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FS3871
General Description
The FS3871 Lithium-Ion (Li-Ion) and Lithium-Polymer (Li-Pol) linear charge-management ICs are designed for cost sensitive and compact portable electronics. They combine high-accuracy current and voltage regulation, battery conditioning, temperature monitoring, charge termination, charge-status indication, and Automatic charge-rate compensation in a single 8-pin IC. TSSOP package is offered to fit a wide range of end applications.
The FS3871 continuously measures battery temperature using an external thermistor. For safety, the FS3871 inhibits charge until the battery temperature is within user-defined thresholds. The FS3871 then charges the battery in three phases: conditioning, constant current and constant voltage. If the battery voltage is below the low-voltage threshold, V(min), the FS3871 pre-charges using a low current to condition the battery. The conditioning charge rate is approximately 10% of the regulation current. The conditioning current also minimizes heat dissipation in the external pass element during the initial stage of the charge. After conditioning, the FS3871 applies a constant current to the battery. An external sense-resistor sets the current. The sense-resistor can be on either the high or low side of the battery without additional components. The constant-current phase continues until the battery reaches the charge-regulation voltage.
The available 8-pin TSSOP-8/MSOP-8 package is offered for balanced area and cost effective requirements for size-sensitive applications.
The FS3871 is suitable for the control of charge sequences of a variety of portable battery-powered applications, such as cellular phone’s travel and base charger devices, digital camera, digital-video camcorder (DV), MP3 player ,etc.
Feature
| • | Ideal for Single (4.1 V or 4.2 V) and Dual-Cell (8.2 V or 8.4 V) Li-Ion or Li-Poly Packs (Dual-Cell is not available now) |
| • | 0.3 V dropout voltage for minimizing heat dissipation |
| • | Better than ±1% voltage regulation accuracy with preset voltages |
| • | Automatic Dynamic Compensation of battery packs internal impedance to reduce charge time |
| • | Optional cell-temperature monitoring before and during charge |
| • | Integrated voltage and current regulation with programmable charge-current and high or low-side current sensing |
| • | Integrated cell conditioning for reviving deeply discharged cells and minimizing heat dissipation during initial stage of charge |
| • | Charge status output for single or dual LED or host processor interface |
| • | Automatic battery-recharge feature |
| • | Charge termination by minimum current |
| • | Automatic low-power sleep mode when VCC is removed |
| • | Low-cost peripheral components of capacitor and resistor combinations for minimum BOM cost in manufacturing considerations |
| • | Evaluation (EV) board is available for quick evaluation |
| • | TSSOP-8/MSOP-8 Pb-free Package. |
Application
| • | Cellular phone external base or built-in charger |
| • | MP3/MP4 player |
| • | External charger through USB |
| • | Digital still camera (DSC) |
| • | Digital video camcorder (DV) |
| • | Portable electronic device charger, etc. |
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