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Features
- Safe Hot Swap for +1V to +13.2V Power Supplies with VIN1 or VIN2 > 2.7V
- Independent On/Off Control for Each Channel
- Internal Charge Pumps Generate N-Channel MOSFET Gate Drives
- Inrush Current Regulated at Startup
- Circuit Breaker Function
- Adjustable Circuit Breaker/Current-Limit Threshold from 25mV to 100mV
- VariableSpeed/BiLevel Circuit Breaker Response
- Autoretry or Latched Fault Management
- Status Outputs Indicate Fault/Safe Condition
- Output Undervoltage and Overvoltage Monitoring or Protection
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The MAX5918 and MAX5919 are +1V to +13.2V dual hot-swap controllers with independent on/off control for complete protection of dual-supply systems. They allow the safe insertion and removal of circuit cards into live backplanes. The MAX5918 and MAX5919 operate down to 1V provided one of the inputs is above 2.7V.
The discharged filter capacitors of the circuit card provide low impedance to the live backplane. High inrush 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. The MAX5918 and MAX5919 hot-swap controllers prevent such problems by gradually ramping up the output voltage and 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 VariableSpeed/BiLevel™ protection against short-circuit and overcurrent faults, as well as immunity against system noise and load transients. In the event of a fault condition, the load is disconnected. The MAX5918L and MAX5919L must be unlatched after a fault and the MAX5918A and MAX5919A automatically restart after a fault.
The MAX5918 and MAX5919 integrate an on-board charge pump to drive the gates of low-cost, external N-channel MOSFETs. The devices offer integrated features like startup current regulation and current glitch protection to eliminate external timing resistors and capacitors. These devices provide open-drain status outputs, an adjustable startup timer and adjustable current limits. The MAX5918 provides output undervoltage/ overvoltage protection for each channel, while the MAX5919 provides undervoltage/overvoltage monitoring for each channel.
The MAX5918 and MAX5919 are available in a space-saving 16-pin QSOP package and are specified over the extended -40°C to +85°C temperature range.
Applications
- Base-Station Line Cards
- Bays (Docking Stations)
- Hot Plug-In Daughter Cards
- Network Hubs, Switches, Routers
- Portable Computer Device
- Power-Supply Sequencing
- RAID
- Solid-State Circuit Breakers
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MAX5918
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Software & Part Ecosystem
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Low Voltage Hot Swap Controllers6 |
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PRODUCTION |
3V to 12V, Current-Limiting, Hot Swap Controllers with Autoretry, DualSpeed/BiLevel Fault Protection |
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PRODUCTION |
3V to 12V, Current-Limiting, Hot Swap Controllers with Autoretry, DualSpeed/BiLevel Fault Protection |
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PRODUCTION |
3V to 12V, Current-Limiting, Hot Swap Controllers with Autoretry, DualSpeed/BiLevel Fault Protection |
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PRODUCTION |
Low-Voltage, Dual Hot-Swap Controllers/Power Sequencers |
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Low-Voltage, Dual Hot-Swap Controllers/Power Sequencers |
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PRODUCTION |
Low-Voltage, Dual Hot-Swap Controllers/Power Sequencers |
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Low-Voltage, Dual Hot-Swap Controllers/Power Sequencers |
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Low-Voltage, Dual Hot-Swap Controllers/Power Sequencers |
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Low-Voltage, Dual Hot-Swap Controllers/Power Sequencers |
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Evaluation Kits 1
MAX5919AEVKIT
Evaluation Kit for the MAX5918A, MAX5918L, MAX5919A, and MAX5919L
Features and Benefits
- Input Voltage:
- 5V, VIN1 (As Configured)
- 1.8V, VIN2 (As Configured)
- Independent ON/OFF Control
- Outputs Configured for 5V and 1.8V (Configurable from 1.0V to 13.2V)
- Configured to 10A Output Current Capability (Both Outputs)
- 25mV Current Threshold Trip (10A)
- Demonstrates Unique Current Regulation Architecture
- Configurable Startup Timer
- Configurable Current Limits
- Configurable Output Overvoltage and Undervoltage Monitoring (Both Outputs)
- Evaluates MAX5918/MAX5919 with IC Replacement
- Surface-Mount Components
- Fully Assembled and Tested
Product Detail
The MAX5919A evaluation kit (EV kit) is a fully assembled and tested surface-mount dual hot-swap controller circuit board that provides current-limiting and VariableSpeed/BiLevel™ fault protection. The circuit uses a MAX5919A IC in a 16-pin QSOP package and is configurable for a 1.0V to 13.2V input range. The MAX5919A features autoretry and output undervoltage and overvoltage monitoring.
The EV kit is configured for 5V and 1.8V inputs. Both inputs are configured for up to 10A of output current. The MAX5919A controls two N-channel MOSFETs and provides current regulation during startup for both inputs. Several configurations allow the MAX5919A 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 of the MAX5919A.
The EV kit features several configurations for the startup timer setting, current limit, and output voltage monitoring. The EV kit also provides independent turn-on delays for the outputs. The EV kit can also be used to evaluate other versions of the MAX5918 or MAX5919 after replacing the MAX5919A.
Applications
- Base-Station Line Cards
- Hot Plug-In Daughter Cards RAID
- Network Hubs, Switches, Routers
- Portable Computer Device Bays (Docking Stations)
- Power-Supply Sequencing
- Solid-State Circuit Breakers