LTC3372IUK#TRPBF

Product Overview

Category: Integrated Circuit (IC)

Use: Power Management

Characteristics: - High efficiency - Low quiescent current - Wide input voltage range - Multiple output channels - Programmable output voltages - Overcurrent protection - Thermal shutdown protection

Package: 20-Lead 4mm x 5mm QFN

Essence: The LTC3372IUK#TRPBF is a power management IC designed for various applications that require multiple regulated voltages. It integrates a high-efficiency buck regulator and three low dropout (LDO) linear regulators, providing flexibility and space-saving benefits.

Packaging/Quantity: The LTC3372IUK#TRPBF is available in a 20-Lead 4mm x 5mm QFN package. The quantity per reel is 2500 units.

Specifications

• Input Voltage Range: 2.25V to 5.5V
• Buck Regulator Output Voltage Range: 0.8V to VIN
• LDO Regulator Output Voltage Range: 0.8V to 3.6V
• Maximum Output Current:
  • Buck Regulator: Up to 1.5A
  • LDO Regulators: Up to 300mA each
• Quiescent Current: 40µA (typical)
• Operating Temperature Range: -40°C to 125°C

Detailed Pin Configuration

The LTC3372IUK#TRPBF has a 20-lead QFN package with the following pin configuration:

1. VIN: Input Voltage
2. SW: Switching Node of Buck Regulator
3. PGND: Power Ground
4. VOUT1: Output Voltage of Buck Regulator
5. VOUT2: Output Voltage of LDO Regulator 1
6. VOUT3: Output Voltage of LDO Regulator 2
7. VOUT4: Output Voltage of LDO Regulator 3
8. EN1: Enable Pin for Buck Regulator
9. EN2: Enable Pin for LDO Regulator 1
10. EN3: Enable Pin for LDO Regulator 2
11. EN4: Enable Pin for LDO Regulator 3
12. FB1: Feedback Pin for Buck Regulator
13. FB2: Feedback Pin for LDO Regulator 1
14. FB3: Feedback Pin for LDO Regulator 2
15. FB4: Feedback Pin for LDO Regulator 3
16. SS: Soft-Start Pin
17. PG: Power Good Indicator
18. GND: Ground
19. VCC: Supply Voltage for Internal Circuitry
20. NC: No Connection

Functional Features

1. Buck Regulator: The integrated buck regulator provides high-efficiency step-down voltage conversion from the input voltage to a programmable output voltage. It offers excellent load and line regulation, making it suitable for various power management applications.

2. LDO Regulators: The LTC3372IUK#TRPBF incorporates three low dropout linear regulators, each capable of providing a regulated output voltage. These LDO regulators are ideal for powering sensitive components that require stable and noise-free voltage levels.

3. Programmable Output Voltages: Both the buck regulator and LDO regulators have programmable output voltages, allowing flexibility in meeting specific system requirements.

4. Overcurrent Protection: The LTC3372IUK#TRPBF features overcurrent protection, which safeguards the IC and connected components from excessive current flow, preventing damage or failure.

5. Thermal Shutdown Protection: To prevent overheating, the IC includes thermal shutdown protection. It shuts down the regulators temporarily if the temperature exceeds a safe threshold, ensuring reliable operation.

Advantages and Disadvantages

Advantages: - High efficiency power conversion - Multiple regulated output voltages - Programmable output voltages for flexibility - Overcurrent and thermal protection for reliability - Space-saving QFN package

Disadvantages: - Limited maximum output current compared to dedicated power management ICs - Requires external components for proper operation

Working Principles

The LTC3372IUK#TRPBF operates based on the principles of switching and linear voltage regulation. The buck regulator utilizes high-frequency switching to step down the input voltage to a lower level, while the LDO regulators use linear voltage regulation to provide stable output voltages.

The IC incorporates control circuitry that monitors the input and output voltages, adjusting the switching frequency and duty cycle to maintain the desired output voltage levels. The programmable feedback pins allow users to set the desired output voltages within the specified range.

In case of excessive current or high temperature, the overcurrent and thermal shutdown