19-3443; Rev 2; 10/06
KIT
ATION
EVALU
BLE
AVAILA
1V to 13.2V, n-Channel Hot-Swap Controllers
Require No Sense Resistor
General Description
The MAX5924/MAX5925/MAX5926 1V to 13.2V hot-swap
controllers allow the safe insertion and removal of circuit
cards into live backplanes. These devices hot swap sup-
plies ranging from 1V to 13.2V provided that the device
supply voltage, V
CC
, is at or above 2.25V and the hot-
swapped supply, V
S
, does not exceed V
CC
.
The MAX5924/MAX5925/MAX5926 hot-swap controllers
limit the inrush current to the load and provide a circuit-
breaker function for overcurrent protection. The devices
operate with or without a sense resistor. When operat-
ing without a sense resistor, load-probing circuitry
ensures a short circuit is not present during startup,
then gradually turns on the external MOSFET. After the
load probing is complete, on-chip comparators provide
overcurrent protection by monitoring the voltage drop
across the external MOSFET on-resistance. In the event
of a fault condition, the load is disconnected.
The MAX5924/MAX5925/MAX5926 include many inte-
grated features that reduce component count and
design time, including configurable turn-on voltage,
slew rate, and circuit-breaker threshold. An on-board
charge pump provides the gate drive for a low-cost,
external n-channel MOSFET.
The MAX5924/MAX5925/MAX5926 are available with
open-drain PGOOD and/or
PGOOD
outputs. The
MAX5925/MAX5926 also feature a circuit breaker with
temperature-compensated R
DS(ON)
sensing. The
MAX5926 features a selectable 0ppm/°C or 3300ppm/°C
temperature coefficient. The MAX5924 temperature coef-
ficient is 0ppm/°C and the MAX5925 temperature coeffi-
cient is 3300ppm/°C. Autoretry and latched fault-
management configurations are available (see the
Selector Guide).
♦
♦
♦
♦
♦
♦
♦
♦
♦
♦
Features
Hot Swap 1V to 13.2V with V
CC
≥
2.25V
Drive High-Side n-Channel MOSFET
Operation With or Without R
SENSE
Temperature-Compensated R
DS(ON)
Sensing
Protected During Turn-On into Shorted Load
Adjustable Circuit-Breaker Threshold
Programmable Slew-Rate Control
Programmable Turn-On Voltage
Autoretry or Latched Fault Management
10-Pin µMAX
®
or 16-Pin QSOP Packages
MAX5924/MAX5925/MAX5926
Ordering Information
PART
MAX5924AEUB
MAX5924BEUB
MAX5924CEUB*
MAX5924DEUB*
MAX5925AEUB
MAX5925BEUB*
MAX5925CEUB*
MAX5925DEUB*
MAX5926EEE
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
10 µMAX
10 µMAX
10 µMAX
10 µMAX
10 µMAX
10 µMAX
10 µMAX
10 µMAX
16 QSOP–EP**
*Future
product—contact factory for availability.
**EP
= Exposed pad.
Typical Operating Circuits
TYPICAL OPERATION WITHOUT R
SENSE
BACKPLANE
V
S
V
CC
REMOVABLE CARD
1V TO V
CC
2.25V TO 13.2V
R
CB
CB
V
CC
GATE SENSE OUT
SC_DET
R
SC
N
V
OUT
Applications
Base Stations
RAID
Remote-Access Servers
Network Routers and Switches
Servers
Portable Device Bays
GND
GND
MAX5925
MAX5926
µMAX is a registered trademark of Maxim Integrated Products, Inc.
SEE FIGURE 1 FOR A DETAILED TYPICAL OPERATING CIRCUIT WITHOUT RSENSE.
Selector Guide appears at end of data sheet.
Pin Configurations appear at end of data sheet.
Typical Operating Circuits continued at end of data sheet.
