DC875B

DC875B is a demonstration circuit featuring the LTC3454EDD high efficiency buck-boost flash LED driver. The board has two circuits optimized for different applications: a small footprint solution featuring 350mA, 300ms LED flash current or 150mA constant LED torch current and a high current solution featuring 400/600/1000mA constant-current operation. The input voltage range of 2.7V to 5.5V is suitable for a single Lithium-Ion battery or three AAA batteries in series. The Li-Ion input range, high LED flash current with separate torch mode current setting, internal synchronous power switches, minimal and low-profile external components, and simple design makes the LTC3454 the top solution for highly efficient, space-constrained cellular telephone camera flash solutions.

• 10mVP–P typical output ripple VOUT at VIN = 4.2V, IOUT = 1.0A (20MHz BW)
• ±0.5% typical output regulation at line
• 1MHz nominal switching frequency
• 92% typical efficiency at VIN = 4.2V, IOUT = 150mA
• 86% typical efficiency at VIN = 4.2V, IOUT = 1000mA