MAX5916EUI+【PDF 15/25 页】IC HOT-SWAP CTRLR DUAL 28-TSSOP

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Output Undervoltage

The output voltages on all supplies, except the -12V

supply, are monitored for undervoltage. Output under-

voltage fault management is identical to the output

overcurrent fault management. Figures 5, 6, and 7 can

be used to illustrate undervoltage faults on the

MAX5915/MAX5915A/MAX5916/MAX5916A.

Thermal Shutdown Control

The MAX5915/MAX5915A/MAX5916/MAX5916A feature

internal thermal protection. Two thresholds detect when

the device is overheated. If the first threshold is reached,

the channel that is in overcurrent shuts down. If the sec-

ond thermal threshold is reached, the entire device shuts

down. The device cannot be restarted until the thermal

condition is cleared. For the MAX5915, the main chan-

nels turn back on after +12VIN or ON_ is toggled. For the

MAX5916, the main channels turn back on after

RESTART

. The auxiliary channels for the MAX5915/

MAX5915A/MAX5916/MAX5916A restart after t

RESTART

PGOOD_ Operation

The MAX5915/MAX5915A/MAX5916/MAX5916A incor-

porate a PGOOD_ output to report when power is good

to a microprocessor or controller. PGOOD_ remains low

if the auxiliary outputs are not powered, for PCI and

compact PCI systems where the 3.3VAUX is not avail-

able. Connect 3.3VAUXIN to 3.3VIN and connect

AUXON_ to ON_ to allow PGOOD_ to transition high

when the main supplies are available. The open-drain

structure of PGOOD_ requires an external pullup resis-

tor (see the Functional Diagram). Figure 8 shows the

internal logic of the PGOOD_ output.

Dual PCI 2.2 Hot-Swap Controllers

______________________________________________________________________________________ 15

DELAY

RESTART

ENABLE_+12VIN

STARTUP_+12VIN

OC_3.3VAUXO_

UV_3.3VAUXO_

RESET

POSITIVE EDGE

TRIGGERED D FLIP-FLOP,

RESET IS ACTIVE LOW

OC_3.3VO_

OC_5VO_

OC_+12VO_

OC_-12VO_

UV_3.3VO_

UV_5VO_

UV_+12VO_

POSITIVE EDGE TRIGGERED D FLIP-FLOP,

RESET IS ACTIVE LOW

HIGH = MAIN SUPPLIES

ARE TURNED OFF

MAIN ON

AUX OFF

HIGH = AUX SUPPLY

TURNED OFF

ENABLE_3.3VAUXIN

STARTUP_3.3VAUXIN

V = INTERNAL SUPPLY LOGIC

GENERATED BY THE 12VIN OR THE

3.3VAUXIN, WHICHEVER IS HIGHER

RESET

SEE TABLE 2 FOR EXPLANATION OF SIGNALS.

Figure 3. Main and Auxiliary Supply Shutdown Control Logic for MAX5915/MAX5915A

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