MAX1856EUB+

直流/直流控制器, 3V至28V, 1输出, 500KHZ, uMAX-10

The 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.

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Supply voltage range is 3V to 28V

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Operating temperature range from -40°C to 85°C

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Low cost, off the shelf transformer

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Low audio band noise on talk battery

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Effectively handles ring trip transients

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Powers 2, 4 or 12 line equipment

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High efficiency extends battery life during life-line support conditions

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Adjustable 100KHz to 500KHz switching frequency

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Clock synchronization and internal soft-start

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Current-mode PWM and idle mode control scheme