1
________________________________________________________________
Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1V to 13.2V, n-Channel Hot-Swap Controllers
Require No Sense Resistor
MAX5924/MAX5925/MAX5926
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND, unless otherwise noted).
V
CC
.........................................................................-0.3V to +14V
GATE*.....................................................................-0.3V to +20V
All Other Pins ............-0.3V to the lower of (V
CC
+ 0.3V) or +14V
SC_DET Current (200ms pulse width, 15% duty cycle) ...140mA
Continuous Current (all other pins) .....................................20mA
Continuous Power Dissipation (T
A
= +70°C)
10-Pin µMAX (derate 6.9mW/°C above +70°C) ...........556mW
16-Pin QSOP (derate 18.9mW/°C above +70°C).......1509mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature .....................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
*GATE
is internally driven and clamped. Do not drive GATE with external source.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V
CC
, EN (MAX5924/MAX5925), EN1 (MAX5926) = +2.25V to +13.2V;
EN2
(MAX5926) = 0V; V
S
(see Figure 1) = +1.05V to V
CC
; T
A
=
-40°C to +85°C, unless otherwise noted. Typical values are at V
CC
= 5V, RL = 500Ω from OUT to GND, CL = 1µF, SLEW = open, T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETER
POWER SUPPLIES
V
CC
Operating Range
V
S
Operating Range
Supply Current
UNDERVOLTAGE LOCKOUT (UVLO)
UVLO Threshold
V
CC
UVLO Deglitch Time
V
CC
UVLO Startup Delay
LOAD-PROBE
Load-Probe Resistance (Note 3)
Load-Probe Timeout
Load-Probe Threshold Voltage
CIRCUIT BREAKER
I
CB
TC = high (MAX5926), MAX5924
TC = low (MAX5926),
MAX5925 (Note 5)
V
CC
= 2.25V,
T
A
= +25°C
5V
≤
V
CC
≤
13.2V,
T
A
= +25°C
V
CC
= 2.25V,
T
A
= +85°C
5V
≤
V
CC
≤
13.2V,
T
A
= +85°C
34
44
49
47
58
37
51
54
52
63
42
58
58
60
70
R
LP
t
LP
V
LP,TH
(Note 4)
2.25V < V
CC
< 5V
5V < V
CC
< 13.2V
4
3
43
172
30
10
102
200
65
20
205
235
Ω
ms
mV
V
UVLO
t
DG
t
D,UVLO
Default value, V
S
and V
CC
increasing, Figure 1
(Note 2)
123
1.73
2.06
900
200
350
2.47
V
µs
ms
V
CC
V
S
I
CC
V
S
as defined in Figure 1
FET is fully enhanced, SC_DET = V
CC
2.25
1.05
1.5
13.2
V
CC
2.5
V
V
mA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
I
CB25
Circuit-Breaker Programming
Current
I
CB85
µA
TC = low (MAX5926),
MAX5925 (Note 5)
2
_______________________________________________________________________________________
1V to 13.2V, n-Channel Hot-Swap Controllers
Require No Sense Resistor
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
, EN (MAX5924/MAX5925), EN1 (MAX5926) = +2.25V to +13.2V;
EN2
(MAX5926) = 0V; V
S
(see Figure 1) = +1.05V to V
CC
; T
A
=
-40°C to +85°C, unless otherwise noted. Typical values are at V
CC
= 5V, RL = 500Ω from OUT to GND, CL = 1µF, SLEW = open, T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETER
