Overview
The ADM1275-3ACPZ-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 various features to ensure reliable power management, monitoring, and protection. It includes a 12-bit analog-to-digital converter (ADC) for current and voltage readback, accessible via a PMBus interface. The ADM1275 also features current limiting, voltage monitoring, and protection mechanisms such as foldback and automatic retry or latch-off on current faults, making it a robust solution for power system management.
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 | mV | Resistor-programmable |
| ADC Resolution | - | - | - | Bits | 12-bit ADC for current, VIN/VOUT readback |
| Response Time to Short Circuit | - | - | 370 ns | ns | - |
| Gate Drive Voltage | - | - | - | V | High gate drive voltage to ensure lowest RDSON |
| PMBus Interface | - | - | - | - | PMBus fast mode compliant |
| Package Type | - | - | - | - | 20-lead QSOP and 20-lead LFCSP |
Key Features
- Hot-swap capability allowing safe insertion and removal of circuit boards from a live backplane.
- Resistor-programmable current limit from 5 mV to 25 mV with ±1% accuracy.
- Integrated 12-bit ADC for current and voltage readback, accessible via PMBus interface.
- Charge-pumped gate drive for multiple external N-channel FETs.
- High gate drive voltage to ensure lowest RDSON.
- Foldback for tighter FET SOA protection.
- Automatic retry or latch-off on current fault.
- Programmable current limit timer for SOA protection.
- Programmable, multifunction GPOs (General Purpose Outputs).
- Power-good status output.
- Analog UV (Undervoltage) and OV (Overvoltage) protection.
- ENABLE pin (ADM1275-3 only).
- Peak detect registers for current and voltage.
Applications
- Power monitoring and control/power budgeting.
- Central office equipment.
- Telecommunication and data communication equipment.
- PCs/servers.
Q & A
- What is the primary function of the ADM1275-3ACPZ-R7?
The primary function of the ADM1275-3ACPZ-R7 is to act as a hot-swap controller, allowing safe insertion and removal of circuit boards from a live backplane while managing power and protecting the system.
- What is the range of the current limit for the ADM1275-3ACPZ-R7?
The current limit range is resistor-programmable from 5 mV to 25 mV.
- What type of ADC does the ADM1275-3ACPZ-R7 integrate?
The ADM1275-3ACPZ-R7 integrates a 12-bit analog-to-digital converter (ADC) for current and voltage readback.
- How does the ADM1275-3ACPZ-R7 protect the external FET?
The device protects the external FET by limiting the time the FET remains on while the current is at its maximum value and through foldback for tighter FET SOA protection.
- What interface does the ADM1275-3ACPZ-R7 use for data communication?
The ADM1275-3ACPZ-R7 uses a PMBus interface for data communication.
- What are the available package types for the ADM1275-3ACPZ-R7?
The device is available in 20-lead QSOP and 20-lead LFCSP packages.
- Does the ADM1275-3ACPZ-R7 have programmable GPOs?
Yes, the ADM1275-3ACPZ-R7 has programmable, multifunction GPOs (General Purpose Outputs).
- What kind of protection does the ADM1275-3ACPZ-R7 offer against voltage anomalies?
The device offers analog undervoltage (UV) and overvoltage (OV) protection.
- Can the ADM1275-3ACPZ-R7 be configured for automatic retry or latch-off on current faults?
Yes, the device can be configured for automatic retry or latch-off on current faults.
- What is the response time to short circuit for the ADM1275-3ACPZ-R7?
The response time to short circuit is 370 ns.
