LTC4009CUF-1#TRPBF

Product Overview

Category

The LTC4009CUF-1#TRPBF belongs to the category of integrated circuits (ICs) specifically designed for battery charging applications.

Use

This product is primarily used for charging lithium-ion batteries in various electronic devices such as smartphones, tablets, laptops, and portable power banks.

Characteristics

• High efficiency: The LTC4009CUF-1#TRPBF offers high charging efficiency, ensuring optimal use of power during the charging process.
• Fast charging: It supports fast charging protocols, allowing for quicker battery recharge times.
• Safety features: This IC incorporates multiple safety mechanisms to prevent overcharging, overcurrent, and overheating, ensuring safe and reliable battery charging.
• Compact package: The LTC4009CUF-1#TRPBF comes in a small form factor package, making it suitable for space-constrained applications.
• Low standby current: It has a low standby current consumption, minimizing power wastage when not actively charging.

Package and Quantity

The LTC4009CUF-1#TRPBF is available in a compact 24-pin QFN (Quad Flat No-Lead) package. It is typically sold in reels containing a specified quantity of units, usually ranging from a few hundred to several thousand.

Specifications

• Input Voltage Range: 4.5V to 36V
• Charging Current Range: Up to 4A
• Charging Voltage Range: Programmable up to 4.2V per cell
• Efficiency: Up to 95%
• Operating Temperature Range: -40°C to 85°C

Pin Configuration

The LTC4009CUF-1#TRPBF features a 24-pin QFN package with the following pin configuration:

1. VIN: Input voltage
2. GND: Ground
3. VCC: Supply voltage for internal circuitry
4. STAT: Charging status indicator output
5. TS: Temperature sense input
6. ISET: Charging current set pin
7. PROG: Programming pin for charging voltage
8. BAT: Battery connection
9. NTC: Negative temperature coefficient thermistor input
10. TIMER: Timer programming pin
11. SCL: Serial clock input
12. SDA: Serial data input/output
13. INTVCC: Interrupt voltage supply
14. INT: Interrupt output
15. FLT: Fault output
16. PGOOD: Power good output
17. VREF: Reference voltage output
18. VBAT: Battery voltage sense input
19. VOUT: Output voltage
20. SW: Switching node
21. SS: Soft-start capacitor
22. FB: Feedback pin
23. COMP: Compensation pin
24. PGND: Power ground

Functional Features

• Constant current/constant voltage (CC/CV) charging algorithm
• Programmable charging current and voltage levels
• Thermal regulation to prevent overheating
• Automatic recharge feature after battery discharge
• Charge termination based on multiple criteria (voltage, current, time)
• Reverse battery protection
• LED indicators for charging status

Advantages and Disadvantages

Advantages

• High charging efficiency ensures optimal use of power.
• Fast charging capability reduces battery recharge times.
• Multiple safety mechanisms protect against overcharging and overheating.
• Compact package allows for easy integration into space-constrained designs.
• Low standby current minimizes power wastage.

Disadvantages

• Limited to lithium-ion battery charging applications.
• Requires additional external components for complete charging system implementation.

Working Principles

The LTC4009CUF-1#TRPBF operates based on a CC/CV charging algorithm. It starts by delivering a constant current to the battery until the voltage reaches a predefined threshold. At this point, it switches to a constant voltage mode, maintaining the voltage at the specified level while reducing the charging current. Once the charging current drops below a certain threshold or a predetermined time elapses, the charger terminates the charging process.

The IC continuously monitors the battery temperature and adjusts the charging parameters accordingly to prevent overheating. It also incorporates safety features such as reverse battery protection and fault detection to ensure safe and reliable charging.

Application Field Plans

The LTC4009CUF-1#TRPBF finds applications in various electronic devices that utilize lithium-ion batteries. Some potential application fields include: - Smartphones and tablets - Laptops and ultrabooks - Portable power banks - Wearable devices - Electric vehicles (EVs) and hybrid electric vehicles (HEVs)

Alternative Models

For those seeking alternative options, several other ICs can be considered for battery charging applications. Some notable alternatives to the LTC4009CUF-1#TRPBF include: - MAX1555: Integrated single-cell lithium-ion battery charger with thermal regulation.