19-6083; Rev 0; 12/11
MAX34565
12V Hot-Plug Switch in TDFN Package
General Description
The MAX34565 is a hot-plug controller for 12V power
rails. It is a completely integrated solution including the
required power-pass MOSFET device for 12V supplies.
During hot-plug, the device controls the supply output
voltage ramp (dV/dt) and limits the current at a user-
controlled level. The device also limits the output voltage
to protect downstream devices from overvoltage events.
The MAX34565 is offered in a latchoff version.
Features
S CompletelyIntegratedHot-PlugFunctionalityfor
12VPowerRails
S On-BoardPowerMOSFET
S NoHighPowerR
SENSE
ResistorNeeded
S AdjustableCurrentLimit
S AdjustableOutputVoltageSlewRate
S ThermalFaultIndication
S OutputOvervoltageLimiting
S On-BoardThermalProtection
S On-BoardChargePump
S LatchoffVersion
Applications
RAID/Hard Drives
Servers
Switches/Routers
PCI/PCI Express
®
InfiniBand
TM/SM
Base Stations
Ordering Information
appears at end of data sheet.
Functional Diagram
+12V
SUPPLY
V
CC
UVLO
5V
REG
CHARGE
PUMP
68mΩ
LOAD
ILIM
CURRENT
LIMIT
R
ILIM
+12V
LOAD
MAX34565
OVERVOLTAGE
LIMIT
GND
VRAMP
V
OHT
17µA
EN/FAULT
1.4V
POR
BLANKING
THERMAL
LIMIT
C
VRAMP
V
OLT
THERMAL RESET
PCI Express is a registered service mark of PCI-SIG Corp.
InfiniBand is a trademark and service mark of InfiniBand Trade Association.
For related parts and recommended products to use with this part, refer to:
www.maxim-ic.com/MAX34565.related
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Integrated Products
1
½
Forpricing,delivery,andorderinginformation,pleasecontactMaximDirectat1-888-629-4642,
orvisitMaxim’swebsiteatwww.maxim-ic.com.
MAX34565
12V Hot-Plug Switch in TDFN Package
ABSOLUTEMAXIMUMRATINGS
(All voltages relative to GND.)
Voltage Range on V
CC
Continuous .........................................................-0.3V to +18V
1ms ....................................................................-0.3V to +22V
Voltage Range on ILIM, VRAMP .............. -0.3V to (V
CC
+ 0.3V),
not to exceed +18V
Voltage on EN/FAULT .............................................-0.3V to +6V
12V Drain Current (T
A
= +25NC, 0.5sq in. pad) .. 3.6A (continuous)
Continuous Power Dissipation (T
A
= +70NC)
TDFN (derate at 24.4mW/NC above +70NC)...........1951.2mW
Operating Junction Temperature ..................... -40NC to +150NC
Storage Temperature Range .......................... -55NC to +150NC
Lead Temperature (soldering, 10s) ................................+300NC
Soldering Temperature (reflow) ......................................+260NC
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional opera-
tion 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.
RECOMMENDEDOPERATINGCONDITIONS
(T
J
= -40NC to +150NC, unless otherwise noted.)
PARAMETER
V
CC
Voltage
R
ILIM
Value
EN/FAULT Low Level (LOAD
Disabled)
EN/FAULT High Level (LOAD
Enabled)
SYMBOL
V
CC
R
ILIM
V
OLT
V
OHT
3.3
(Notes 1, 2)
CONDITIONS
MIN
9
12
TYP
12
MAX
13.2
30
0.80
UNITS
V
I
V
V
ELECTRICALCHARACTERISTICS
(V
CC
= 12V, T
J
= +25NC, unless otherwise noted.)
PARAMETER
Supply Current
UVLO Rising
UVLO Falling
UVLO Hysteresis
On-Resistance
MOSFET Output Capacitance
Shutdown Junction Temperature
Thermal Hysteresis
Overvoltage Clamp
Power-On Short-Circuit Current
Limit (Kelvin Sense)
Operating Overload Current Limit
(Kelvin Sense)
VRAMP Time
(0V to 12V)
SYMBOL
I
CC
V
UR
V
UF
V
UH
R
ON
C
OUT
T
SHDN
T
HYS
V
OVC
I
SCL
I
OVL
R
ILIM
= 15.4I (Note 4)
R
ILIM
= 24.9I
R
ILIM
= 15.4I
R
ILIM
= 24.9I
C
VRAMP
= 270pF
t
VRAMP
C
VRAMP
= 470pF
C
VRAMP
= 1000pF
13.5
2.75
(Note 4)
+140
(Note 3)
7.5
6.5
CONDITIONS
MIN
TYP
1.6
8.0
7.0
1
68
400
+155
40
15
3.44
2.1
4.6
3.5
7
12
25
16.5
4.25
+175
88
MAX
2.25
8.5
7.5
UNITS
mA
V
V
V
mI
pF
NC
NC
V
A
A
A
A
ms
ms
ms
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Integrated Products
2
½
MAX34565
12V Hot-Plug Switch in TDFN Package
ELECTRICALCHARACTERISTICS(continued)
(V
CC
= 12V, T
J
= +25NC, unless otherwise noted.)
