Power and Thermal Management ICs
Volume 7, Issue 2 YOUR SEMICONDUCTOR SOLUTIONS RESOURCE

Safeguard and Optimize Communications Networks with ADI's New Quad Channel Voltage Monitor and Sequencer

The ADM1185 quad voltage monitor and sequencer is designed for systems with multiple power supplies. Typical applications include wireless base stations and switching stations. These systems require robust sequencer products to ensure voltage rails are powered up in a controlled manner to prevent equipment damage and network downtime. By providing both a voltage monitoring and sequencing function for up to four power supply rails, the ADM1185 can actively control the order in which the rails are powered up, as well as monitor the system to ensure the rails are quickly powered down if a failure does occur. Beyond this supervisory functionality, the device also offers user programmability that allows power supply designers to enable any power-up sequence simply by selecting a specific supply and input. User programmable time delays can also be set using external capacitors. The device is housed in a tiny 10-lead MSOP package, making it the industry's smallest quad sequencer. ADI also offers the ADM106x, ADM108x, ADM6819, and ADM6820 voltage monitor and sequencer families, which support a 2 to 10 power supply rails range.

ADM1185

 Powered from 2.7 V to 5.5 V on the VCC pin
 Monitors four supplies via 0.8% accurate comparators
 Monitor different voltage levels with resistor dividers
 3 open-drain enable outputs
 1 power-good (PWRGD) output
 Package: 10-lead MSOP

Protect Line Cards from Power and Thermal Transients with New Hot Swap Devices with Integrated Digital Power Monitor

The ADM1175/ADM1176/ADM1177/ADM1178 family of products combines a hot swap controller with an on-board, 12-bit ADC-based digital power monitor. These devices are full feature positive hot swap controllers that allow boards to be safely inserted and removed from a live 3.15 V to 16.5 V backplane. These parts provide precise robust current limiting, protection against transient and nontransient short circuits, and overcurrent and undervoltage conditions. In addition to the standard hot swap functionality, the on-board power monitor allows engineers and technicians to precisely monitor the power profile of each individual line card within a designated rack system. Communication to the power monitor is provided via an on-board I2C® port. These devices are offered in 10-lead MSOP packages—the smallest in the industry.

ADM1175

 Precision in-rush linear current limit
 On-board, 12-bit power monitor
 I2C® control
 Convert pin allows for parallel sampling of power rails
 Available in latch-off and multiple retry variants
 Up to 10,000 samples/sec allowing for detailed power profiling

For more information on ADI's complete portfolio of hot swap devices, visit www.analog.com/hotswap.

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