STMicroelectronics
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L4988MD
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L4988MD

Product Overview

  • Category: Integrated Circuit (IC)
  • Use: Power Management
  • Characteristics:
    • High voltage, high current step-down switching regulator
    • Wide input voltage range
    • Adjustable output voltage
    • Current mode control
    • Internal compensation network
  • Package: PowerSO-10 package
  • Essence: Efficient power management solution for various applications
  • Packaging/Quantity: Available in tape and reel packaging, quantity varies based on supplier

Specifications

  • Input Voltage Range: 4.75V to 48V
  • Output Voltage Range: 0.8V to VIN
  • Switching Frequency: Up to 500 kHz
  • Maximum Output Current: 2.5A
  • Operating Temperature Range: -40°C to +125°C

Pin Configuration

The L4988MD IC has the following pin configuration:

  1. VCC - Supply voltage input
  2. GND - Ground reference
  3. FB - Feedback pin for output voltage regulation
  4. COMP - Compensation pin for stability control
  5. SS/TR - Soft-start/tracking pin
  6. RT/CLK - External resistor or clock input for frequency control
  7. EN - Enable pin for turning the device on/off
  8. PGND - Power ground reference
  9. SW - Switching node connection
  10. BOOT - Bootstrap capacitor connection

Functional Features

  • High efficiency step-down voltage conversion
  • Wide input voltage range allows for versatile applications
  • Adjustable output voltage for flexibility
  • Current mode control provides excellent line and load regulation
  • Internal compensation network simplifies design
  • Protection features like thermal shutdown and overcurrent protection

Advantages and Disadvantages

Advantages: - High efficiency power conversion - Wide input voltage range - Adjustable output voltage - Internal compensation network simplifies design

Disadvantages: - Limited maximum output current (2.5A) - Requires external components for operation

Working Principles

The L4988MD is a high voltage, high current step-down switching regulator. It operates on the principle of pulse width modulation (PWM) to regulate the output voltage. The input voltage is stepped down to the desired output voltage by controlling the duty cycle of the internal power switch. The current mode control ensures stable and efficient operation by adjusting the duty cycle based on the feedback signal.

Detailed Application Field Plans

The L4988MD is suitable for various applications that require efficient power management. Some potential application fields include:

  1. Industrial automation systems
  2. Automotive electronics
  3. Power supplies for consumer electronics
  4. LED lighting systems
  5. Battery charging circuits

Detailed and Complete Alternative Models

  1. LM2596 - Buck converter IC with similar specifications
  2. LT1370 - High efficiency step-down switching regulator
  3. TPS5430 - Wide input voltage range buck converter IC

These alternative models offer similar functionality and can be considered as alternatives to the L4988MD based on specific requirements.

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Seznam 10 běžných otázek a odpovědí souvisejících s aplikací L4988MD v technických řešeních

Sure! Here are 10 common questions and answers related to the application of L4988MD in technical solutions:

  1. Q: What is L4988MD? A: L4988MD is a high voltage, high current stepper motor driver IC used for driving bipolar stepper motors.

  2. Q: What is the maximum voltage and current rating of L4988MD? A: The maximum voltage rating is 50V and the maximum current rating is 3.5A.

  3. Q: Can L4988MD be used with both unipolar and bipolar stepper motors? A: No, L4988MD is specifically designed for bipolar stepper motors only.

  4. Q: How does L4988MD control the stepper motor? A: L4988MD uses a chopper drive technique to regulate the current flowing through the motor windings.

  5. Q: What is the input voltage range for L4988MD? A: The input voltage range is typically between 8V and 35V.

  6. Q: Does L4988MD require any external components for operation? A: Yes, L4988MD requires external components such as capacitors, resistors, and diodes for proper operation.

  7. Q: Can L4988MD handle microstepping? A: Yes, L4988MD supports microstepping up to 1/16th step resolution.

  8. Q: Is L4988MD protected against overcurrent and thermal shutdown? A: Yes, L4988MD has built-in protection features like overcurrent protection and thermal shutdown.

  9. Q: Can L4988MD be used in applications requiring high torque at low speeds? A: Yes, L4988MD can provide high torque at low speeds due to its chopper drive technique.

  10. Q: What is the typical application of L4988MD? A: L4988MD is commonly used in applications like 3D printers, CNC machines, robotics, and other motion control systems.

Please note that these answers are general and may vary depending on the specific implementation and requirements of your technical solution.