Overview
The ADM1073ARUZ, produced by Analog Devices Inc., is a full-feature, negative voltage hot swap controller designed to enable safe insertion and removal of boards from a live -48 V backplane. This controller provides precise and robust current limiting and protection against both transient and nontransient short circuits in overvoltage and undervoltage conditions. It operates from a negative voltage range of -18 V to -80 V and can tolerate transient voltages up to -200 V.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Test Conditions |
|---|---|---|---|---|---|
| Maximum Voltage Range | -200 | -48 | -18 | V | VDD = 0 V, VEE = -48 V; TA = -40°C to +85°C |
| Typical Operating Voltage Range | -80 | -48 | -35 | V | VDD = 0 V, VEE = -48 V; TA = -40°C to +85°C |
| Operating Supply Voltage Range (VIN PIN) | 11.7 | 12.3 | 12.9 | V | IIN = 0.6 mA to 2 mA |
| Quiescent Supply Current | 300 | 500 | μA | VDD = 0 V, VEE = -48 V; TA = -40°C to +85°C |
Key Features
- Precision inrush linear current limit and soft start inrush current limit profiling.
- Precision maximum on-time in current limit and autorestart with virtual card reseat function.
- Programmable inrush current limit by controlling the gate drive of an external N-channel FET.
- Built-in soft start function controlled by an external capacitor on the soft start (SS) pin.
- External capacitor on the TIMER pin determines the maximum allowable time in current limit and PWM duty cycle.
- Separate UV and OV pins for undervoltage and overvoltage detection.
- SHDN input for manual shutdown and RESTART input for remote initiation of a 5-second shutdown.
- Fabricated using BiCMOS technology for minimal power consumption.
- Available in a 14-lead TSSOP package.
Applications
- Central office switching.
- Telecommunication and data communication equipment.
- -48 V distributed power systems.
- Negative power supply control.
- High availability servers.
- -48 V power supply modules.
- Disk arrays.
Q & A
- What is the primary function of the ADM1073ARUZ?
The primary function of the ADM1073ARUZ is to enable safe insertion and removal of boards from a live -48 V backplane while providing precise and robust current limiting and protection against short circuits.
- What is the operating voltage range of the ADM1073ARUZ?
The ADM1073ARUZ operates from a negative voltage range of -18 V to -80 V and can tolerate transient voltages up to -200 V.
- How is the inrush current limit controlled in the ADM1073ARUZ?
The inrush current limit is controlled by the gate drive of an external N-channel FET, which is programmable using an external sense resistor (RSENSE).
- What is the purpose of the soft start function in the ADM1073ARUZ?
The soft start function allows control of the inrush current profile using an external capacitor on the soft start (SS) pin.
- How does the ADM1073ARUZ handle fault conditions?
The ADM1073ARUZ employs a limited consecutive autorestart mechanism. After seven successive autorestarts, the fault is latched, and the part goes into shutdown, disabling the external FET until power is reset.
- What package type is the ADM1073ARUZ available in?
The ADM1073ARUZ is available in a 14-lead TSSOP package.
- What technology is used in the fabrication of the ADM1073ARUZ?
The ADM1073ARUZ is fabricated using BiCMOS technology for minimal power consumption.
- What are the key applications of the ADM1073ARUZ?
The key applications include central office switching, telecommunication and data communication equipment, -48 V distributed power systems, negative power supply control, high availability servers, -48 V power supply modules, and disk arrays.
- How can the PWM duty cycle be adjusted in the ADM1073ARUZ?
The PWM duty cycle can be adjusted by adding resistors between the TIMER pin and VEE or VIN, allowing the ratio of on-time to off-time to be decreased or increased respectively.
- What are the undervoltage and overvoltage detection mechanisms in the ADM1073ARUZ?
The ADM1073ARUZ has separate UV and OV pins for undervoltage and overvoltage detection.
