Overview
The LM2678T-ADJ/NOPB is a high-efficiency, 5-A step-down voltage regulator produced by Texas Instruments. It is part of the SIMPLE SWITCHER® family of power converters, designed to provide efficient power conversion in various electronic devices. This regulator is capable of driving up to 5-A loads with excellent line and load regulation characteristics. The LM2678T-ADJ/NOPB offers adjustable output voltage settings, making it versatile for a wide range of applications.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| VIN (Input Voltage) | 8 | 40 | V | |
| VOUT (Output Voltage) | 1.23 | 37 | V | |
| IOUT (Maximum Output Current) | 5 | A | ||
| IQ (Typical Quiescent Current) | 4.2 | mA | ||
| Switching Frequency | 260 | 260 | kHz | |
| Operating Temperature Range | -40 | 125 | °C | |
| RDS(ON) (Switch ON-Resistance) | 0.12 | 0.14 | 0.225 | Ω |
| Duty Cycle (Maximum) | 91% | % |
Key Features
- Adjustable Output Voltage: Allows for customizable output voltage settings from 1.2 V to 37 V.
- High Current Capability: Capable of delivering up to 5 A of output current.
- Efficient Power Conversion: Achieves efficiency up to 92% due to the use of a low ON-resistance DMOS power switch.
- Thermal Shutdown Protection: Features thermal shutdown to prevent overheating.
- Fixed Frequency Oscillator: Operates at a fixed frequency of 260 kHz, allowing the use of smaller components.
- Low Quiescent Current in Standby: Consumes only 50 μA in standby mode when switched off.
- High Accuracy Output Voltage: Ensures ±2% maximum output tolerance over full line and load conditions.
Applications
- Power Supplies: Ideal for power supply applications requiring adjustable voltage regulation.
- Embedded Systems: Used in embedded systems for stable and efficient power management.
- Consumer Electronics: Suitable for consumer electronic devices where regulated power supply is essential.
- Battery Chargers: Can be used as an efficient system pre-regulator for linear voltage regulators and battery chargers.
Q & A
- Q: What is the LM2678T-ADJ/NOPB?
A: The LM2678T-ADJ/NOPB is a high-efficiency, 5-A step-down voltage regulator designed by Texas Instruments.
- Q: How does the LM2678T-ADJ/NOPB work?
A: It operates by utilizing a step-down switching regulator topology to efficiently convert higher input voltages to lower output voltages.
- Q: What are the key features of the LM2678T-ADJ/NOPB?
A: Key features include adjustable output voltage, high current capability, efficient power conversion, thermal shutdown protection, and a fixed frequency oscillator.
- Q: What is the maximum output current supported by the LM2678T-ADJ/NOPB?
A: The LM2678T-ADJ/NOPB can support output currents up to 5 A.
- Q: What is the operating temperature range of the LM2678T-ADJ/NOPB?
A: The operating temperature range is from -40°C to 125°C.
- Q: Can the LM2678T-ADJ/NOPB be used for automotive applications?
A: Yes, it can be used in automotive applications where adjustable voltage regulation is required, provided the operating conditions meet the specified automotive standards.
- Q: How do I adjust the output voltage of the LM2678T-ADJ/NOPB?
A: The output voltage can be adjusted using the ADJ pin. Refer to the datasheet for detailed instructions.
- Q: What is the typical quiescent current of the LM2678T-ADJ/NOPB in standby mode?
A: The typical quiescent current in standby mode is 50 μA.
- Q: Does the LM2678T-ADJ/NOPB have thermal shutdown protection?
A: Yes, it features thermal shutdown protection to prevent overheating.
- Q: What is the switching frequency of the LM2678T-ADJ/NOPB?
A: The switching frequency is fixed at 260 kHz.
