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发布者:微桥 发布时间:2012-3-28 阅读:5052次    关键字: 锂电充电
EMC5051-2A Li-ion/Li Polymer Battery Charger


EMC5051-2A Li-ion/Li Polymer Battery Charger DataSheet

General Description
    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.

Features
􀂄 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
􀂄 Monitor
􀂄 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

Applications
􀂄 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

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