MAX1856EUB+

The MAX1856EUB+ is a wide input range, synchronizable PWM SLIC power supply in 10 pin µMAX package. The MAX1856 offers a low-cost solution for generating a SLIC (ringer and off-hook) power supply. Using standard off-the-shelf transformers from multiple vendors, the MAX1856 generates various output voltages -24V and -72V for both ringer and off-hook supplies for voice-enabled broadband consumer premises equipment, -48V for IP phones and routers, -5V and -15V (single or dual output) for DSL CO line drivers or negative voltages as high as -185V for MEMS bias supplies. The output voltages are adjusted with an external voltage divider. Due to its wide operating voltage range, the MAX1856 operates from a low-cost, unregulated DC power supply for cost-sensitive applications like xDSL, cable modems, set-top boxes, LMDS, MMDS, WLL and FTTH CPE. The MAX1856 provides low audio-band noise for talk battery and a sturdy output capable of handling the ring trip conditions for ring battery.

• Supply voltage range is 3V to 28V
• Operating temperature range from -40°C to 85°C
• Low cost, off the shelf transformer
• Low audio band noise on talk battery
• Effectively handles ring trip transients
• Powers 2, 4 or 12 line equipment
• High efficiency extends battery life during life-line support conditions
• Adjustable 100KHz to 500KHz switching frequency
• Clock synchronization and internal soft-start
• Current-mode PWM and idle mode control scheme

Applications

Power Management, Industrial, Portable Devices

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party