SGM40561.pdf
No.11029
● 4.2V/4.3V/4.35V Charge Voltage
● 5mA to 200mA Charger for Tiny Cell Li-Ion or Polymer Batteries
● Integrated Pass Element and Current Sensor
● No External Blocking Diode Required
● Low Component Count
● Programmable Charge Current
● Programmable Full-of-Charge Current
● Charge Current Thermal Foldback Protection
● 2.55V/2.62V/2.65V Trickle Charge Threshold
● 10.5V Input Over-Voltage Protection
● 26.5V Maximum Voltage Power Input
● Power Presence and Charging Indications
● Less than 1μA Leakage Current off the Battery When
No Input Power Attached or Charger Disabled
● Available in Green TDFN-2×2-8L Package
The SGM40561 is a fully integrated high input voltage single-cell Li-Ion battery charger. The charger uses a CC/CV charge profile required by Li-Ion battery. The charger accepts an input voltage up to 26.5V but is disabled when the input voltage exceeds the OVP threshold, typically 10.5V, to prevent excessive power dissipation. The 26.5V rating eliminates the over- voltage protection circuit required in a low input voltage charger.
The charge current and the full-of-charge (FOC) current are programmable with external resistors. When the battery voltage is lower than typically 2.55V (SGM40561-4.2), 2.62V (SGM40561-4.3) or 2.65V (SGM40561-4.35), the charger preconditions the battery with typically 19% of the programmed charge current. When the charge current reduces to the programmable FOC current level during the CV charge phase, an FOC indication is provided by the CHG pin, which is an open-drain output. An internal thermal foldback function protects the charger from any thermal failure.
Two indication pins (PPR and 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.
