LTC4121IUD

Product Overview

Category: Integrated Circuit (IC)

Use: The LTC4121IUD is a versatile integrated circuit designed for wireless power transfer applications. It enables efficient charging of batteries or supercapacitors in various electronic devices wirelessly.

Characteristics: - High efficiency power transfer - Wide input voltage range - Programmable output voltage and current - Fault protection features - Compact and lightweight design

Package: The LTC4121IUD is available in a small 16-pin QFN package, which ensures easy integration into space-constrained designs.

Essence: The essence of the LTC4121IUD lies in its ability to provide wireless power transfer capabilities, eliminating the need for physical connectors and enabling convenient charging of portable devices.

Packaging/Quantity: The LTC4121IUD is typically sold in reels containing 250 units per reel.

Specifications

The LTC4121IUD offers the following specifications:

• Input Voltage Range: 2.7V to 5.5V
• Output Voltage Range: 2.5V to 5.25V
• Maximum Output Current: 400mA
• Operating Frequency: 6.78MHz
• Efficiency: Up to 80%
• Standby Current: 50µA

Pin Configuration

The LTC4121IUD features a detailed pin configuration as follows:

1. VIN - Input Voltage
2. GND - Ground
3. VOUT - Output Voltage
4. PGND - Power Ground
5. EN - Enable Pin
6. FREQ - Frequency Setting
7. ISET - Output Current Setting
8. BAT - Battery Connection
9. CIN - Input Capacitor
10. COUT - Output Capacitor
11. L - Inductor Connection
12. SW - Switching Node
13. FB - Feedback Pin
14. SS - Soft-Start Pin
15. INTVCC - Internal Voltage Regulator
16. NC - No Connection

Functional Features

The LTC4121IUD offers the following functional features:

1. High Efficiency Power Transfer: The IC ensures efficient power transfer from the transmitter to the receiver, minimizing energy losses during wireless charging.

2. Wide Input Voltage Range: The LTC4121IUD can operate with input voltages ranging from 2.7V to 5.5V, making it compatible with a wide range of power sources.

3. Programmable Output Voltage and Current: Users can easily program the desired output voltage and current levels using the ISET pin, providing flexibility for different charging requirements.

4. Fault Protection Features: The IC incorporates various fault protection mechanisms such as overvoltage protection, undervoltage lockout, and thermal shutdown, ensuring safe and reliable operation.

Advantages and Disadvantages

Advantages: - Enables wireless charging, eliminating the need for physical connectors - Compact and lightweight design allows for easy integration into portable devices - Wide input voltage range provides compatibility with various power sources - Programmable output voltage and current offer flexibility for different charging needs - Fault protection features ensure safe and reliable operation

Disadvantages: - Limited maximum output current (400mA) may not be suitable for high-power devices - Higher cost compared to traditional wired charging solutions

Working Principles

The LTC4121IUD operates based on the principles of resonant inductive coupling. It utilizes a transmitter coil to generate an oscillating magnetic field, which induces a voltage in the receiver coil. This voltage is rectified and regulated to provide a stable output voltage for charging batteries or supercapacitors.

The IC employs a closed-loop control system to maintain efficient power transfer by continuously adjusting the operating frequency and duty cycle. This ensures maximum power transfer while minimizing energy losses.

Application Field Plans

The LTC4121IUD finds applications in various fields, including:

1. Consumer Electronics: Wireless charging of smartphones, tablets, smartwatches, and other portable devices.
2. Medical Devices: Charging of wireless medical implants, such as pacemakers and hearing aids.
3. Internet of Things (IoT): Powering IoT devices wirelessly, eliminating the need for frequent battery replacements.
4. Automotive: Integration into electric vehicles for wireless charging of batteries.

Alternative Models

For those seeking alternative options, the following models provide similar functionality to the LTC4121IUD:

1. Texas Instruments BQ51013B
2. Maxim Integrated MAX20340
3. STMicroelectronics STWLC03

These models offer comparable features and can be considered as alternatives based on specific application requirements.

In conclusion, the LTC4121IUD is a versatile integrated circuit designed for wireless power transfer applications. Its compact design, programmable features, and fault protection mechanisms make it an ideal choice for various electronic devices requiring wireless charging capabilities.