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MAX5931AEEP+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P23
XXXX
MAX5930A toc19
V
INX
2V/div
0V
V
ONX
2V/div
5V/div
0V
4ms/div
V
GATEY
V
GATEX
V
PWRRDY
TURN-OFF IN
VOLTAGE-TRACKING MODE
XXXX
MAX5930A toc20
V
INX
2V/div
V
ONX
2V/div
0V
5V/div
4ms/div
V
GATEY
V
GATEX
TURN-ON IN
POWER-SEQUENCING MODE
V
PWRRDY
0V
0V
XXXX
MAX5930A toc21
V
INX
2V/div
V
ONX
2V/div
5V/div
0V
0V
0V
4ms/div
V
GATEY
V
GATEX
TURN-OFF IN
POWER-SEQUENCING MODE
V
PWRRDY
MAX5930A/MAX5931A/MAX5931B
Low-Voltage, Triple, Hot-Swap Controllers/
Power Sequencers/Voltage Trackers
_______________________________________________________________________________________
7
XXXX
MAX5930A toc22
V
INX
2V/div
V
ONX
2V/div
5V/div
0V
4ms/div
TURN-ON IN
INDEPENDENT MODE
V
GATEY
V
GATEX
0V
XXXX
MAX5930A toc23
V
INX
2V/div
0V
V
ONX
2V/div
5V/div
0V
4ms/div
TURN-OFF IN
INDEPENDENT MODE
V
PWRRDY
V
GATEY
V
GATEX
0
20
10
30
40
50
20 50
STRONG GATE DISCHARGE CURRENT
vs. OVERDRIVE
MAX5930A toc24
V
IN_
- V
SENSE_
(mV)
GATE DISCHARGE CURRENT (mA)
3525 30 40 45
V
INX
= 5V
V
INX
= 2.7V
V
ONX
=
V
IN
V
GATE
= 5V
AFTER STARTUP
LIM_ = GND V
INX
= 12V
Typical Operating Characteristics (continued)
(
Typical Operating Circuit
, Q1 = Q2 = Q3 = Fairchild FDB7030L, V
IN1
= +12.0V, V
IN2
= +5.0V, V
IN3
= +1V, T
A
= +25°C, unless oth-
erwise noted. Channels 1 through 3 are identical in performance. Where characteristics are interchangeable, channels 1 through 3
are referred to as X, Y, and Z.)
MAX5930A/MAX5931A/MAX5931B
Low-Voltage, Triple, Hot-Swap Controllers/
Power Sequencers/Voltage Trackers
8 _______________________________________________________________________________________
Pin Description
PIN
MAX5930A
MAX5931A/
MAX5931B
NAME FUNCTION
1 — POL STAT Output-Polarity Select. See Table 3 and the Status Outputs (STAT_) section.
2 1 ON2 On/Off Channel 2 Control Input. See the Mode section.
3 2 ON1 On/Off Channel 1 Control Input. See the Mode section.
4 — LIM1
Channel 1 Current-Limit Setting. Connect a resistor from LIM1 to GND to set current-trip
level. Connect to GND for the default 25mV threshold. Do not leave LIM1 unconnected.
5 3 IN1
Channel 1 Supply Input. Connect to a 1V to 15V supply voltage and to one end of R
SENSE1
.
Bypass with a 0.1µF capacitor to ground.
6 4 SENSE1
Channel 1 Current-Sense Input. Connect SENSE1 to the drain of an external MOSFET and
to one end of R
SENSE1
.
7 5 GATE1 Channel 1 Gate-Drive Output. Connect to the gate of the external n-channel MOSFET.
8 6 STAT1
Op en- D r ai n S tatus S i g nal for C hannel 1. S TAT1 asser ts w hen hot sw ap i s successful and t
S T AR T
has el ap sed . S TAT1 d easser ts i f ON 1 i s l ow , or i f channel 1 i s tur ned off for any faul t cond i ti on.
9 7 STAT2
Op en- D r ai n S tatus S i g nal for C hannel 2. S TAT2 asser ts w hen hot sw ap i s successful and t
S T AR T
has el ap sed . S TAT2 d easser ts i f ON 2 i s l ow , or i f channel 2 i s tur ned off for any faul t cond i ti on.
10 8 TIM
Startup Timer Setting. Connect a resistor from TIM to GND to set the startup period. Leave
TIM unconnected for the default startup period of 9ms. R
TIM
must be between 4kΩ and
500kΩ.
11 9 LATCH
Latch/Autoretry Selection Input. Connect LATCH to GND for autoretry mode after a fault.
Leave LATCH unconnected for latch mode.
12 10 STAT3
Open-Drain Status Signal for Channel 3. STAT3 asserts when hot swap is successful and
t
START
has elapsed. STAT3 deasserts if ON3 is low, or if channel 3 is turned off for any fault
condition.
13 11 BIAS
S up p l y Refer ence Outp ut. The hi g hest sup p l y i s avai l ab l e at BIAS for fi l ter i ng . C onnect a 1nF
to 10nF cer am i c cap aci tor fr om BIAS to GN D . N o other connecti ons ar e al l ow ed to BIAS .
14 12 GND Ground
15 13 GATE3 Channel 3 Gate-Drive Output. Connect to gate of external n-channel MOSFET.
16 14 SENSE3
Channel 3 Current-Sense Input. Connect SENSE3 to the drain of an external MOSFET and
to one end of R
SENSE3
.