Circuit-Breaker Programming
Current During Startup
Circuit-Breaker Enable Threshold
Circuit-Breaker Comparator
Offset Voltage
Fast Circuit-Breaker Offset
Resistor
Slow Circuit-Breaker Delay
Fast Circuit-Breaker Delay
Circuit-Breaker Trip Gate
Pulldown Current
Circuit-Breaker Temperature
Coefficient
OUT Current
MOSFET DRIVER
External Gate Drive
Load Voltage Slew Rate
Gate Pullup Current Capacity
ENABLE COMPARATOR
EN, EN1 Reference Threshold
EN, EN1 Hysteresis
EN, EN1 Input Bias Current
V
EN/UVLO
V
EN,HYS
I
EN
EN (MAX5924/MAX5925) = V
CC
,
EN1 (MAX5926) = V
CC
I
OL
= 1mA
PGOOD/PGOOD = 13.2V
VCB_EN
V
EN
(MAX5924/MAX5925) or
V
EN1
(MAX5926) rising
0.747
0.795
30
±8
±50
0.850
V
mV
nA
V
GS
SR
I
GATE
V
GATE
- V
OUT
2.25V
≤
V
CC
≤
13.2V
3.0
2.19
239
4.91
9.5
0.84
6.70
V
V/ms
µA
SLEW = open, C
GATE
= 10nF
C
SLEW
= 300nF, C
GATE
= 10nF (Note 8)
V
GATE
= 0V
SYMBOL
I
CB,SU
V
CB,EN
V
CB_OS
R
CBF
t
CBS
t
CBF
I
GATE,PD
TC
ICB
I
OUT
Figure 3
V
CB
- V
SENSE
= 10mV
V
CB
- V
SENSE
= 500mV
V
GATE
= 2.5V, V
CC
= 13.2V
MAX5924, TC = high (MAX5926)
MAX5925, TC = low (MAX5926)
13.5
1.2
0.95
V
GATE
- V
OUT
, rising gate voltage (Note 6)
2.3
CONDITIONS
MIN
TYP
2 x I
CB
3.6
0.3
1.9
1.6
280
27
0
3300
120
4.65
±4.7
2.7
2.95
MAX
UNITS
µA
V
mV
kΩ
ms
ns
mA
ppm/°C
µA
MAX5924/MAX5925/MAX5926
DIGITAL OUTPUTS (PGOOD,
PGOOD)
Power-Good Output Low Voltage
Power-Good Output Open-Drain
Leakage Current
Power-Good Trip Point
Power-Good Hysteresis
V
OL
I
OH
0.3
0.2
3.6
0.36
0.4
1
4.7
V
µA
V
V
V
THPGOOD
V
GATE
- V
OUT
, rising gate voltage
V
PG,HYS
_______________________________________________________________________________________
3
1V to 13.2V, n-Channel Hot-Swap Controllers
Require No Sense Resistor
MAX5924/MAX5925/MAX5926
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
, EN (MAX5924/MAX5925), EN1 (MAX5926) = +2.25V to +13.2V;
EN2
(MAX5926) = 0V; V
S
(see Figure 1) = +1.05V to V
CC
; T
A
=
-40°C to +85°C, unless otherwise noted. Typical values are at V
CC
= 5V, RL = 500Ω from OUT to GND, CL = 1µF, SLEW = open, T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETER
Autoretry Delay
Input Voltage
Input Bias Current
Time to Clear a Latched Fault
SYMBOL
t
RETRY
V
IH
V
IL
I
BIAS
T
CLR
Logic high at 13.2V
MAX5924A/ MAX5924B
MAX5925A/ MAX5925B
MAX5926 in latched mode
3
200
CONDITIONS
Autoretry mode
MIN
0.6
2.0
0.4
TYP
1.6
MAX
3.3
UNITS
s
V
µA
µS
LOGIC AND TIMING (TC, LATCH (MAX5926),
EN2
(MAX5926)
All devices are 100% tested at T
A
= +25°C and +85°C. All temperature limits at -40°C are guaranteed by design.
V
CC
drops 30% below the undervoltage lockout voltage during t
DG
are ignored.
R
LP
is the resistance measured between V
CC
and SC_DET during the load-probing phase, t
LP
.
Tested at +25°C & +85°C. Guaranteed by design at -40°C.
The circuit-breaker programming current increases linearly from V
CC
= 2.25V to 5V. See the Circuit-Breaker Current vs.
