LT1940LEFE#TRPBF

Product Overview

• Category: Integrated Circuit (IC)
• Use: Power Management
• Characteristics: High efficiency, low quiescent current, compact size
• Package: 16-Lead TSSOP
• Essence: Voltage Regulator
• Packaging/Quantity: Tape & Reel, 2500 units per reel

Specifications

• Input Voltage Range: 2.5V to 36V
• Output Voltage Range: 1.22V to 34V
• Maximum Output Current: 1.5A
• Quiescent Current: 85µA
• Switching Frequency: 500kHz
• Operating Temperature Range: -40°C to 125°C

Detailed Pin Configuration

The LT1940LEFE#TRPBF IC has a 16-Lead TSSOP package with the following pin configuration:

1. VIN: Input voltage
2. GND: Ground
3. SW: Switch node connection
4. FB: Feedback pin for output voltage regulation
5. SS: Soft-start capacitor connection
6. VCC: Supply voltage for internal circuitry
7. PGND: Power ground
8. SYNC: Synchronization input
9. RT: Timing resistor connection for switching frequency control
10. COMP: Compensation pin for loop stability
11. BST: Bootstrap capacitor connection
12. LX: Inductor connection
13. EN: Enable pin for turning on/off the regulator
14. VOUT: Output voltage
15. VREF: Reference voltage output
16. AGND: Analog ground

Functional Features

• High efficiency synchronous step-down DC/DC converter
• Low quiescent current for improved power efficiency
• Wide input voltage range suitable for various applications
• Adjustable output voltage for flexibility
• Internal compensation for simplified design
• Soft-start feature for controlled startup
• Synchronization capability for noise-sensitive applications

Advantages and Disadvantages

Advantages: - High efficiency leads to reduced power consumption - Compact size allows for space-saving designs - Wide input voltage range enables versatile applications - Adjustable output voltage provides flexibility - Internal compensation simplifies circuit design

Disadvantages: - Limited maximum output current of 1.5A - Requires external components for operation - Higher cost compared to non-integrated solutions

Working Principles

The LT1940LEFE#TRPBF is a synchronous step-down DC/DC converter that efficiently converts a higher input voltage to a lower output voltage. It utilizes a switching regulator topology to achieve high efficiency by minimizing power losses. The IC incorporates internal MOSFETs, which eliminate the need for external power switches.

The device operates by controlling the duty cycle of the internal switches based on the feedback received from the FB pin. This feedback loop ensures that the output voltage remains stable and within the desired range. The LT1940LEFE#TRPBF also includes various protection features such as overvoltage, overcurrent, and thermal shutdown.

Detailed Application Field Plans

The LT1940LEFE#TRPBF is suitable for a wide range of 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 control systems, sensors, and actuators.
3. Automotive electronics: Supports voltage regulation in automotive infotainment systems, lighting modules, and navigation devices.
4. Communication systems: Facilitates power management in routers, modems, and wireless access points.
5. LED lighting: Offers efficient voltage conversion for LED drivers used in lighting applications.

Detailed and Complete Alternative Models

1. LT8610ABEUJ#PBF: Synchronous step-down DC/DC converter with higher maximum output current of 3A.
2. LT1763CS8-1.5#PBF: Low dropout voltage regulator with fixed output voltage of 1.5V.
3. LT3080EST#PBF: Adjustable linear regulator with high output current capability of up to 1.1A.

These alternative models provide similar functionality and can be considered based on specific application requirements.

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