Overview
The ADM1177-1ARMZ-R7 is an integrated hot swap controller produced by Analog Devices Inc. This device is designed to manage the insertion and removal of circuit boards from a live backplane, ensuring safe and controlled power-up and power-down sequences. The ADM1177-1ARMZ-R7 features digital current and voltage monitoring through an on-chip 12-bit analog-to-digital converter (ADC), making it a robust solution for protecting circuit components from inrush current and overcurrent faults.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage Range | 3.15 to 16.5 | V |
| Undervoltage Lockout (UVLO) Threshold | 2.8 V (with 80 mV hysteresis) | V |
| ON Pin Threshold | 1.3 V (with 50 mV hysteresis) | V |
| Current Limit Setting | 100 mV/RSENSE | mV/Ω |
| Operating Temperature Range | -40 to 85 | °C |
| Package Type | MSOP | - |
Key Features
- Digital current and voltage monitoring via a 12-bit ADC.
- Hot swap functionality to control inrush current and protect circuit components.
- Undervoltage lockout (UVLO) circuit to ensure adequate input supply voltage.
- Initial timing cycle to delay power-up until the board is fully seated.
- Overcurrent fault detection and retry mechanism.
- External N-channel FET control for load management.
- TIMER pin for handling various timing functions with an external capacitor.
Applications
The ADM1177-1ARMZ-R7 is suitable for various applications requiring hot swap capabilities, such as:
- Telecommunication systems.
- Data centers and server systems.
- Industrial control systems.
- Medical devices requiring safe power insertion and removal.
- Any system where live backplane insertion and removal are necessary.
Q & A
- What is the primary function of the ADM1177-1ARMZ-R7?
The primary function is to control the insertion and removal of circuit boards from a live backplane, managing inrush current and protecting components from overcurrent faults.
- What is the supply voltage range for the ADM1177-1ARMZ-R7?
The supply voltage range is from 3.15 V to 16.5 V.
- How does the undervoltage lockout (UVLO) work?
The UVLO circuit resets the device if the voltage on the VCC pin is below 2.8 V, with 80 mV hysteresis.
- What is the role of the ON pin?
The ON pin is used to start the hot swap operation when asserted high, with a threshold of 1.3 V and 50 mV hysteresis.
- How does the device handle overcurrent faults?
The device detects overcurrent faults and can either latch off (ADM1177-2) or retry the hot swap operation indefinitely (ADM1177-1) with a cooldown period.
- What is the purpose of the TIMER pin?
The TIMER pin handles various timing functions, including the initial timing cycle and the retry duty cycle, using an external capacitor.
- What type of package does the ADM1177-1ARMZ-R7 come in?
The device comes in an MSOP package.
- What is the operating temperature range for the ADM1177-1ARMZ-R7?
The operating temperature range is from -40°C to 85°C.
- How does the device protect the external FET?
The device protects the external FET by controlling the gate voltage to limit inrush current and prevent overcurrent faults.
- Can the ADM1177-1ARMZ-R7 be used in medical devices?
Yes, it can be used in medical devices that require safe power insertion and removal.
