L99LD21Q6TR

Product Overview

• Category: Integrated Circuit (IC)
• Use: Power Management
• Characteristics: High efficiency, compact size, low power consumption
• Package: QFN (Quad Flat No-Lead)
• Essence: Power management IC for automotive applications
• Packaging/Quantity: Tape and reel, 3000 units per reel

Specifications

• Input Voltage Range: 4.5V to 40V
• Output Voltage Range: 0.8V to 5.5V
• Maximum Output Current: 2A
• Operating Temperature Range: -40°C to +125°C
• Efficiency: Up to 95%
• Switching Frequency: 500kHz

Detailed Pin Configuration

The L99LD21Q6TR has a total of 20 pins. The pin configuration is as follows:

1. VIN: Input voltage
2. GND: Ground
3. EN: Enable pin
4. VOUT: Output voltage
5. FB: Feedback pin
6. COMP: Compensation pin
7. SS: Soft-start pin
8. PGND: Power ground
9. BST: Bootstrap pin
10. SW: Switch pin
11. AGND: Analog ground
12. NC: Not connected
13. NC: Not connected
14. NC: Not connected
15. NC: Not connected
16. NC: Not connected
17. NC: Not connected
18. NC: Not connected
19. NC: Not connected
20. NC: Not connected

Functional Features

• Wide input voltage range allows for versatile applications
• High efficiency ensures minimal power loss
• Compact size enables space-saving designs
• Low power consumption reduces energy usage
• Enable pin provides control over the device's operation
• Soft-start feature prevents excessive inrush current during startup

Advantages and Disadvantages

Advantages: - Wide input voltage range allows for compatibility with various power sources - High efficiency results in reduced heat dissipation and longer battery life - Compact size enables integration into small form factor devices - Low power consumption reduces energy costs and environmental impact - Enable pin provides flexibility in controlling the device's operation

Disadvantages: - Limited maximum output current may not be suitable for high-power applications - Operating temperature range may restrict usage in extreme environments - Switching frequency may cause electromagnetic interference in sensitive systems

Working Principles

The L99LD21Q6TR is a power management IC designed for automotive applications. It utilizes a switching regulator topology to efficiently convert the input voltage to a regulated output voltage. The device incorporates various protection features such as overvoltage protection, undervoltage lockout, and thermal shutdown to ensure safe and reliable operation.

Detailed Application Field Plans

The L99LD21Q6TR is commonly used in automotive electronics, including:

1. Engine control units (ECUs)
2. Body control modules (BCMs)
3. Lighting systems
4. Infotainment systems
5. Advanced driver-assistance systems (ADAS)
6. Electric power steering (EPS) systems
7. Battery management systems (BMS)

Detailed and Complete Alternative Models

1. L99LD21Q5TR: Similar to L99LD21Q6TR but with a lower maximum output current of 1.5A.
2. L99LD21Q7TR: Similar to L99LD21Q6TR but with a higher maximum output current of 3A.
3. L99LD21Q8TR: Similar to L99LD21Q6TR but with extended operating temperature range (-40°C to +150°C).

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