LTC3128EFE

Product Overview

Category: Integrated Circuit (IC)

Use: Power Management

Characteristics: - High Efficiency - Low Quiescent Current - Wide Input Voltage Range - Adjustable Output Voltage - Synchronous Rectification - Internal Compensation - Thermal Shutdown Protection

Package: 20-Lead TSSOP

Essence: The LTC3128EFE is a high-efficiency, synchronous buck-boost DC/DC converter designed for power management applications.

Packaging/Quantity: The LTC3128EFE is available in a 20-Lead Thin Shrink Small Outline Package (TSSOP). It is typically sold in reels of 2500 units.

Specifications

• Input Voltage Range: 2.7V to 15V
• Output Voltage Range: 1.8V to 15V
• Maximum Output Current: 500mA
• Switching Frequency: 1MHz
• Operating Temperature Range: -40°C to 125°C

Pin Configuration

The LTC3128EFE has a total of 20 pins. Here is the detailed pin configuration:

1. VIN: Input Voltage
2. SW: Switch Node Connection
3. PGND: Power Ground
4. AGND: Analog Ground
5. FB: Feedback Voltage Input
6. SS: Soft-Start Capacitor Connection
7. VOUT: Output Voltage
8. EN: Enable Pin
9. RT: Oscillator Timing Resistor
10. CT: Oscillator Timing Capacitor
11. BST: Boost Node Connection
12. LX: Inductor Connection
13. GND: Ground
14. VCC: Supply Voltage
15. SYNC: External Clock Synchronization
16. SS/TRK: Soft-Start/Tracking Control
17. SS/TRK: Soft-Start/Tracking Control
18. SS/TRK: Soft-Start/Tracking Control
19. SS/TRK: Soft-Start/Tracking Control
20. PGND: Power Ground

Functional Features

1. Buck-Boost Operation: The LTC3128EFE can regulate the output voltage even when the input voltage is higher or lower than the desired output voltage.
2. High Efficiency: The synchronous rectification and internal compensation techniques employed in the LTC3128EFE result in high conversion efficiency.
3. Low Quiescent Current: The device has a low quiescent current, which helps conserve power during standby or light load conditions.
4. Thermal Shutdown Protection: The LTC3128EFE incorporates thermal shutdown protection to prevent damage due to excessive temperature.

Advantages and Disadvantages

Advantages: - Wide input voltage range allows for versatile applications. - High efficiency leads to reduced power consumption. - Adjustable output voltage provides flexibility. - Synchronous rectification improves overall efficiency. - Internal compensation simplifies design.

Disadvantages: - Limited maximum output current may not be suitable for high-power applications. - 20-Lead TSSOP package may require careful PCB layout considerations.

Working Principles

The LTC3128EFE utilizes a buck-boost topology to regulate the output voltage. It employs a combination of high-side and low-side switches along with an inductor to efficiently convert the input voltage to the desired output voltage. The device continuously monitors the output voltage and adjusts the duty cycle of the switches to maintain regulation.

Detailed Application Field Plans

The LTC3128EFE is well-suited for various power management applications, including but not limited to: - Battery-powered devices - Portable electronics - Industrial equipment - Automotive systems - Distributed power supplies

Detailed and Complete Alternative Models

Here are some alternative models that offer similar functionality to the LTC3128EFE: - LT8490 - LTC3119 - LT8607

These models can be considered as alternatives based on specific application requirements and design constraints.

In conclusion, the LTC3128EFE is a versatile buck-boost DC/DC converter with high efficiency, low quiescent current, and adjustable output voltage. Its compact package and wide input voltage range make it suitable for various power management applications. However, designers should consider the maximum output current limitation and package considerations when selecting this device.