BCT3144数据手册Broadchip中文资料规格书

描述 Description

The BCT3144 is a dual LED flash driver that provides a high level of adjustability within a small solution size. The BCT3144 utilizes a 2MHz or 4MHz fixed frequency synchronous boost converter to provide power to the dual 1.5A constant current LED sources. The total LED current the BCT3144 boost can deliver is 1.5A (ILED1+ ILED2). The dual 128 level current sources provide the flexibility to adjust the current ratios between LED1 and LED2 with each driver capable of delivering a maximum of 1.5A. An adaptive regulation met hod ensures the current sources remain in regulation and maximizes efficiency.

Features of the BCT3144 are controlled via an I2C comp atible 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, over voltage 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.

特性 Features

• 1.5A Total Allowed LED Current During Operation
• Dual Independent LED Current Source Programmability
• Accurate and Programmable LED Current Range from 2.92mA to 1.5A
• Optimized Flash LED Current During Low Battery Conditions (IVFM)
• 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)
• 400-kHz I2C-Compatible Interface-BCT3146(I2C Address=0x63)
• -40℃ to +85℃ Operating Temperature Range
• Available in Green WLCSP-12L Packages

应用 Application

• Camera Phone White LED Flash