LM5021MM-2

Product Overview

Category: Integrated Circuit (IC)

Use: Power Management

Characteristics: - High voltage buck controller - Wide input voltage range - Adjustable output voltage - Current mode control - Protection features (overvoltage, undervoltage, overcurrent)

Package: 8-Pin VSSOP

Essence: The LM5021MM-2 is a high voltage buck controller IC used in power management applications. It offers a wide input voltage range and adjustable output voltage, making it suitable for various power supply designs.

Packaging/Quantity: The LM5021MM-2 is available in an 8-pin VSSOP package. It is typically sold in reels or tubes containing multiple units.

Specifications

• Input Voltage Range: 9V to 100V
• Output Voltage Range: 0.8V to VIN
• Switching Frequency: Up to 1MHz
• Maximum Duty Cycle: 90%
• Operating Temperature Range: -40°C to 125°C

Pin Configuration

The LM5021MM-2 has the following pin configuration:

1. COMP: Compensation pin for loop stability.
2. FB: Feedback pin for setting the output voltage.
3. CS: Current sense pin for current mode control.
4. SS/TR: Soft-start/Tracking pin for controlling start-up behavior.
5. GND: Ground reference for the IC.
6. VCC: Supply voltage input for the IC.
7. DRVH: High-side gate driver output.
8. DRVL: Low-side gate driver output.

Functional Features

• Current mode control for improved transient response and cycle-by-cycle current limiting.
• Adjustable soft-start for controlled start-up behavior.
• Overvoltage protection (OVP) and undervoltage lockout (UVLO) for system protection.
• Overcurrent protection (OCP) with adjustable threshold for load protection.
• Error amplifier with compensation pin for loop stability.

Advantages and Disadvantages

Advantages: - Wide input voltage range allows for versatile power supply designs. - Adjustable output voltage provides flexibility in meeting specific requirements. - Current mode control enhances transient response and current limiting capabilities. - Protection features ensure system reliability and safety.

Disadvantages: - Limited maximum duty cycle may restrict certain applications. - Requires external components for complete power supply implementation. - Sensitive to noise and layout considerations due to high switching frequency.

Working Principles

The LM5021MM-2 operates as a high voltage buck controller, regulating the output voltage based on the feedback signal. It utilizes current mode control, where the current flowing through the power switch is sensed and used for controlling the duty cycle of the switch. This control mechanism enables improved transient response and cycle-by-cycle current limiting.

The IC incorporates various protection features such as overvoltage protection (OVP), undervoltage lockout (UVLO), and overcurrent protection (OCP). These safeguards ensure the safe operation of the power supply and protect against abnormal conditions.

Detailed Application Field Plans

The LM5021MM-2 can be applied in various power management scenarios, including but not limited to: - Industrial power supplies - Telecom infrastructure - Automotive electronics - Renewable energy systems - LED lighting

Its wide input voltage range, adjustable output voltage, and robust protection features make it suitable for diverse applications requiring efficient power conversion.

Detailed and Complete Alternative Models

• LM5020: Similar high voltage buck controller with slightly different specifications.
• LM5113: High voltage half-bridge gate driver with integrated bootstrap diode.
• LM25066: Multi-channel hot-swap controller with integrated power MOSFETs.

These alternative models offer similar functionality and can be considered based on specific application requirements.

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