Overview
The ADM1270ACPZ-R7, produced by Analog Devices Inc., is a current-limiting controller designed to provide inrush current limiting and overcurrent protection for modular or battery-powered systems. This device is particularly useful in applications where hot swap operations are necessary, ensuring the safe insertion and removal of power modules without causing damage to the system. The ADM1270 controls the gate voltage of an external P-channel FET in the power path, thereby regulating the load current and protecting the FET from overcurrent conditions.
Key Specifications
| Parameter | Value |
|---|---|
| Supply Voltage Range | 4 V to 60 V |
| Current Sense Amplifier Gain | 40 |
| Default Current Limit | 50 mV (adjustable) |
| Package Type | 16-lead, 3 mm × 3 mm LFCSP |
| UVLO Threshold | 1 V |
| OVLO Threshold | Set by external resistor network |
| Timer Capacitors | CTIMER and CTIMER_OFF (e.g., 100 nF) |
| Fast Response Time to Overcurrent | Approximately 2 µs |
Key Features
- Controls supply voltages from 4 V to 60 V
- Gate drive for low voltage drop reverse supply protection and P-channel FETs
- Inrush current limiting and adjustable current limit
- Foldback current limiting for additional FET protection
- Programmable current-limit timer for safe operating area (SOA)
- Automatic retry or latch-off on current fault
- Power-good and fault outputs
- Analog undervoltage (UV) and overvoltage (OV) protection
Applications
The ADM1270ACPZ-R7 is suitable for various applications requiring hot swap capabilities and overcurrent protection, such as:
- Modular power systems
- Battery-powered systems
- Data centers and server systems
- Telecommunication equipment
- Industrial power supplies
Q & A
- What is the primary function of the ADM1270ACPZ-R7?
The primary function is to provide inrush current limiting and overcurrent protection for modular or battery-powered systems. - What is the supply voltage range for the ADM1270ACPZ-R7?
The supply voltage range is from 4 V to 60 V. - How is the current limit set on the ADM1270ACPZ-R7?
The current limit is set using a sense resistor and can be adjusted via a resistor divider network from the VCAP pin to the ISET pin. - What is the purpose of the TIMER and TIMER_OFF pins?
These pins are used to set the current-limit timer and the initial timing cycle delay, respectively. - Does the ADM1270ACPZ-R7 have built-in UV and OV protection?
Yes, it includes analog undervoltage (UV) and overvoltage (OV) protection. - What is the response time to severe overcurrent conditions?
The response time is approximately 2 µs. - Can the ADM1270ACPZ-R7 be used in hot swap applications?
Yes, it is designed for hot swap operations. - What type of package does the ADM1270ACPZ-R7 come in?
The package type is a 16-lead, 3 mm × 3 mm LFCSP. - Does the ADM1270ACPZ-R7 support automatic retry on current fault?
Yes, it supports automatic retry or latch-off on current fault. - What are some common applications for the ADM1270ACPZ-R7?
Common applications include modular power systems, battery-powered systems, data centers, and telecommunication equipment.
