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PDF MAX5900 Data sheet ( Hoja de datos )
| Número de pieza | MAX5900 | |
| Descripción | -100V SOT23 Simple Swapper Hot-Swap Controllers | |
| Fabricantes | Maxim Integrated | |
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19-1988; Rev 3; 8/03
-100V SOT23 Simple Swapper Hot-Swap
Controllers
General Description
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.
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.
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 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.
_________________________Applications
o ReTqeuleicreosmNLoinEexCtearndasl Sense RNeestiwsotorkr Switches
Network Routers
Servers
Base-Station Line
Cards
Typical Operating Circuits
BACKPLANE CIRCUIT CARD
GND
HOT-SWAP CONTROLLER
MAX5900
GND PGOOD
ON/OFF DRAIN
VEE GATE
-48V
FUSE
IRF540NS
50W ISOLATED
POWER SUPPLY
V1+
LUCENT
JWO50A1
ON/OFF
V1-
Features
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
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
MOSFET
o Space-Saving 6-Pin SOT23 Package
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX5900_ _EUT-T*
MAX5901_ _EUT-T*
-40°C to +85°C
-40°C to +85°C
6 SOT23-6
6 SOT23-6
*For specific part numbers, see Selector Guide at end of data
sheet.
Pin Configuration
TOP VIEW
VEE 1
6 ON/OFF
MAX5900
DRAIN 2 MAX5901 5 PGOOD (PGOOD)
GATE 3
4 GND
SOT23-6
( ) ARE FOR MAX5901 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  
-100V SOT23 Simple Swapper Hot-Swap
Controllers
PIN
MAX5900
MAX5901
11
22
33
44
5—
—5
66
NAME
VEE
DRAIN
GATE
GND
PGOOD
PGOOD
ON/OFF
Pin Description
FUNCTION
Negative Supply Voltage Input and External N-Channel MOSFET Source
Connection
Drain Sense Input for External N-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 MAX5900/MAX5901 and the MOSFET (aee Layout
Guidelines).
Gate Drive Output for External N-Channel MOSFET
Ground Connection.
Power-Good Output. PGOOD is an N-channel, open-drain, active-low output,
referenced to VEE.
Power-Good Output. PGOOD is an N-channel, open-drain, active-high output,
referenced to VEE.
ON/OFF Control Input. ON/OFF is referenced to VEE. 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. See Under-
voltage Lockout in the Applications Information section of this datasheet.
Internally clampted to nominally 3V through a 1kΩ resistor (see Figure 1).
Detailed Description
The MAX5900/MAX5901 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 telecom power systems,
allowing a cost-effective, simple, and compact design.
The MAX5900/MAX5901 operate from -9V to -100V to
cover the standard telecom voltage range, and to serve
more generalized applications. These devices require
only an external N-channel power MOSFET to provide
hot-swap control. Figure 1 shows a functional diagram
of the MAX5900/MAX5901.
The MAX5900/MAX5901 control an external N-channel
power MOSFET placed in the negative power-supply
pathway. When power is first applied, the MAX5900/
MAX5901 keep the MOSFET turned off. The
MAX5900/MAX5901 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
300ms (typ), the MAX5900/MAX5901 begin to gradually
turn on the MOSFET. During this turn-on phase, the
MAX5900/MAX5901 slowly enhance the MOSFET,
allowing the voltage on the load, i.e. the drain of the
MOSFET, to fall no faster than 10V/ms (typ). The inrush
GND
828kΩ*
MAX5900
MAX5901
ON/OFF
VEE
1kΩ*
34.5kΩ*
3V
CONTROL
LOGIC
PGOOD
(PGOOD)
N
VEE VEE
466kΩ*
GATE DRAIN
( ) ARE FOR THE MAX5901 ONLY.
* RELATIVE TOLERANCE ±1%, ABSOLUTE TOLERANCE ±20% TYPICAL.
Figure 1. Functional Diagram
_______________________________________________________________________________________ 5
5 Page 
-100V 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.)
PACKAGE OUTLINE, SOT-23, 6L
21-0058
F
1
1
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
© 2003 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet MAX5900.PDF ] | |
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