Overview
The LM2577SX-ADJ/NOPB is a versatile step-up (boost) voltage regulator IC produced by Texas Instruments. This monolithic integrated circuit is designed to provide all the necessary power and control functions for step-up (boost), flyback, and forward converter switching regulators. It is available in an adjustable output voltage version, making it a reliable and efficient solution for various power supply needs.
The device features a wide input voltage range of 3.5V to 40V and can output voltages from 1.23V to 60V. It includes a 3.0A NPN output switch and is packaged in a TO-263-5 (D²PAK) package, which is surface mountable.
Key Specifications
| Parameter | Value | Units |
|---|---|---|
| Input Voltage Range | 3.5 to 40 | V |
| Output Voltage Range | 1.23 to 60 | V |
| Switch Current Limit (Typical) | 3 | A |
| Switching Frequency | 52 kHz | kHz |
| Operating Temperature Range | -40 to 125 | °C |
| Package Type | TO-263-5 (D²PAK) | |
| Number of Regulated Outputs | 1 | |
| Quiescent Current (Typical) | 10 mA | mA |
| Duty Cycle (Maximum) | 95% | % |
Key Features
- Requires few external components, making it cost-effective and simple to use.
- NPN output switches with a current rating of 3.0A and a voltage standoff of 65V.
- Wide input voltage range of 3.5V to 40V and adjustable output voltage from 1.23V to 60V.
- Current-mode operation for improved transient response, line regulation, and current limit.
- 52 kHz internal oscillator, eliminating the need for external components.
- Soft-start function to reduce in-rush current during start-up.
- Output switch protected by current limit, under-voltage lockout, and thermal shutdown.
- Nonsynchronous rectification and UVLO (Under-Voltage Lockout) fixed.
Applications
The LM2577SX-ADJ/NOPB is suitable for a variety of applications requiring efficient voltage boosting. These include:
- Power supplies for industrial and consumer electronics.
- Battery-powered devices that require voltage boosting.
- Automotive systems needing reliable and efficient voltage regulation.
- Medical devices requiring stable and adjustable voltage outputs.
- Telecommunication equipment and networking devices.
Q & A
- Q: What is the input voltage range of the LM2577SX-ADJ/NOPB?
A: The input voltage range is from 3.5V to 40V.
- Q: What is the maximum output voltage of the LM2577SX-ADJ/NOPB?
A: The maximum output voltage is 60V.
- Q: What is the typical switch current limit of the LM2577SX-ADJ/NOPB?
A: The typical switch current limit is 3A.
- Q: What is the switching frequency of the LM2577SX-ADJ/NOPB?
A: The switching frequency is 52 kHz.
- Q: What protection features are included in the LM2577SX-ADJ/NOPB?
A: The device includes current limit, under-voltage lockout, and thermal shutdown protection.
- Q: Can the LM2577SX-ADJ/NOPB handle high current applications?
A: The LM2577SX-ADJ/NOPB is designed to handle moderate current loads. For higher current requirements, consider parallel operation or alternative solutions.
- Q: What is the efficiency of the LM2577SX-ADJ/NOPB under typical operating conditions?
A: The LM2577SX-ADJ/NOPB offers high efficiency levels, typically around 85-90%, under typical operating conditions.
- Q: What package types are available for the LM2577SX-ADJ/NOPB?
A: The device is available in TO-263-5 (D²PAK) and TO-263-6 packages.
- Q: What is the operating temperature range of the LM2577SX-ADJ/NOPB?
A: The operating temperature range is from -40°C to 125°C.
- Q: Does the LM2577SX-ADJ/NOPB require many external components?
A: No, the LM2577SX-ADJ/NOPB requires few external components, making it simple to use and cost-effective.
