Datasheet MAX4271, MAX4272, MAX4273 (Maxim)

19-1694; Rev 2; 12/07
EVALUATION KIT AVAILABLE 3V to 12V Current-Limiting Hot-Swap Controllers with Autoretry, DualSpeed/BiLevel Fault Protection MAX4271/MAX4272/MAX4273 General Description Features
The MAX4271/MAX4272/MAX4273 comprise a com- ♦
Provide Safe Hot Swap for +3V to +12V Power
plete family of integrated 3V to 12V hot-swap con-
Supplies with Few External Components
trollers. They allow the safe insertion and removal of circuit cards into live backplanes. ♦
Unique Current Regulation Architecture
The discharged filter capacitors of the circuit card pro-
Minimizes n-FET Linear Mode Duration
vide a low impedance to the live backplane. High in- ♦
Autoretry Feature (MAX4272/MAX4273)
rush currents from the backplane to the circuit card can ♦
DualSpeed/BiLevel Current Limit Protects Against
burn up connectors and components, or momentarily
Current Glitches and Short Circuits
collapse the backplane power supply leading to a sys- tem reset. This family of hot-swap controllers prevents ♦
Power-On RESET (MAX4273)
such problems by regulating the current to a preset ♦
15V Absolute Maximum Rating Protects Against
limit when the board is plugged in, allowing the system
Inductive Kickbacks During Board Removal
to stabilize safely. After the startup cycle is completed, two on-chip comparators provide DualSpeed/BiLevel™ ♦
Internal Charge Pump Generates Gate Drive for
protection against short circuits, load glitches, and
External n-MOSFET
overcurrent conditions. In the event of a fault condition, ♦
Status Output Pin Indicates Fault/Safe Condition
the load is disconnected. Fault recovery is handled by ♦ unlatching (MAX4271), autoretry (MAX4272), or pro-
Space-Saving 8-Pin SO, 16-Pin QSOP Packages
grammed (MAX4273) methods. The MAX4271 family includes many integrated features
________________________Applications
that reduce component count and design time. An on- Base Stations Network Routers and board charge pump provides the gate drive for a low- Switches cost, external n-FET. Integrated features like startup RAID current regulation and current glitch protection eliminate Remote-Access Servers ISDN external timing resistors and capacitors. Also featured are an open-drain status output to indicate a fault condi- tion, and an adjustable overcurrent response time.
Ordering Information
The MAX4271 (latched fault protection) and MAX4272
PIN- PKG
(autoretry fault protection) come in 8-pin SO packages.
PART TEMP RANGE PACKAGE CODE
The MAX4273 (full function) comes in the space-saving 16-pin QSOP package and 16-pin SO package. All
MAX4271
ESA -40°C to +85°C 8 SO S8-1 parts are specified across the extended temperature
MAX4272
ESA -40°C to +85°C 8 SO S8-1 range, and have an absolute maximum rating of 15V to
MAX4273
EEE -40°C to +85°C 16 QSOP E16-1 provide extra protection against inductive kickback dur- ing board removal. MAX4273ESE -40°C to +85°C 16 SO E16-1 DualSpeed/BiLevel is a trademark of Maxim Integrated
Pin Configurations appear at end of data sheet.
Products.
Typical Operating Circuit
BACKPLANE REMOVABLE CARD M1 RSENSE N 2.7V TO 13.2V VCC VOUT CBOARD IN SENSE GATE STAT STAT GND CSPD MAX4271 ON ON MAX4272 CTIM GND CTIM
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