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BQ2058FSN Datasheet(PDF) 1 Page - Texas Instruments |
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BQ2058FSN Datasheet(HTML) 1 Page - Texas Instruments |
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1 / 14 page  1 Features ➤ Protects and individually moni- tors three or four Li-Ion series cells for overvoltage, undervolt- age ➤ Monitors pack for overcurrent ➤ Designed for battery pack inte- gration ➤ Minimal external components ➤ Drives external FET switches ➤ Selectable overvoltage (VOV) thresholds - Mask-programmable by Unitrode - Standard version–4.25V ➤ Supply current: 25µA typical ➤ Sleep current: 0.7µA typical ➤ 16-pin 150-mil narrow SOIC General Description The bq2058 Lithium Ion Pack Super- visor is designed to control the charge and discharge cell voltages for three or four lithium ion (Li-Ion) series cells, accommodating battery packs contain- ing series/parallel configurations. The low operating current does not over- discharge the cells during periods of storage and does not significantly in- crease the system discharge load. The bq2058 can be part of a low-cost Li-Ion charge control system within the bat- tery pack. The bq2058 controls two external FETs to limit the charge and discharge poten- tials. The bq2058 allows charging when each individual cell voltage is below VOV (overvoltage limit). If the voltage on any cell exceeds VOV for a user-configurable delay period (tOVD), the CHG pin is driven high, shutting off charge to the battery pack. This safety feature pre- vents overcharge of any cell within the battery pack. After an overvolt- age condition occurs, each cell must fall below VCE (charge enable voltage) for the bq2058 to re-enable charging. The bq2058 protects batteries from overdischarge. If the voltage on any cell falls below VUV (undervoltage limit) for a user-configurable delay pe- riod (tUVD), the DSG output is driven high, shutting off the battery dis- charge. This safety feature prevents overdischarge of any cell within the battery pack. The bq2058 also stops discharge on detection of an overcurrent condition, such as a short circuit. If an overcur- rent condition occurs for a user- configurable delay period (tOCD), the DSG output is driven high, disconnect- ing the load from the pack. DSG re- mains high until removal of the short circuit or overcurrent condition. bq2058 Lithium Ion Pack Supervisor for 3- and 4-Cell Packs 1 PN205801.eps 16-Pin Narrow SOIC 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 DSG NSEL UVD OVD OCD VCC CSH BAT1P CHG CTL VSS CSL BAT4N BAT3N BAT2N BAT1N Pin Connections CHG Charge control output CTL Pack disable input VSS Low potential input CSL Current sense low-side input BAT4N Battery 4 negative input BAT3N Battery 3 negative input BAT2N Battery 2 negative input BAT1N Battery 1 negative input DSG Discharge control output NSEL 3- or 4-cell selection UVD Undervoltage delay input OVD Overvoltage delay input OCD Overcurrent delay input VCC High potential input CSH Current sense high-side input BAT1P Battery 1 positive input Pin Names 1/99 I |
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