MAX5924 Datasheet, PDF (1/20 Pages) Maxim Integrated Products – 1V to 13.2V, n-Channel Hot-Swap Controllers Require No Sense Resistor

19-3443; Rev 0; 10/04
1V to 13.2V, n-Channel Hot-Swap Controllers
Require No Sense Resistor
General Description
The MAX5924/MAX5925/MAX5926 1V to 13.2V hot-swap
controllers allow the safe insertion and removal of circuit
cards into live backplanes. These devices hot swap sup-
plies ranging from 1V to 13.2V provided that the device
supply voltage, V_CC, is at or above 2.25V and the hot-
swapped supply, V_S, does not exceed V_CC.
The MAX5924/MAX5925/MAX5926 hot-swap controllers
limit the inrush current to the load and provide a circuit-
breaker function for overcurrent protection. The devices
operate with or without a sense resistor. When operat-
ing without a sense resistor, load-probing circuitry
ensures a short circuit is not present during startup,
then gradually turns on the external MOSFET. After the
load probing is complete, on-chip comparators provide
overcurrent protection by monitoring the voltage drop
across the external MOSFET on-resistance. In the event
of a fault condition, the load is disconnected.
The MAX5924/MAX5925/MAX5926 include many inte-
grated features that reduce component count and
design time, including programmable turn-on voltage,
slew rate, and circuit-breaker threshold. An on-board
charge pump provides the gate drive for a low-cost,
external n-channel MOSFET.
The MAX5924/MAX5925/MAX5926 are available with
open-drain PGOOD and/or PGOOD outputs. The
devices also feature a circuit breaker with temperature-
compensated R_DS(ON) sensing. The MAX5926 features
a selectable 0ppm/°C or 3300ppm/°C temperature coef-
ficient. The MAX5924 temperature coefficient is
0ppm/°C and the MAX5925 temperature coefficient is
3300ppm/°C. Autoretry and latched fault-management
configurations are available (see the Selector Guide).
Base Stations
Applications
RAID
Remote-Access Servers
Network Routers and Switches
Servers
Portable Device Bays
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Features
♦ Hot Swap 1V to 13.2V with V_CC ≥ 2.25V
♦ Drive High-Side n-Channel MOSFET
♦ Operation With or Without R_SENSE
♦ Protected During Turn-On into Shorted Load
♦ Circuit-Breaker Threshold Adjustable Down to
10mV
♦ Programmable Slew-Rate Control
♦ Circuit Breaker with Temperature-Compensated
R_DS(ON) Sensing
♦ Programmable Turn-On Voltage
♦ Autoretry or Latched Fault Management
♦ 10-Pin µMAX^ or 16-Pin QSOP Packages
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX5924AEUB
-40°C to +85°C
10 µMAX
MAX5924BEUB* -40°C to +85°C
10 µMAX
MAX5924CEUB* -40°C to +85°C
10 µMAX
MAX5924DEUB* -40°C to +85°C
10 µMAX
MAX5925AEUB
-40°C to +85°C
10 µMAX
MAX5925BEUB* -40°C to +85°C
10 µMAX
MAX5925CEUB* -40°C to +85°C
10 µMAX
MAX5925DEUB* -40°C to +85°C
10 µMAX
MAX5926EEE*
-40°C to +85°C
16 QSOP–EP**
*Future product—contact factory for availability.
**EP = Exposed pad.
Typical Operating Circuits
BACKPLANE
V_S
V_CC
GND
TYPICAL OPERATION WITHOUT R_SENSE
REMOVABLE CARD
1V TO V_CC
N
2.25V TO 13.2V
R_CB
V_OUT
R_SC
CB GATE SENSE OUT
V_CC
SC_DET
MAX5925
GND MAX5926
Selector Guide appears at end of data sheet.
Pin Configurations appear at end of data sheet.
SEE FIGURE 1 FOR A DETAILED TYPICAL OPERATING CIRCUIT WITHOUT RSENSE.
Typical Operating Circuits continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
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