19-3443; Rev 0; 10/04
1V to 13.2V, n-Channel Hot-Swap Controllers
Require No Sense Resistor
General Description
Features
♦ Hot Swap 1V to 13.2V with V
♦ Drive High-Side n-Channel MOSFET
♦ Operation With or Without R
≥ 2.25V
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
CC
SENSE
♦ Protected During Turn-On into Shorted Load
♦ Circuit-Breaker Threshold Adjustable Down to
supply voltage, V , is at or above 2.25V and the hot-
CC
S
swapped supply, V , does not exceed V
.
CC
10mV
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.
♦ Programmable Slew-Rate Control
♦ Circuit Breaker with Temperature-Compensated
RDS(ON) Sensing
♦ Programmable Turn-On Voltage
♦ Autoretry or Latched Fault Management
♦ 10-Pin µMAX or 16-Pin QSOP Packages
Ordering Information
PART
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
10 µMAX
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.
MAX5924AEUB
MAX5924BEUB*
MAX5924CEUB*
MAX5924DEUB*
MAX5925AEUB
MAX5925BEUB*
MAX5925CEUB*
MAX5925DEUB*
MAX5926EEE*
10 µMAX
10 µMAX
10 µMAX
10 µMAX
The MAX5924/MAX5925/MAX5926 are available with
open-drain PGOOD and/or PGOOD outputs. The
devices also feature a circuit breaker with temperature-
10 µMAX
10 µMAX
compensated R
sensing. The MAX5926 features
10 µMAX
DS(ON)
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).
16 QSOP–EP**
*Future product—contact factory for availability.
**EP = Exposed pad.
Typical Operating Circuits
Applications
TYPICAL OPERATION WITHOUT R
SENSE
Base Stations
BACKPLANE
REMOVABLE CARD
N
RAID
V
1V TO V
OUT
CC
V
S
2.25V TO 13.2V
Remote-Access Servers
Network Routers and Switches
Servers
V
CC
R
CB
R
SC
OUT
CB
GATE SENSE
Portable Device Bays
SC_DET
V
CC
MAX5925
MAX5926
GND
GND
µMAX is a registered trademark of Maxim Integrated Products, Inc.
SEE FIGURE 1 FOR A DETAILED TYPICAL OPERATING CIRCUIT WITHOUT R
.
SENSE
Selector Guide appears at end of data sheet.
Pin Configurations appear at end of data sheet.
Typical Operating Circuits continued at end of data sheet.
________________________________________________________________ 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.