The bq2058T Lithium Ion Pack Supervisor is a small, integrated product that provides over-voltage, under-voltage protection and overcurrent monitoring for two lithium-ion (Li-Ion) series cells, accommodating battery packs containing series/parallel configurations. The low operating current does not overdischarge the cells during periods of storage and does not significantly increase the system discharge load. The bq2058T can be part of a low-cost Li-Ion charge control system within the battery pack. The bq2058T controls two external FETs to limit the charge and discharge potentials. The bq2058T 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 open-drain CHG pin goes to the high-impedance state, shutting off charge to the battery pack. This safety feature prevents overcharge of any cell within the battery pack. After an over-voltage condition occurs, each cell must fall below VCE (charge enable voltage) for the bq2058T to re-enable charging.
The bq2058T is a Lithium Ion Pack Supervisor designed to control the charge and discharge cell voltage limits for two lithium-ion (Li-Ion) series cells. It accommodates battery packs containing series/parallel configurations and features low operating current to prevent overdischarge during storage periods.
The device controls two external FETs to limit charge and discharge potentials, preventing overvoltage and undervoltage conditions on individual cells. It also monitors for overcurrent conditions such as short circuits. The bq2058T is available with selectable overvoltage thresholds programmed at Benchmarq.
| Supply Current | 12uA typical |
|---|---|
| Sleep Current | 0.7uA typical |
| Package Type | 16-pin 150-mil narrow SOIC |
| Standard Overvoltage Threshold | 4.25V |
| Undervoltage Limit (Vuv) | 2.25V |
The standard version has an overvoltage limit of 4.25V.
It drives the DSG output low to disable discharge and enters low-power sleep mode when a cell voltage drops below Vuv for a configurable delay.