Texas Instruments LM3643
The LM3643 is a dual LED flash driver that provides a high level of adjustability within a small solution size. The LM3643 utilizes a 2-MHz or 4-MHz fixedfrequency synchronous boost converter to provide power to the dual 1.5-A constant current LED sources. The total LED current the LM3643 boost can deliver is 1.5 A (ILED1 + ILED2 ).| Part No. | LM3643 |
|---|---|
| Datasheet | LM3643 Download |
| Manufacturer |  Texas Instruments |
| Description | Synchronous Boost Dual LED Flash Driver |
| Buy | Stock & Price |
FEATURES
●1 1.5 A Total Allowed LED Current During Operation (ILED1 + ILED2 = 1.5 A)● Dual Independent LED Current Source Programmability
● Accurate and Programmable LED Current Range from 1.4 mA to 1.5 A
● Optimized Flash LED Current During Low Battery Conditions (IVFM)
● > 85% Efficiency in Torch Mode (@ 100 mA) and Flash Mode (@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 – LM3643 (I2C Address = 0x63) – LM3643A (I2C Address = 0x67) 2
APPLICATIONS
Camera Phone White LED Flash 3DESCRIPTION
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 1.5 A (ex: ILED1 = 1.5 A and ILED2 = 0FF, ILED1 = 0FF and ILED2 = 1.5 A, or a current configuration with a current less than 1.5 A , ILED1 = 950 mA and ILED2 = 250 mA).
