LM3503SQX-44

Product Overview

Category: Integrated Circuits (ICs)

Use: Voltage Regulator

Characteristics: - High efficiency - Low dropout voltage - Wide input voltage range - Adjustable output voltage - Current limit protection - Thermal shutdown protection

Package: 44-pin LLP (Leadless Leadframe Package)

Essence: The LM3503SQX-44 is a voltage regulator IC designed to provide a stable and regulated output voltage for various electronic devices.

Packaging/Quantity: The LM3503SQX-44 is typically sold in reels or tubes, with a quantity of 250 units per reel/tube.

Specifications

• Input Voltage Range: 2.7V to 5.5V
• Output Voltage Range: 0.6V to VIN
• Maximum Output Current: 1A
• Dropout Voltage: 200mV at 1A
• Quiescent Current: 50µA
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The LM3503SQX-44 has a total of 44 pins. Here is the detailed pin configuration:

1. VOUT
2. GND
3. EN
4. FB
5. SS
6. COMP
7. BST
8. SW
9. SW
10. SW
11. SW
12. SW
13. SW
14. SW
15. SW
16. SW
17. SW
18. SW
19. SW
20. SW
21. SW
22. SW
23. SW
24. SW
25. SW
26. SW
27. SW
28. SW
29. SW
30. SW
31. SW
32. SW
33. SW
34. SW
35. SW
36. SW
37. SW
38. SW
39. SW
40. SW
41. SW
42. SW
43. SW
44. VIN

Functional Features

• High Efficiency: The LM3503SQX-44 utilizes advanced circuitry to achieve high efficiency, minimizing power loss and maximizing battery life.
• Low Dropout Voltage: With a dropout voltage of only 200mV at 1A, the LM3503SQX-44 can maintain a stable output voltage even when the input voltage is close to the desired output voltage.
• Wide Input Voltage Range: The IC can accept input voltages ranging from 2.7V to 5.5V, making it suitable for a wide range of applications.
• Adjustable Output Voltage: The output voltage can be adjusted using an external resistor divider network, allowing flexibility in meeting specific voltage requirements.
• Current Limit Protection: The LM3503SQX-44 incorporates current limit protection to prevent excessive current flow, protecting both the IC and the connected devices.
• Thermal Shutdown Protection: In case of excessive temperature rise, the IC automatically shuts down to prevent damage, ensuring safe operation.

Advantages and Disadvantages

Advantages: - High efficiency design - Wide input voltage range - Adjustable output voltage - Current limit and thermal shutdown protection

Disadvantages: - Limited maximum output current (1A)

Working Principles

The LM3503SQX-44 operates as a step-down voltage regulator. It takes the higher input voltage and converts it to a lower, regulated output voltage. This is achieved through a combination of switching elements, control circuitry, and feedback mechanisms. The IC continuously monitors the output voltage and adjusts the switching elements to maintain a stable output voltage, regardless of changes in the input voltage or load conditions.

Detailed Application Field Plans

The LM3503SQX-44 is commonly used in various applications, including but not limited to: - Portable electronic devices - Battery-powered systems - IoT (Internet of Things) devices - Wearable devices - Embedded systems

Detailed and Complete Alternative Models

Some alternative models that offer similar functionality to the LM3503SQX-44 include: - LM317: Adjustable Voltage Regulator - LM1117: Low Dropout Voltage Regulator - LT1084: Adjustable Linear Regulator - TPS5430: Step-Down Switching Regulator - MAX15062: High-Efficiency Step-Down Converter

These alternative models can be considered based on specific requirements and design constraints.

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