LT3990EDD#PBF

Product Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Regulator
• Characteristics:
  • High efficiency
  • Low dropout voltage
  • Wide input voltage range
  • Adjustable output voltage
• Package: DFN-12
• Essence: Power management IC
• Packaging/Quantity: Tape & Reel, 2500 units per reel

Specifications

• Input Voltage Range: 2.5V to 60V
• Output Voltage Range: 1.22V to 57V
• Output Current: Up to 1.5A
• Dropout Voltage: 300mV at 1A load current
• Quiescent Current: 50µA
• Operating Temperature Range: -40°C to 125°C

Detailed Pin Configuration

The LT3990EDD#PBF has a total of 12 pins. The pin configuration is as follows:

1. VIN: Input voltage pin
2. GND: Ground pin
3. FB: Feedback pin for adjusting the output voltage
4. VOUT: Output voltage pin
5. SW: Switching node connection
6. SS: Soft-start capacitor connection
7. PGND: Power ground pin
8. EN: Enable pin for turning the regulator on/off
9. RT: Timing resistor connection for setting the soft-start time
10. COMP: Compensation pin for stability optimization
11. BST: Boost capacitor connection
12. NC: No connect pin

Functional Features

• High efficiency over a wide input voltage range
• Low dropout voltage allows operation with small voltage differentials
• Adjustable output voltage for flexibility in various applications
• Internal compensation for improved stability
• Soft-start feature for controlled startup
• Thermal shutdown and current limit protection

Advantages and Disadvantages

Advantages: - High efficiency results in reduced power dissipation - Wide input voltage range allows for versatile applications - Adjustable output voltage provides flexibility - Internal compensation simplifies design and improves stability - Soft-start feature prevents excessive inrush current during startup - Protection features enhance reliability

Disadvantages: - Limited output current compared to some other regulators - Requires external components for operation - Higher cost compared to non-integrated solutions

Working Principles

The LT3990EDD#PBF is a voltage regulator that operates by converting an input voltage into a regulated output voltage. It utilizes a switching topology to achieve high efficiency and low dropout voltage. The feedback pin (FB) is used to set the desired output voltage, which can be adjusted within a specified range.

The regulator employs internal compensation to ensure stability and prevent oscillations. It also incorporates a soft-start feature, gradually ramping up the output voltage to avoid excessive inrush current during startup. In case of overtemperature or excessive current, the device includes thermal shutdown and current limit protection mechanisms.

Detailed Application Field Plans

The LT3990EDD#PBF is suitable for various applications that require voltage regulation. Some potential fields of application include:

1. Industrial automation systems
2. Automotive electronics
3. Power management in portable devices
4. Battery-powered equipment
5. Telecommunications infrastructure
6. Distributed power supplies
7. LED lighting systems
8. Solar power systems

Detailed and Complete Alternative Models

1. LT3990IDD#PBF: Similar to LT3990EDD#PBF but available in a 12-lead 3mm x 3mm DFN package.
2. LT3990HDD#PBF: Higher temperature range variant (-40°C to 150°C) of LT3990EDD#PBF.
3. LT3990EMSE#PBF: 12-lead MSOP package alternative with similar specifications.

These alternative models offer similar functionality and characteristics, providing options for different package preferences or specific application requirements.

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