BQ24251RGER - 2A I2C/Standalone Li-Ion Charger | Texas Instruments
MPN: BQ24251RGER β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.64 | $2.64 |
| 10 | $2.38 | $23.80 |
| 100 | $2.11 | $211.00 |
| 500 | $1.9 | $950.00 |
| 1,000 | $1.69 | $1,690.00 |
Drop-in alternatives for BQ24251RGER β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
BQ24250RGER
β Drop-Inπ Reference alternative (not in catalog)
BQ24251RGET
β Drop-Inπ Reference alternative (not in catalog)
BQ25601RTWR
β Drop-Inβ In Stock
$0.62 / Unit
View Datasheet βBQ24133RGYR
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$3.1 / Unit
View Datasheet βBQ24610RGER
β Drop-Inβ In Stock
$1.85 / Unit
View Datasheet βBQ24251RGER Maximum Ratings & Electrical Characteristics
| Charger Type | Switch-mode (buck) |
| Battery Chemistry | Lithium-Ion |
| Maximum Charge Current | 2 A |
| Charge Voltage Range | 3.5 V to 4.44 V |
| Input Voltage Range | 4.35 V to 10.5 V |
| Input Current Limit Options | 100 mA, 500 mA, 900 mA, 1.5 A, 2 A |
| Interface | I2C |
| Power-Path Management | Yes |
| USB Detection | BC1.2 compatible |
| Quiescent Current | 170 uA |
| Operating Temperature Range | -40C to +85C |
| Package | VQFN-24 (4x4 mm) |
| Mounting Type | Surface Mount |
| Number of Pins | 24 |
| RoHS Status | Compliant |
BQ24251RGER Pin Configuration
| Pin 1 | PMID β Power-path output |
| Pin 2 | VBUS β Input supply from USB/AC |
| Pin 3 | GND β Ground |
| Pin 4 | BAT β Battery connection |
| Pin 5 | SDA β I2C data |
| Pin 6 | SCL β I2C clock |
| Pin 7 | INT β Interrupt output |
| Pin 8 | CE β Charge enable |
| Pin 9 | TS β Temperature sense |
| Pin 10 | ISET β Charge current set |
| Pin 11 | STAT β Charge status output |
| Pin 12 | PG β Power good output |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
BQ24251RGER is suitable for 6 applications: Smartphones, Tablets, Portable Media Players, IoT Devices, Medical Devices, GPS Units.
Smartphones
The BQ24251RGER is ideal for smartphone charging, providing up to 2A charge current and power-path management for instant-on operation. Its I2C interface allows dynamic adjustment of charge parameters, and BC1.2 detection ensures compatibility with USB chargers. The high-efficiency synchronous buck converter minimizes heat, while the power path prioritizes system load, reducing battery stress and enabling fast charging.
Recommended
Tablets
Tablets require higher charge currents and efficient power management. The BQ24251RGER delivers up to 2A, suitable for larger batteries, and its power-path management allows the tablet to operate while charging. The I2C interface enables host-controlled charging profiles, and the wide input voltage range supports various adapters. The compact VQFN-24 package saves board space in slim tablet designs.
Recommended
Portable Media Players
Portable media players benefit from the BQ24251RGER's low quiescent current (170uA) and power-path management, which allows playback while charging. The device's USB detection ensures safe charging from various USB sources, and the standalone mode simplifies design without a host processor. The small package and high efficiency make it ideal for battery-powered audio devices.
Recommended
IoT Devices
IoT devices often run on small batteries and require efficient charging. The BQ24251RGER's low quiescent current and power-path management enable always-on operation, while the I2C interface allows remote monitoring and control. Its wide input voltage range supports energy harvesting and USB power, and the compact package fits space-constrained designs. The device's thermal regulation protects the battery in harsh environments.
Recommended
Medical Devices
Handheld medical devices require reliable, safe charging. The BQ24251RGER's power-path management ensures the device operates even with a depleted battery, critical for patient monitoring. Its thermal regulation and overvoltage protection enhance safety, and the I2C interface allows precise control of charge parameters. The device's small footprint and high efficiency are ideal for portable medical equipment.
Recommended
GPS Units
GPS units need instant-on capability and efficient charging. The BQ24251RGER's power-path management allows the device to start immediately from a deeply discharged battery, ensuring navigation is always available. Its USB detection supports car chargers and USB ports, and the low quiescent current extends battery life. The device's robust protection features make it suitable for outdoor use.
Recommended
Recommended Products Summary
Engineering reference data for BQ24251RGER β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | BQ24250RGER | BQ24251RGET | BQ25601RTWR |
|---|---|---|---|---|
| Package | VQFN-24 (4x4 mm) | VQFN-24 (4x4 mm) | VQFN-24 (4x4 mm) | VQFN-24 (4x4 mm) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Maximum Charge Current | 2 A | 2 A | 2 A | 3 A |
| I2C Interface | Yes | No | Yes | Yes |
| Input Voltage Range | 4.35 V to 10.5 V | 4.35 V to 10.5 V | 4.35 V to 10.5 V | 3.9 V to 14 V |
| Charge Voltage Range | 3.5 V to 4.44 V | 3.5 V to 4.44 V | 3.5 V to 4.44 V | 3.5 V to 4.6 V |
| Quiescent Current | 170 uA | 170 uA | 170 uA | 150 uA |
| Power-Path Management | Yes | Yes | Yes | Yes |
Key Differentiators
- Integrated power-path management (vs BQ24250RGER)
- I2C interface for dynamic control (vs BQ24250RGER)
- BC1.2 USB detection (vs BQ24250RGER)
Design Notes
Place input and output capacitors close to the VBUS and BAT pins to minimize noise and ensure stable operation. Use a 10uF ceramic capacitor on VBUS and a 10uF on BAT, with a 0.1uF bypass capacitor near the IC. Ensure a solid ground plane under the VQFN-24 package to improve thermal performance.
The BQ24251RGER can dissipate significant power during charging, especially at high input voltages. The VQFN-24 package has an exposed thermal pad that must be soldered to a copper pour for adequate heat dissipation. For 2A charging, ensure at least 1 square inch of copper area on the PCB to keep junction temperature within limits.
In host mode, the watchdog timer must be serviced regularly via I2C to prevent the charger from shutting down. Also, ensure the I2C address is correctly configured to avoid conflicts. Do not exceed the absolute maximum input voltage of 10.5V, and verify the charge voltage setting matches the battery specification to prevent overcharging.
Compliance Information
RoHS compliant per JLCPCB listing. Not AEC-Q100 qualified.
