Features and Benefits
- Provide Safe Hot Swap for +3V to +12V Power Supplies with Few External Components
- Unique Current Regulation Architecture Minimizes n-FET Linear Mode Duration
- Autoretry Feature (MAX4272/MAX4273)
- DualSpeed/BiLevel Current Limit Protects Against Current Glitches and Short Circuits
- Power-On RESET (MAX4273)
- 15V Absolute Maximum Rating Protects Against Inductive Kickbacks During Board Removal
- Internal Charge Pump Generates Gate Drive for External n-MOSFET
- Status Output Pin Indicates Fault/Safe Condition
- Space-Saving 8-Pin SO, 16-Pin QSOP Packages
The MAX4271/MAX4272/MAX4273 comprise a complete family of integrated 3V to 12V hot-swap controllers. They allow the safe insertion and removal of circuit cards into live backplanes.
The discharged filter capacitors of the circuit card provide a low impedance to the live backplane. High in-rush currents from the backplane to the circuit card can burn up connectors and components, or momentarily collapse the backplane power supply leading to a system reset. This family of hot-swap controllers prevents such problems by regulating the current to a preset limit when the board is plugged in, allowing the system to stabilize safely. After the startup cycle is completed, two on-chip comparators provide DualSpeed/BiLevel™ protection against short circuits, load glitches, and overcurrent conditions. In the event of a fault condition, the load is disconnected. Fault recovery is handled by unlatching (MAX4271), autoretry (MAX4272), or programmed (MAX4273) methods.
The MAX4271 family includes many integrated features that reduce component count and design time. An on-board charge pump provides the gate drive for a low-cost, external n-FET. Integrated features like startup current regulation and current glitch protection eliminate external timing resistors and capacitors. Also featured are an open-drain status output to indicate a fault condition, and an adjustable overcurrent response time.
The MAX4271 (latched fault protection) and MAX4272 (autoretry fault protection) come in 8-pin SO packages. The MAX4273 (full function) comes in the space-saving 16-pin QSOP package and 16-pin SO package. All parts are specified across the extended temperature range, and have an absolute maximum rating of 15V to provide extra protection against inductive kickback during board removal.
- Wireless Base Stations
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
The MAX4273 evaluation kit (EV kit) is a fully assembled and tested surface-mount hot-swap controller circuit board that provides current-limiting and DualSpeed/Bi-Level fault protection. The circuit uses a MAX4273 IC in a 16-pin QSOP package and is configured for a +2.7V to +13.2V input voltage range.
The MAX4273 controls the N-channel MOSFET and provides current regulation during startup. Several configurations allow the MAX4273 IC’s unique current regulation architecture to be tailored to the application. The current-limiting and short-circuit protection features are configurable and demonstrate the various features provided by the MAX4273 IC.
The EV kit features a power-on reset (POR) circuit. Several configurations for autoretry, glitch filters, auxiliary VCC power, and gate drive speed are provided. The EV kit can also be reconfigured to emulate the MAX4271 and MAX4272 hot-swap controllers.
Features & Benefits
- +2.7V to +13.2V Input Range
- Output Configured for +5V (Configurable from +2.7V to +13.2V)
- Up to 10A Capability (as Configured)
- Demonstrates Unique Current-Regulation Architecture
- Auxiliary VCC Feature
- Power-On Reset Circuit
- Configurable Autoretry
- Adjustable N-Channel MOSFET Gate Charging Time
- Configurable Glitch Filters
- Also Emulates MAX4271 and MAX4272 Hot-Swap Controllers
- Surface-Mount Components
- Fully Assembled and Tested
Documentation & Resources
Three Approaches to Creating Negative Low-Voltage Hot-Swap Circuits4/29/2009
Minimize Short-Circuit Current Pulse in Hot-Swap Controller9/20/2004
Advantages of IC-Based Hot-Swap Circuit Protection9/22/2003
Minimizing Short-Circuit Current Amplitude and Pulse Width When Hot-Swap Controller Output is Shorted9/11/2003
MAX4272 Companion Parts
Recommended Related Parts
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