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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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LM3622 bảng dữ liệu(PDF) 1 Page - National Semiconductor (TI) |
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LM3622 bảng dữ liệu(HTML) 1 Page - National Semiconductor (TI) |
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1 / 9 page  LM3622 Lithium-Ion Battery Charger Controller General Description The LM3622 is a charge controller for Lithium-Ion batteries. This monolithic integrated circuit accurately controls an ex- ternal pass transistor for precision Lithium-Ion battery charg- ing. The LM3622 provides a constant voltage or constant current (CVCC) configuration that changes, as necessary, to optimally charge lithium-ion battery cells. Voltage charging versions (4.1V, 4.2V, 8.2V, and 8.4V) are available for one or two cell battery packs and for coke or graphite anode battery chemistry. The LM3622 accepts input voltages from 4.5V to 24V. Con- troller accuracy over temperature is ±30mV/cell for A grade and ±50mV/cell for the standard grade. No precision exter- nal resistors are required. Furthermore, the LM3622’s propri- etary output voltage sensing circuit drains less than 200nA from the battery when the input source is disconnected. The LM3622 circuitry includes functions for regulating the charge voltage with a temperature compensated bandgap reference and regulating the current with an external sense resistor. The internal bandgap insures excellent controller performance over the operating temperature and input sup- ply range. The LM3622 can sink 15mA minimum at the EXT pin to drive the base of an external PNP pass transistor. It also has low-voltage battery threshold circuitry that removes this drive when the cell voltage drops below a preset limit. The LV SEL pin programs this threshold voltage to either 2.7V/cell or 2.15V/cell. The low-voltage detection, which is a user en- abled feature, provides an output signal that can be used to enable a ″wake up charge″ source automatically to precon- dition a deeply discharged pack. The LM3622 is available in a standard 8-lead SOIC surface mount package. Features n Versions for charging of 1 cell (4.1V or 4.2V) or 2 cells (8.2V or 8.4V) n Versions for coke or graphite anode n Precision (±30mV/cell) end-of-charge control n Wide input range: 4.5V-24V n Low battery drain leakage: 200nA n 15 mA available to drive low cost PNP Applications n Cellular phone cradle charger n PDA/Notebook cradle charger n Camcorder cradle charger Typical Application DS100974-1 February 2000 © 2000 National Semiconductor Corporation DS100974 www.national.com |
Số phần tương tự - LM3622 |
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Mô tả tương tự - LM3622 |
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