MAX5959 Maxim Integrated Products, MAX5959 Datasheet - Page 13

• Manufacturer Part Number: MAX5959
• Description: (MAX5959 / MAX5960) Hot-Plug Controllers
• Manufacturer: Maxim Integrated Products

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PIN
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
62
PRES-DETB
PRES-DETA
OUTPUT4
OUTPUT3
AUXONA
INPUT4
INPUT3
3.3SD+
3.3SA+
12SD+
3.3SD-
12SA+
NAME
3.3GD
3.3SA-
FONB
FONA
12SA-
12GA
ONA
______________________________________________________________________________________
Quad PCI Express, Hot-Plug Controllers
Slot D 12V Positive Current-Sense Input. Connect the positive terminal of the current-sense resistor to
12SD+ using the Kelvin-sensing technique to ensure accurate current sensing.
Slot D 3.3V Gate-Drive Output. Connect 3.3GD to the gate of slot D’s 3.3V MOSFET. At power-up,
V
rise time is determined by the external gate capacitance.
Slot D 3.3V Negative Current-Sense Input. Connect to the negative side of the sense resistor using the
Kelvin-sensing technique to ensure accurate current sensing.
Slot D 3.3V Positive Current-Sense Input. Connect the positive side of the current-sense resistor to
3.3SD+ using the Kelvin-sensing technique to ensure accurate current sensing.
Slot B Present-Detect Input. PRES-DETB accepts inputs from PRSNT#_# on a PCIe connector.
PRES-DETB has an internal 50kΩ pullup to 3.3VAUXIN. When PRES-DETB is low, the outputs follow the
command from ONB and AUXONB after a 4ms debounced time. When PRES-DETB goes from low to
high, all outputs of the respective slot shut down with no delay.
Slot B Forced-On Input. FONB has a 50kΩ internal pullup to 3.3VAUXIN. A logic-low on FONB turns on
all slot B outputs as long as the power inputs are within their operating range, regardless of the status of
the other input signals. Leave FONB unconnected for normal operation.
Slot A Present-Detect Input. PRES-DETA accepts inputs from PRSNT#_# on a PCIe connector.
PRES-DETA has an internal 50kΩ pullup to 3.3VAUXIN. When PRES-DETA is low, the outputs follow the
command from ONA and AUXONA after a 4ms debounced time. When PRES-DETA goes from low to
high, all outputs of the respective slot shut down with no delay.
Slot A Forced-On Input. FONA has a 50kΩ internal pullup to 3.3VAUXIN. A logic-low on FONA turns on
all slot A outputs as long as the power inputs are within their operating range, regardless of the status of
the other input signals. Leave FONA unconnected for normal operation.
Digital Output 4. 4ms debounced digital output of INPUT4.
Digital Logic Gate Input 4
Digital Output 3. 4ms debounced digital output of INPUT3.
Digital Logic Gate Input 3
Slot A 12V and 3.3V Outputs Enable. A logic-high at ONA turns on the 12V and 3.3V outputs of slot A
(see Table 2).
Slot A 3.3V Auxiliary Output Enable. A logic-high at AUXONA turns on the slot A auxiliary output.
Slot A 12V Positive Current-Sense Input. Connect the positive terminal of the current-sense resistor to
12SA+ using the Kelvin-sensing technique to ensure accurate current sensing.
Slot A 12V Negative Current-Sense Input. Connect 12SA- to the negative side of the current-sense
resistor using the Kelvin-sensing technique to ensure accurate current sensing.
Slot A 12V Gate-Drive Output. Connect 12GA to the gate of slot A’s 12V MOSFET. At power-up, V
is raised to the internal charge-pump voltage level by a constant current.
Slot A 3.3V Positive Current-Sense Input. Connect the positive side of the current-sense resistor to
3.3SA+ using the Kelvin-sensing technique to ensure accurate current sensing.
Slot A 3.3V Negative Current-Sense Input. Connect to the negative side of the sense resistor using the
Kelvin-sensing technique to ensure accurate current sensing.
3.3GD
is charged to 5.5V above the 3.3V supply by a constant current derived from V
FUNCTION
Pin Description (continued)
12VIN
.
V 3.3GD
12GA
’s
13