Overview
The LM2576SX-ADJ is a monolithic integrated circuit from National Semiconductor, now part of Texas Instruments, designed to function as a step-down (buck) switching regulator. This device is part of the LM2576 series, which offers high efficiency and simplicity in designing switch-mode power supplies. The LM2576SX-ADJ is particularly versatile, featuring an adjustable output voltage range from 1.23 V to 37 V, making it suitable for a wide range of applications.
Key Specifications
| Parameter | Value |
|---|---|
| Package | TO-263 (KTT), 5 pins |
| Operating Temperature Range | -40°C to 125°C |
| Maximum Supply Voltage | 40 V (LM2576), 60 V (LM2576HV) |
| Output Current | 3 A |
| Output Voltage Range (Adjustable) | 1.23 V to 37 V (57 V for HV version) |
| Oscillator Frequency | 52 kHz |
| Standby Current | 50 µA (typical) |
| Maximum Junction Temperature | 150°C |
| Storage Temperature | -65°C to 150°C |
Key Features
- Adjustable output voltage range from 1.23 V to 37 V (57 V for HV version)
- Specified 3-A output current
- Wide input voltage range: up to 40 V (60 V for HV version)
- Requires only four external components
- 52-kHz fixed-frequency internal oscillator
- TTL-shutdown capability and low-power standby mode
- High efficiency
- Uses readily available standard inductors
- Cycle-by-cycle current limiting and thermal shutdown for fault protection
Applications
The LM2576SX-ADJ is suitable for various applications requiring efficient step-down voltage regulation. These include but are not limited to:
- Power supplies for electronic devices
- Industrial control systems
- Automotive systems
- Telecommunications equipment
- Consumer electronics
Q & A
- What is the primary function of the LM2576SX-ADJ?
The LM2576SX-ADJ is a step-down (buck) switching regulator. - What is the adjustable output voltage range of the LM2576SX-ADJ?
The adjustable output voltage range is from 1.23 V to 37 V. - What is the maximum output current of the LM2576SX-ADJ?
The maximum output current is 3 A. - What is the operating temperature range of the LM2576SX-ADJ?
The operating temperature range is -40°C to 125°C. - How many external components are required for the LM2576SX-ADJ?
Only four external components are required. - What is the oscillator frequency of the LM2576SX-ADJ?
The oscillator frequency is 52 kHz. - Does the LM2576SX-ADJ have built-in fault protection?
Yes, it includes cycle-by-cycle current limiting and thermal shutdown. - What is the typical standby current of the LM2576SX-ADJ?
The typical standby current is 50 µA. - Can the LM2576SX-ADJ be used in high-temperature environments?
Yes, it can operate up to a maximum junction temperature of 150°C. - Is the LM2576SX-ADJ suitable for automotive applications?
Yes, it is suitable for various applications including automotive systems.
