MAX5948A_11 Datasheet, PDF (1/18 Pages) Maxim Integrated Products – -48V Hot-Swap Controllers with External RSENSE

19-3473; Rev 1; 8/11
-48V Hot-Swap Controllers
with External R_SENSE
General Description
The MAX5948A/MAX5948B are hot-swap controllers
that allow a circuit card to be safely hot plugged into a
live backplane. The MAX5948A/MAX5948B operate
from -20V to -80V and are well-suited for -48V power
systems. The MAX5948A is pin- and function-compati-
ble with both the LT1640AL and LT1640L. The
MAX5948B is pin- and function-compatible with both
the LT1640AH and LT1640H.
The MAX5948A/MAX5948B provide a controlled turn-on
to circuit cards preventing glitches on the power-supply
rail and damage to board connectors and components.
The MAX5948A/MAX5948B 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 MAX5948A and MAX5948B protect a system
against overcurrent and short-circuit conditions by turning
off the external MOSFET in the event of a fault condition.
Both devices feature an open-drain power-good status
output, PWRGD for MAX5948A or PWRGD for
MAX5948B, that can be used to enable downstream
converters.
The MAX5948A/MAX5948B are available in an 8-pin SO
package. Both devices are specified for the extended
-40°C to +85°C temperature range.
Applications
Central-Office Switching
Network Switches/Routers
Server Line Cards
Base-Station Line Cards
Features
o Allow Safe Board Insertion and Removal from a
Live -48V Backplane
o Pin- and Function-Compatible with
LT1640AL/LT1640L (MAX5948A)
o Pin- and Function-Compatible with
LT1640AH/LT1640H (MAX5948B)
o Withstand -100V Input Transients with No
External Components
o Operate from -20V to -80V
o Programmable Inrush and Short-Circuit Current
Limits
o Programmable Overvoltage Protection
o Programmable Undervoltage Lockout
o Power Up into a Shorted Load
o Power-Good Control Output
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX5948AESA+ -40°C to +85°C 8 SO
MAX5948BESA+ -40°C to +85°C 8 SO
+Denotes a lead(Pb)-free/RoHS-compliant package.
PART
MAX5948AESA
MAX5948BESA
Selector Guide
PWRGD POLARITY
Active Low (PWRGD)
Active High (PWRGD)
Pin Configuration
TOP VIEW
PWRGD
(PWRGD) ¹
OV 2
UV 3
V_EE 4
MAX5948A
MAX5948B
8 V_DD
7 DRAIN
6 GATE
5 SENSE
Typical Operating Circuit appears at end of data sheet.
SO
( ) FOR MAX5948B.
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