Overview
The LM2576D2T-ADJR4 is a step-down switching regulator produced by onsemi. This monolithic integrated circuit is designed for easy and convenient implementation of a step-down (buck) converter. It is part of the LM2576 series, which is known for its high efficiency and simplicity in power supply design. The LM2576D2T-ADJR4 is capable of driving a 3.0 A load with excellent line and load regulation, making it suitable for a variety of applications requiring reliable and efficient power conversion.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage (Min) | 7 | V |
| Input Voltage (Max) | 40 | V |
| Output Voltage | Fixed: 3.3 V, 5.0 V, 12 V, 15 V; Adjustable: 1.23 to 37 V | V |
| Output Current | 3.0 A | A |
| Switching Frequency | 52 kHz | kHz |
| Minimum Operating Temperature | -40°C | °C |
| Maximum Operating Temperature | 125°C | °C |
| Maximum Junction Temperature | 150°C | °C |
| Thermal Shutdown | Yes | |
| Current Limit Protection | Yes |
Key Features
- Fixed output voltages of 3.3 V, 5.0 V, 12 V, 15 V, and an adjustable output version (1.23 to 37 V ±4%)
- Guaranteed 3.0 A output current
- Wide input voltage range (7 V to 40 V)
- Requires only 4 external components for basic operation
- 52 kHz fixed frequency internal oscillator
- TTL shutdown capability with low power standby mode (approximately 80 μA standby current)
- High efficiency, especially at higher input voltages
- Uses readily available standard inductors
- Thermal shutdown and cycle-by-cycle current limiting for full protection under fault conditions
- Pb-free packages available
Applications
- Simple high-efficiency step-down (buck) regulators
- Efficient pre-regulators for linear regulators
- On-card switching regulators
- Positive to negative converters (buck-boost)
- Negative step-up converters
- Power supplies for battery chargers
Q & A
- What is the input voltage range for the LM2576D2T-ADJR4?
The input voltage range is from 7 V to 40 V.
- What are the available fixed output voltages for the LM2576 series?
The fixed output voltages are 3.3 V, 5.0 V, 12 V, and 15 V.
- What is the maximum output current of the LM2576D2T-ADJR4?
The maximum output current is 3.0 A.
- What is the switching frequency of the LM2576D2T-ADJR4?
The switching frequency is 52 kHz.
- Does the LM2576D2T-ADJR4 have thermal shutdown protection?
Yes, it includes thermal shutdown protection.
- How many external components are required for basic operation of the LM2576D2T-ADJR4?
Only 4 external components are required.
- What is the standby current when the regulator is in shutdown mode?
The standby current is approximately 80 μA.
- Is the LM2576D2T-ADJR4 available in Pb-free packages?
Yes, Pb-free packages are available.
- What types of inductors can be used with the LM2576D2T-ADJR4?
Standard inductors optimized for use with the LM2576 are available from several manufacturers.
- What are some common applications of the LM2576D2T-ADJR4?
Common applications include simple high-efficiency step-down regulators, efficient pre-regulators for linear regulators, on-card switching regulators, and power supplies for battery chargers.
