Overview
The LM2575T-15G, produced by onsemi, is a high-efficiency step-down switching voltage regulator. This device is part of the LM2575 series, known for its simplicity and robust performance. It is designed to deliver up to 1 A of load current with excellent line and load regulation. The LM2575T-15G is particularly useful in applications requiring a fixed output voltage of 15 V, with an adjustable version also available for output voltages ranging from 1.23 V to 37 V.
This regulator features a fixed-frequency internal oscillator at 52 kHz, which ensures stable operation and minimizes the need for external components. The device includes cycle-by-cycle current limiting and thermal shutdown for protection against fault conditions, making it a reliable choice for various power supply applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Voltage Range | 4.75 | - | 40 | V |
| Output Voltage (Fixed 15V Version) | 14.7 | 15 | 15.3 | V |
| Output Current | - | - | 1.0 | A |
| Oscillator Frequency | 42 | 52 | 63 | kHz |
| Efficiency (Typical at Vin = 18V, ILoad = 1A) | - | - | 88% | % |
| Maximum Junction Temperature | - | - | 150 | °C |
| Thermal Resistance (Junction-to-Ambient) | - | - | 65 | °C/W |
| Standby Quiescent Current (ON/OFF Pin = 5V) | 15 | 80 | 200 | μA |
Key Features
- High Efficiency: Up to 88% efficiency, significantly reducing heat dissipation and the need for large heatsinks.
- Wide Input Voltage Range: Operates from 4.75 V to 40 V, making it versatile for various power supply applications.
- Fixed and Adjustable Output Versions: Available in fixed output voltages (3.3 V, 5 V, 12 V, 15 V) and an adjustable version (1.23 V to 37 V).
- Internal Oscillator: 52 kHz fixed-frequency internal oscillator for stable operation.
- Current Limiting and Thermal Shutdown: Cycle-by-cycle current limiting and thermal shutdown for protection against fault conditions.
- TTL Shutdown Capability: Low power standby mode with TTL-compatible shutdown pin.
- Low Component Count: Requires only four external components for operation.
- AEC-Q100 Qualified: Suitable for automotive and other applications requiring high reliability and unique site and control change requirements.
Applications
- Power Supplies: Ideal for building efficient power supplies, especially where space and heat dissipation are critical.
- Battery Chargers: Used in battery charging systems due to its high efficiency and reliable operation.
- Industrial Control Systems: Suitable for industrial control systems requiring stable and efficient power regulation.
- Automotive Systems: AEC-Q100 qualified, making it suitable for automotive applications.
- Consumer Electronics: Used in various consumer electronics where efficient power conversion is necessary.
Q & A
- What is the maximum output current of the LM2575T-15G?
The maximum output current is 1.0 A.
- What is the input voltage range for the LM2575T-15G?
The input voltage range is from 4.75 V to 40 V.
- What is the typical efficiency of the LM2575T-15G at full load?
The typical efficiency is up to 88% at full load.
- Does the LM2575T-15G have built-in protection features?
Yes, it includes cycle-by-cycle current limiting and thermal shutdown for protection.
- What is the oscillator frequency of the LM2575T-15G?
The oscillator frequency is 52 kHz.
- Is the LM2575T-15G suitable for automotive applications?
Yes, it is AEC-Q100 qualified and suitable for automotive applications.
- How many external components are required for the LM2575T-15G to operate?
Only four external components are required.
- What is the maximum junction temperature for the LM2575T-15G?
The maximum junction temperature is 150°C.
- Does the LM2575T-15G have a TTL-compatible shutdown pin?
Yes, it has a TTL-compatible shutdown pin for low power standby mode.
- What is the thermal resistance (junction-to-ambient) of the LM2575T-15G in the TO-220 package?
The thermal resistance is 65°C/W.
