LM3630A

Product Folder Sample & Buy Technical Documents Tools & Software Support & Community Reference Design LM3630A SNVS974B – APRIL 2013 – REVISED OCTOBER 2015 LM3630A High-Efficiency Dual-String White LED Driver 1 Features 1 Drives up to 2 Strings of 10 Series LEDs Wide 2.3-V to 5.5-V Input Voltage Range Up to 87% Efficient 8-bit I2C-Compatible Programmable Exponential or Linear Brightness Control PWM Brightness Control for CABC Operation Independent Current Control per String True Shutdown Isolation for LEDs Internal Soft-Start Limits Inrush Current Adaptive Headroom Programmable 16-V/24-V/32-V/40-V Overvoltage Protection Selectable Boost Frequency of 500 kHz or 1 MHz with Optionally Additional Offset Low Profile 12-Pin DSBGA Package Solution Size 32 mm² 2 Applications Smart-Phone LCD Backlighting LCD and Keypad Lighting 3 Description The LM3630A is a current-mode boost converter which supplies the power and controls the current in up to two strings of 10 LEDs per string. Programming is done over an I2C-compatible interface. The maximum LED current is adjustable from 5 mA to 28.5 mA. At any given maximum LED current the LED brightness is further adjusted with 256 exponential or linear dimming steps. Additionally, pulsed width modulation (PWM) brightness control can be enabled allowing for LED current adjustment by a logic level PWM signal. The boost switching frequency is programmable at 500 kHz for low switching loss performance or 1 MHz to ...