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

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