Overview
The ADM1278-2ACPZ-RL, produced by Analog Devices Inc., is a hot swap controller designed to facilitate the safe insertion and removal of circuit boards from a live backplane. This device integrates multiple functionalities, including current, voltage, power, and temperature monitoring through a 12-bit analog-to-digital converter (ADC). The ADC can be accessed using a PMBus™ interface, enabling comprehensive digital power system management. The ADM1278 also features overvoltage (OV) and undervoltage (UV) protection, along with a fast internal overcurrent detector to ensure robust protection and reliability in power systems.
Key Specifications
| Parameter | Symbol | Min | Typ | Max | Unit | Test Conditions/Comments |
|---|---|---|---|---|---|---|
| Operating Voltage Range | VCC | 4.5 | 20 | V | VCC ≥ VHS+, VHS+ = 2 V to 20 V | |
| Undervoltage Lockout | UVLO | 2.4 | 2.7 | V | VCC rising | |
| Undervoltage Hysteresis | 90 | 120 | mV | |||
| Quiescent Current | ICC | 5.5 | mA | GATE on and power monitor running | ||
| UV PIN Input Current | IUV | 50 | nA | UV ≤ 3.6 V | ||
| Input High Voltage | VIH | 2.0 | V | |||
| Input Low Voltage | VIL | 0.8 | V | |||
| Output Low Voltage | VOL | 0.4 | V | IOL = 4 mA | ||
| Leakage Current | 1 | μA | ||||
| Data Rate | 1 | MHz | ||||
| Nominal Bus Voltage | VDD | 2.7 | 5.5 | V | 3 V to 5 V ± 10% |
Key Features
- Hot swap capability allowing safe insertion and removal of circuit boards from a live backplane.
- Integrated 12-bit analog-to-digital converter (ADC) for current, voltage, power, and temperature monitoring.
- PMBus™ interface for digital power system management.
- Current limiting and foldback to control power dissipation in the MOSFET during power-up and fault conditions.
- Fast internal overcurrent detector responding within 320 ns and 1500 mA pull-down device for fast FET response.
- Overvoltage (OV) and undervoltage (UV) protection programmed using external resistor dividers.
- PWRGD signal for detecting valid output supply.
- RETRY pin configurable for automatic retry or latch-off in case of overcurrent faults.
Applications
- Data centers and cloud computing infrastructure requiring hot swap capabilities.
- Telecommunication systems needing robust power management and protection.
- Industrial control systems that require reliable and safe power insertion and removal.
- Server and storage systems where power monitoring and control are critical.
Q & A
- What is the primary function of the ADM1278-2ACPZ-RL? The primary function is to act as a hot swap controller, allowing safe insertion and removal of circuit boards from a live backplane while monitoring current, voltage, power, and temperature.
- What interface does the ADM1278 use for digital power management? The ADM1278 uses a PMBus™ interface for digital power system management.
- How does the ADM1278 protect against overcurrent conditions? The ADM1278 features a fast internal overcurrent detector that responds within 320 ns and a 1500 mA pull-down device to quickly shut down the FET in case of an overcurrent event.
- What types of voltage protection does the ADM1278 offer? The ADM1278 offers overvoltage (OV) and undervoltage (UV) protection, which can be programmed using external resistor dividers.
- What is the purpose of the RETRY pin on the ADM1278? The RETRY pin can be configured for automatic retry or latch-off in case of overcurrent faults.
- What is the operating voltage range of the ADM1278? The operating voltage range of the ADM1278 is from 4.5 V to 20 V.
- How does the ADM1278 manage power dissipation in the MOSFET? The ADM1278 uses a constant power foldback scheme to control power dissipation in the MOSFET during power-up and fault conditions.
- What is the resolution of the ADC in the ADM1278? The ADC in the ADM1278 has a resolution of 12 bits.
- What is the typical quiescent current of the ADM1278? The typical quiescent current of the ADM1278 is 5.5 mA when the GATE is on and the power monitor is running.
- In what package is the ADM1278 available? The ADM1278 is available in a 32-lead LFCSP package.
