Overview
The LM2587T-ADJ/NOPB, produced by Texas Instruments, is a versatile and highly efficient step-up (boost) and flyback regulator. This monolithic integrated circuit is designed to operate over a wide input voltage range of 4V to 40V and can deliver up to 5A of output current. The LM2587 is available in various output voltage versions, including fixed outputs of 3.3V, 5V, and 12V, as well as an adjustable output version. This regulator is known for its simplicity, requiring a minimal number of external components, making it cost-effective and easy to implement in various power supply designs.
Key Specifications
| Parameter | Typical | Minimum | Maximum | Unit |
|---|---|---|---|---|
| Input Voltage Range | - | -0.4 | 45 | V |
| Switch Voltage | - | -0.4 | 65 | V |
| Switch Current | - | - | 5 | A |
| Output Voltage (Adjustable) | 1.23 | - | 60 | V |
| Output Current | - | - | 5 | A |
| Switching Frequency | 100 | - | - | kHz |
| Efficiency (Typical) | 75-90% | - | - | % |
| Operating Temperature Range | - | -40 | 125 | °C |
| Package Types | DDPAK/TO-263, TO-220 | - | - | - |
Key Features
- Wide input voltage range: 4V to 40V
- High current capability: up to 5A
- Current-mode operation for improved transient response, line regulation, and current limit
- Internal soft-start function to reduce in-rush current during start-up
- Output transistor protected by current limit, undervoltage lockout, and thermal shutdown
- System output voltage tolerance of ±4% over line and load conditions
- Fixed switching frequency of 100 kHz
- Minimal external components required
- Available in fixed and adjustable output voltage versions
Applications
- Flyback regulators
- Multiple-output regulators
- Simple boost regulators
- Forward converters
Q & A
- What is the input voltage range of the LM2587T-ADJ/NOPB?
The input voltage range is from 4V to 40V.
- What is the maximum output current of the LM2587T-ADJ/NOPB?
The maximum output current is up to 5A.
- What are the available output voltage versions for the LM2587T-ADJ/NOPB?
The available versions include fixed outputs of 3.3V, 5V, and 12V, as well as an adjustable output version.
- What is the switching frequency of the LM2587T-ADJ/NOPB?
The switching frequency is fixed at 100 kHz.
- Does the LM2587T-ADJ/NOPB have built-in protection features?
Yes, it includes current limit, undervoltage lockout, and thermal shutdown protection.
- What is the typical efficiency of the LM2587T-ADJ/NOPB?
The typical efficiency ranges from 75% to 90% depending on the operating conditions.
- What are the common applications of the LM2587T-ADJ/NOPB?
Common applications include flyback regulators, multiple-output regulators, simple boost regulators, and forward converters.
- What package types are available for the LM2587T-ADJ/NOPB?
The device is available in DDPAK/TO-263 and TO-220 packages.
- Does the LM2587T-ADJ/NOPB require many external components?
No, it requires a minimal number of external components, making it simple to use and cost-effective.
- How does the internal soft-start function benefit the LM2587T-ADJ/NOPB?
The internal soft-start function reduces in-rush current during start-up, which helps in preventing damage to the device and improving overall system reliability.
