High efficiency adaptable power supply for XENPAK 10Gb/s Ethernet transceivers
Dongyan Zhou
Abstract
The LTC1773, a simple and efficient solution for XENPAK adaptable power supplies, is described.
Keywords
Adaptable power supply
XENPAK
LTC1773
Introduction
The XENPAK Multisource Agreement (MSA) defines a fiber optic module that conforms to the 10 Gb/s Ethernet standard specified by IEEE 802.3ae. These modules require an adaptable power supply rail (APS) that has a variable output voltage from 0.9V to 1.8V, generated from a 3.3V input. The LTC1773 current mode synchronous buck regulator provides an efficient, cost-effective and space saving APS solution that exceeds the MSA standard as well as other similar standards.
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