PARAMETER
EN/FAULT Fault Output Voltage
SYMBOL
V
FAULT
CONDITIONS
MIN
0.82
TYP
MAX
1.95
UNITS
V
Note1:
All voltages are referenced to ground. Currents entering the device are specified positive, and currents exiting the device
are negative.
Note2:
This supply range guarantees that the LOAD voltage is not clamped by the overvoltage limit.
Note3:
Supply current specified with no load on the LOAD pin.
Note4:
Guaranteed by design; not production tested.
Typical Operating Characteristics
(V
CC
= 12V, T
J
= +25°C, unless otherwise noted.)
CURRENT LIMIT vs. R
ILIM
MAX34565 toc01
CURRENT LIMIT vs. TEMPERATURE
MAX34565 toc02
CURRENT LIMIT vs. TEMPERATURE
4.0
3.5
CURRENT LIMIT (A)
3.0
2.5
2.0
1.5
1.0
0.5
0
5.5
5.0
4.5
CURRENT LIMIT (A)
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
12
15
18
21
R
ILIM
= 15Ω
I
OVL
R
ILIM
= 24Ω
I
OVL
5
CURRENT LIMIT (A)
4
3
2
1
0
I
OVL
I
SCL
I
SCL
I
SCL
24
27
30
-40 -20
0
20
40
60
80 100 120
-40 -20
0
20
40
60
80 100 120
R
ILIM
(Ω)
TEMPERATURE (°C)
TEMPERATURE (°C)
OVERVOLTAGE CLAMP vs. TEMPERATURE
MAX34565 toc04
ON-RESISTANCE vs. TEMPERATURE
MAX34565 toc05
SUPPLY CURRENT vs. TEMPERATURE
1.8
1.6
1.4
I
CC
(mA)
1.2
1.0
0.8
0.6
0.4
0.2
0
MAX34565 toc06
16.2
16.0
OVERVOLTAGE CLAMP (V)
15.8
15.6
15.4
15.2
15.0
14.8
-40 -20
0
20
40
60
80 100 120
TEMPERATURE (°C)
80
70
60
R
ON
(mΩ)
50
40
30
20
2.0
NO LOAD
10Ω LOAD
10
0
-40 -20
0
20
40
60
80 100 120
TEMPERATURE (°C)
-40 -20
0
20
40
60
80 100 120
TEMPERATURE (°C)
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Integrated Products
3
½
MAX34565 toc03
6.0
6
4.5
MAX34565
12V Hot-Plug Switch in TDFN Package
Typical Operating Characteristics (continued)
(V
CC
= 12V, T
J
= +25°C, unless otherwise noted.)
TURN-ON WAVEFORMS
(V
CC
= 12V, EN/FAULT)
TURN-ON WAVEFORMS
(V
CC
= 12V, 10Ω RESISTIVE LOAD)
R
ILIM
= 15Ω
2V/div
MAX34565 toc07
MAX34565 toc08
V
CC
2V/div
V
CC
LOAD
LOAD
500mA/div
EN/FAULT
LOAD CURRENT
5ms/div
5ms/div
TURN-ON WAVEFORMS
(V
CC
= 12V, 3300µF CAPACITIVE LOAD)
MAX34565 toc09
R
ILIM
= 15Ω
2V/div
V
CC
LOAD
1A/div
LOAD CURRENT
5ms/div
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Integrated Products
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MAX34565
12V Hot-Plug Switch in TDFN Package
Pin Configuration
TOP VIEW
LOAD LOAD LOAD LOAD LOAD
10
9
8
7
6
MAX34565
+
1
2
3
V
CC
/EP
4
5
N.C.
GND VRAMP EN/ ILIM
FAULT
TDFN
(3mm x 3mm)
Pin Description
PIN
1
2
NAME
GND
VRAMP
Ground Connection
Voltage Ramp Control. A capacitor connected to this pin determines the voltage ramp of the LOAD
output during turn-on according to the equation t
VRAMP
= 25E6 x C
VRAMP
for voltage ramp from 0
to 12V. This pin can be left open circuit for a minimum ramp time.
Enable/Fault. This pin is a multiple function digital input-output pin. When this pin is externally pulled
low, the MOSFET is turned off. When this pin is left open or not externally driven, the internal pullup
reference pulls the input high, and the MOSFET is allowed to turn on. Note: Do not use an
external pullup on this pin. If the device experiences a thermal fault, this pin becomes an output that
is pulled internally to a mid-level voltage, V
FAULT
.
Supply Current Limit Adjust. A resistor from this pin to LOAD determines the current limit for the
pass connection.
No Connection. Do not connect any signal to this pin.
FUNCTION
3
EN/FAULT
4
5
6
7
8
9
10
—
ILIM
N.C.
LOAD
Load Output. N-channel power MOSFET source connection.
V
CC
/EP
12V Supply Input/Exposed Pad. Power-supply input and n-channel power MOSFET drain connec-
tion. Should be connected to a large trace or plane. The EP also acts as a heatsink, and can
dissipate heat from the device.
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