EMC5051-2A Li-ion/Li Polymer Battery Charger DataSheet
The EMC5051 is a highly-integrated battery charger for single-cell Li-ion or Li-polymer batteries capable of operating with an input voltage reached 2.5V. It is a complete charger device designed to work with an USB port or 5V output AC adapter.
The EMC5051 operates with CC (constant current) mode and CV (constant voltage) mode profiles. A low-current preconditioning charge mode is also provided as a trickle charging operation. The charge current is programmable up to 2A with an external resistor or a logic input. The charge voltage is 1% accurate over the full application range.
When operating with a current-limited adapter, the charger minimizes the thermal dissipation with pulsed operations to prevent overheat conditions that is commonly occurred with conventional linear chargers. The EMC5051 reduces charge current for thermal fold-back to ensure product safe operation.
The charger automatically re-charges the battery when the battery voltage drops blow a recharge threshold. The chip includes a safety timer for setting the fast charge time limit in case of charging a dead battery.
Additional features include preconditioning of an over-discharged battery and charging the battery in a safe temperature range with an NTC thermistor interface. The thermally enhanced TQFN packages are offered for space limited handheld applications.
Complete Charger for Single-Cell Li-ion Batteries
Charges from either AC Adapter or USB Port
Integrated Power Pass Device with Current Sensing
No External Blocking Diode Required
Pre-charge Condition with Safety Timing
1% Charger Voltage Accuracy
Programmable Current Limit up to 2A
Programmable End-of-Charge Current
Sleep Mode for Power Saving
Charge Current Thermal Fold-back
NTC Thermistor Interface for Battery Temperature
Stand-Alone or Integrated Charger
Ambient Temperature Range: -40°C to +85°C
Thermally-Enhanced TQFN-16L 4mmx4mm Packages
Pb-Free Plus Anneal Available (RoHS Compliant
PDAs, Cell Phones and Smart Phones
Digital Camera, MP3 and Handheld Gamming
Portable Instruments including Medical Handhelds
Self-Charging Battery Packs
Stand-Alone Chargers or USB Port Chargers