Overview
The LM2674MX-12/NOPB is a high-efficiency step-down (buck) switching regulator produced by Texas Instruments. This device is part of the SIMPLE SWITCHER® family and is designed to provide a simple and efficient solution for power conversion needs. The LM2674 is built using a LMDMOS process and offers excellent line and load regulation, making it suitable for a variety of applications. It can deliver up to 0.5-A DC load current and operates with an input voltage range of 8 V to 40 V. The device is available in fixed output voltages of 3.3 V, 5 V, 12 V, and an adjustable output version, making it versatile for different system requirements.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Voltage Range | 8 | - | 40 | V |
| Output Voltage (Fixed Versions) | 3.3, 5, 12 | - | - | V |
| Output Current | - | - | 500 | mA |
| Switching Frequency | 225 | 260 | 275 | kHz |
| Efficiency | - | - | > 90% | - |
| Quiescent Current | 2.5 | 3.6 | - | mA |
| Standby Quiescent Current | 50 | 100 | 150 | μA |
| Current Limit | 0.62 | 0.8 | 1.2 | A |
| Switch ON-resistance | 0.25 | 0.4 | 0.6 | Ω |
| Maximum Junction Temperature | - | - | 150 | °C |
Key Features
- High-efficiency (> 90%) step-down (buck) switching regulator.
- Wide input voltage range of 8 V to 40 V.
- Fixed output voltages of 3.3 V, 5 V, 12 V, and an adjustable output version.
- Capable of delivering up to 0.5-A DC load current.
- 260-kHz fixed frequency internal oscillator, allowing for smaller filter components.
- TTL shutdown capability and low power standby mode.
- Thermal shutdown and current limit protection.
- Simple design requiring a minimum number of external components.
- Patented internal frequency compensation).
Applications
- Simple high-efficiency step-down (buck) regulators).
- Efficient pre-regulator for linear regulators).
- Positive-to-negative converters).
- General power supply applications requiring high efficiency and reliability).
Q & A
- What is the input voltage range of the LM2674?
The input voltage range of the LM2674 is from 8 V to 40 V).
- What are the available fixed output voltages for the LM2674?
The LM2674 is available in fixed output voltages of 3.3 V, 5 V, and 12 V, as well as an adjustable output version).
- What is the maximum output current of the LM2674?
The LM2674 can deliver up to 0.5-A DC load current).
- What is the switching frequency of the LM2674?
The switching frequency of the LM2674 is 260 kHz).
- Does the LM2674 have thermal protection?
Yes, the LM2674 includes thermal shutdown and current limit protection).
- How efficient is the LM2674?
The LM2674 has an efficiency of greater than 90%).
- What is the purpose of the TTL shutdown capability?
The TTL shutdown capability allows the device to enter a low power standby mode).
- Can the LM2674 be used as a pre-regulator for linear regulators?
Yes, the LM2674 can be used as an efficient pre-regulator for linear regulators).
- What tools can be used to design with the LM2674?
The WEBENCH Power Designer can be used to create custom designs with the LM2674).
- What is the maximum junction temperature for the LM2674?
The maximum junction temperature for the LM2674 is 150°C).
