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PDF MAX5902 Data sheet ( Hoja de datos )
| Número de pieza | MAX5902 | |
| Descripción | +72V SOT23 Simple Swapper Hot-Swap Controllers | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-1988; Rev 1; 9/02
+72V SOT23 Simple Swapper Hot-Swap
Controllers
General Description
The MAX5902/MAX5903 are SOT23 hot-swap con-
trollers that allow a circuit card to be safely hot plugged
into a live backplane without causing a glitch on the
power-supply rail. These 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 overcur-
rent protection. During startup the circuit breaker func-
tion is disabled and the MAX5902/MAX5903 limit the
inrush current by gradually turning on the external
MOSFET. Once the external MOSFET is fully enhanced,
the circuit breaker function is enabled and the
MAX5902/MAX5903 provide overcurrent protection by
monitoring the voltage drop across the external MOS-
FET’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
case of overheating.
The MAX5902/MAX5903 offer latched or auto-retry fault
management and are available with 300mV, 400mV or
500mV circuit breaker thresholds. Both the MAX5902
and MAX5903 are available in a small SOT23 package,
and are specified for the extended -40°C to +85°C tem-
perature range. For specific ordering information refer
to the selector guide at the end of the data sheet.
Network Routers
Network Switches
Base Station Line
Cards
Applications
Servers
RAID
Industrial Systems
Pin Configuration
TOP VIEW
VS 1
6 ON/OFF
MAX5902
DRAIN 2 MAX5903 5 PGOOD (PGOOD)
Features
o Wide +9V to +72V Operation
o Requires No External Sense Resistor
o Drives External P-Channel MOSFET
o Limits Inrush Current
o Circuit Breaker Function
o Less than 2mA Quiescent Current
o ON/OFF Input Permits Load Power-Supply
Control and Sequencing
o Adjustable Undervoltage Lockout
o Power-Good Output with +72V Rating
o Latching or Automatic Retry Fault Management
o Thermal Shutdown Helps Protect the External
MOSFET
o Space-Saving SOT23-6 Package
Ordering Information
PART
MAX5902_ _EUT*
MAX5903_ _EUT*
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
6-SOT23
6-SOT23
*For specific part numbers see Selector Guide at end of data
sheet.
Typical Operating Circuits
BACKPLANE CIRCUIT CARD
IRFR5410
+48V
HOT-SWAP CONTROLLER
MAX5902
VS GATE
ON/OFF DRAIN
GND PGOOD
GND
50W ISOLATED
POWER SUPPLY
VIN (+)
LUCENT
JW050A1
ON/OFF
VIN (-)
GATE 3
4 GND
SOT23-6
( ) ARE FOR MAX5903 ONLY.
Typical Operating Circuits continued at end of data sheet.
Simple Swapper is a trademark of Maxim Integrated Products Inc.
________________________________________________________________ Maxim Integrated Products 1
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.
1 page  
+72V SOT23 Simple Swapper Hot-Swap
Controllers
PIN
MAX5902 MAX5903
11
22
33
44
5—
—5
66
Pin Description
NAME
VS
DRAIN
GATE
GND
PGOOD
PGOOD
ON/OFF
FUNCTION
Positive Supply Voltage Input and External P-Channel MOSFET Source Connection
Drain Sense Input for External P-Channel MOSFET. Connect DRAIN as close as
possible to the MOSFET’s drain and use wide circuit traces to assure good thermal
coupling between the MAX5902/MAX5903 and the MOSFET. See Layout Guidelines.
Gate Drive Output for External P-Channel MOSFET
Ground Connection
Power Good Output. PGOOD is an N-channel, open-drain, active-low output,
referenced to GND.
Power Good Output. PGOOD is an N-channel, open-drain, active-high output,
referenced to GND.
ON/OFF Control Input. ON/OFF is referenced to GND. Drive ON/OFF above 1.38V or
leave unconnected to enable the device. Drive ON/OFF below 1V to disable the device.
ON/OFF is also used to adjust the UVLO threshold. Internally clamped to nominally 3V
through a 1kΩ resistor. (See Figure 1.) (See Undervoltage Lockout in the Applications
section of this data sheet.)
Detailed Description
The MAX5902/MAX5903 are integrated hot-swap con-
troller ICs contained in 6-pin SOT23 packages. They
allow a board to be safely hot-plugged into a live back-
plane without causing a glitch on the power-supply rail.
They are well suited for +48V power systems allowing
cost-effective, simple, and compact design. The
MAX5902/MAX5903 operate from +9V to +72V to cover
a wide range of end equipment hot-swap needs. They
require only an external P-channel power MOSFET to
provide hot-swap control. Figure 1 shows a functional
block diagram of the MAX5902/MAX5903.
The MAX5902/MAX5903 controls an external P-channel
power MOSFET placed in the positive power-supply
pathway. When power is first applied, the MAX5902/
MAX5903 keep the MOSFET turned off. The
MAX5902/MAX5903 hold the MOSFET off indefinitely if
ON/OFF is held low, if the supply voltage is below the
undervoltage lockout level, or if the die temperature
exceeds +125°C. If none of these conditions exist for
150ms (typ), the MAX5902/MAX5903 begin to gradually
turn on the MOSFET. During this turn-on phase, the
MAX5902/MAX5903 slowly enhance the MOSFET,
allowing the voltage on the load, i.e. the drain of the
MOSFET, to rise at a rate of 9V/ms (typ). The inrush cur-
rent to the load is thus limited to a level proportional to
the load capacitance, and the constant slew rate. After
the MOSFET is fully enhanced, and the load voltage is
MAX5902
MAX5903
VS
*
828kΩ
ON/OFF
GND
1kΩ
*
34.5kΩ
3V
CONTROL
LOGIC
GND
*900kΩ
*650kΩ
PGOOD
(PGOOD)
GND
DRAIN
( ) ARE FOR THE MAX5903 ONLY
GATE
* RELATIVE TOLERANCE ±1%, ABSOLUTE TOLERANCE ±50% (TYP)
Figure 1. Functional Block Diagram
settled to its final value, the MAX5902A/ MAX5903A and
MAX5902L/MAX5903L monitor the voltage drop across
the MOSFET. If the voltage drop exceeds the circuit
breaker threshold the MAX5902A/MAX5903A and
MAX5902L/MAX5903L turn off the MOSFET, discon-
_______________________________________________________________________________________ 5
5 Page 
+72V SOT23 Simple Swapper Hot-Swap
Controllers
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information
go to www.maxim-ic.com/packages.)
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11
© 2002 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet MAX5902.PDF ] | |
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