method ensures the Optimized Flash LED Current During Low Battery Conditions current sources remain in regulation and maximizes efficiency. (Input Voltage Flash Monitor)
T
> 85% Efficiency in Torch Mode (at 100mA) and Flash Mode (at
C
Features of the AL3644 are controlled via an I2C-compatible 1A to 1.5A)
U
interface. These features include: hardware flash and hardware torch Grounded Cathode LED Operation for Improved Thermal
D
pins (STROBE and TORCH/TEMP), a TX interrupt, and an NTC Management
O
thermistor monitor. The device offers independently programmable Small Solution Size: < 16mm2
R P
currents in each output leg to drive the LEDs in a Flash or Movie Hardware Strobe Enable (STROBE) Mode (Torch) condition. Synchronization Input for RF Power Amplifier Pulse Events (TX)
W
Hardware Torch Enable (TORCH/TEMP)
E
The 2MHz or 4MHz switching frequency options, overvoltage Remote NTC Monitoring (TORCH/TEMP)
N
protection (OVP), and adjustable current limit allow for the use of tiny, 400kHz I2C-Compatible Interface low-profile inductors and (10µF) ceramic capacitors. The device – AL3644 (I2C Address = 0x63) operates over a –40°C to +85°C ambient temperature range.
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. “Green” Device (Note 3) Applications
Camera Phone White LED Flash Notes: 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 <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and <1000ppm antimony compounds.
Pin Assignments Top View
A1 A2 A3 Pin A1 B1 B2 B3 C1 C2 C3 D1 D2 D3
U-WLB1713-12
AL3644 1 of 23 July 2019 Document number: DS41558 Rev. 1 - 2
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