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

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Power Management, Industrial, Portable Devices

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