IC eliminates DC-DC module in telecom boards

14 February 2001 Power Electronics / Power Management

Linear Technology's LTC1876 is a triple output DC-DC converter with two step-down outputs and one step-up output in a 36-lead SSOP package. This IC eliminates the need for a 2,5 V isolated DC-DC module in telecom systems, which require 3,3, 2,5 and 1,8 V rails. The LTC1876 offers as much as 50% savings by reducing the cost and inventory to only one isolated 3,3V DC-DC module for these telecom systems, says the manufacturer. The LTC1876 is used to convert the 3,3V output of the DC/DC module to two lower voltages at up to 15 A while achieving an operating efficiency as high as 90%. DC isolation is preserved since the 3,3 V input to the LTC1876 is isolated. Applications include telecom/networking infrastructure equipment, industrial CPU board, ATM trunk cards, Ethernet/ISDN boards and servers.

The LTC1876 allows the use of off-the-shelf 5V-logic N-channel MOSFETs for low-cost, product availability and high operating efficiency. It achieves the optimum 5 V gate drive capability by using its on-board 1 A step-up DC-DC regulator to boost the 3,3 input to 5 V. Alternative solutions require two ICs to accomplish the same task. They are more complex and also occupy more PC board space.

The LTC1876 comes in 36-lead SSOP package and is specified for -40 to +85°C.

Insight - Memec

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