General Description

    The EMC5755 is a complete linear charger for single cell lithium-ion batteries. With small TDFN-6 package and few external components, EMC5755 is well suited for portable applications. In addition, the EMC5755 is specifically designed to work within USB power specifications. No external sense resistor and blocking diode are  required. Charging current can be programmed

externally with a single resistor. The built-in thermal regulation facilitates charging with maximum power without risk of overheating.

    The EMC5755 always preconditions the battery with 1/10 of the programmed charge current at the beginning of a charge cycle, until 40μs after it verifies that the battery can be fast-charged.           

    The EMC5755 automatically terminates the charge cycle when the charge current drops to 1/10th the programmed value after the final float voltage is reached.

The EMC5755 consumes zero reverse current from the battery at standby, shutdown and sleep modes. This feature reduces the charge and discharge cycles on the battery, further prolonging the battery life. The EMC5755 can also be used as a LDO when battery is removed. Other features include shutdown mode, charge current monitor, under voltage lockout, automatic recharge and status indicator.

 

Features

􀂄 Programmable charge current up to 1.2A

􀂄 No MOSFET, sense resistor or blocking diode required

􀂄 Complete linear charger in TDFN-6 for single cell Lithium-ion batteries

􀂄 Typical zero reverse current from battery

􀂄 Thermal regulation maximizes charge rate without risk of overheating

􀂄 Charges single cell Li-ion batteries directly fromUSB port

􀂄 Act as a LDO when battery is removed

􀂄 Preset 4.2V charge voltage with ±1% accuracy

􀂄 Automatic recharge

􀂄 Charge status indicator

􀂄 C/10 charge termination

􀂄 45μA shutdown supply current

􀂄 2.9V trickle charge threshold

􀂄 Soft-start limits inrush current

􀂄 RoHS compliant and Pb-free

 

Applications

􀂄 Wireless handsets

􀂄 Hand-held instruments

􀂄 Portable information appliances

􀂄 Bluetooth application

􀂄 Charging docks and cradles