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LP28021S Datasheet(PDF) 1 Page - Lowpower Semiconductor inc |
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LP28021S Datasheet(HTML) 1 Page - Lowpower Semiconductor inc |
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1 / 7 page  LP28021S-00 Jan.-2019 Email: marketing@lowpowersemi.com www.lowpowersemi.com Page 1 of 7 Preliminary Datasheet LP28021S 1A Single Chip Li-Ion and Li-Polymer Charger General Description The LP28021S is a complete constant-current/ constant voltage linear charger for single cell lithium-ion battery. Its TDFN-10 package and low external component count make the LP28021S ideally suited for portable applications. No external sense resistor is needed, and no blocking diode is required due to the internal MOSFET architecture. Thermal feedback regulates the charge current to limit the die temperature during high power operation or high ambient temperature. The charge voltage is fixed at 4.2V, and the charge current can be ISET programmed externally with a single resistor. The LP28021S automatically terminates the charge cycle when the charge current drops to 1/10 setting current value after the final float voltage is reached. When the input supply is removed, the LP28021S automatically enters a low current state, dropping the battery drain current to less than 1µA. Other features include charge current monitor, under voltage lockout, automatic recharge and a status pin. Order Information LP28021S F: Pb-Free Package Type QV: TDFN-10 Features Input Voltage up to 30V Battery Maximum Voltage up to 20V Input Over Voltage Protection：6.2V Short-circuit protection Programmable Charge Current up to 1A 1µA Battery Reverse Current Protection of Reverse Connection of Battery No MOSFET, Sense Resistor or Blocking Diode Required Constant-Current/Constant-Voltage Operation with Thermal Regulation to Maximize Charge Rate Without Risk of Overheating TDFN-10 3*3mm Package RoHS Compliant and 100% Lead (Pb)-Free Applications Portable Media Players/Game Power Bank Bluetooth Applications PDA/MID Marking Information Device Marking Package Shipping LP28021SQVF LP28021S YWX TDFN-10 3K/REEL Marking indication: Y:Production year W:Production week X: Series Number |
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