Supply Voltage graph in the
Typical Operating Characteristics.
Note 6:
See the
Startup Mode
section for more information.
Note 7:
V
GATE
is clamped to 17V (typ) above ground.
Note 8:
dv/dt = 330 x 10
-9
/C
SLEW
(V/ms), nMOS device used for measurement was IRF9530N. Slew rate is measured at the load.
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Typical Operating Characteristics
(V
CC
= 5V, C
L
= 1µF, C
SLEW
= 330nF, C
GATE
= 10nF, R
L
= 500Ω, Figure 1, T
A
= +25°C, unless otherwise noted.)
MAX5926 SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX5924 toc01
MAX5926 SUPPLY CURRENT
vs. TEMPERATURE
MAX5924 toc02
GATE-DRIVE VOLTAGE
vs. SUPPLY VOLTAGE
MAX5924 toc03
2.0
2.4
V
CC
= V
S
2.0
V
CC
= 13.2V
1.6
7
V
CC
= V
S
ENABLED
1.6
6
V
GATE
- V
S
(V)
I
CC
(mA)
I
CC
(mA)
1.2
DISABLED
5
1.2
V
CC
= 3.0V
0.8
V
CC
= 5.0V
V
S
= 1V
V
S
= 3V
V
S
= V
CC
V
S
= 5V
0.8
4
V
CC
= 2.25V
3
0.4
0.4
0
2
4
6
8
V
CC
(V)
10
12
14
-40
-15
10
35
TEMPERATURE (°C)
60
85
0
2
2
4
6
8
V
CC
(V)
10
12
14
4
_______________________________________________________________________________________
1V to 13.2V, n-Channel Hot-Swap Controllers
Require No Sense Resistor
Typical Operating Characteristics (continued)
(V
CC
= 5V, C
L
= 1µF, C
SLEW
= 330nF, C
GATE
= 10nF, R
L
= 500Ω, Figure 1, T
A
= +25°C, unless otherwise noted.)
MAX5924/MAX5925/MAX5926
GATE DRIVE VOLTAGE
vs. TEMPERATURE
MAX5924 toc04
CIRCUIT-BREAKER CURRENT
vs. HOT-SWAP VOLTAGE
MAX5924 toc05
CIRCUIT-BREAKER CURRENT
vs. SUPPLY VOLTAGE (TC = 3300ppm/°C)
V
CC
= V
S
MAX5924 toc06
6.0
V
CC
= V
S
5.5
V
CC
= 5.0V
5.0
V
GS
(V)
4.5
4.0
3.5
3.0
-40
-15
10
35
TEMPERATURE (°C)
60
V
CC
= 3.0V
56
TC = 3300ppm/°C
52
55
53
I
CB
(µA)
TC = 0ppm/°C
V
CC
= 13.2V
0
2
4
6
8
10
12
14
CB
(µ )
48
51
44
V
CC
= 13.2V
40
49
36
85
V
S
(V)
47
2
4
6
8
V
CC
(V)
10
12
14
CIRCUIT-BREAKER CURRENT
vs. SUPPLY VOLTAGE (TC = 0ppm/°C)
MAX5924 toc07
CIRCUIT-BREAKER PROGRAMMING
CURRENT vs. TEMPERATURE
MAX5924 toc08
SLEW RATE vs. C
SLEW
MAX5924 toc09
39.4
39.2
39.0
I
CB
(µA)
38.8
38.6
38.4
38.2
2
V
CC
= V
S
80
V
CC
= V
S
= 5V
70
60
I
CB
(µA)
TC = 3300ppm/°C
50
40
TC = 0ppm/°C
30
20
100
SLEW RATE (V/ms)
35
60
85
10
1
0.1
-40
-15
10
0
500
1000
C
SLEW
(nF)
1500
2000
TEMPERATURE (°C)
4
6
8
V
CC
(V)
10
12
14
_______________________________________________________________________________________
5
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