MAX5916EUI+【PDF 13/25 页】IC HOT-SWAP CTRLR DUAL 28-TSSOP

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channel outputs, auxiliary and main. A fault condition

occurs when the output voltage falls below the set

undervoltage threshold or the output current reaches the

overcurrent threshold. When a fault occurs, all supplies

of the affected channel are disabled after a time period

DELAY

. All outputs are automatically restarted after a

time equal to t

RESTART

. This reset is built into all devices.

Current Limits

All supplies are protected against output overcurrent or

short-circuit conditions. The MAX5915/MAX5915A and

MAX5916/MAX5916A employ a brickwall current limit

on the +3.3V and +5V supplies and a current-foldback

scheme on the ?2V and +3.3V auxiliary supplies.

Brickwall

A brickwall current limit protects the +3.3V and +5V

main supplies by limiting the load current. The external

sense resistors and the current-limit threshold set the

brickwall current limits. A fault occurs when the load

current reaches the brickwall limit. The main outputs

shut down after t

DELAY

if the fault remains. The brick-

wall feature limits inrush current caused by positive

supply voltage steps.

Foldback

The ?2V and +3.3V auxiliary supplies employ an

internal current-foldback scheme. The MAX5915/

MAX5915A/MAX5916/MAX5916A gradually limit the load

current once the current-foldback threshold is reached. If

the overcurrent condition lasts longer than a fast tran-

sient, the output current is reduced to the foldback cur-

rent limit and remains at that level for t

DELAY

unless the

overcurrent condition is cleared. See the Typical

Operating Characteristics.

Dual PCI 2.2 Hot-Swap Controllers

______________________________________________________________________________________ 13

START

ON_

+12VIN

3.3VAUXIN

PGOOD_

TIMING NOT TO SCALE

AUXON_

+12V

UVLO THRESHOLD

3.3VAUX UVLO THRESHOLD

+12VO_

5VO_

3.3VO_

3.3VAUXO_

-12VO_

Figure 1. Startup Waveforms

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