Overview
The LM2676S-ADJ/NOPB is a high-efficiency step-down (buck) switching regulator produced by Texas Instruments. This monolithic integrated circuit provides all the active functions necessary for a buck switching regulator, making it a versatile and efficient power management solution. The LM2676 series is designed to drive up to 3-A loads with excellent line and load regulation characteristics. It features a low ON-resistance DMOS power switch, which contributes to its high efficiency of over 90%.
The regulator is available in fixed output voltages of 3.3 V, 5 V, and 12 V, as well as an adjustable output version that can be set between 1.2 V and 37 V. The SIMPLE SWITCHER® concept allows for a complete design using a minimum number of external components, simplifying the design process.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Supply Voltage | - | - | 45 | V |
| Output Voltage (Fixed Versions) | 3.234 (3.3V), 4.9 (5V), 11.76 (12V) | 3.3, 5, 12 | 3.366 (3.3V), 5.1 (5V), 12.24 (12V) | V |
| Output Voltage (Adjustable Version) | 1.2 | - | 37 | V |
| Output Current | - | - | 3 | A |
| Efficiency | 86% (3.3V), 88% (5V), 94% (12V) | - | - | % |
| Oscillator Frequency | 225 | 260 | 280 | kHz |
| Switch ON-Resistance | 0.15 | 0.17 | 0.29 | Ω |
| Operating Junction Temperature | -40 | - | 125 | °C |
| Standby Quiescent Current | 50 | - | 100 | µA |
Key Features
- High efficiency up to 94% due to the use of a low ON-resistance DMOS power switch.
- Simple and easy to design with, using off-the-shelf external components.
- Fixed output voltages of 3.3 V, 5 V, and 12 V, and an adjustable output version from 1.2 V to 37 V.
- Wide input voltage range: 8 V to 40 V.
- 260 kHz fixed frequency internal oscillator.
- Built-in thermal shutdown, current limiting, and ON/OFF control input.
- Low standby current of 50 µA when switched OFF.
- ±2% maximum output voltage tolerance over full line and load conditions.
Applications
- Communication modules
- Electricity meters
- Calling button operating panels
- Motor drives
Q & A
- What is the input voltage range of the LM2676S-ADJ/NOPB?
The input voltage range is from 8 V to 40 V.
- What are the fixed output voltages available for the LM2676S-ADJ/NOPB?
The fixed output voltages are 3.3 V, 5 V, and 12 V.
- What is the adjustable output voltage range for the LM2676S-ADJ/NOPB?
The adjustable output voltage range is from 1.2 V to 37 V.
- What is the maximum output current of the LM2676S-ADJ/NOPB?
The maximum output current is 3 A.
- What is the efficiency of the LM2676S-ADJ/NOPB?
The efficiency can be up to 94% depending on the output voltage and load conditions.
- What is the oscillator frequency of the LM2676S-ADJ/NOPB?
The oscillator frequency is fixed at 260 kHz.
- Does the LM2676S-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 when the regulator is switched OFF?
The standby quiescent current is 50 µA.
- What is the output voltage tolerance of the LM2676S-ADJ/NOPB?
The output voltage tolerance is ±2% over full line and load conditions.
- What are some typical applications of the LM2676S-ADJ/NOPB?
Typical applications include communication modules, electricity meters, calling button operating panels, and motor drives.
