General Description

  The ET9515 is a cost-effective, fully integrated high input voltage single-cell Li-ion battery charger. Thecharger uses a CC/CV charge profile required by Li-ion battery. The charger accepts an input voltage up to 28V but is disabled when the input voltage exceeds the OVP threshold, typically 6.8V (ET9515-6.8) or 10.5V (ET9515-10.5), to prevent excessive power dissipation. The 28V rating eliminates the over-voltage protection circuit required in a low input voltage charger.

  The charge current and the end-of-charge (EOC) current are programmable with external resistors. When the battery voltage is lower than typically 2.55V, the charger preconditions the battery with typically 18% of the programmed charge current. When the charge current reduces to the programmable EOC current level during the CV charge phase, an EOC indication is provided by the CHGpin, which is an open-drain output. An internal thermal foldback function protects the charger from any thermal failure.

  Two indication pins (PPRand CHG) allow simple interface to a microprocessor or LEDs. When no adapter is attached or when disabled, the charger draws less than 1μA leakage current from the battery.

  The ET9515 is available in Green TDFN-3×3-8L, TDFN-2×3-8L, TDFN-2×2-8L, TDFN-1.6×1.2-8L and SOIC-8 (Exposed Pad) packages and is rated over the -40℃ to +85℃temperature range.

Features

●  Complete Charger for Single-Cell Li-ion or Polymer Batteries

●  Integrated Pass Element and Current Sensor

●  No External Blocking Diode Required

●  Low Component Count and Cost

●  Programmable Charge Current

●  Programmable End-of-Charge Current

●  Charge Current Thermal Foldback for Thermal Protection

●  2.55V Trickle Charge Threshold

●  6.8V Input Over-Voltage Protection for ET9515A

●  10.5V Input Over-Voltage Protection for ET9515B

●  28V Maximum Voltage for the Power Input

●  Power Presence and Charge Indications

●  1μA Leakage Current off the Battery When No Input Power Attached or Charger Disabled

●  Available in Green TDFN-3×3-8L, TDFN-2×3-8L,TDFN-2×2-8L ,TDFN-1.6×1.2-8L , SOT23-6 and SOIC-8 (Exposed Pad) Packages

Application

●  Mobile Phones

●  Blue-Tooth Devices

●  MP3 Players

●  Stand-Alone Chargers

●  Other Handheld Devices

Pin Configuration

Application Circuits