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BQ24251RGER

Name: BQ24251RGER
Rating: 4.7 (12 reviews)

IC BATT CHG LI-ION 1CELL 24VQFN

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Mfr。パート #BQ24251RGER
パッケージ VQFN (RGE)-24
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仕様

Package	Tape & Reel (TR),Cut Tape (CT)
ProductStatus	Not For New Designs
BatteryChemistry	Lithium Ion
NumberofCells	1
Current-Charging	Constant - Programmable
ProgrammableFeatures	Current
FaultProtection	Over Current, Over Temperature, Over Voltage
ChargeCurrent-Max	2A
BatteryPackVoltage	4.2V
Voltage-Supply(Max)	10.5V
Interface	I²C
OperatingTemperature	-40°C ~ 85°C (TA)
MountingType	Surface Mount
Package/Case	24-VFQFN Exposed Pad

概要

Description

BQ24251RGER is Texas Instruments’ highly integrated charger for single‑cell Li‑ion packs with Power Path management. It is designed for USB‑powered portable devices and provides both battery charging and system power delivery from a single input source (e.g., USB 5V) while the battery is charged.
Key points:
- USB input with system load sharing and autonomous charging control
- Power Path guarantees the system can run from input if available, while charging the battery
- Safety and protection: overvoltage, overcurrent, short‑circuit protection, thermal regulation, and battery temperature monitoring
- Auto recharge and charge termination with minimal external components
- Suitable for smartphones, wearables, cameras, and other portable electronics
RGER is TI’s packaging/reel code for this part. For exact electrical specs (charging current range, input voltage range, timing, protections), consult the BQ24251 datasheet and TI product page.

Features

Here are the main features of the bq24251RGER:
- Single-cell Li‑ion/Li‑polymer battery charger with USB 5V input and power-path management (system power while charging).
- Constant-current/constant-voltage charging with programmable charge current (set by external resistor) and automatic termination.
- Pre‑charge/trickle charge for deeply discharged cells; automatic recharge when voltage drops.
- Battery temperature monitoring (thermistor input) and thermal regulation to protect the pack.
- Safety protections: overvoltage, overcurrent/short-circuit, thermal shutdown/limit, and undervoltage on input.
- Status outputs for charging/fault indication (e.g., CHG/STAT signals) and easy fault/charge monitoring.
- Compact package (RGER) with integrated FETs; suitable for portable devices; no external high-side switch required.
Note: The device is designed for USB-powered single‑cell Li‑ion charging with efficient power-path operation.

Package

BQ24251RGER uses a QFN-16 package (3×3 mm) with an exposed pad (EP).

Pinout

- Pin count: 16 pins (VQFN-16 package).
- Function: Single-cell Li-ion battery charger with integrated system-power-path controller. It accepts USB 5V input, manages battery charging (programmable charge current, termination, safety features), and provides power-path/load sharing to the system with protection.

Manufacturer

Texas Instruments (TI) manufactures the BQ24251RGER. TI is an American multinational technology company that designs and manufactures semiconductors and integrated circuits, specializing in analog and embedded processing solutions.

Application

Applications: USB-powered single-cell Li-Ion battery charger with integrated power-path management for portable devices and IoT.
Typical platforms:
- Smartphones, tablets
- Cameras, wearables
- Handheld scanners, GPS devices
- Portable medical devices
- USB-powered accessories and battery-powered IoT sensors/gateways

Equivalent

Exact one-to-one equivalents don’t exist. Closest cross-references by function (single‑cell Li‑ion charger with power-path):
- TI: BQ24075, BQ24079 (power-path charger family)
- Microchip: MCP73871 (PowerPath), MCP73831/MCP73832 (basic single‑cell chargers)
- Linear/Analog: LTC4054 (1A Li‑ion charger)
- Maxim: MAX1555/MAX1556 (Li‑ion chargers)
Note: pinouts and features differ—check datasheets for compatibility.