Overview
The ADM1186-1ARQZ-REEL is an integrated, four-channel voltage monitoring and sequencing device produced by Analog Devices Inc. This component is designed to monitor and control multiple voltage rails, ensuring proper power-up and power-down sequences in various electronic systems. It operates from a 2.7 V to 5.5 V power supply on the VCC pin and features four precision comparators with a worst-case accuracy of 0.8% to monitor four different voltage levels.
Key Specifications
| Parameter | Value |
|---|---|
| Power Supply Voltage (VCC) | 2.7 V to 5.5 V |
| Comparator Accuracy | 0.8% |
| Number of Monitored Voltage Rails | 4 |
| Enable Outputs | Four open-drain enable outputs (OUT1 to OUT4) |
| Power-Good Output | Open-drain power-good output (PWRGD) |
| Sequence Complete Pin | Open-drain sequence complete pin (SEQ_DONE) - ADM1186-1 only |
| Fault Pin | Bidirectional open-drain fault pin - ADM1186-1 only |
| Sequence Time Delays | Capacitor programmable to 5% accuracy at 25°C |
| Package Type | 20-lead QSOP |
Key Features
- Powered from 2.7 V to 5.5 V on the VCC pin
- Monitors four supplies via 0.8% accurate comparators
- Digital core supports up and down supply sequencing
- Multiple devices can be cascaded (ADM1186-1)
- Four inputs can be programmed to monitor different voltage levels with resistor dividers
- Capacitor programmable supply sequence time delays and a timeout delay to 5% accuracy at 25°C
- Four open-drain enable outputs
- Open-drain power-good output
- Open-drain sequence complete pin and bidirectional open-drain fault pin (ADM1186-1 only)
Applications
- Monitor and alarm functions
- Up and down power supply sequencing
- Telecommunication and data communication equipment
- PCs, servers, and notebook PCs
Q & A
- What is the operating voltage range of the ADM1186-1ARQZ-REEL?
The ADM1186-1ARQZ-REEL operates from a 2.7 V to 5.5 V power supply on the VCC pin. - How accurate are the comparators in the ADM1186-1ARQZ-REEL?
The comparators have a worst-case accuracy of 0.8%. - How many voltage rails can the ADM1186-1ARQZ-REEL monitor?
The device can monitor four different voltage rails. - What type of outputs does the ADM1186-1ARQZ-REEL have?
The device has four open-drain enable outputs (OUT1 to OUT4), an open-drain power-good output (PWRGD), and an open-drain sequence complete pin (SEQ_DONE) for the ADM1186-1. - Can multiple ADM1186-1 devices be cascaded?
Yes, multiple ADM1186-1 devices can be cascaded to perform controlled power-up and power-down sequences. - How are the sequence time delays programmed in the ADM1186-1ARQZ-REEL?
The sequence time delays are capacitor programmable to 5% accuracy at 25°C. - What is the purpose of the SEQ_DONE pin in the ADM1186-1?
The SEQ_DONE pin is asserted high to indicate that a power-up sequence is complete and allows multiple cascaded devices to perform controlled power-up and power-down sequences. - What types of applications is the ADM1186-1ARQZ-REEL suited for?
The device is suited for monitor and alarm functions, up and down power supply sequencing, telecommunication and data communication equipment, PCs, servers, and notebook PCs. - How are the undervoltage (UV) trip points set for the monitored supply rails?
The UV trip points are set using external resistor networks connected to the VIN1, VIN2, VIN3, and VIN4 pins. - What happens during a power-down sequence in the ADM1186-1ARQZ-REEL?
During a power-down sequence, the enable outputs turn off in reverse order using the same sequence time delays as during the power-up sequence, and no blanking time is used.
