Packaging information
| Package | Pins DSBGA (YFF) | 20 |
| Operating temperature range (°C) -40 to 125 |
| Package qty | Carrier 3,000 | LARGE T&R |
Features for the BQ24157S
- Integrated Power FETs for up to 1.55-A Charge
Rate - Spread Spectrum Frequency Control for Improved
EMI Performance - High-Accuracy Voltage and Current Regulation
- Input Current Regulation Accuracy:
±5% (100 mA and 500 mA) - Charge Voltage Regulation Accuracy:
±0.5% (25°C), ±1% (0°C to 125°C) - Charge Current Regulation Accuracy: ±5%
- Input Current Regulation Accuracy:
- Factory Test-Mode for GSM Calibration Without a
Battery - Input Voltage Based Dynamic Power
Management (VIN DPM) - Bad Adaptor Detection and Rejection
- Safety Limit Register for Maximum Charge
Voltage and Current Limiting - High-Efficiency Mini-USB/AC Battery Charger for
Single-Cell Li-Ion and Li-Polymer Battery Packs - 20-V Absolute Maximum Input Voltage Rating
- 6.5-V Maximum Operating Input Voltage
- Programmable Charge Parameters through I2C
Compatible Interface (up to 3.4 Mbps):- Input Current Limit
- VIN DPM Threshold
- Fast-Charge/Termination Current
- Charge Regulation Voltage (3.5 to 4.44 V)
- Low Charge Current Mode Enable/Disable
- Termination Enable/Disable
- Synchronous Fixed-Frequency PWM Controller
Operating at 3 MHz With 0% to 99.5% Duty Cycle - Automatic High Impedance Mode for Low Power
Consumption - Robust Protection
- Reverse Leakage Protection Prevents Battery
Drainage - Thermal Regulation and Protection
- Input/Output Overvoltage Protection
- Reverse Leakage Protection Prevents Battery
- Status Output for Charging and Faults
- USB Friendly Boot-Up Sequence
- Automatic Charging
- Power Up System Without Battery
- Boost Mode Operation for USB OTG:
- Input Voltage Range (from Battery):
3.2 to 4.5 V - Output for VBUS: 5.05 V, 350 mA
- Input Voltage Range (from Battery):
- 2.1 × 2.0-mm, 20-Pin DSBGA Package
- Pin-to-Pin Compatible With bq24157 and bq24158
Description for the BQ24157S
The bq24157S is a compact, flexible, high-efficiency, USB-friendly switch-mode charge management device for single-cell Li-ion and Li-polymer batteries used in a wide range of portable applications. The charge parameters can be programmed through an I2C interface. The IC integrates a synchronous PWM controller, power MOSFETs, input current sensing, high-accuracy current and voltage regulation, and charge termination, into a small DSBGA package.
The IC charges the battery in three phases: conditioning, constant current, and constant voltage. The input current is automatically limited to the value set by the host.
Charge is terminated based on battery voltage and user-selectable minimum current level. During normal operation, the IC automatically restarts the charge cycle if the battery voltage falls below an internal threshold and automatically enters sleep mode or high impedance mode when the input supply is removed. The charge status can be reported to the host using the I2C interface. During the charging process, the IC monitors its junction temperature (TJ) and reduces the charge current after TJ increases to about 125°C. To support a USB OTG device, bq24157S can provide VBUS (5.05 V) by boosting the battery voltage. The IC is available in 20-pin DSBGA package.