Overview
The LM2576S-ADJ/NOPB is a monolithic integrated circuit designed by Texas Instruments, serving as a high-efficiency step-down (buck) switching regulator. This device is capable of driving a 3-A load with excellent line and load regulation, making it suitable for a wide range of power management applications. It is available in fixed output voltages of 3.3 V, 5 V, 12 V, 15 V, and an adjustable output version, with the adjustable version offering an output voltage range from 1.23 V to 37 V (up to 57 V for the HV version).
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| Vin (min) | 4 | V | ||
| Vin (max) | 40 (60 for HV version) | V | ||
| Vout (min) | 1.23 | V | ||
| Vout (max) | 37 (57 for HV version) | V | ||
| Iout (max) | 3 | A | ||
| Iq (typ) | 5 | mA | ||
| Switching frequency (min) | 42 | kHz | ||
| Switching frequency (max) | 63 | kHz | ||
| Operating temperature range | -40 | 125 | °C | |
| Package | TO-263 (KTT)-5 |
Key Features
- High Efficiency: Provides high efficiency in stepping down voltage, reducing power dissipation and the need for large heat sinks.
- Wide Input Voltage Range: Supports input voltages up to 40 V (60 V for the HV version), making it versatile for various power supply sources.
- Adjustable Output Voltage: The adjustable version offers an output voltage range from 1.23 V to 37 V (up to 57 V for the HV version).
- Simple Design: Requires only four external components, simplifying the design and implementation process.
- Fixed-Frequency Oscillator: Features a 52-kHz fixed-frequency internal oscillator, ensuring stable and efficient operation.
- TTL-Shutdown Capability: Includes a TTL-compatible shutdown feature with a low-power standby mode, consuming only 50-µA typical standby current.
- Overcurrent Protection and Thermal Shutdown: Offers cycle-by-cycle current limiting and thermal shutdown for enhanced reliability and protection.
- Digital Signal Processor Compatibility: Ensures reliable operation in digital signal processing applications.
Applications
- Power Supplies and Battery Chargers: Ideal for powering sensitive devices in power supplies, battery chargers, and voltage regulators.
- Consumer Electronics: Suitable for powering consumer electronics such as smartphones, laptops, and tablets.
- Automotive Applications: Can be used in automotive applications where reliable output voltage and current are required.
- Industrial Equipment: Applicable in various industrial settings where high-performance and efficient voltage regulation are necessary.
Q & A
- What is the maximum output current of the LM2576S-ADJ/NOPB?
The LM2576S-ADJ/NOPB supports up to 3A output current.
- Can I use the LM2576S-ADJ/NOPB in automotive applications?
Yes, the LM2576S-ADJ/NOPB is suitable for automotive applications where high performance, efficiency, and reliability are critical.
- What is the operating temperature range of the LM2576S-ADJ/NOPB?
The operating temperature range is from -40°C to 125°C.
- What is the typical switching frequency of the LM2576S-ADJ/NOPB?
The switching frequency ranges from 42 kHz to 63 kHz.
- Does the LM2576S-ADJ/NOPB have built-in protection mechanisms?
Yes, it includes overcurrent protection and thermal shutdown for enhanced reliability.
- How many external components are required for the LM2576S-ADJ/NOPB?
It requires only four external components for operation.
- What is the input voltage range for the LM2576S-ADJ/NOPB?
The input voltage range is from 4 V to 40 V (up to 60 V for the HV version).
- Is the LM2576S-ADJ/NOPB compatible with digital signal processing applications?
Yes, it ensures reliable operation in digital signal processing applications.
- What are the equivalent alternatives to the LM2576S-ADJ/NOPB?
Alternatives include the LM2596S-ADJ/NOPB from Texas Instruments and the LT1376CN8-5 from Analog Devices.
- How does the LM2576S-ADJ/NOPB regulate the output voltage?
The LM2576S-ADJ/NOPB regulates the output voltage by adjusting the duty cycle of a high-frequency oscillator, providing a constant voltage output even with varying input voltages and loads.
