LTC4120EUD#TRPBF

Product Overview

Category: Integrated Circuit (IC)

Use: Battery Charger

Characteristics: - High efficiency - Wide input voltage range - Programmable charging current - Automatic recharge - Thermal regulation - Overvoltage protection - Undervoltage lockout - Power good status indicator

Package: 16-Lead QFN (Quad Flat No-Lead)

Essence: The LTC4120EUD#TRPBF is a high-efficiency, wide input voltage range battery charger IC. It is designed to charge single-cell lithium-ion/polymer batteries from various power sources such as wall adapters, USB ports, or wireless power receivers.

Packaging/Quantity: The LTC4120EUD#TRPBF is available in a 16-Lead QFN package and is typically sold in reels of 2500 units.

Specifications

• Input Voltage Range: 4V to 19V
• Charging Current Range: 10mA to 400mA
• Charge Termination Voltage: 4.2V ±1%
• Operating Temperature Range: -40°C to 85°C
• Efficiency: Up to 94%

Pin Configuration

The LTC4120EUD#TRPBF has the following pin configuration:

1. VOUT: Output Voltage
2. GND: Ground
3. PROG: Programming Pin
4. EN: Enable Pin
5. PG: Power Good Indicator
6. ISET: Charging Current Set Pin
7. BAT: Battery Connection
8. TS: Thermal Shutdown Pin
9. VIN: Input Voltage
10. N/C: Not Connected
11. N/C: Not Connected
12. N/C: Not Connected
13. N/C: Not Connected
14. N/C: Not Connected
15. N/C: Not Connected
16. N/C: Not Connected

Functional Features

• Programmable charging current allows flexibility in battery charging.
• Automatic recharge feature ensures continuous charging when the battery voltage drops below a certain threshold.
• Thermal regulation prevents overheating of the IC during charging.
• Overvoltage protection safeguards the battery from excessive voltage levels.
• Undervoltage lockout prevents charging when the input voltage is too low.
• Power good status indicator provides visual feedback on the charging status.

Advantages and Disadvantages

Advantages: - High efficiency results in less power loss during charging. - Wide input voltage range allows compatibility with various power sources. - Programmable charging current enables customization based on battery requirements. - Automatic recharge feature ensures uninterrupted charging. - Thermal regulation protects the IC from overheating. - Overvoltage protection and undervoltage lockout enhance safety. - Power good status indicator provides user-friendly feedback.

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

Working Principles

The LTC4120EUD#TRPBF operates as a constant-current/constant-voltage charger. It regulates the charging current based on the programming set by the ISET pin. Once the battery voltage reaches the charge termination voltage, the IC switches to constant-voltage mode, maintaining a steady voltage across the battery terminals.

During charging, the LTC4120EUD#TRPBF monitors the battery temperature through the TS pin. If the temperature exceeds a predefined threshold, the IC reduces the charging current to prevent overheating.

The IC also incorporates overvoltage protection to safeguard the battery from excessive voltage levels. Additionally, it features an undervoltage lockout mechanism that prevents charging when the input voltage is below a certain threshold.

Detailed Application Field Plans

The LTC4120EUD#TRPBF is suitable for a wide range of applications, including: - Portable electronic devices - Wireless charging systems - Battery-powered medical devices - Industrial equipment - IoT devices

Detailed and Complete Alternative Models

Some alternative models to the LTC4120EUD#TRPBF include: - MCP73831: Single-cell Li-ion/polymer battery charger with similar features. - BQ24075: Integrated single-cell Li-ion/polymer battery charger with power path management. - MAX1555: Standalone single-cell Li-ion/polymer battery charger with thermal regulation.

These alternative models offer similar functionality and can be considered based on specific application requirements.

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