Overview
The ADM1275-3ARQZ-R7, produced by Analog Devices Inc., is a hot-swap controller designed to enable the safe insertion and removal of circuit boards from a live backplane. This device integrates several key functionalities, including current and voltage monitoring, overcurrent protection, and a digital interface for power management. The ADM1275 features a 12-bit analog-to-digital converter (ADC) for precise current and voltage readback, accessible via a PMBus interface. This allows for real-time monitoring and control of power parameters, enhancing the reliability and efficiency of power systems.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Comments |
|---|---|---|---|---|---|
| Nominal Bus Voltage (VDD) | 2.7 | - | 5.5 | V | 3 V to 5 V ± 10% |
| Current Limit Range | 5 mV | - | 25 mV | - | Resistor-programmable |
| ADC Resolution | - | - | - | 12-bit | - |
| Response Time to Short Circuit | - | - | 370 ns | - | - |
| PMBus Interface | - | - | - | - | Fast mode compliant, up to 400 kHz |
| Package Type | - | - | - | - | 20-lead QSOP and 20-lead LFCSP |
Key Features
- Hot-Swap Capability: Allows safe insertion and removal of circuit boards from a live backplane.
- Current and Voltage Monitoring: Integrated 12-bit ADC for precise current and voltage readback via PMBus interface.
- Overcurrent Protection: Resistor-programmable current limit (5 mV to 25 mV) with ±1% accuracy and automatic retry or latch-off on current fault.
- Gate Drive: Charge-pumped gate drive for multiple external N-channel FETs with high gate drive voltage to ensure lowest RDSON.
- FET Protection: Foldback for tighter FET SOA protection and programmable current limit timer for SOA.
- Power-Good Status Output: Indicates the power status of the system.
- Analog UV and OV Protection: Built-in undervoltage and overvoltage protection.
- Programmable GPOs: Multifunction general-purpose outputs (GPOs) for various system control needs.
Applications
- Power Monitoring and Control/Power Budgeting: Ideal for systems requiring precise power monitoring and control.
- Central Office Equipment: Used in telecommunications and data communication equipment.
- Telecommunication and Data Communication Equipment: Suitable for various telecommunication and data communication systems.
- PCs/Servers: Applicable in power management systems for computers and servers.
Q & A
- What is the primary function of the ADM1275-3ARQZ-R7?
The primary function is to act as a hot-swap controller, allowing safe insertion and removal of circuit boards from a live backplane while providing current and voltage monitoring and protection.
- What is the resolution of the ADC in the ADM1275-3ARQZ-R7?
The ADC has a 12-bit resolution.
- How is the current limit set in the ADM1275-3ARQZ-R7?
The current limit is set using a resistor divider network from the internal reference voltage to the ISET pin, allowing for a range of 5 mV to 25 mV.
- What type of interface does the ADM1275-3ARQZ-R7 use for power management?
The device uses a PMBus interface for power management, which is fast mode compliant up to 400 kHz.
- What are the package options for the ADM1275-3ARQZ-R7?
The device is available in 20-lead QSOP and 20-lead LFCSP packages.
- Does the ADM1275-3ARQZ-R7 have built-in protection features?
Yes, it includes overcurrent protection, undervoltage and overvoltage protection, and foldback for tighter FET SOA protection.
- Can the ADM1275-3ARQZ-R7 be configured for automatic retry or latch-off on current fault?
Yes, the device can be configured for either automatic retry or latch-off on current fault.
- What is the response time to short circuit in the ADM1275-3ARQZ-R7?
The response time to short circuit is 370 ns.
- What are some common applications of the ADM1275-3ARQZ-R7?
Common applications include power monitoring and control, central office equipment, telecommunication and data communication equipment, and PCs/servers.
- Does the ADM1275-3ARQZ-R7 support multiple PMBus addresses?
Yes, up to four unique PMBus addresses can be selected based on the configuration of the ADR pin.
