User`s guide

3-12 MegaRAID SAS RAID Controller Characteristics

• Temperature range: +10 ° C to +60 ° C without battery backup unit

• Temperature range: +10 °C to +44.8 °C with iBBU battery backup

The parameters for the non-operating (such as storage and transit)

environment for these controllers are:

• Temperature range: −30° C to +80° C without the battery backup unit

• Temperature range: 0° C to +45° C with the battery backup unit

3.3.5 Power Supply Requirements for the SAS 9280 RAID Controllers

All power is supplied to the SAS 9280-8e and SAS 9280DE-8e RAID

controllers through the PCI Express 3.3V rails and the 12V rail. Onboard

switching regulator circuitry operating from the 3.3V rails and the 12V rail

provide the necessary voltages. The following states determine the

typical current consumption of the controller:

• State 1: During a hard reset

• State 2: During a disk stress test

• State 3: While sitting idle at the DOS prompt

The supply voltages are 12V ± 8 percent (from PCI edge connector only)

and 3.3V ± 9 percent (from PCI edge connector only). Ta bl e 3 .8 lists the

power supply for the controller for each of the three states at the different

voltages.

Table 3.8 Power Supply for the SAS 9280 RAID Controllers

Note:

+12V is used in the charging circuitry for the battery pack

on the optional iBBU battery-backed daughter card. If the

iBBU daughter card is mounted, the following power

consumption figures apply:

– During fast charging of the battery pack: 230mA in +12V

current

PCI Edge Connector State 1 State 2 State 3

3.3V supply 330mA 330mA 330mA

+12V supply 1.00A 1.81A 1.53A

3.3V auxiliary supply 30mA 30mA 30mA