+48V Quad Hot-Swap Controllers For
Power-Over-LAN
_______________________________________________________________________________________ 9
Typical Operating Characteristics (continued)
(V
CSP
_ = V
CC
= +48V, V
DD
= +3.3V, V
RLY
= +12V, V
AGND
= V
DGND
= 0V, RTIM = open, T
A
= +25癈, unless otherwise specified.)
tO vs. INPUT VOLTAGE
V
DD
(V)
3.6
3.3
3.0
2.7
2.4
2.1
0
25
50
75
100
125
1.8
R
RTIM
= 40k&
R
RTIM
= OPEN
R
RTIM
= 2k&
RETRY DUTY CYCLE vs. DC
MAX5913A/14A toc35
A
B
C
100ms/div
V
GATE
= 20V/div, R
RTIM
= 2k&
A: V
GATE
, 20V/div, DC = UNCONNECTED (4%)
B: V
GATE
, 20V/div, DC = V
DD
(2%)
C: V
GATE
, 20V/div, DC = GND (1%)
CHANNEL-TO-CHANNEL CROSSTALK
MAX5913A/14A toc36
20祍/div
V
TEST
5V/div
V
OUT
0mV/div
SEE FIGURE 4 FOR TEST CIRCUIT
Pin Description
PIN
NAME
FUNCTION
1
FAULT
Active-Low Fault Output. FAULT is an open-drain output that goes low when a fault is
detected on any of the four channels. FAULT is low when an OC (open circuit) is
detected, or when the MAX5913A/MAX5914A is in auto-retry caused by an overcurrent
condition. When RTRYEN is low, and the channel switch is latched off due to an
overcurrent condition, FAULT remains low until ON_ is driven low.
2, 3, 4, 5
STAT1,
STAT2,
STAT3,
STAT4
Status Outputs. STAT_ are push-pull outputs. Depending on the STATOUT pin status,
STAT_ flags either the Power-OK_ or Port-OC_ status.
Power-OK_ high indicates:
a) ON_ input is high.
b) The switch port is fully on and startup is completed (V
CSP
_ - V
OUT
_) < V
SWON
.
c) Input voltage is above V
UVLO
.
d) Switch is not in current limit.
Power-OK_ low indicates a fault with any of the above conditions. Port-OC_ output high
indicates that the switch is latched off because the switch current is less than the open-
current threshold, Port-OC is low otherwise.
6, 10, 24, 28
CSP4, CSP3, CSP2,
CSP1
C ur r ent- S ense P osi
ti ve Inp ut. C onnect to V
CC
and p l ace a cur r ent-
sense r
esi stor fr om C
S P _
to D RAIN _. U se a Kel vi n sense tr ace fr om a cur r ent- sense r esi stor to C S P _ ( see Fi g ur e 7) .
7, 11, 23, 27
DRAIN4, DRAIN3,
DRAIN2, DRAIN1
MOSFET Drain Current-Sense Negative Input. Connect to drain of power MOSFET and
connect a current-sense resistor from CSP_ to DRAIN_. Use Kelvin sense trace from
current-sense resistor to DRAIN_ (see Figure 7).
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