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MAX5929AEEG+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P23
MAX5927A/MAX5929A–MAX5929D
Low-Voltage, Quad, Hot-Swap
Controllers/Power Sequencers
_______________________________________________________________________________________
7
XXXX
MAX5927A toc22
V
INW
2V/div
0V
V
ONW
2V/div
0V
5V/div
0V
4ms/div
TURN-ON IN
INDEPENDENT MODE
V
GATEX
V
GATEW
XXXX
MAX5927A toc23
V
INW
2V/div
0V
V
ONW
2V/div
5V/div
0V
4ms/div
TURN-OFF IN
INDEPENDENT MODE
V
PWRRDY
V
GATEX
V
GATEW
0V
0
10
30
20
40
50
STRONG GATE DISCHARGE CURRENT
vs. OVERDRIVE
MAX5927A toc24
V
IN_
- V
SENSE_
(mV)
GATE DISCHARGE CURRENT (mA)
20 3525
30 45
40 50
V
INW
= 5V
V
INW
= 2.7V
V
ONW
= V
IN
V
GATE
= 5V
AFTER STARTUP
V
INW
= 12V
Typical Operating Characteristics (continued)
(
Typical Operating Circuit
, Q1 = Q2 = Q3 = Q4 = Fairchild FDB7090L, V
IN1
= 12V, V
IN2
= 5.0V, V
IN3
= 3.3V, V
IN4
= 1.0V, T
A
=
+25°C, unless otherwise noted. Channels 1 through 4 are identical in performance. Where characteristics are interchangeable,
channels 1 through 4 are referred to as W, X, Y, and Z.)
MAX5927A/MAX5929A–MAX5929D
Low-Voltage, Quad, Hot-Swap
Controllers/Power Sequencers
8
______________________________________________________________________________________________________________________________________________________________________________
Pin Description
PIN
MAX5927A
MAX5929A–
MAX5929D
NAME FUNCTION
1 4 IN1
Channel 1 Supply Input. Connect to a supply voltage from 1V to 15V and to one end of
R
SENSE1
. Bypass with a 0.1µF capacitor to ground.
2 5 SENSE1
Channel 1 Current-Sense Input. Connect SENSE1 to the drain of an external MOSFET
and to one end of R
SENSE1
.
3 6 GATE1 Channel 1 Gate-Drive Output. Connect to gate of external n-channel MOSFET.
4 — LIM4
Channel 4 Current-Limit Setting. Connect a resistor from LIM4 to GND to set current-trip
level. Connect to GND for the default 25mV threshold. Do not leave unconnected.
5 7 IN4
Channel 4 Supply Input. Connect to a supply voltage from 1V to 15V and to one end of
R
SENSE4
. Bypass with a 0.1µF capacitor to ground.
6 8 SENSE4
Channel 4 Current-Sense Input. Connect SENSE4 to the drain of an external MOSFET
and to one end of R
SENSE4
.
7 9 GATE4 Channel 4 Gate-Drive Output. Connect to gate of external n-channel MOSFET.
8 10 STAT1
Open-Drain Status Signal for Channel 1. STAT1 asserts when hot swap is successful and
t
START
has elapsed. STAT1 deasserts if ON1 is low, or if channel 1 is turned off for any
fault condition.
9 11 STAT2
Open-Drain Status Signal for Channel 2. STAT2 asserts when hot swap is successful and
t
START
has elapsed. STAT2 deasserts if ON2 is low, or if channel 2 is turned off for any
fault condition.
10 12 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, 20 — N.C. No Connection. Not internally connected.
12 — LATCH
Latch/Autoretry Selection Input. Connect LATCH to GND for autoretry mode after a fault.
Leave LATCH unconnected for latch mode.
13 13 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.
14 14 STAT4
Open-Drain Status Signal for Channel 4. STAT4 asserts when hot swap is successful and
t
START
has elapsed. STAT4 deasserts if ON4 is low, or if channel 4 is turned off for any
fault condition.
