Linear Technology/Analog Devices
Obrázek může být reprezentace.
Viz Specifikace pro podrobnosti o produktu.
LT1939IDD

LT1939IDD

Product Overview

  • Category: Integrated Circuit (IC)
  • Use: Power Management
  • Characteristics: High Efficiency, Low Quiescent Current
  • Package: DFN-8
  • Essence: Step-Down Switching Regulator
  • Packaging/Quantity: Tape & Reel, 2500 units per reel

Specifications

  • Input Voltage Range: 2.7V to 5.5V
  • Output Voltage Range: 0.6V to VIN
  • Maximum Output Current: 1.5A
  • Switching Frequency: 1MHz
  • Quiescent Current: 60µA
  • Operating Temperature Range: -40°C to 125°C

Detailed Pin Configuration

The LT1939IDD package consists of 8 pins:

  1. VIN: Input voltage pin
  2. GND: Ground pin
  3. SW: Switch pin for the internal power switch
  4. FB: Feedback pin for output voltage regulation
  5. SS/TR: Soft-start/Tracking pin for controlling startup and tracking functions
  6. SYNC: Synchronization pin for external clock synchronization
  7. PG: Power Good pin indicating output voltage within regulation limits
  8. VOUT: Output voltage pin

Functional Features

  • High efficiency step-down switching regulator
  • Low quiescent current for improved power management
  • Wide input voltage range suitable for various applications
  • Adjustable output voltage for flexibility
  • Soft-start and tracking functions for controlled startup and tracking capabilities
  • Synchronization capability with an external clock source
  • Power Good indicator for monitoring output voltage stability

Advantages and Disadvantages

Advantages: - High efficiency results in reduced power dissipation - Low quiescent current prolongs battery life - Wide input voltage range allows for versatile use - Adjustable output voltage accommodates different requirements - Soft-start and tracking functions ensure controlled startup and tracking capabilities - Synchronization capability provides flexibility in system design - Power Good indicator enhances system monitoring

Disadvantages: - Limited maximum output current of 1.5A - Requires external components for operation

Working Principles

The LT1939IDD is a step-down switching regulator that efficiently converts a higher input voltage to a lower output voltage. It utilizes an internal power switch to control the energy flow and achieve high efficiency. The feedback pin (FB) monitors the output voltage and adjusts the duty cycle of the internal switch to maintain a stable output. The soft-start and tracking functions allow for controlled startup and tracking capabilities, while the synchronization pin (SYNC) enables synchronization with an external clock source. The power good pin (PG) indicates when the output voltage is within regulation limits.

Detailed Application Field Plans

The LT1939IDD is suitable for various applications, including but not limited to:

  1. Portable electronic devices: Provides efficient power management for smartphones, tablets, and portable media players.
  2. Industrial equipment: Enables reliable power supply for industrial automation systems, motor drives, and control circuits.
  3. Automotive electronics: Supports power management in automotive infotainment systems, navigation devices, and lighting controls.
  4. IoT devices: Facilitates power management in Internet of Things (IoT) devices such as smart home appliances and wearable devices.
  5. Battery-powered systems: Optimizes power conversion in battery-operated devices like wireless sensors, medical devices, and handheld instruments.

Detailed and Complete Alternative Models

  1. LT8610ABIDD: Step-Down Switching Regulator, 42V Maximum Input Voltage, 2.5A Maximum Output Current.
  2. LT1763CS8-3.3: Low Dropout Regulator, 16V Maximum Input Voltage, 500mA Maximum Output Current.
  3. LT3080EST#PBF: Adjustable Linear Regulator, 36V Maximum Input Voltage, 1.1A Maximum Output Current.
  4. LT3970EMSE#PBF: Step-Down Switching Regulator, 60V Maximum Input Voltage, 2A Maximum Output Current.
  5. LT3094EDD#PBF: Adjustable Linear Regulator, 40V Maximum Input Voltage, 500mA Maximum Output Current.

These alternative models offer similar functionality and can be considered as substitutes for the LT1939IDD in various applications.

Word count: 525 words

Seznam 10 běžných otázek a odpovědí souvisejících s aplikací LT1939IDD v technických řešeních

Sure! Here are 10 common questions and answers related to the application of LT1939IDD in technical solutions:

  1. Q: What is LT1939IDD? A: LT1939IDD is a specific model of a power management integrated circuit (PMIC) designed by Linear Technology (now part of Analog Devices). It is commonly used for various power supply applications.

  2. Q: What are the key features of LT1939IDD? A: Some key features of LT1939IDD include high efficiency, low quiescent current, wide input voltage range, adjustable output voltage, and built-in protection features such as overcurrent and thermal shutdown.

  3. Q: What are the typical applications of LT1939IDD? A: LT1939IDD can be used in a wide range of applications, including portable devices, industrial equipment, automotive systems, and other electronic devices that require efficient power management.

  4. Q: How does LT1939IDD achieve high efficiency? A: LT1939IDD achieves high efficiency through its synchronous buck converter architecture, which minimizes power losses and maximizes power transfer from the input to the output.

  5. Q: Can LT1939IDD handle different input voltages? A: Yes, LT1939IDD has a wide input voltage range, typically from 2.7V to 20V, making it suitable for various power supply designs.

  6. Q: Is the output voltage of LT1939IDD adjustable? A: Yes, the output voltage of LT1939IDD can be adjusted using external resistors or feedback components to meet the specific requirements of the application.

  7. Q: Does LT1939IDD provide any protection features? A: Yes, LT1939IDD includes built-in protection features such as overcurrent protection, thermal shutdown, and undervoltage lockout to ensure safe operation and protect the circuitry.

  8. Q: What is the typical efficiency of LT1939IDD? A: The efficiency of LT1939IDD depends on various factors such as input voltage, output current, and load conditions. However, it typically achieves high efficiencies above 90%.

  9. Q: Can LT1939IDD operate in a wide temperature range? A: Yes, LT1939IDD is designed to operate in a wide temperature range, typically from -40°C to 125°C, making it suitable for both industrial and automotive applications.

  10. Q: Are there any evaluation boards or reference designs available for LT1939IDD? A: Yes, Analog Devices provides evaluation boards and reference designs for LT1939IDD, which can help designers quickly prototype and evaluate its performance in specific applications.

Please note that these answers are general and may vary depending on the specific requirements and implementation of LT1939IDD in different technical solutions.