ADM1014

The ADM1014 is a dual PCI voltage bus controller that allows hot-plugging of adapter cards into and out of an active or passive backplane. ADM1014 requires only four external power MOSFETs and a few discrete components for a complete power-control solution for two PCI slots.

The ADM1014 operates from a +12V and +3.3V AUX supply and controls five independent supplies (+3.3V, +3.3VAUX, +5V, +12V and 12V) on two separate channels (A and B). The power switches for the +3.3VAUX, +12V and 12V supplies are integrated onto the chip, and internal current limiting is provided. For the +3.3V and +5V supplies, the device drives external, N-channel, power MOSFETs, and provides overcurrent protection by sensing the voltage drop across external current-sense resistors. The current limits for all 10 supplies are set by a single resistor to GND, connected to the OCSET pin. Undervoltage sensing is provided on the +3.3V, +5V, +12V and +3.3VAux supplies. Overcurrent sensing is provided on all supplies. In the event of an overcurrent or undervoltage fault on any of the outputs of either channel, all outputs on that channel will be turned off. Turn-on slew rate may be controlled using eight external capacitors, connected to the gate drives of all of the supplies.

Logic control of the four main outputs is provided by ADM1014 PWRONA and PWRONB pins. When these pins are high, the outputs are turned on, when low, the outputs are turned off. The +3.3VAUX supplies have their own control inputs, PAUXA and PAUXB.