Linear Technology/Analog Devices
Bild kan vara representation.
Se specifikationer för produktinformation.
LT3840HFE#PBF
Visa detalj Datablad

LT3840HFE#PBF

Product Overview

Category: Integrated Circuit (IC)

Use: Power Management

Characteristics: - High Efficiency - Wide Input Voltage Range - Adjustable Output Voltage - Synchronous Rectification - Current Mode Control - Programmable Soft-Start - Overvoltage Protection - Undervoltage Lockout - Thermal Shutdown

Package: HFE Package (16-Lead TSSOP)

Essence: The LT3840HFE#PBF is a high-efficiency synchronous step-down DC/DC converter. It is designed to provide a regulated output voltage from a wide input voltage range.

Packaging/Quantity: The LT3840HFE#PBF is available in a 16-Lead TSSOP package. It is typically sold in reels of 2500 units.

Specifications

  • Input Voltage Range: 4V to 60V
  • Output Voltage Range: 0.8V to VIN
  • Maximum Output Current: 5A
  • Switching Frequency: Up to 1MHz
  • Efficiency: Up to 95%
  • Operating Temperature Range: -40°C to 125°C

Detailed Pin Configuration

The LT3840HFE#PBF has the following pin configuration:

  1. VIN: Input Voltage
  2. GND: Ground
  3. FB: Feedback Pin
  4. SYNC/SS: Synchronization/Soft-Start Pin
  5. VCC: Supply Voltage
  6. SW: Switch Node
  7. PGND: Power Ground
  8. SS/TR: Soft-Start/Tracking Pin
  9. COMP: Compensation Pin
  10. RT/CLKOUT: Timing Resistor/Clock Output Pin
  11. CLKIN: Clock Input Pin
  12. VSENSE+: Positive Sense Input
  13. VSENSE-: Negative Sense Input
  14. BOOT: Bootstrap Pin
  15. BST: Boost Pin
  16. VOUT: Output Voltage

Functional Features

  • High Efficiency: The LT3840HFE#PBF utilizes synchronous rectification and current mode control to achieve high efficiency.
  • Wide Input Voltage Range: It can accept input voltages ranging from 4V to 60V, making it suitable for a wide range of applications.
  • Adjustable Output Voltage: The output voltage can be adjusted from 0.8V to the input voltage.
  • Programmable Soft-Start: The soft-start time can be programmed using an external capacitor connected to the SS/TR pin.
  • Overvoltage Protection: The LT3840HFE#PBF includes overvoltage protection to prevent damage to the circuit in case of voltage spikes.
  • Undervoltage Lockout: It features undervoltage lockout to ensure proper operation under low input voltage conditions.
  • Thermal Shutdown: The device incorporates thermal shutdown protection to prevent overheating.

Advantages and Disadvantages

Advantages: - High efficiency leads to reduced power dissipation and longer battery life. - Wide input voltage range allows for versatile applications. - Adjustable output voltage provides flexibility in system design. - Synchronous rectification improves overall efficiency. - Current mode control enhances stability and transient response. - Programmable soft-start reduces inrush current during startup. - Overvoltage protection safeguards against voltage spikes. - Undervoltage lockout ensures reliable operation at low input voltages. - Thermal shutdown protects the device from overheating.

Disadvantages: - Limited maximum output current (5A) may not be sufficient for high-power applications. - Requires additional external components for proper operation.

Working Principles

The LT3840HFE#PBF is a step-down DC/DC converter that uses a synchronous rectification topology. It operates by switching the input voltage across an inductor and then rectifying it to provide a regulated output voltage. The device uses current mode control to regulate the output voltage and maintain stability.

During operation, the input voltage is connected to the VIN pin, and the desired output voltage is set using external resistors or feedback components connected to the FB pin. The LT3840HFE#PBF generates a high-frequency clock signal that controls the switching of the internal power MOSFETs. This switching action allows energy to be transferred from the input to the output through the inductor.

The LT3840HFE#PBF continuously monitors the output voltage and adjusts the duty cycle of the switching signal to maintain a stable output voltage. It also includes various protection features such as overvoltage protection, undervoltage lockout, and thermal shutdown to ensure safe and reliable operation.

Detailed Application Field Plans

The LT3840HFE#PBF can be used in various applications, including but not limited to: - Industrial Power Supplies - Automotive Electronics - Telecommunications Equipment - Battery-Powered Systems - LED Lighting - Distributed Power

Lista 10 Vanliga frågor och svar relaterade till tillämpningen av LT3840HFE#PBF i tekniska lösningar

Sure! Here are 10 common questions and answers related to the application of LT3840HFE#PBF in technical solutions:

  1. Q: What is the LT3840HFE#PBF? A: The LT3840HFE#PBF is a high voltage synchronous step-down DC/DC controller designed for use in various power supply applications.

  2. Q: What is the input voltage range of the LT3840HFE#PBF? A: The LT3840HFE#PBF can accept an input voltage range from 4V to 60V.

  3. Q: What is the output voltage range of the LT3840HFE#PBF? A: The LT3840HFE#PBF can generate output voltages as low as 0.8V and as high as VIN.

  4. Q: What is the maximum output current of the LT3840HFE#PBF? A: The LT3840HFE#PBF can deliver a maximum output current of up to 20A.

  5. Q: Can the LT3840HFE#PBF operate in a wide temperature range? A: Yes, the LT3840HFE#PBF is designed to operate in a temperature range from -40°C to 125°C.

  6. Q: Does the LT3840HFE#PBF require an external compensation network? A: No, the LT3840HFE#PBF features internal compensation, eliminating the need for an external compensation network.

  7. Q: Can the LT3840HFE#PBF be synchronized to an external clock? A: Yes, the LT3840HFE#PBF supports synchronization to an external clock for precise timing control.

  8. Q: What protection features does the LT3840HFE#PBF offer? A: The LT3840HFE#PBF provides various protection features, including overvoltage protection, overcurrent protection, and thermal shutdown.

  9. Q: Can the LT3840HFE#PBF be used in automotive applications? A: Yes, the LT3840HFE#PBF is suitable for automotive applications as it meets the necessary automotive specifications.

  10. Q: Are there any evaluation boards or reference designs available for the LT3840HFE#PBF? A: Yes, Linear Technology (now part of Analog Devices) provides evaluation boards and reference designs to help users get started with the LT3840HFE#PBF in their applications.

Please note that the answers provided here are general and may vary depending on specific application requirements. It is always recommended to refer to the datasheet and application notes for detailed information.