Overview
The LM3880MFX-1AD/NOPB, produced by Texas Instruments, is a simple power supply sequencer designed to control the power-up and power-down sequencing of multiple independent voltage rails. This device is particularly useful in systems where controlled startup and shutdown sequences are crucial to avoid latch conditions and large inrush currents. The LM3880 is available in a compact 6-pin SOT-23 package and features a tiny footprint of 2.9-mm x 1.6-mm, making it suitable for a variety of applications where space is limited.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| Input Voltage Range | 2.7 | - | 5.5 | V |
| Quiescent Current (IQ) | 25 | 80 | - | µA |
| Flag Output Voltage Low (VOL) | - | - | 0.4 | V |
| Flag Leakage Current (IFLAG) | - | - | 20 | nA |
| Junction Temperature Range | -40 | - | 125 | °C |
| Timing Delays (td1, td2, td3, etc.) | 16ms to 120ms | - | - | ms |
Key Features
- Simple solution for sequencing three voltage rails from a single input signal.
- Easily cascade up to three devices to sequence as many as nine voltage rails.
- Power-up and power-down control with adjustable timing delays.
- Tiny 2.9-mm x 1.6-mm footprint in a 6-pin SOT-23 package.
- Low quiescent current of 25 µA.
- Open-drain output flags that can be pulled up to distinct voltage supplies.
- EPROM capability for fully adjustable delays and sequences.
- Precision enable pin with internal comparator referenced to a bandgap voltage (1.25 V).
Applications
- Advanced driver assistance systems (ADAS).
- Automotive camera modules.
- Security cameras.
- Servers and networking elements.
- FPGA power supply sequencing.
- Microprocessor and microcontroller sequencing.
- Multiple supply sequencing in various electronic systems.
Q & A
- What is the primary function of the LM3880MFX-1AD/NOPB?
The primary function is to control the power-up and power-down sequencing of multiple independent voltage rails.
- What is the package type and size of the LM3880MFX-1AD/NOPB?
The device is packaged 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 LM3880MFX-1AD/NOPB?
The input voltage range is from 2.7 V to 5.5 V.
- How can the timing delays be adjusted in the LM3880MFX-1AD/NOPB?
The timing delays can be adjusted using an external capacitor connected to the enable pin or through EPROM programming for non-standard configurations.
- What are the typical applications of the LM3880MFX-1AD/NOPB?
Typical applications include ADAS, automotive camera modules, security cameras, servers, networking elements, FPGA power supply sequencing, and microprocessor/microcontroller sequencing.
- Can the LM3880MFX-1AD/NOPB be cascaded to sequence more voltage rails?
- What is the quiescent current of the LM3880MFX-1AD/NOPB?
The quiescent current is 25 µA.
- How do the open-drain output flags operate in the LM3880MFX-1AD/NOPB?
The open-drain output flags can be pulled up to distinct voltage supplies separate from the sequencer VDD, allowing interface with ICs requiring different enable signals.
- What is the junction temperature range for the LM3880MFX-1AD/NOPB?
The junction temperature range is from -40°C to +125°C.
- How is the enable pin of the LM3880MFX-1AD/NOPB designed?
The enable pin is designed with an internal comparator referenced to a bandgap voltage (1.25 V) to provide a precision threshold.