17 15 IN3
Channel 3 Supply Input. Connect to a supply voltage from 1V to 15V and to one end of
R
SENSE3
. Bypass with a 0.1µF capacitor to ground.
18 — LIM3
Channel 3 Current-Limit Setting. Connect a resistor from LIM3 to GND to set current-trip
level. Connect to GND for the default 25mV threshold. Do not leave LIM3 unconnected.
19 16 GATE2 Channel 2 Gate-Drive Output. Connect to gate of external n-channel MOSFET.
20 17 SENSE2
Channel 2 Current-Sense Input. Connect SENSE2 to the drain of an external MOSFET and
to one end of R
SENSE2
.
21 18 IN2
Channel 2 Supply Input. Connect to a 1V to 15V supply voltage and to one end of R
SENSE2
.
Bypass with a 0.1µF capacitor to ground.
22 — LIM2
Channel 2 Current-Limit Setting. Connect a resistor from LIM2 to GND to set current-trip
level. Connect to GND for the default 25mV threshold. Do not leave LIM2 unconnected.
Detailed Description
The MAX5930A/MAX5931A/MAX5931B are circuit-
breaker ICs for hot-swap applications where a line card
is inserted into a live backplane. The MAX5931A/
MAX5931B operate down to 1V provided one of the
inputs is above 2.7V. Normally, when a line card is
plugged into a live backplane, the card’s discharged
filter capacitors provide low impedance that can
momentarily cause the main power supply to collapse.
The MAX5930A/MAX5931A/MAX5931B reside either on
the backplane or on the removable card to provide
inrush current limiting and short-circuit protection. This
is achieved by using external n-channel MOSFETs,
external current-sense resistors, and on-chip compara-
tors. The startup period and current-limit threshold of
the MAX5930A/MAX5931A/MAX5931B can be adjusted
with external resistors. Figure 1 shows the MAX5930A/
MAX5931A/MAX5931B functional diagram.
The MAX5930A offers three programmable current lim-
its, selectable fault-management mode, and selectable
STAT_ output polarity. The MAX5930A features fixed
current limits, selectable fault-management mode, and
fixed STAT_ output polarity.
Mode
The MAX5930A/MAX5931A/MAX5931B support three
modes of operation: voltage-tracking, power-sequenc-
ing, and independent mode. Select the appropriate
mode according to Table 1.
Voltage-Tracking Mode
Connect MODE high to enter voltage-tracking mode.
While in voltage-tracking mode, all channels turn on
and off together. To turn all channels on:
• At least one V
IN_
must exceed V
UVLO
(2.45V) for the
UVLO to startup delay (37.5ms).
• All V
IN_
must exceed V
PWRRDY
(0.95V).
• All V
ON_
must exceed V
ON,TH
(0.875V).
• No faults may be present on any channel.
The MAX5930A/MAX5931A/MAX5931B turn off all
channels if any of the above conditions are not met.
After a fault-latched shutdown, cycle any of the ON_
pins to unlatch and restart all channels.
Power-Sequencing Mode
Leave MODE unconnected to enter power-sequencing
mode. While in power-sequencing mode, the
MAX5930A/MAX5931A/MAX5931B turn on and off each
channel depending on the state of the corresponding
V
ON_
. To turn on a given channel:
• At least one V
IN_
must exceed V
UVLO
(2.45V) for the
UVLO to startup delay (37.5ms).
• All V
IN_
must exceed V
PWRRDY
(0.95V).
• The corresponding V
ON_
must exceed V
ON,TH
(0.875V).
• No faults may be present on any channel.
The MAX5930A/MAX5931A/MAX5931B turn off all chan-
nels if any of the above conditions are not met. After a
fault-latched shutdown, cycle any of the ON_ inputs to
unlatch and restart all channels, dependent on the corre-
sponding V
ON_
state.
Independent Mode
Connect MODE to GND to enter independent mode.
While in independent mode the MAX5930A/
MAX5931A/MAX5931B provide complete independent
control for each channel. To turn on a given channel:
• At least one V
IN_
must exceed V
UVLO
(2.45V) for the
UVLO to startup delay (37.5ms).
• The corresponding V
IN_
must exceed V
PWRRDY
(0.95V).
• The corresponding V
ON_
must exceed V
ON,TH
(0.875V).
MAX5930A/MAX5931A/MAX5931B
Low-Voltage, Triple, Hot-Swap Controllers/
Power Sequencers/Voltage Trackers
_______________________________________________________________________________________ 9
MODE OPERATION
High (Connect to BIAS) Voltage Tracking
Unconnected Voltage Sequencing
GND Independent
Table 1. Operational Mode Selection
PIN
MAX5930A
MAX5931A/
MAX5931B
NAME FUNCTION
23 19 ON3 On/Off Channel 3 Control Input. See the Mode section.
24 20 MODE
Mode Configuration Input. Mode is configured according to Table 1 as soon as one of the
IN_ voltages exceeds UVLO and before turning on OUT_ (see the Mode section).
Pin Description (continued)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P23

MAX5931AEEP+T

Mfr. #:
Buy MAX5931AEEP+T
Manufacturer:
Maxim Integrated
Description:
Hot Swap Voltage Controllers Triple Hot-Swap Controller
Lifecycle:
New from this manufacturer.
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