LTC4071IMS8E#PBF

Product Overview

Category: Integrated Circuit (IC)

Use: Battery Charger

Characteristics: - Small form factor - High efficiency - Low quiescent current - Wide input voltage range - Programmable charge current - Thermal regulation for safe charging

Package: MSOP-8

Essence: The LTC4071IMS8E#PBF is a battery charger IC designed to efficiently charge single-cell lithium-ion/polymer batteries. It offers a compact solution with programmable charge current and thermal regulation, ensuring safe and efficient charging.

Packaging/Quantity: The LTC4071IMS8E#PBF is available in an MSOP-8 package. It is typically sold in reels of 2500 units.

Specifications

• Input Voltage Range: 4.35V to 6V
• Charge Current Range: 10mA to 950mA
• Quiescent Current: 55µA
• Charge Termination: C/10 or Timer
• Thermal Regulation Threshold: 100°C
• Operating Temperature Range: -40°C to 85°C

Pin Configuration

The LTC4071IMS8E#PBF has the following pin configuration:

```

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| | --| VIN GND |-- Pin 1 --| VOUT BAT |-- Pin 2 --| PROG STAT |-- Pin 3 --| FLT TS |-- Pin 4 |___________| ```

1. VIN: Input voltage pin.
2. VOUT: Output voltage pin.
3. PROG: Charge current programming pin.
4. FLT: Fault indicator pin.
5. STAT: Status output pin.
6. BAT: Battery connection pin.
7. GND: Ground pin.
8. TS: Thermal shutdown pin.

Functional Features

1. Programmable Charge Current: The PROG pin allows the charge current to be programmed according to the battery's requirements.
2. Thermal Regulation: The LTC4071IMS8E#PBF features thermal regulation, which reduces the charge current when the IC temperature exceeds a certain threshold, preventing overheating and ensuring safe charging.
3. Fault Indicator: The FLT pin provides an indication of any fault conditions during charging, such as overvoltage or overtemperature.
4. Status Output: The STAT pin provides information about the charging status, indicating whether the battery is charging, fully charged, or in a fault condition.

Advantages and Disadvantages

Advantages: - Small form factor enables compact designs. - High efficiency results in faster charging times. - Wide input voltage range allows for versatile applications. - Programmable charge current accommodates different battery capacities. - Thermal regulation ensures safe charging even under high ambient temperatures.

Disadvantages: - Limited to single-cell lithium-ion/polymer batteries. - Requires external components for complete charging circuitry.

Working Principles

The LTC4071IMS8E#PBF operates as a constant-current/constant-voltage (CC/CV) charger for single-cell lithium-ion/polymer batteries. It uses a programmable charge current to deliver a controlled amount of current to the battery during the initial charging phase. Once the battery voltage reaches the programmed float voltage, the charger switches to a constant-voltage mode, maintaining the battery voltage at the desired level while reducing the charge current.

Thermal regulation is employed to prevent excessive heating during charging. If the IC temperature exceeds the thermal regulation threshold, the charge current is reduced to protect the battery and the charger itself.

Detailed Application Field Plans

The LTC4071IMS8E#PBF is suitable for various portable electronic devices powered by single-cell lithium-ion/polymer batteries. Some potential application fields include:

1. Smartphones and Tablets: The LTC4071IMS8E#PBF can be used in the charging circuitry of smartphones and tablets, ensuring efficient and safe battery charging.

2. Wearable Devices: It is suitable for wearable devices such as smartwatches and fitness trackers, providing a compact and reliable charging solution.

3. Portable Medical Devices: The IC can be utilized in portable medical devices like blood glucose monitors or portable oxygen concentrators, enabling convenient and optimized battery charging.

4. IoT Devices: The LTC4071IMS8E#PBF can be integrated into IoT devices such as wireless sensors or smart home devices, ensuring reliable power management.

Detailed and Complete Alternative Models

1. MCP73831: This IC from Microchip offers similar functionality and features as the LTC4071IMS8E#PBF. It is available in various package options and supports single-cell lithium-ion/polymer battery charging.

2. BQ24075: Texas Instruments' BQ24075 is another alternative with comparable specifications. It provides a complete charging solution for single-cell lithium-ion