Texas Instruments LM3648
The LM3648 is an LED flash driver that provides a high level of adjustability within a small solution size. The LM3648 utilizes a 2-MHz or 4-MHz fixedfrequency synchronous boost converter to provide power to the 1.5-A constant current LED source. These features include: hardware flash and hardware torch pins (STROBE and TORCH/TEMP), a TX interrupt, and an NTC thermistor monitor.| Part No. | LM3648 |
|---|---|
| Datasheet | LM3648 Download |
| Manufacturer |  Texas Instruments |
| Description | Synchronous Boost LED Flash Driver |
| Buy | Stock & Price |
FEATURES
●1 1.5-A LED Current Source Programmability● Accurate and Programmable LED Current Range from 1.954 mA to 1.5 A
● Torch Currents up to 500 mA (LM3648TT)
● Flash Timeout Values up to 1.6 Seconds (LM3648TT)
● Optimized Flash LED Current During Low Battery Conditions (IVFM)
● > 85% Efficiency in Torch Mode (at 100 mA) and Flash Mode (at 1 A to 1.5 A)
● Grounded Cathode LED Operation for Improved Thermal Management
● Small Solution Size: < 16 mm2
● Hardware Strobe Enable (STROBE)
● Synchronization Input for RF Power Amplifier Pulse Events (TX)
● Hardware Torch Enable (TORCH/TEMP)
● Remote NTC Monitoring (TORCH/TEMP)
● 400-kHz I2C-Compatible Interface – LM3648 (I2C Address = 0x63) 2
APPLICATIONS
● Camera Phone White-LED Flash● Digital Still Cameras
● Fire-Alarm Notification
● Emergency Strobe Lighting
● Intruder Alert Notification
● Barcode Scanners
● Handheld Data Terminals 3
DESCRIPTION
An adaptive regulation method ensures the current source remains in regulation and maximizes efficiency.
