MAX5916AEUI+ Maxim Integrated Products, MAX5916AEUI+ Datasheet - Page 16

• Manufacturer Part Number: MAX5916AEUI+
• Description: IC HOT-SWAP CTRLR DUAL 28-TSSOP
• Manufacturer: Maxim Integrated Products
• Type: Hot-Swap Controllerr

Specifications of MAX5916AEUI+

• Applications: PCI 2.2 Server
• Internal Switch(s): No
• Voltage - Supply: 10.8 V ~ 13.2 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Select the external n-channel MOSFETs according to
the application’s current requirement. Limit switch power
dissipation by choosing a MOSFET with an R
enough to have a minimum voltage drop at full load.
High R
pulsing loads. High R
undervoltage fault at full load. Determine the MOSFET’s
power rating requirement to accommodate a short-cir-
cuit condition on the board during startup (see the
External MOSFET Thermal Considerations section).
Table 3 lists MOSFET and sense resistor manufacturers.
Dual PCI 2.2 Hot-Swap Controllers
Figure 4. Main and Auxiliary Supply Shutdown Control Logic for MAX5916/MAX5916A
16
______________________________________________________________________________________
STARTUP_3.3VAUXIN
SEE TABLE 2 FOR EXPLANATION OF SIGNALS.
ENABLE_3.3VAUXIN
STARTUP_+12VIN
DS(ON)
ENABLE_+12VIN
OC_3.3VAUXO_
UV_3.3VAUXO_
OC_+12VO_
UV_+12VO_
OC_-12VO_
OC_3.3VO_
UV_3.3VO_
OC_5VO_
UV_5VO_
causes output ripple if the board has
Applications Information
DS(ON)
Component Selection
can trigger an external
t
DELAY
External MOSFETs
t
DELAY
RESET
V
DS(ON)
POSITIVE EDGE
TRIGGERED D FLIP-FLOP,
RESET IS ACTIVE LOW
D
RESET
t
DELAY
RESET
low
Q
Q
The overcurrent sense voltage threshold on the +3.3V
output is 46mV and 31mV on the +5V output. Choose a
sense resistor using the following equation:
where I
Choose the sense resistors’ power rating to accommo-
date the overload current:
Connecting an external capacitance from the gates of
the external MOSFETs to GND slows the turn on of the
+5V and +3.3V supplies.
t
RESTART
LOAD
is the brickwall current limit for the output.
P
SENSE
R
V
Additional External Gate Capacitance
SENSE
POSITIVE EDGE TRIGGERED D FLIP-FLOP,
RESET IS ACTIVE LOW
D
RESET
t
RESTART
= (I
= (V-
LOAD
Q
Q
ILIM
V = INTERNAL SUPPLY LOGIC
GENERATED BY THE 12VIN OR THE
3.3VAUXIN, WHICHEVER IS HIGHER
)
2
HIGH = MAIN SUPPLIES
/ I
t
x R
RESTART
HIGH = AUX SUPPLY
LOAD
ARE TURNED OFF
SENSE
TURNED ON
Sense Resistors
MAIN OFF
AUX OFF
)