Overview
The LM2678SX-ADJ/NOPB is a high-efficiency step-down voltage regulator produced by Texas Instruments. It is part of the SIMPLE SWITCHER® family of power converters, designed to provide all the active functions required for a step-down (buck) switching regulator. This regulator is capable of driving up to 5-A loads with excellent line and load regulation characteristics. The adjustable output version allows for output voltages ranging from 1.21V to 37V, making it versatile for various applications.
Key Specifications
| Parameter | Description |
|---|---|
| Manufacturer | Texas Instruments |
| Part Number | LM2678SX-ADJ/NOPB |
| Package | TO-263-7 |
| Output Voltage | Adjustable: 1.21V to 37V |
| Output Current | Up to 5A |
| Input Voltage Range | 8V to 40V |
| Operating Temperature | -40°C to +125°C (TJ) |
| Oscillator Frequency | 260 kHz |
| Switch ON-Resistance | 120 mΩ (typical) |
| Efficiency | Up to 92% |
| Standby Quiescent Current | 50 μA (typical) |
| Output Voltage Tolerance | ±2% over full line and load conditions |
Key Features
- High efficiency up to 92% due to the use of a low ON-resistance DMOS power switch.
- Simple and easy to design using off-the-shelf external components.
- Adjustable output voltage from 1.21V to 37V.
- Wide input voltage range: 8V to 40V.
- Fixed frequency internal oscillator at 260 kHz.
- Built-in thermal shutdown, current limiting, and ON/OFF control input.
- Low standby quiescent current of 50 μA when switched off.
- ±2% maximum output voltage tolerance over full line and load conditions.
Applications
- Simple-to-design, high-efficiency step-down switching regulators.
- Efficient system pre-regulator for linear voltage regulators.
- Battery chargers.
- General power supply applications requiring high current and efficiency.
Q & A
- What is the LM2678SX-ADJ/NOPB used for?
The LM2678SX-ADJ/NOPB is used as a high-efficiency step-down voltage regulator in various power supply applications.
- What is the output voltage range of the LM2678SX-ADJ/NOPB?
The output voltage is adjustable from 1.21V to 37V.
- What is the maximum output current of the LM2678SX-ADJ/NOPB?
The maximum output current is up to 5A.
- What is the input voltage range for the LM2678SX-ADJ/NOPB?
The input voltage range is from 8V to 40V.
- What is the operating temperature range of the LM2678SX-ADJ/NOPB?
The operating temperature range is from -40°C to +125°C (TJ).
- What is the efficiency of the LM2678SX-ADJ/NOPB?
The efficiency can be up to 92%.
- Does the LM2678SX-ADJ/NOPB have built-in protection features?
Yes, it includes built-in thermal shutdown, current limiting, and an ON/OFF control input.
- What is the standby quiescent current of the LM2678SX-ADJ/NOPB?
The standby quiescent current is typically 50 μA when switched off.
- What is the output voltage tolerance of the LM2678SX-ADJ/NOPB?
The output voltage tolerance is ±2% over full line and load conditions.
- What is the oscillator frequency of the LM2678SX-ADJ/NOPB?
The oscillator frequency is fixed at 260 kHz.
