Overview
The ADM1172-1AUJZ-RL7, produced by Analog Devices Inc., is a hot swap controller designed to manage the insertion and removal of circuit boards from a live backplane. This device operates over a wide supply voltage range of 2.7 V to 16.5 V, ensuring compatibility with various system configurations. It features an undervoltage lockout (UVLO) circuit that ensures the device only operates when the supply voltage is sufficient, preventing premature activation. The ADM1172-1AUJZ-RL7 also includes a power-fail comparator and supports automatic retry for overcurrent faults, making it robust and reliable in high-current applications.
Key Specifications
| Parameter | Value | Description |
|---|---|---|
| Supply Voltage Range | 2.7 V to 16.5 V | Operating voltage range of the device |
| Package Type | TSOT-23-8 | Thin Small Outline Transistor package with 8 leads |
| UVLO Threshold | Internal threshold | Ensures the device only operates when the supply voltage is sufficient |
| Overcurrent Limit | 50 mV/RSENSE | Active current limiting through an external sense resistor |
| ON (ON-CLR) Pin Threshold | 1.3 V with 50 mV hysteresis | Enable pin with glitch filter and hysteresis |
| Temperature Range | -40°C to 85°C | Operating temperature range of the device |
Key Features
- Hot Swap Capability: Allows the insertion and removal of circuit boards from a live backplane without causing damage or disrupting the system.
- Undervoltage Lockout (UVLO): Ensures the device only operates when the supply voltage is sufficient, preventing premature activation.
- Power-Fail Comparator: Compares the voltage on the PFI pin with an internal 0.6 V reference and outputs the result on the PFO pin.
- Automatic Retry for Overcurrent Faults: The ADM1172-1 model automatically retries after an overcurrent fault, while the ADM1172-2 model latches off.
- External Sense Resistor for Current Limiting: Monitors and limits inrush current through an external sense resistor.
- Timer Function: The TIMER pin capacitor sets the periods for all timer functions, including the initial timing cycle and retry cycles.
Applications
- Server and Data Center Systems: Ideal for managing the insertion and removal of boards in live backplanes, ensuring system reliability and uptime.
- Telecommunication Equipment: Used in telecom systems where hot swapping of boards is necessary without disrupting the system.
- Industrial Control Systems: Suitable for industrial environments where robust and reliable hot swap capabilities are required.
Q & A
- What is the supply voltage range of the ADM1172-1AUJZ-RL7?
The supply voltage range is from 2.7 V to 16.5 V.
- What type of package does the ADM1172-1AUJZ-RL7 come in?
The device is packaged in an 8-lead TSOT-23-8 package.
- How does the undervoltage lockout (UVLO) function work?
The UVLO circuit ensures the device only operates when the supply voltage is sufficient, holding the GATE pin to GND until the UVLO threshold is met.
- What is the purpose of the power-fail comparator?
The power-fail comparator compares the voltage on the PFI pin with an internal 0.6 V reference and outputs the result on the PFO pin.
- How does the ADM1172-1 model handle overcurrent faults?
The ADM1172-1 model automatically retries after an overcurrent fault, while the ADM1172-2 model latches off).
- What is the role of the external sense resistor in the ADM1172-1AUJZ-RL7?
The external sense resistor is used to monitor and limit inrush current).
- How is the timer function controlled in the ADM1172-1AUJZ-RL7?
The TIMER pin capacitor sets the periods for all timer functions, including the initial timing cycle and retry cycles).
- What is the operating temperature range of the ADM1172-1AUJZ-RL7?
The operating temperature range is from -40°C to 85°C).
- How can a latched fault be reset in the ADM1172-2 model?
A latched fault can be reset by toggling the ON-CLR pin or by manually pulling the TIMER pin low).
- What are some typical applications of the ADM1172-1AUJZ-RL7?
Typical applications include server and data center systems, telecommunication equipment, and industrial control systems).
