LTC4070IDDB#TRPBF

Product Overview

Category: Integrated Circuit (IC)

Use: Battery Charger

Characteristics: - High Efficiency - Low Quiescent Current - Small Package Size - Wide Input Voltage Range

Package: DFN-8

Essence: The LTC4070IDDB#TRPBF is a battery charger IC designed for charging single-cell lithium-ion/polymer batteries. It offers high efficiency and low quiescent current, making it suitable for various portable electronic devices.

Packaging/Quantity: The LTC4070IDDB#TRPBF is available in a DFN-8 package and is typically sold in reels of 2500 units.

Specifications

• Input Voltage Range: 4.35V to 6V
• Charge Current: Up to 800mA
• Charge Termination: Programmable
• Preconditioning: Yes
• Battery Temperature Monitoring: Yes
• Reverse Battery Protection: Yes
• Thermal Shutdown: Yes

Pin Configuration

The LTC4070IDDB#TRPBF has the following pin configuration:

1. VIN - Input Voltage
2. GND - Ground
3. PROG - Charge Termination Programming
4. STAT - Status Indicator Output
5. BAT - Battery Connection
6. TS - Battery Temperature Sense
7. VOUT - Regulated Output Voltage
8. ISET - Charge Current Programming

Functional Features

1. High Efficiency: The LTC4070IDDB#TRPBF utilizes a synchronous buck topology to achieve high charging efficiency, minimizing power loss during the charging process.

2. Low Quiescent Current: In standby mode, the LTC4070IDDB#TRPBF consumes very low quiescent current, ensuring minimal drain on the battery when not in use.

3. Programmable Charge Termination: The charge termination voltage can be programmed using an external resistor, allowing flexibility in setting the desired charging level.

4. Preconditioning: The LTC4070IDDB#TRPBF incorporates a preconditioning feature that allows charging deeply discharged batteries without causing damage or excessive heating.

5. Battery Temperature Monitoring: The IC includes a temperature sense pin for monitoring the battery temperature during charging, ensuring safe operation and preventing overheating.

6. Reverse Battery Protection: The LTC4070IDDB#TRPBF provides reverse battery protection, safeguarding the charger and the connected device from potential damage caused by reverse polarity.

7. Thermal Shutdown: To prevent overheating, the IC is equipped with a thermal shutdown feature that automatically disables the charging process if the temperature exceeds a certain threshold.

Advantages

• High charging efficiency
• Low quiescent current consumption
• Programmable charge termination voltage
• Preconditioning capability for deeply discharged batteries
• Battery temperature monitoring for safe operation
• Reverse battery protection
• Thermal shutdown for overheat protection

Disadvantages

• Limited to single-cell lithium-ion/polymer battery charging
• Not suitable for multi-cell battery packs

Working Principles

The LTC4070IDDB#TRPBF operates based on a synchronous buck topology. It converts the input voltage into a regulated output voltage suitable for charging single-cell lithium-ion/polymer batteries. The charge current and termination voltage can be programmed externally to meet specific requirements. The IC also includes various safety features such as battery temperature monitoring, reverse battery protection, and thermal shutdown.

Application Field Plans

The LTC4070IDDB#TRPBF is commonly used in portable electronic devices that require single-cell lithium-ion/polymer battery charging. Some typical application fields include:

1. Smartphones and tablets
2. Portable media players
3. Bluetooth headsets
4. Wearable devices
5. GPS navigation systems
6. Portable gaming consoles

Alternative Models

1. MCP73831: Single-cell Li-Ion/Li-Polymer Charge Management Controller
2. MAX1555: Stand-Alone Linear Li+ Battery Charger
3. BQ24075: Single-Input, Single-Cell Li-Ion Battery Charger
4. LT3652: 2A, 18V Input, 55V Buck-Boost Battery Charger

These alternative models offer similar functionality and can be considered as alternatives to the LTC4070IDDB#TRPBF depending on specific requirements.

In conclusion, the LTC4070IDDB#TRPBF is a highly efficient battery charger IC designed for single-cell lithium-ion/polymer batteries. It offers programmable charge termination, low quiescent current, and various safety features. Its small package size and wide input voltage range make it suitable for a range of portable electronic devices. However, it is important to note that it is not suitable for multi-cell battery packs.