MAX5902/MAX5903
+72V , SOT23/TDFN, Simple Swapper Hot-Swap
Controllers
________________________________________________________________Maxim Integrated Products
1
19-1988; Rev 3; 1/07
General Description
The MAX5902/MAX5903 are hot-swap controllers that allow a circuit card to be safely hot plugged into a live backplane without causing a glitch on the power-sup-ply rail. The devices operate from +9V to +72V and provide the simplest hot-swap solution by eliminating all external components except the external p-channel MOSFET.
The MAX5902/MAX5903 limit the inrush current to the load and provide a circuit-breaker function for overcurrent protection. During startup the circuit-breaker function is disabled and the MAX5902/MAX5903 limit the inrush cur-rent by gradually turning on the external MOSFET. Once the external MOSFET is fully enhanced, the circuit-break-er function is enabled and the MAX5902/MAX5903 pro-vide overcurrent protection by monitoring the voltage drop across the external MOSFET’s on-resistance.
The MAX5902/MAX5903 include an undervoltage lock-out (UVLO) function, ON/OFF control input, and a power-good status output, PGOOD (MAX5902) or PGOOD (MAX5903). A built-in thermal shutdown fea-ture is also included to protect the external MOSFET in ca of overheating.
The MAX5902/MAX5903 offer latched or autoretry fault management and are available with 300mV, 400mV or 500mV circuit-breaker thresholds. Both the MAX5902 and MAX5903 are available in small SOT23 and TDFN pack-ages, and are specified for the extended -40°C to +85°C temperature range. For specific ordering information, e the Selector Guide at the end of the data sheet.
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Applications
Network Routers Servers Network Switches RAID
Ba Station Line Industrial Systems
Cards
Features
♦Wide +9V to +72V Operation
♦Requires No External Sen Resistor ♦Drives External p-Channel MOSFET ♦Limits Inrush Current ♦Circuit-Breaker Function
♦Less than 2mA Quiescent Current ♦ON/OFF Input Permits Load Power-Supply Control and Sequencing ♦Adjustable Undervoltage Lockout ♦Power-Good Output with +72V Rating
♦Latching or Automatic Retry Fault Management ♦Thermal Shutdown Helps Protect the External MOSFET ♦Available in Two Small Packages 6-Pin TDFN and SOT23
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Ordering Information
Pin Configurations
Typical Operating Circuits
Simple Swapper is a trademark of Maxim Integrated Products, Inc.
For pricing, delivery, and ordering information,plea contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at
M A X 5902/M A X 5903
Controllers 2_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V S = +9V to +72V, GND = 0V, ON/OFF open circuit, T A = -40°C to +85°C, unless otherwi noted. Typical values are at V S = +48V and T
= +25°C.) (Notes 1, 2)Stress beyond tho listed under “Absolute Maximum Ratings” may cau permanent damage to the device. The are stress ratings only, and functional operation of the device at the or any other conditions beyond tho indicated in the operational ctions of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Terminal Voltage (with respect to GND unless otherwi noted)V S , DRAIN, PGOOD, PGOOD ................................-0.3V to +76V ON/OFF ....................................................................-0.3V to +4V GATE to V S ............................................................-12V to +0.3V Current into ±3mA
Continuous Power Dissipation (T A = +70°C)
6-Pin SOT23 (derate 9.1mW/°C above +70°C)..........727mW 6-Pin TDFN (derate 18.2mW/°C above +70°C).......1454mW Junction to Ca
Thermal Resistance, θJC (TDFN)..............................8.5°C/W Maximum .+150°C Storage -60°C to +150°C
MAX5902/MAX5903
Controllers
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GND, unless otherwi noted.
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Note 2:All specifications are 100% tested at T A = +25°C, unless otherwi noted. Specifications over -40°C to +85°C are guaran-teed by characterization.
Note 3:This is the delay time from a valid on condition until V GS begins rising. Valid on conditions are: the device is not in undervolt-age lockout; ON/OFF is not driven low; and the device is not in thermal shutdown.
Note 4:This is the delay from a valid low on ON/OFF until V GS falls. Puls on ON/OFF less than t OFF are ignored, offering glitch
immunity.
Note 5:Guaranteed by characterization, not production tested. C GATE is a capacitor from GATE to V S .
ELECTRICAL CHARACTERISTICS (continued)
(V S = +9V to +72V, GND = 0V, ON/OFF open circuit, T A = -40°C to +85°C, unless otherwi noted. Typical values are at V S = +48V and T A = +25°C.) (Notes 1, 2)
Typical Operating Characteristics
intranet(V S = +48V, GND = 0V, and T A = +25°C, unless otherwi noted. See Figure 2 for test circuits.)
