Overview
The LM2677SX-ADJ/NOPB is a high-efficiency 5A step-down voltage regulator produced by Texas Instruments. It is part of the SIMPLE SWITCHER® series, designed to provide all the active functions for a buck switching regulator. This regulator is capable of driving up to 5A loads with excellent line and load regulation characteristics. It features a low on-resistance DMOS power switch, which ensures high efficiency greater than 90%.
Key Specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Part Number | LM2677SX-ADJ/NOPB |
| Package Type | TO-263 (KTW) |
| Pins | 7 |
| Operating Temperature Range | -40°C to 125°C |
| Input Voltage Range | 8 V to 40 V |
| Output Voltage Range | 1.2 V to 37 V (Adjustable) |
| Maximum Output Current | 5 A |
| Switching Frequency | 260 kHz (Fixed), 280 kHz to 400 kHz (External Sync) |
| Efficiency | Up to 92% |
| Quiescent Current (Typical) | 4.2 mA |
| Quiescent Current (Standby) | 50 µA |
| Output Tolerance | ±2% Over Full Line and Load Conditions |
| RoHS Compliance | Yes |
Key Features
- High efficiency up to 92% due to low on-resistance DMOS power switch.
- Simple and easy design using off-the-shelf external components.
- Fixed output voltages of 3.3 V, 5 V, and 12 V, and an adjustable output version.
- 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 50 µA quiescent current in standby mode.
Applications
The LM2677SX-ADJ/NOPB is suitable for a wide range of applications requiring high-efficiency step-down voltage regulation. These include:
- Power supplies for industrial and consumer electronics.
- DC-DC converters in automotive systems.
- Telecommunication equipment.
- Medical devices requiring stable and efficient power supply.
- Embedded systems and IoT devices.
Q & A
- What is the maximum output current of the LM2677SX-ADJ/NOPB? The maximum output current is 5 A.
- What is the input voltage range for this regulator? The input voltage range is from 8 V to 40 V.
- Can the switching frequency be adjusted? Yes, the switching frequency can be set by an internal fixed frequency oscillator (260 kHz) or by an external sync clock (280 kHz to 400 kHz).
- What is the quiescent current in standby mode? The quiescent current in standby mode is 50 µA.
- Is the LM2677SX-ADJ/NOPB RoHS compliant? Yes, it is RoHS compliant.
- What are the operating temperature ranges for this regulator? The operating temperature range is from -40°C to 125°C.
- How accurate is the output voltage tolerance? The output voltage tolerance is ±2% over full line and load conditions.
- Does the regulator have built-in protection features? Yes, it includes built-in thermal shutdown and current-limiting features.
- Can the output voltage be adjusted? Yes, the output voltage is adjustable from 1.2 V to 37 V.
- What is the typical quiescent current during normal operation? The typical quiescent current is 4.2 mA).
