Calculation tool
BQ24618
Standalone 1-6 cell Buck battery charge controller USB friendly with 5V-28V input
Data sheet
BQ24618
- USB-Friendly 4.7-V to 28-V Input Operating
Range - Stand-Alone Charge Controller to Support 1 to 6
Li-Ion or Li-Polymer Battery Cells - Up to 10-A Charge Current and Adapter Current
- 600-kHz NMOS-NMOS Synchronous Buck
Converter - High-Accuracy Voltage and Current Regulation
- ±0.5% Charge Voltage Accuracy
- ±3% Charge Current Accuracy
- ±3% Adapter Current Accuracy
- Integration
- Automatic System Power Selection From
Adapter or Battery - Internal Loop Compensation
- Internal Soft Start
- Dynamic Power Management
- Automatic System Power Selection From
- Safety Protection
- Input Overvoltage Protection
- Battery Thermistor Sense Hot/Cold Charge
Suspend - Battery Detection
- Reverse-Protection Input FET
- Programmable Safety Timer
- Charge Overcurrent Protection
- Battery Short Protection
- Battery Overvoltage Protection
- Thermal Shutdown
- Status Outputs
- Adapter Present
- Charger Operation Status
- Charge Enable Pin
- 6-V Gate Drive for Synchronous Buck Converter
- 30-ns Driver Dead-Time and 99.5% Maximum
Effective Duty Cycle - Energy Star Low Quiescent Current Iq
- < 15-µA Off-State Battery Discharge Current
- < 1.5-mA Off-State Input Quiescent Current
- APPLICATIONS
- Tablet PCs
- Smart Phones
- Portable Media Players, Navigation Devices,
Notebooks and Ultra-Mobile PCs - Personal Digital Assistants
- Handheld Terminals
- Industrial and Medical Equipment
All other trademarks are the property of their respective owners
The bq24618 device is highly integrated Li-ion or Li-polymer switched-mode battery-charge controller. The bq24618 offers a constant-frequency synchronous switching PWM controller with high-accuracy charge current and voltage regulation, charge preconditioning, termination, adapter current regulation and charge status monitoring.
The bq24618 operates from either a USB port or AC adapter and supports charge currents up to 10 A. The device charges the battery in three phases: preconditioning, constant current, and constant voltage. Charge is terminated when the current reaches a minimum user-selectable level. A programmable charge timer provides a safety backup for charge termination. The bq24618 automatically restarts the charge cycle if the battery voltage falls below an internal threshold, and enters a low-quiescent current sleep mode when the input voltage falls below the battery voltage.
Technical documentation
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View all 2 | Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | bq24618 Stand-Alone USB-Friendly Synchronous Switched-Mode Li-Ion or Li-Polymer Battery Charger With System Power Selector and Low Iq datasheet (Rev. B) | PDF | HTML | 29 Apr 2015 |
| Application note | BQ241xx/BQ246xx Selection of Multi-Cell Standalone Switching Battery Chargers | 31 Dec 2019 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| VQFN (RGE) | 24 | Ultra Librarian |
Ordering & quality
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- Lead finish/Ball material
- MSL rating/Peak reflow
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Information included:
- Fab location
- Assembly location
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