Support software
BQ24257
2A Single Input I2C/Standalone Switch-Mode Li-Ion Battery Charger
Data sheet
Although this product continues to be in production to support previous designs, we don't recommend it for new designs. Consider one of these alternates:
Similar functionality to the compared device
BQ24257
- High-efficiency Switch-mode Charger with Integrated Current Sense Resistor
- BC1.2 D+, D– Detection with Dead Battery Provision (DBP) Pin-to-Sync with External USB-PHI
- USB Charging Compliant
- Selectable Input Current Limit of 100 mA,
150 mA, 500 mA, 900 mA. 1.5 A, and 2 A - Watchdog Timer with Disable Bit
- Integrated 4.9-V, 50-mA LDO
- Complete System Level Protection
- Input UVLO, Input Overvoltage Protection (OVP), Battery OVP, Sleep Mode, VIN_DPM
- Input Current Limit
- Charge Current Limit
- Thermal Regulation and Thermal Shutdown
- Voltage Based, JEITA Compatible NTC Monitoring Input
- Safety Timer
- In Host Mode, Programmable VBATREG, ICHG, ILIM, VIN_DPM, VOVP and safety timer in host mode (after I2C Communication and Before Watchdog Timer Times Out)
- In Standalone Mode, Resistor Programmable ICHG, ILIM, and VIN_DPM in Standalone Mode (before I2C Communication and After Watchdog Timer Times Out)
- 20-V Maximum Input Voltage Rating
- 10.5-V Maximum Operating Input Voltage
- Low RDS(on) Integrated Sense Resistor for up to 2-A Charging Rate
- Open Drain Status Outputs
- Synchronous Fixed-frequency PWM Controller Operating at 3 MHz for Small Inductor Support
- Robust Battery Detection Algorithm
- Charge Time Optimizer for Improved Charge Times at any Given Charge Current
The bq2425x is a highly integrated single-cell Li-Ion battery charger with integrated current sense resistor targeted for space-limited, portable applications with high capacity batteries. The single cell charger has a single input that operates from either a USB port or AC wall adapter for a versatile solution. BC1.2 compatible D+, D- detection allows for recognition of CDP, DCP, SDP, and non-standard USB adapters. The use of an accessory dead battery provision (DBP) pin allows for the system to sync a dead battery state in order to enable or disable the BC1.2 detection in the event of an external USB-PHI.
The bq24257 has two modes of operation: 1) I2C mode, and 2) Standalone mode. In I2C mode, the host can adjust the charge parameters and monitor the status of the charger operation. In Standalone mode, the external resistor sets the input current limit, charge current limit, and the input DPM level. This mode also serves as the default settings when a DCP adapter is present. The bq24257 enters host mode while the I2C registers are accessed and the watchdog timer has not expired (if enabled).
For all available packages, see the orderable addendum at the end of the datasheet.All trademarks are the property of their respective owners.
The bq24258 has only one mode of operation which is the Standalone. In this mode, the external resistor sets the input current limit, charge current limit, and the input DPM level. This mode also serves as the default settings when a DCP adapter is present. The EN1, EN2, and EN3 pin are available in the bq24258 spin to support USB 3.0 compliance.
The battery is charged in four phases: trickle charge, pre-charge, constant current and constant voltage. In all charge phases, an internal control loop monitors the device junction temperature and reduces the charge current if the internal temperature threshold is exceeded. Additionally, a voltage-based, JEITA compatible battery pack thermistor monitoring input (TS) is included that monitors battery temperature for safe charging.
Technical documentation
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View all 6 | Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | bq24257, bq24258 2-A Single Input I2C, Standalone Switch-Mode Li-Ion/LiFePO4 Battery Charger with Integrated Current-Sense Resistor datasheet (Rev. C) | PDF | HTML | 30 Aug 2013 |
| Analog Design Journal | Battery-charging considerations for high-power portable devices | 11 Apr 2014 | ||
| Application note | Building your own Battery Simulator | 14 Oct 2013 | ||
| Application note | Using bq2425x’s DPM Feature for Solar Panel Applications | 31 Jul 2013 | ||
| Application note | Selecting the Best bq2425x Single Cell I2C, Standalone Switch-Mode Battery Charg | 17 Jun 2013 | ||
| User guide | bq24257EVM-150, Single-Cell Li-Ion Switch-Mode Charger (Rev. A) | 03 Apr 2013 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
Driver or library
BQ24257SW-LINUX — Linux Driver for BQ2425x
The Linux driver supports the BQ2425x switch-mode Li-ion battery charger. The Linux driver supports communication through the I2C bus and interfaces with the power supply sub-system.
Linux mainline status
Available in Linux mainline: Yes
Available through git.ti.com: N/A
Linux source files
The files (...)
Calculation tool
SLUC436 — Thermal TS bq2425x Calculator Tool
Supported products & hardware
Products
Battery charger ICs
Hardware development
Evaluation board
| Package | Pins | Download |
|---|---|---|
| DSBGA (YFF) | 30 | View options |
| VQFN (RGE) | 24 | View options |
Ordering & quality
Information included:
- RoHS
- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
Information included:
- Fab location
- Assembly location
Support & training
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