Datasheet
General Description
The MAX5933A–MAX5933F/MAX5947A/B/C fully integrat-
ed hot-swap controllers for +9V to +80V positive supply
rails (MAX5947A/B/C), allow for the safe insertion and
removal of circuit cards into live backplanes without caus-
ing glitches on the backplane power-supply rail. The
MAX5947B is pin- and function-compatible with the
LT1641-2. The other devices offer added features such
as a choice of active-high or active-low power-good out-
puts (PWRGD/PWRGD), latched/autoretry fault manage-
ment, and autoretry duty-cycle options of 3.75% or 0.94%
(see the Selector Guide).
The MAX5933A–MAX5933F are available with a default
undervoltage lockout threshold of +31V and operate over
a supply voltage range of +33V to +80V. The
MAX5947A/B/C are available with a default undervoltage
of +8.3V. All devices feature a programmable analog
foldback current limit. If the device remains in current limit
for more than a programmable time, the external
n-channel MOSFET is either latched off (MAX5933A/
MAX5933C/MAX5947A) or is set to automatically restart
after a timeout delay (MAX5933B/MAX5933D/MAX5933E/
MAX5933F/MAX5947B/MAX5947C).
The MAX5933_ and MAX5947_ operate in the extended
temperature range of -40°C to +85°C. These devices are
available in an 8-pin SO package.
Applications
Hot Board Insertion
Electronic Circuit Breakers
Industrial High-Side Switch/Circuit Breakers
Network Routers and Switches
24V/48V Industrial/Alarm Systems
Features
♦ Pin- and Function-Compatible with the LT1641-2
(MAX5947B)
♦ Provides Safe Hot Swap for +9V to +80V Power-
Supply Range (MAX5947A/B/C)
♦ Safe Board Insertion and Removal from Live
Backplanes
♦ Latched/Autoretry Management
♦ Active-Low or Active-High Power-Good Output
♦ Programmable Foldback Current Limiting
♦ High-Side Drive for an External N-Channel MOSFET
♦ Built-In Thermal Shutdown
♦ Undervoltage Lockout (UVLO)
♦ Overvoltage Protection
♦ User-Programmable Supply Voltage
Power-Up Rate
MAX5933A–MAX5933F/MAX5947A/B/C
Positive High-Voltage, Hot-Swap Controllers
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
19-3263; Rev 1; 7/04
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.
Typical Application Circuit and Pin Configuration appear at
end of data sheet.
PART TEMP RANGE PIN-PACKAGE
MAX5933_ESA* -40°C to +85°C 8 SO
MAX5947_ESA* -40°C to +85°C 8 SO
*Insert the desired suffix from the Selector Guide into the blank
to complete the part number.
PART
LATCHED
FAULT
PROTECTION
AUTORETRY
FAULT
PROTECTION
PWRGD
OUTPUT LOGIC
DUTY CYCLE
(%)
DEFAULT UVLO
(V)
SUPPLY
VOLTAGE
RANGE (V)
MAX5933A Yes — High — 31 33 to 80
MAX5933B — Yes High 3.75 31 33 to 80
MAX5933C Yes — Low — 31 33 to 80
MAX5933D — Yes Low 3.75 31 33 to 80
MAX5933E — Yes High 0.94 31 33 to 80
MAX5933F — Yes Low 0.94 31 33 to 80
MAX5947A Yes — Low — 8.3 9 to 80
MAX5947B — Yes High 3.75 8.3 9 to 80
MAX5947C — Yes Low 3.75 8.3 9 to 80
Selector Guide