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0.8
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30
15
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60
75
SUPPLY CURRENT vs. INPUT VOLTAGE
INPUT VOLTAGE (V)
S U P P L Y C U R R E N T (m A )
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1.0
0.9
1.11.2
-40ibear
10
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35
60
85
SUPPLY CURRENT vs. TEMPERATURE
TEMPERATURE (°C)
S U P P L Y C U R R E N T (m A )
25282726
29303132333435
-40
10
-15
35
60
85
V UVLO THRESHOLD vs. TEMPERATURE
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TEMPERATURE (°C)
L O C K O U T V O L T A G E (V )
Typical Operating Characteristics (continued)
(V S = +48V, GND = 0V, and T A = +25°C, unless otherwi noted. See Figure 2 for test circuits.)
M A X 5902/M A X 5903
Controllers 4
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57
11
9
13150
30
15
45
60
75
GATE DRIVE VOLTAGE vs. INPUT VOLTAGE
INPUT VOLTAGE (V)
G A T E D R I V E (V )
75
125100175150200225-4010-15356085
RETRY TIMEOUT vs. TEMPERATURE
M A X 5902 t o c 05
TEMPERATURE (°C)
T I M E O U T P E R I O D (m s )
t = 20ms/div
TURN-ON WAVEFORMS R L = 60Ω, C L = 100µF
A : V OUT , 50V/div
B : I IN , 1A/div
C : V GATE , 50V/div
D : V IN , 50V/div
A B D
C
MAX5902 toc06
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t = 2ms/div
TURN-ON WAVEFORMS R L = OPEN, C L = 100µF
A : V OUT , 50V/div
B : I IN , 1A/div
C : V GATE , 20V/div
A B C MAX5902 toc07
t = 1µs/div
CIRCUIT-BREAKER EVENT
V OVERDRIVE = 20mV, C GATE = 1000pF
A
B
C
MAX5902 toc10
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A : V DS , 0.5V/div
B : V GS , 10V/div
C : V PGOO
D TO V S , 50V/div t = 2ms/div
TURN-ON WAVEFORMS
R L = 60Ω, C L = 10µF A : V OUT , 50V/div B : I IN , 0.5A/div C : V GATE , 20V/div A
B C MAX5902 toc08
t = 1µs/div
CIRCUIT-BREAKER EVENT
V OVERDRIVE = 200mV, C GATE = 1000pF
A
B
C
MAX5902 toc11
00
0A : V DS , 0.5V/div B : V GS , 10V/div
C : V TO V S , 50V/div
t = 2ms/div
determinationTURN-ON WAVEFORMS
R L = 60Ω, C L = 100µF A : V OUT , 50V/div B : I IN , 1A/div C : V GATE , 20V/div
A
B C MAX5902 toc09
MAX5902/MAX5903Controllers
M A X 5902/M A X 5903
Controllers
6
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MAX5902L/MAX5903L turn off the MOSFE T, discon-necting the load immediately. If no circuit-breaker fault exists, the MAX5902/MAX5903 asrt the power-good output. Then, if any of four conditions exist, the power-good output deasrts and the MAX5902/MAX5903turn off the MOSFET. The four conditions are: the volt-age across the MOSFE T exceeds the circuit-breaker threshold; the supply voltage falls below the undervolt-age lockout level; the die temperature exceeds +125°C; or ON/OFF is forced low. After a circuit-break-er fault, the MAX5902L/MAX5903L keep the MOSFE T off until the power is cycled, or the part is ret by tog-gling ON/OFF low for 10ms (typ). After a circuit-breaker fault, the MAX5902A/MAX5903A automatically restarts in 150ms (typ). All versions automatically restart after a
thermal fault, or an undervoltage shutdown, if the fault condition goes away for at least 150ms (typ).
ON/OFF offers external control of the MAX5902/MAX5903, facilitating power-supply quencing, and may also be ud to change the undervoltage lockout (UVL) level. UVLO keeps the external MOSFE T switched off as long as the input voltage is below the desired level.
A power-good output, PGOOD (MAX5902) or PGOOD (MAX5903), asrts when the external MOSFET is fully enhanced and the source-drain voltage is below the circuit-breaker threshold. PGOOD and PGOOD are open-drain outputs referenced to GND, and can with-stand up to +72V.
Figure 2. Test Circuits
