LM3648 Datasheet | Texas Instruments

Features - 1 1.5-A LED Current Source Programmability - Accurate and Programmable LED Current Range from 1.954 m A to 1.5 A - Torch Currents up to 500 m A (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 m A) 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-k Hz I2C-patible 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 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. An adaptive regulation method ensures the current source remains in regulation and maximizes efficiency. Features of the LM3648 are controlled via an I2Cpatible 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 64 programmable currents in Flash and 128 levels in Movie Mode (Torch) condition. The 2-MHz or 4-MHz switching frequency options, overvoltage protection (OVP), and adjustable current limit allow for the use of tiny, low-profile inductors and (10-µF) ceramic capacitors. The device operates over a - 40°C to +85°C ambient temperature range. Device Information(1) PART NUMBER PACKAGE BODY SIZE (MAX) DSBGA (12) 1.69 mm × 1.31 mm (1) For all available packages, see the orderable addendum at the end of the...