LTC4121IUD#PBF

Product Overview

Category

The LTC4121IUD#PBF belongs to the category of integrated circuits (ICs) used in power management.

Use

This IC is specifically designed for wireless power transfer applications, enabling efficient charging of batteries in various electronic devices.

Characteristics

• High efficiency: The LTC4121IUD#PBF offers high efficiency power conversion, minimizing energy loss during wireless charging.
• Compact package: It comes in a small and convenient 16-lead QFN package, allowing for easy integration into compact electronic devices.
• Versatile compatibility: This IC supports a wide range of battery chemistries, making it suitable for diverse applications.
• Robust protection features: It incorporates various protection mechanisms such as overvoltage, overcurrent, and thermal shutdown, ensuring safe operation.

Package and Quantity

The LTC4121IUD#PBF is available in a 16-lead QFN package. It is typically sold in reels containing a quantity of 250 units.

Specifications

• Input Voltage Range: 4V - 19V
• Output Voltage Range: 2.5V - 10V
• Maximum Charging Current: 400mA
• Operating Temperature Range: -40°C to 85°C
• Efficiency: Up to 90%
• Quiescent Current: 50µA

Pin Configuration

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

1. VIN: Input voltage pin
2. GND: Ground pin
3. VOUT: Output voltage pin
4. BAT: Battery connection pin
5. NTC: Negative temperature coefficient pin
6. PROG: Programming pin
7. FREQ: Frequency selection pin
8. SS: Soft-start pin
9. FLT: Fault indicator pin
10. PGND: Power ground pin
11. VCC: Supply voltage pin
12. INTVCC: Internal supply voltage pin
13. LX: Inductor connection pin
14. BST: Boost capacitor connection pin
15. FB: Feedback pin
16. EN: Enable pin

Functional Features

• Wireless power transfer: The LTC4121IUD#PBF facilitates wireless charging by converting the received RF energy into a regulated DC output voltage.
• Automatic start-up: It automatically starts charging when an appropriate RF signal is detected, eliminating the need for manual intervention.
• Programmable charging parameters: The PROG pin allows users to adjust various charging parameters such as current limit and termination voltage, providing flexibility for different battery chemistries.
• Fault detection and indication: The FLT pin provides a fault indication signal in case of abnormal conditions such as overvoltage or overcurrent.

Advantages and Disadvantages

Advantages

• High efficiency power conversion reduces energy loss during wireless charging.
• Compact package enables easy integration into small electronic devices.
• Versatile compatibility with various battery chemistries enhances its applicability.
• Robust protection features ensure safe operation.

Disadvantages

• Limited maximum charging current (400mA) may not be suitable for high-capacity batteries.
• Requires an external RF energy source for wireless charging, which may not be readily available in all environments.

Working Principles

The LTC4121IUD#PBF operates based on the principles of resonant inductive coupling. When an RF signal is received through the antenna, it is rectified and regulated to provide a stable DC output voltage. This voltage is then used to charge the connected battery. The IC continuously monitors the charging process and adjusts the charging parameters accordingly to ensure efficient and safe charging.

Application Field Plans

The LTC4121IUD#PBF finds applications in various wireless charging scenarios, including but not limited to: - Mobile devices such as smartphones and tablets - Wearable electronics like smartwatches and fitness trackers - Portable medical devices - Internet of Things (IoT) devices - Automotive electronics

Alternative Models

For those seeking alternative options, the following models provide similar functionality to the LTC4121IUD#PBF: - LTC4120IUFD#PBF - LTC4125IUFD#PBF - LTC4126IUFD#PBF

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

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