LTC4121IUD-4.2

Product Overview

Category

The LTC4121IUD-4.2 belongs to the category of integrated circuits (ICs) specifically designed for wireless power transfer applications.

Use

This IC is primarily used for wireless charging applications, enabling efficient and convenient power transfer between a transmitter and receiver in various electronic devices.

Characteristics

• High efficiency: The LTC4121IUD-4.2 offers high power conversion efficiency, minimizing energy loss during wireless charging.
• Wide input voltage range: It can operate with input voltages ranging from 4.5V to 19V, providing flexibility in different charging scenarios.
• Adjustable output voltage: The output voltage can be adjusted to 4.2V, suitable for charging lithium-ion batteries commonly found in portable electronic devices.
• Compact package: The LTC4121IUD-4.2 is available in a small and space-saving 16-pin QFN package.

Package and Quantity

The LTC4121IUD-4.2 is packaged in a 16-pin QFN (Quad Flat No-Lead) package. It is typically sold in reels or trays, with a quantity of 250 units per reel/tray.

Specifications

• Input Voltage Range: 4.5V - 19V
• Output Voltage: 4.2V (adjustable)
• Maximum Charging Current: 400mA
• Operating Temperature Range: -40°C to 85°C
• Package Type: 16-pin QFN

Pin Configuration

The LTC4121IUD-4.2 features the following pin configuration:

Pin 1: VOUT Pin 2: GND Pin 3: EN Pin 4: VIN Pin 5: ISET Pin 6: VFB Pin 7: VCC Pin 8: VCC Pin 9: VCC Pin 10: VCC Pin 11: VCC Pin 12: VCC Pin 13: VCC Pin 14: VCC Pin 15: VCC Pin 16: VCC

Functional Features

• Automatic Power Control: The LTC4121IUD-4.2 incorporates an automatic power control mechanism, adjusting the charging current based on the receiver's demand and battery condition.
• Foreign Object Detection: It includes a built-in feature to detect foreign objects on the charging pad, ensuring safe and efficient charging by preventing energy transfer to non-compatible devices.
• Thermal Regulation: The IC monitors its own temperature and adjusts the charging current accordingly to prevent overheating and ensure reliable operation.

Advantages and Disadvantages

Advantages

• High efficiency leads to reduced energy loss during wireless charging.
• Wide input voltage range allows compatibility with various power sources.
• Adjustable output voltage suits different lithium-ion battery charging requirements.
• Compact package enables integration into space-constrained designs.

Disadvantages

• Limited maximum charging current of 400mA may not be suitable for high-power devices.
• Requires additional external components for a complete wireless charging system implementation.

Working Principles

The LTC4121IUD-4.2 operates based on the principles of resonant inductive coupling. It utilizes a transmitter coil and a receiver coil to establish a magnetic field between them. When the receiver coil is placed near the transmitter coil, the magnetic field induces an alternating current (AC) in the receiver coil. This AC current is rectified and regulated by the LTC4121IUD-4.2 to provide a stable DC output voltage for charging the connected lithium-ion battery.

Application Field Plans

The LTC4121IUD-4.2 finds applications in various wireless charging scenarios, including but not limited to: - Mobile phones and smartphones - Tablets and portable electronic devices - Wearable devices (smartwatches, fitness trackers) - Wireless charging pads and stations

Alternative Models

For wireless charging applications, there are several alternative models available in the market that offer similar functionality to the LTC4121IUD-4.2. Some notable alternatives include: - TI BQ500212A - Maxim MAX77958 - NXP NXQ1TXH5

These alternative models provide comparable features and can be considered as substitutes depending on specific design requirements.

In conclusion, the LTC4121IUD-4.2 is an integrated circuit designed for wireless power transfer applications. With its high efficiency, wide input voltage range, and adjustable output voltage, it offers a reliable and flexible solution for wireless charging of lithium-ion batteries in various electronic devices.