BQ24257RGER

Product Overview

Category

BQ24257RGER belongs to the category of integrated circuits (ICs) and specifically falls under the power management ICs.

Use

The BQ24257RGER is primarily used for battery charging applications in various electronic devices such as smartphones, tablets, portable media players, and other portable electronic devices.

Characteristics

• The BQ24257RGER is a highly efficient, single-cell Li-ion battery charger with an integrated power path management.
• It supports a wide input voltage range, making it suitable for use with various power sources.
• This IC offers multiple charging modes, including fast charging, trickle charging, and thermal regulation.
• It incorporates advanced safety features like overvoltage protection, overcurrent protection, and thermal shutdown.
• The BQ24257RGER also provides status indication through LED outputs.

Package and Quantity

The BQ24257RGER is available in a small 24-pin VQFN package. It is typically sold in reels or tubes containing a specified quantity, usually around 250 units per reel.

Specifications

• Input Voltage Range: 4.35V to 6.45V
• Charging Voltage Range: 3.5V to 4.44V
• Maximum Charging Current: 2A
• Operating Temperature Range: -40°C to +85°C
• Package Type: VQFN-24

Pin Configuration

The BQ24257RGER has a total of 24 pins. Here is a detailed pin configuration:

1. VIN: Input voltage pin
2. TS: Thermal sense input pin
3. ISET: Charging current setting pin
4. STAT1: Status indication output pin
5. STAT2: Status indication output pin
6. PGND: Power ground pin
7. BAT: Battery connection pin
8. VBUS: USB input voltage pin
9. SYS: System output voltage pin
10. TS/NTC: Thermal sense or NTC input pin
11. ILIM: Input current limit setting pin
12. EN2: Enable 2 pin
13. EN1: Enable 1 pin
14. SDA: I2C data pin
15. SCL: I2C clock pin
16. INT: Interrupt output pin
17. TMR: Timer input pin
18. CE: Charge enable input pin
19. D+/D-: USB data pins
20. GND: Ground pin
21. PG: Power good output pin
22. IINDPM: Input current detection pin
23. VREG: Regulated output voltage pin
24. VBAT: Battery voltage monitoring pin

Functional Features

The BQ24257RGER offers several functional features, including:

1. Integrated power path management allows simultaneous charging and discharging.
2. Dynamic power management optimizes charging efficiency based on the available input power.
3. Automatic battery detection and initialization ensure safe and efficient charging.
4. Programmable charging parameters allow customization for different battery types and applications.
5. Comprehensive protection features safeguard against overvoltage, overcurrent, and overheating.

Advantages and Disadvantages

Advantages

• High charging efficiency and fast charging capability.
• Wide input voltage range enables compatibility with various power sources.
• Integrated power path management allows device operation even during charging.
• Advanced safety features protect the battery and the charging circuitry.
• Programmable charging parameters offer flexibility for different applications.

Disadvantages

• Limited to single-cell Li-ion battery charging applications.
• Requires additional external components for complete functionality.
• Relatively small package size may pose challenges in certain assembly processes.

Working Principles

The BQ24257RGER operates based on a switching regulator architecture. It utilizes a combination of voltage and current regulation techniques to efficiently charge the connected Li-ion battery. The integrated power path management allows the device to prioritize power delivery to the system or the battery, depending on the available input power and load conditions. The IC continuously monitors various parameters like battery voltage, charging current, and temperature to ensure safe and optimal charging.

Detailed Application Field Plans

The BQ24257RGER finds applications in a wide range of portable electronic devices that require single-cell Li-ion battery charging. Some specific application fields include:

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

Alternative Models

For those seeking alternative options, here are some detailed and complete alternative models to consider:

1. MCP73831T-2ACI/OT
2. MAX1555EZK+T
3. LTC4054LES5-4.2#TRMPBF
4. TPS2511DGNR