MAX1856EUB+

The MAX1856EUB+ from Maxim Integrated Products is a cost-effective PWM SLIC power supply designed for generating various negative output voltages, including -24V, -72V, -48V, -5V, -15V, and up to -185V for MEMS bias supplies. It operates with a wide input voltage range of 3V to 28V, making it suitable for cost-sensitive applications.

The device features an adjustable switching frequency from 100kHz to 500kHz, which can also be synchronized to an external clock for noise-sensitive applications. The flyback topology ensures high transformer utilization and low ripple current. Internal soft-start minimizes startup stress, and current-mode control eliminates the need for external loop compensation. It also includes logic-level shutdown functionality.

Applications for the MAX1856EUB+ include VoIP ringer and off-hook voltage generators, cable and DSL modems, set-top boxes, wireless local loop, FTTH, LMDS/MMDS, routers, industrial power supplies, CO DSL line driver supplies, and MEMS bias supplies. The component is housed in a 10-pin µMAX package and is designed for surface mount applications.

Key electrical characteristics include a 3V to 28V input range and an adjustable switching frequency of 100kHz to 500kHz. The output voltages are adjustable and can reach as high as -185V. The internal soft-start and current-mode PWM control scheme contribute to stable operation and protection.