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LM5155DSSR

DC/DC Cntrlr Single-OUT Step Up 2200kHz 12-Pin WSON EP T/R

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Overview of LM5155DSSR

The LM5155DSSR is a high efficiency non-synchronous buck controller from Texas Instruments.This controller features a wide input voltage range and high switching frequency,making it suitable for various power management applications.

Pinout

(Note:The pin configuration below is a general representation.Refer to the specific datasheet for precise details.)

  • PH:Power High-Side Gate Drive
  • VIN:Input Voltage
  • PGND:Power Ground
  • BST:Bootstrap Supply for High-Side Gate Driver
  • AGND:Analog Ground
  • COMP:Compensation Pin
  • FB:Feedback Pin
  • RT/CLK:External Resistor or Clock Synchronization
  • SS/TR:Soft-Start/Tracking
  • EN:Enable Pin
  • PG:Power Good Indicator
  • SS/TR:Soft-Start/Tracking
  • SS:Soft-Start Pin
  • UV:Under Voltage Lockout
  • PG:Power Good

Circuit Diagram

Include a circuit diagram illustrating the connections and operation of the LM5155DSSR IC for a visual representation.

Key Features

  • High Efficiency: The LM5155DSSR offers high efficiency power conversion, reducing power losses in the system.
  • Wide Input Voltage Range: This controller can support a wide input voltage range, making it versatile for different input sources.
  • High Switching Frequency: With a high switching frequency, the LM5155DSSR enables compact and efficient designs.
  • Adjustable Soft-Start: The soft-start feature allows for controlled start-up and reduces inrush current.
  • Protection Features: The IC includes various protection features such as overcurrent protection and thermal shutdown for system reliability.

Note: For detailed technical specifications, please refer to the LM5155DSSR datasheet.

Application

  • Power Management: Ideal for use in power supplies, LED drivers, and other power management systems.
  • Battery Charging: Suitable for battery charger applications requiring high efficiency and precise voltage regulation.
  • LED Lighting: Can be used in LED lighting systems for efficient power conversion and control.

Functionality

The LM5155DSSR is a versatile non-synchronous buck controller that provides efficient power conversion with high performance and reliability.It is designed to meet the power management needs of various applications.

Usage Guide

  • Input Power: Connect VIN (Pin 2) to the input voltage source within the specified range.
  • Feedback: Connect the FB (Pin 7) pin to the output voltage feedback network for regulation.
  • Enable Control: Use the EN (Pin 10) pin to enable or disable the device as needed.

Frequently Asked Questions

Q: What is the maximum input voltage the LM5155DSSR can handle?
A: The LM5155DSSR can handle a maximum input voltage specified in its datasheet, typically ranging from 4.5V to 55V.

Q: Does the LM5155DSSR include overtemperature protection?
A: Yes, the LM5155DSSR features overtemperature protection to prevent thermal damage under high operating temperatures.

Equivalent

For similar functionalities, consider these alternatives to the LM5155DSSR:

  • LM53603: A high efficiency synchronous step-down converter from Texas Instruments offering similar performance in a different package.
  • LT8612: This is a high efficiency 42V synchronous buck controller from Analog Devices, providing comparable features to the LM5155DSSR.

Specifications

The followings are basic parameters of the part selected concerning the characteristics of the part and categories it belongs to.

Topology Boost, Flyback, SEPIC Vin (min) (V) 1.5
Vin (max) (V) 45 Vout (min) (V) 1.5
Vout (max) (V) 300 Regulated outputs (#) 1
Switching frequency (min) (kHz) 100 Switching frequency (max) (kHz) 2200
Iq (typ) (mA) 0.45 Features Adjustable current limit, Frequency synchronization, Nonsynchronous rectification, Power good, UVLO adjustable
Duty cycle (max) (%) 93 TI functional safety category Functional Safety-Capable
Rating Catalog Operating temperature range (°C) -40 to 125
Type Controller

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