Overview
The LM2575D2T-5R4G, produced by onsemi, is a monolithic integrated circuit designed for easy and convenient implementation of a step-down (buck) switching regulator. This device is part of the LM2575 series, which is ideal for applications requiring high efficiency and minimal external components. The LM2575 series includes fixed output voltage versions (3.3 V, 5.0 V, 12 V, 15 V) and an adjustable output version, making it versatile for various power supply designs. The high efficiency of the LM2575, especially at higher input voltages, reduces the need for a heatsink, or significantly minimizes its size, compared to traditional three-terminal linear regulators.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 4.75 to 40 | V |
| Output Voltage (Fixed Versions) | 3.3 V, 5.0 V, 12 V, 15 V | V |
| Output Voltage (Adjustable Version) | 1.23 V to 37 V ±4% | V |
| Output Current | 1.0 A | A |
| Oscillator Frequency | 52 kHz ±10% (±2% over 0°C to 125°C) | kHz |
| Operating Junction Temperature Range | –40°C to 125°C | °C |
| Thermal Shutdown | Yes | |
| Current Limiting | Cycle-by-cycle | |
| Standby Current | 80 μA typical | μA |
| Package Type | D2PAK (TO-263) |
Key Features
- High efficiency, especially at higher input voltages, reducing the need for a heatsink.
- Guaranteed ±4% tolerance on output voltage within specified input voltages and output load conditions.
- Fixed 52 kHz internal oscillator frequency with ±10% tolerance (±2% over 0°C to 125°C).
- Requires only four external components for operation.
- Uses readily available standard inductors from various manufacturers.
- TTL shutdown capability with low power standby mode.
- Cycle-by-cycle current limiting and thermal shutdown for full protection under fault conditions.
- AEC-Q100 qualified and PPAP capable for automotive and other critical applications.
Applications
- Simple high-efficiency step-down (buck) regulators.
- Pre-regulator for linear regulators.
- On-card switching regulators.
- Positive-to-negative converter (buck-boost) configurations.
- Automotive and industrial power supply systems.
- General-purpose DC-DC conversion in various electronic devices.
Q & A
- What is the input voltage range of the LM2575D2T-5R4G?
The input voltage range is from 4.75 V to 40 V.
- What are the available fixed output voltage options for the LM2575 series?
The fixed output voltage options are 3.3 V, 5.0 V, 12 V, and 15 V.
- What is the adjustable output voltage range of the LM2575?
The adjustable output voltage range is from 1.23 V to 37 V with a ±4% tolerance.
- What is the maximum output current of the LM2575?
The maximum output current is 1.0 A.
- Does the LM2575 have thermal shutdown protection?
Yes, the LM2575 includes thermal shutdown protection.
- What is the oscillator frequency of the LM2575?
The oscillator frequency is 52 kHz with a ±10% tolerance (±2% over 0°C to 125°C).
- How many external components are required for the LM2575 to operate?
The LM2575 requires only four external components for operation.
- Is the LM2575 suitable for automotive applications?
Yes, the LM2575 is AEC-Q100 qualified and PPAP capable, making it suitable for automotive and other critical applications.
- What is the typical standby current of the LM2575?
The typical standby current is 80 μA.
- Does the LM2575 have cycle-by-cycle current limiting?
Yes, the LM2575 includes cycle-by-cycle current limiting for protection.
