Overview
The LM3880MF-1AB/NOPB is a simple power supply sequencer designed by Texas Instruments. This device is part of the LM3880 series and is specifically tailored for managing the power-up and power-down sequences of multiple independent voltage rails. It is particularly useful in avoiding latch conditions and large in-rush currents that can compromise system reliability. The LM3880MF-1AB/NOPB is available in a compact 6-pin SOT-23 package, making it suitable for a variety of applications where space is limited.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Input Voltage Range (VCC to GND) | 2.7 | 5.5 | V | |
| Operating Temperature Range | -40 | 125 | °C | |
| Quiescent Current (IQ) | 25 | 80 | µA | |
| Output Flag Leakage Current (IFLAG) | 1 | 20 | nA | |
| Output Flag Voltage Low (VOL) | 0.4 | V | ||
| Timer Delay Accuracy (td1, td2) | -15% to 15% | % | ||
| Junction-to-Ambient Thermal Resistance (RθJA) | 187.6 | °C/W |
Key Features
- Simple Power Sequencing: The LM3880MF-1AB/NOPB provides a straightforward solution for sequencing three voltage rails from a single input signal.
- Cascading Capability: Up to three devices can be cascaded to sequence as many as nine voltage rails.
- Adjustable Delays: EPROM capability allows every delay and sequence to be fully adjustable.
- Low Quiescent Current: The device operates with a low quiescent current of 25 µA.
- Compact Package: Available in a 6-pin SOT-23 package with a tiny footprint of 2.9-mm x 1.6-mm.
- Open-Drain Output Flags: The three open-drain output flags can be pulled up to distinct voltage supplies, allowing interface with ICs requiring different enable signals.
- Precision Enable Pin: The enable pin features an internal comparator referenced to a bandgap voltage (1.25 V) for precise timing control.
Applications
- Advanced Driver Assistance Systems (ADAS): Ideal for managing power sequencing in ADAS systems.
- Automotive Camera Modules: Used in automotive camera modules for controlled power-up sequences.
- Security Cameras: Suitable for security cameras requiring reliable power management.
- Servers and Networking Elements: Commonly employed in server systems and networking equipment for efficient power sequencing.
- FPGA Power Supply Sequencing: Used in FPGA power supply sequencing to ensure proper startup and shutdown sequences.
- Microprocessor and Microcontroller Sequencing: Ideal for sequencing power supplies in microprocessor and microcontroller systems.
- Industrial Control Systems: Suitable for industrial control systems requiring precise power management.
Q & A
- What is the primary function of the LM3880MF-1AB/NOPB?
The primary function is to manage the power-up and power-down sequences of multiple independent voltage rails.
- What is the package type and size of the LM3880MF-1AB/NOPB?
The device is available in a 6-pin SOT-23 package with a footprint of 2.9-mm x 1.6-mm.
- What is the input voltage range for the LM3880MF-1AB/NOPB?
The input voltage range is from 2.7 V to 5.5 V.
- How many voltage rails can be sequenced using the LM3880MF-1AB/NOPB?
It can sequence three voltage rails from a single input signal, and up to three devices can be cascaded to sequence as many as nine voltage rails.
- What is the quiescent current of the LM3880MF-1AB/NOPB?
The quiescent current is 25 µA.
- Can the timing delays be adjusted in the LM3880MF-1AB/NOPB?
- What type of output flags does the LM3880MF-1AB/NOPB have?
The device has three open-drain output flags that can be pulled up to distinct voltage supplies.
- How is the enable pin controlled in the LM3880MF-1AB/NOPB?
The enable pin features an internal comparator referenced to a bandgap voltage (1.25 V) for precise timing control.
- What are some common applications of the LM3880MF-1AB/NOPB?
Common applications include ADAS, automotive camera modules, security cameras, servers, networking elements, FPGA power supply sequencing, and industrial control systems.
- How can the power-down sequence be controlled in the LM3880MF-1AB/NOPB?
The power-down sequence follows a reverse sequence of the power-up sequence to avoid latch conditions.
