L5974D

Product Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Regulator
• Characteristics: High efficiency, low dropout voltage, adjustable output voltage, thermal shutdown, current limiting
• Package: PowerSO-10 package
• Essence: Monolithic step-down switching regulator
• Packaging/Quantity: Available in tape and reel packaging, quantity depends on supplier

Specifications

• Input Voltage Range: 4.5V to 36V
• Output Voltage Range: Adjustable from 1.2V to 35V
• Output Current: Up to 2A
• Switching Frequency: 200kHz
• Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The L5974D has a total of 10 pins:

1. VIN: Input voltage pin
2. GND: Ground pin
3. SENSE: Sense resistor connection for current sensing
4. COMP: Compensation pin for loop stability
5. FB: Feedback pin for adjusting the output voltage
6. VREF: Reference voltage output pin
7. SS/TR: Soft-start/tracking pin for controlling the startup behavior
8. EN: Enable pin for turning the regulator on/off
9. SW: Switching node pin for connecting the inductor
10. PGND: Power ground pin

Functional Features

• High Efficiency: The L5974D offers high efficiency due to its synchronous rectification and low dropout voltage.
• Adjustable Output Voltage: The output voltage can be easily adjusted using an external resistor divider network connected to the FB pin.
• Thermal Shutdown: The IC includes a thermal shutdown feature that protects it from overheating.
• Current Limiting: The L5974D has built-in current limiting to protect the circuit from excessive current.

Advantages and Disadvantages

Advantages: - High efficiency - Adjustable output voltage - Thermal shutdown protection - Current limiting for circuit protection

Disadvantages: - Limited maximum output current (up to 2A) - Requires external components for operation

Working Principles

The L5974D is a monolithic step-down switching regulator. It operates by converting a higher input voltage into a lower output voltage using a power MOSFET switch and an inductor. The IC uses a pulse width modulation (PWM) control scheme to regulate the output voltage. By adjusting the duty cycle of the PWM signal, the desired output voltage can be achieved. The synchronous rectification feature improves efficiency by reducing power losses.

Detailed Application Field Plans

The L5974D is commonly used in various applications that require efficient voltage regulation. Some of the typical application fields include:

1. Power Supplies: The IC can be used in power supply circuits to provide regulated voltages for electronic devices.
2. Battery Chargers: It can be employed in battery charger circuits to ensure proper charging voltage and current.
3. Automotive Electronics: The L5974D is suitable for automotive applications such as powering infotainment systems, lighting, and sensors.
4. Industrial Equipment: It can be utilized in industrial equipment like motor drives, control systems, and instrumentation.

Detailed and Complete Alternative Models

Some alternative models to the L5974D that offer similar functionality are:

1. LM2576: A popular buck converter IC with adjustable output voltage and high efficiency.
2. LT1763: Low dropout linear regulator with adjustable output voltage and low quiescent current.
3. TPS5430: Step-down DC-DC converter with adjustable output voltage and integrated power MOSFETs.

These alternative models can be considered based on specific requirements and design constraints.

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