LTC4121IUD-4.2#TRPBF

Product Overview

Category

The LTC4121IUD-4.2#TRPBF belongs to the category of integrated circuits (ICs) and specifically falls under the power management ICs.

Use

This product is primarily used for wireless power transfer applications, enabling efficient charging of batteries in various devices wirelessly.

Characteristics

• The LTC4121IUD-4.2#TRPBF is a high-performance wireless power receiver IC.
• It operates at a fixed frequency of 6.78 MHz, complying with the Wireless Power Consortium (WPC) Qi standard.
• This IC provides a regulated output voltage of 4.2V, suitable for charging lithium-ion batteries.
• It incorporates advanced features such as foreign object detection (FOD) and thermal regulation for safe and reliable charging.

Package

The LTC4121IUD-4.2#TRPBF comes in a small and compact 16-pin QFN (Quad Flat No-Lead) package, which ensures ease of integration into various electronic devices.

Essence

The essence of the LTC4121IUD-4.2#TRPBF lies in its ability to efficiently transfer power wirelessly, simplifying the charging process for battery-powered devices.

Packaging/Quantity

This product is typically available in tape and reel packaging, with a quantity of 2500 units per reel.

Specifications

• Input Voltage Range: 4.95V to 5.5V
• Output Voltage: 4.2V ±1%
• Maximum Output Current: 400mA
• Operating Frequency: 6.78MHz
• Efficiency: Up to 80%
• Standby Current: <1µA
• Operating Temperature Range: -40°C to 85°C

Detailed Pin Configuration

The LTC4121IUD-4.2#TRPBF features a 16-pin QFN package with the following pin configuration:

1. VIN: Input voltage
2. GND: Ground
3. VOUT: Regulated output voltage
4. PGND: Power ground
5. FOD: Foreign object detection
6. TS: Thermal sense
7. BAT: Battery connection
8. NTC: Negative temperature coefficient input
9. VCC: Internal supply voltage
10. INTVCC: Internal voltage regulator output
11. SDA: I²C serial data input/output
12. SCL: I²C serial clock input
13. IRQ: Interrupt request output
14. EN: Enable control input
15. NC: No connect
16. NC: No connect

Functional Features

The LTC4121IUD-4.2#TRPBF offers several functional features, including:

1. Wireless Power Transfer: Enables efficient wireless charging of batteries.
2. Foreign Object Detection (FOD): Ensures safe operation by detecting foreign objects on the charging pad.
3. Thermal Regulation: Monitors and regulates the temperature during charging to prevent overheating.
4. I²C Interface: Allows for communication with external devices for advanced control and monitoring capabilities.
5. Low Standby Current: Minimizes power consumption when not actively charging.

Advantages and Disadvantages

Advantages

• High-performance wireless power receiver IC.
• Complies with the WPC Qi standard.
• Efficient power transfer and charging.
• Incorporates safety features like FOD and thermal regulation.
• Compact package for easy integration.

Disadvantages

• Limited maximum output current of 400mA.
• Requires an external I²C interface for advanced control.

Working Principles

The LTC4121IUD-4.2#TRPBF operates based on the principles of resonant inductive coupling. It receives power wirelessly from a compatible transmitter pad through magnetic fields. The received power is then rectified, regulated, and used to charge the connected lithium-ion battery.

The IC incorporates FOD to detect any foreign objects on the charging pad, preventing unsafe charging conditions. Additionally, thermal regulation ensures that the temperature remains within safe limits during the charging process.

Detailed Application Field Plans

The LTC4121IUD-4.2#TRPBF finds applications in various wireless charging scenarios, including:

1. Mobile Devices: Smartphones, tablets, and smartwatches.
2. Wearable Electronics: Fitness trackers, wireless earbuds, and smart glasses.
3. Internet of Things (IoT) Devices: Wireless sensors, smart home devices, and medical wearables.
4. Automotive: Electric vehicle charging pads and wireless charging systems for electric vehicles.
5. Industrial Applications: Wireless charging for industrial equipment and machinery.

Detailed and Complete Alternative Models

1. LTC4120IUFD-4.2#TRPBF: Similar wireless power receiver IC with a fixed output voltage of