Overview
The LM2677S-12/NOPB is a high-efficiency step-down switching regulator from Texas Instruments, part of the SIMPLE SWITCHER® series. This monolithic integrated circuit is designed to provide all the active functions necessary for a buck switching regulator, capable of driving loads up to 5 A with excellent line and load regulation characteristics. The regulator features a low on-resistance DMOS power switch, achieving high efficiency of over 90%. It is available in fixed output voltages of 3.3 V, 5 V, and 12 V, as well as an adjustable output version ranging from 1.2 V to 37 V.
Key Specifications
| Parameter | Description | Value | Unit |
|---|---|---|---|
| Input Voltage Range | Operating input voltage range | 8 V to 40 V | V |
| Output Voltage | Fixed output voltage for LM2677S-12/NOPB | 12 V | V |
| Output Current | Maximum continuous output current | 5 A | A |
| Switching Frequency | Internal oscillator frequency | 260 kHz | kHz |
| Output Tolerance | Maximum output voltage tolerance over full line and load conditions | ±2% | % |
| Operating Junction Temperature Range | Operating temperature range | −40°C to 125°C | °C |
| Quiescent Current | Standby current when switched off | 50 μA | μA |
| Package Type | Package and mounting type | TO-263 (KTW), Surface Mount | |
| Number of Pins | Number of pins in the package | 7 |
Key Features
- High efficiency (>90%) due to a low on-resistance DMOS power switch
- Simple and easy to design using off-the-shelf external components
- Fixed output voltages of 3.3 V, 5 V, and 12 V, and an adjustable output version (1.2 V to 37 V)
- Wide input voltage range: 8 V to 40 V
- External sync clock capability (280 kHz to 400 kHz)
- 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
Applications
- Simple to design, high-efficiency step-down switching regulators
- Efficient system preregulator for linear voltage regulators
- Battery chargers
- Communications and radio equipment regulators with synchronized clock frequency
Q & A
- What is the maximum output current of the LM2677S-12/NOPB?
The maximum continuous output current is 5 A.
- What are the fixed output voltage options available for the LM2677 series?
The fixed output voltage options are 3.3 V, 5 V, and 12 V, along with an adjustable output version.
- What is the operating junction temperature range of the LM2677S-12/NOPB?
The operating junction temperature range is −40°C to 125°C.
- Can the LM2677S-12/NOPB be synchronized with an external clock?
- What is the typical efficiency of the LM2677S-12/NOPB?
The typical efficiency is over 90%.
- What is the quiescent current when the regulator is switched off?
The quiescent current is 50 μA when switched off.
- What type of package does the LM2677S-12/NOPB come in?
The package type is TO-263 (KTW), which is a surface mount package.
- How many pins does the LM2677S-12/NOPB have?
The LM2677S-12/NOPB has 7 pins.
- What are some common applications of the LM2677S-12/NOPB?
Common applications include simple to design high-efficiency step-down switching regulators, efficient system preregulators for linear voltage regulators, battery chargers, and communications and radio equipment regulators.
- Does the LM2677S-12/NOPB have built-in protection features?