15 15 BIAS
Supply Reference Output. The highest supply is available at BIAS for filtering. Connect a
1nF to 10nF ceramic capacitor from BIAS to GND. No other connections are allowed to
this pin.
16 16 GND Ground
17 17 GATE3 Channel 3 Gate-Drive Output. Connect to gate of external n-channel MOSFET.
18 18 SENSE3
Channel 3 Current-Sense Input. Connect SENSE3 to the drain of an external MOSFET
and to one end of R
SENSE3
.
19 19 IN3
Channel 3 Supply Input. Connect to a supply voltage from 1V to 15V and to one end of
R
SENSE3
.
21 — 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 unconnected.
Detailed Description
The MAX5927A/MAX5929A–MAX5929D are circuit-
breaker ICs for hot-swap applications where a line card
is inserted into a live backplane. The MAX5927A/
MAX5929A–MAX5929D operate down to 1V provided
one of the inputs is at or ≥ 2.7V. Normally, when a line
card is plugged into a live backplane, the card’s dis-
charged filter capacitors provide low impedance that
can momentarily cause the main power supply to col-
lapse. MAX5927A/MAX5929A–MAX5929D 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, exter-
nal current-sense resistors, and on-chip comparators.
The startup period and current-limit threshold of the
MAX5927A/MAX5929A–MAX5929D can be adjusted
with external resistors. Figure 1 shows the MAX5927A/
MAX5929A–MAX5929D functional diagram.
The MAX5927A offers four programmable current limits,
selectable fault management mode, and selectable
STAT_ output polarity. The MAX5929A–MAX5929D fea-
ture fixed current limits, and a variety of fault manage-
ment and STAT_ polarity option combinations.
Mode
The MAX5927A/MAX5929A–MAX5929D support three
modes of operation: voltage tracking, power sequenc-
ing, and independent. 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.
MAX5927A/MAX5929A–MAX5929D
Low-Voltage, Quad, Hot-Swap
Controllers/Power Sequencers
______________________________________________________________________________________________________________________________________________________________________________
9
MODE OPERATION
High (connect to BIAS) Voltage tracking
Unconnected Power sequencing
GND Independent
Table 1. Operational Mode Selection
PIN
MAX5927A
MAX5929A–
MAX5929D
NAME FUNCTION
22 20 GATE2 Channel 2 Gate-Drive Output. Connect to gate of external n-channel MOSFET.
23 21 SENSE2
Channel 2 Current-Sense Input. Connect SENSE2 to the drain of an external MOSFET
and to one end of R
SENSE2
.
24 22 IN2
Channel 2 Supply Input. Connect to a supply voltage from 1V to 15V and to one end of
R
SENSE2
.
25 — LIM2
Channel 2 Current-Limit Setting. Connect a resistor from LIM2 to GND to set the current-
trip level. Connect to GND for the default 25mV threshold. Do not leave unconnected.
26 23 ON4 On/Off Channel 4 Control Input. See the Mode section.
27 24 ON3 On/Off Channel 3 Control Input. See the Mode section.
28 1 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.
29 — POL STAT Output Polarity Select. See Table 3 and the Status Output section.
30 2 ON2 On/Off Channel 2 Control Input. See the Mode section.
31 3 ON1 On/Off Channel 1 Control Input. See the Mode section.
32 — LIM1
Channel 1 Current-Limit Setting. Connect a resistor from LIM1 to GND to set the current-
trip level. Connect to GND for the default 25mV threshold. Do not leave unconnected.
EP — EP
Exposed Pad. EP is internally connected to GND. Leave EP unconnected or connect to
GND.
Pin Description (continued)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P23

MAX5929AEEG+T

Mfr. #:
Buy MAX5929AEEG+T
Manufacturer:
Maxim Integrated
Description:
Hot Swap Voltage Controllers Quad Hot-Swap Controller
Lifecycle:
New from this manufacturer.
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