Overview
The LM2574N-ADJ is a monolithic integrated circuit designed by National Semiconductor, now part of Texas Instruments, as a step-down switching regulator (buck converter). This device is part of the LM2574 series, which is ideal for easy and convenient design of power supply systems. The LM2574N-ADJ is an adjustable output version, allowing for a wide range of output voltages from 1.23 V to 37 V with a guaranteed ±4% tolerance over line and load conditions.
This regulator is known for its high efficiency, especially when compared to traditional three-terminal linear regulators, and it requires only a few external components to operate. The LM2574N-ADJ features a fixed frequency internal oscillator at 52 kHz, TTL shutdown capability, and low power standby mode, making it versatile for various applications.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Output Voltage Range | 1.23 | Adjustable | 37 | V |
| Output Current | 0.5 | A | ||
| Input Voltage Range | 4.75 | 40 | V | |
| Oscillator Frequency | 42 | 52 | 63 | kHz |
| Efficiency (Typical) | 77 | % | ||
| Operating Junction Temperature Range | -40 | 125 | °C | |
| Maximum Supply Voltage | 45 | V | ||
| Thermal Shutdown | Yes | |||
| Current Limit Protection | Yes |
Key Features
- Adjustable output voltage range from 1.23 V to 37 V with ±4% tolerance over line and load conditions.
- Guaranteed 0.5 A output current.
- Wide input voltage range: 4.75 V to 40 V.
- Requires only 4 external components for operation.
- 52 kHz fixed frequency internal oscillator.
- TTL shutdown capability and low power standby mode.
- High efficiency, especially compared to linear regulators.
- Uses readily available standard inductors.
- Thermal shutdown and cycle-by-cycle current limiting for protection.
Applications
The LM2574N-ADJ is suitable for a variety of applications where a high-efficiency step-down voltage regulator is required. These include:
- Power supplies for electronic devices requiring adjustable output voltages.
- Industrial control systems.
- Telecommunication equipment.
- Automotive systems.
- Consumer electronics.
Q & A
- What is the output voltage range of the LM2574N-ADJ?
The output voltage range is adjustable from 1.23 V to 37 V.
- What is the maximum output current of the LM2574N-ADJ?
The maximum output current is 0.5 A.
- What is the input voltage range for the LM2574N-ADJ?
The input voltage range is from 4.75 V to 40 V.
- How many external components are required for the LM2574N-ADJ to operate?
Only 4 external components are required.
- What is the frequency of the internal oscillator in the LM2574N-ADJ?
The internal oscillator frequency is 52 kHz.
- Does the LM2574N-ADJ have thermal shutdown protection?
Yes, it includes thermal shutdown protection.
- What is the typical efficiency of the LM2574N-ADJ?
The typical efficiency is around 77%.
- Can the LM2574N-ADJ be used in high-temperature environments?
Yes, it operates within a junction temperature range of -40°C to +125°C.
- Does the LM2574N-ADJ have current limit protection?
Yes, it includes cycle-by-cycle current limiting for protection.
- Is the LM2574N-ADJ suitable for automotive applications?
Yes, it is suitable for automotive and other high-reliability applications.
