EUP8218-2A Single Cell Switchmode Li-Ion/Polymer Battery Charger with
System Power-Path Selection and Automatic USB/Charger Detection DataSheet
DESCRIPTION
The EUP8218 is a highly integrated single cell Li-ion and Li-polymer battery charger. It integrates a constantfrequency PWM controller with high accuracy regulation of input current, charge current, and voltage. It also provides battery detection, pre-conditioning, charge termination, and charge status monitoring.
The EUP8218 provides power path selection function. When the qualified adapter is present, the system is powered by the adapter. Otherwise, the system is powered by the battery. It also integrates an USBconnection-monitoring device used to determine if a standard USB device or a battery-charging device is
connected.
The EUP8218 charges the battery in three phases:pre-conditioning, fast-charge constant current and constant voltage. In all stages, an internal control loop monitors the IC junction temperature and reduce charge current if the internal temperature threshold (120°C) is exceeded.Additionally, a battery pack thermistor monitoring input(TS) is included that monitors battery temperature for safety charging.
Charge is terminated when the current reaches 10% of the fast charge rate. A programmable charge timer offers a safety back up. The EUP8218 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.
The EUP8218 features Dynamic Power Management (DPM) to reduce the charge current when the input power limit is reached to avoid over-loading the adapter. A
highly-accurate current-sense amplifier enables precise measurement of input current from adapter to monitor overall system power.
The EUP8218 is available in a 28-pin, 4mm´4mm TQFN package.
FEATURES
4.5V-20V Input Operating Range
High Integration
- Automatic Power Path Selector BetweenAdapter and Battery
- Automatic USB/Charger Detection
- Dynamic Power Management
- Integrated 20V High Side Switching MOSFET
Safety
- Thermal Regulation Loop Throttles Back Current to Limit Tj=120°C
- Thermal Shutdown
- Battery Thermistor Sense Hot/Cold Charge Suspend & Battery Detect
- Input Over-Voltage Protection with Programmable Thereshold
Accuracy
- ±1% Charge Voltage Regulation
- ±10% Charge Current Regulation
- ±10% Input Current Regulation
Less than 25μA Battery Current with Adapter Removed
Less than 5mA Input Current with Adapter Present and Charge Disabled
4mm´4mm TQFN-28 Package
RoHS Compliant and 100% Lead (Pb)-Free Halogen-Free
APPLICATIONS
Mobile and Smart Phones
Tablet PC
Handheld Devices
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