General Description
The MAX5900/MAX5901 are SOT23/TDFN 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
-100V and provide the simplest hot-swap solution by
eliminating all external components except an external
n-channel MOSFET.
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 MOSFETs on-resistance.
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.
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 and TDFN pack-
ages, and are specified for the extended -40癈 to +85癈
temperature range. For specific ordering information see
the Selector Guide at the end of the data sheet.
_________________________Applications
f Requires No External Sense Resistor
Features
f Wide -9V to -100V Operation
f Requires No External Sense Resistor
f Drives External N-Channel MOSFET
f Limits Inrush Current
f Circuit-Breaker Function
f Less than 1mA Quiescent Current
f ON/OFF Input Permits Load Power-Supply
Control and Sequencing
f Adjustable Undervoltage Lockout
f Power-Good Output with 100V Rating
f Latching or Automatic Retry Fault Management
f Thermal Shutdown Helps Protect the External
MOSFET
f Space-Saving 6-Pin SOT23 and TDFN Packages
-100V, SOT23/TDFN, Simple Swapper
Hot-Swap Controllers
________________________________________________________________ Maxim Integrated Products   1
DRAIN
GND
( ) ARE FOR MAX5901 ONLY.
GATE
1
6   ON/OFF
5   PGOOD (PGOOD)
V
EE
MAX5900
MAX5901
SOT23
TOP VIEW
2
3
4
Pin Configurations
MAX5900
V
EE
ON/OFF
HOT-SWAP CONTROLLER
GND
-48V
50W ISOLATED
POWER SUPPLY
V
1
-
ON/OFF
LUCENT
JWO50A1
V
1
+
GATE
DRAIN
PGOOD
IRF540NS
GND
BACKPLANE
CIRCUIT CARD
FUSE
Typical Operating Circuits
19-2077; Rev 5; 1/07
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxims website at www.maxim-ic.com.
Ordering Information
PART
TEMP RAN  E
PIN-
PACKAGE
PKG
DE
MAX
E  T+T*  -40癈 to +85癈  6 SOT23-6
U6F-6
MAX
ETT+T*   -40癈 to +85癈  6 TDFN-EP**   T633-2
MAX
1    E  T+T*  -40?/SPAN>C to +85?/SPAN>C  6 SOT23-6
U6F-6
MAX
1    ETT+T*   -40癈 to +85癈  6 TDFN-EP**   T633-2
*For specific part numbers, see Selector Guide at end of data
sheet.
+Denotes lead-free package.
**EP = Exposed pad.
Typical Operating Circuits continued at end of data sheet.
Simple Swapper is a trademark of Maxim Integrated Products, Inc.
Telecom Line Cards
Network Routers
Base-Station Line
Cards
Network Switches
Servers
Pin Configurations continued at end of data sheet.