19-1988; Rev 3; 8/03
-100V SOT23 Simple Swapper Hot-Swap
Controllers
General Description
Features
The MAX5900/MAX5901 are SOT23 hot-swap controllers
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
-100V and provide the simplest hot-swap solution by
eliminating all external components except an external
N-channel MOSFET.
o Wide -9V to -100V Operation
o Requires No External Sense Resistor
o Drives External N-Channel MOSFET
o Limits Inrush Current
o Circuit Breaker Function
The MAX5900/MAX5901 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 MAX5900/MAX5901 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 MAX5900/MAX5901 pro-
vide overcurrent protection by monitoring the voltage
drop across the external MOSFET’s on-resistance.
o Less than 1mA Quiescent Current
o ON/OFF Input Permits Load Power-Supply
Control and Sequencing
o Adjustable Undervoltage Lockout
o Power-Good Output with 100V Rating
o Latching or Automatic Retry Fault Management
o Thermal Shutdown Helps Protect the External
The MAX5900/MAX5901 include an undervoltage lock-
out (UVLO) function, ON/OFF control input, and a power-
good status output, PGOOD (MAX5900) or PGOOD
(MAX5901). A built-in thermal shutdown feature is also
included to protect the external MOSFET in case of over-
heating.
MOSFET
o Space-Saving 6-Pin SOT23 Package
Ordering Information
The MAX5900/MAX5901 offer latched or autoretry fault
management and are available with 200mV, 300mV, or
400mV circuit breaker thresholds. Both the MAX5900 and
MAX5901 are available in small SOT23 packages, and
are specified for the extended -40°C to +85°C tempera-
ture range. For specific ordering information see the
Selector Guide at the end of the data sheet.
PART
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
MAX5900_ _EUT-T*
MAX5901_ _EUT-T*
6 SOT23-6
6 SOT23-6
*For specific part numbers, see Selector Guide at end of data
sheet.
_________________________Applications
Pin Configuration
Telecom Line Cards
Network Switches
o Requires No External Sense Resistor
Network Routers
Servers
TOP VIEW
Base-Station Line
Cards
V
1
2
3
6
5
4
ON/OFF
EE
Typical Operating Circuits
MAX5900
MAX5901
DRAIN
GATE
PGOOD (PGOOD)
GND
50W ISOLATED
POWER SUPPLY
BACKPLANE
GND
CIRCUIT CARD
HOT-SWAP CONTROLLER
V +
1
LUCENT
JWO50A1
MAX5900
SOT23-6
( ) ARE FOR MAX5901 ONLY.
ON/OFF
GND
PGOOD
DRAIN
GATE
ON/OFF
V
EE
V -
1
Typical Operating Circuits continued at end of data sheet.
-48V
IRF540NS
FUSE
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.