MAX5920 Datasheet, PDF (1/18 Pages) Maxim Integrated Products – -48V Hot-Swap Controller with External RSENSE

19-2931; Rev 0; 8/03
-48V Hot-Swap Controller
with External R_SENSE
General Description
The MAX5920A/MAX5920B are hot-swap controllers that
allow a circuit card to be safely hot plugged into a live
backplane. The MAX5920A/MAX5920B operate from
-20V to -80V and are well-suited for -48V power systems.
These devices are pin and function compatible with the
LT4250 and pin compatible with the LT1640.
The MAX5920A/MAX5920B provide a controlled turn-on
to circuit cards preventing glitches on the power-supply
rail and damage to board connectors and components.
The MAX5920A/MAX5920B provide undervoltage, over-
voltage, and overcurrent protection. These devices
ensure the input voltage is stable and within tolerance
before applying power to the load.
Both the MAX5920A and MAX5920B protect a system
against overcurrent and short-circuit conditions by turn-
ing off the external MOSFET in the event of a fault con-
dition. The MAX5920A/MAX5920B also provide
protection against input voltage steps. During an input
voltage step, the MAX5920A/MAX5920B limit the cur-
rent drawn by the load to a safe level without turning off
power to the load.
Both devices feature an open-drain power-good status
output (PWRGD for the MAX5920A or PWRGD for the
MAX5920B) that can be used to enable downstream
converters. A built-in thermal-shutdown feature is also
included to protect the external MOSFET in case of
overheating.
The MAX5920A/MAX5920B are available in an 8-pin SO
package. Both devices are specified for the extended
-40°C to +85°C temperature range.
Applications
Telecom Line Cards
Network Switches/Routers
Central-Office Line Cards
Server Line Cards
Base-Station Line Cards
Features
o Allows Safe Board Insertion and Removal
from a Live -48V Backplane
o Pin- and Function-Compatible with LT4250L
(MAX5920A)
o Pin-Compatible with LT1640L (MAX5920A)
o Pin- and Function-Compatible with LT4250H
(MAX5920B)
o Pin-Compatible with LT1640H (MAX5920B)
o Circuit-Breaker Immunity to Input Voltage Steps
and Current Spikes
o Withstands -100V Input Transients with No
External Components
o Programmable Inrush and Short-Circuit Current
Limits
o Operates from -20V to -80V
o Programmable Overvoltage Protection
o Programmable Undervoltage Lockout
o Powers Up into a Shorted Load
o Power-Good Control Output
o Thermal Shutdown Protects External MOSFET
PART
MAX5920AESA
MAX5920BESA
Ordering Information
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 SO
8 SO
TOP VIEW
Pin Configuration
Typical Operating Circuit and Selector Guide appear at end
of data sheet.
PWRGD
(PWRGD) ¹
OV 2
UV 3
V_EE 4
MAX5920A
MAX5920B
8 V_DD
7 DRAIN
6 GATE
5 SENSE
SO
( ) FOR MAX5920B.
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