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.
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| Number of series cells | 1, 2, 3, 4, 5, 6 |
| Charge current (max) (A) | 10 |
| Vin (max) (V) | 28 |
| Cell chemistry | Li-Ion/Li-Polymer |
| Battery charge voltage (min) (V) | 2.1 |
| Battery charge voltage (max) (V) | 26 |
| Absolute max Vin (max) (V) | 33 |
| Control topology | Switch-Mode Buck |
| Control interface | Standalone (RC-Settable) |
| Features | BAT temp thermistor monitoring (hot/cold profile), IINDPM (Input current limit), Power Path |
| Vin (min) (V) | 4.7 |
| Rating | Catalog |
| Operating temperature range (°C) | -40 to 85 |
| VQFN (RGE) | 24 | 16 mm² 4 x 4 |
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