LTC4085EDE-3#TRPBF

Product Overview

Category: Integrated Circuit (IC)

Use: Battery Charger

Characteristics: - High Efficiency - Low Quiescent Current - Wide Input Voltage Range - Programmable Charge Current - Thermal Regulation for Optimal Charging - Automatic Recharge - Reverse Leakage Protection

Package: DFN-10

Essence: The LTC4085EDE-3#TRPBF is a high-efficiency battery charger IC designed for portable devices. It offers a wide input voltage range and programmable charge current, making it suitable for various battery types and sizes.

Packaging/Quantity: The LTC4085EDE-3#TRPBF is available in a DFN-10 package. It is typically sold in reels of 2500 units.

Specifications

• Input Voltage Range: 4V to 18V
• Charge Voltage Range: 2.5V to 14.4V
• Charge Current Range: Up to 1.5A
• Quiescent Current: 35µA
• Operating Temperature Range: -40°C to 85°C

Pin Configuration

The LTC4085EDE-3#TRPBF features the following pin configuration:

1. VIN: Input Voltage
2. GND: Ground
3. PROG: Charge Current Programming Pin
4. STAT: Status Indicator Output
5. TS: Thermal Sense Input
6. BAT: Battery Connection
7. VOUT: Regulated Output Voltage
8. ISET: Charge Current Setting Pin
9. CE: Enable Pin
10. FLT: Fault Indicator Output

Functional Features

• High Efficiency: The LTC4085EDE-3#TRPBF utilizes advanced charging algorithms to maximize charging efficiency, reducing power loss.
• Low Quiescent Current: With a quiescent current of only 35µA, the IC minimizes power consumption when not actively charging.
• Wide Input Voltage Range: The IC can accept input voltages ranging from 4V to 18V, allowing it to be used with various power sources.
• Programmable Charge Current: The charge current can be programmed using an external resistor, providing flexibility for different battery sizes and types.
• Thermal Regulation for Optimal Charging: The IC incorporates thermal regulation to adjust the charge current based on the temperature, ensuring safe and efficient charging.
• Automatic Recharge: When the battery voltage drops below a certain threshold, the IC automatically initiates recharge to maintain optimal battery performance.
• Reverse Leakage Protection: The LTC4085EDE-3#TRPBF includes reverse leakage protection to prevent current flow from the battery back into the charger.

Advantages and Disadvantages

Advantages: - High efficiency charging - Wide input voltage range - Programmable charge current - Thermal regulation for safe charging - Automatic recharge feature - Reverse leakage protection

Disadvantages: - Limited availability in alternative packages - Requires external components for complete charging circuit

Working Principles

The LTC4085EDE-3#TRPBF operates as a switch-mode battery charger. It uses a combination of constant current and constant voltage charging techniques to efficiently charge batteries. The charge current is programmable through an external resistor connected to the ISET pin. The IC monitors the battery voltage and adjusts the charge current accordingly to maintain a constant voltage during the final stage of charging.

Thermal regulation ensures that the charge current is adjusted based on the temperature to prevent overheating and ensure safe charging. The IC also features automatic recharge functionality, which initiates charging when the battery voltage falls below a certain threshold.

Detailed Application Field Plans

The LTC4085EDE-3#TRPBF is widely used in various portable devices that require battery charging capabilities. Some of the common application fields include:

1. Smartphones and Tablets: The IC can be integrated into smartphones and tablets to provide efficient and safe charging for their built-in batteries.
2. Portable Medical Devices: It is suitable for medical devices such as portable monitors, insulin pumps, and handheld diagnostic tools that rely on rechargeable batteries.
3. Wearable Electronics: The IC can be utilized in wearable devices like smartwatches, fitness trackers, and wireless earbuds to enable convenient and reliable charging.
4. Portable Audio Devices: It is commonly used in portable speakers, headphones, and music players to ensure optimal battery charging performance.

Detailed and Complete Alternative Models

Some alternative models that offer similar functionality to the LTC4085EDE-3#TRPBF include:

1. MCP73831: A compact, standalone linear Li-Ion/Li-Polymer charge management controller.
2. BQ24075: A highly integrated single-cell Li-Ion battery charger with thermal regulation and USB