Datasheet Diodes AL3644


Dual 1.5A Current Source Camera Flash LED Driver


Datasheet AL3644
PDF, 805 Kb, Language: en, File uploaded: Oct 24, 2019, Pages: 23
Dual 1.5A Current Source Camera Flash LED Driver


Detailed Description

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.




Parameters / ModelsAL3644CH12-7AL3644TTCH12-7
Efficiency (%)8585
Maximum Input Voltage (V)55
Maximum Output Current per Channel15001500
Minimum Input Voltage (V)2.52.5
Number of Regulated Output Channels22
Operating Temperature Range, °C-40 to 125-40 to 125
Quiescent Current (mA)0.30.3
SW RDS(ON) (?)6565
Soft StartYesYes
Standby Quiescent Current (?A)2.52.5
Switching Frequency (MHz)44

Model Line

Series: AL3644 (2)

Manufacturer's Classification