Texas Instruments bq2058 Data Sheet & Manual

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bq2058

Lithium Ion Pack Supervisor for 3- and 4-Cell Packs

vents overcharge of any cell within

Features General Description

the battery pack. After an overvolt- age condition occurs, each cell must

Protects and individually moni- The bq2058 Lithium Ion Pack Super-

fall below VCE (charge enable voltage)

tors three or four Li-Ion series visor is designed to control the charge

for the bq2058 to re-enable charging.

cells for overvoltage, undervolt- and discharge cell voltages for three or age four lithium ion (Li-Ion) series cells, The bq2058 protects batteries from accommodating battery packs contain- overdischarge. If the voltage on any

Monitors pack for overcurrent

ing series/parallel configurations. The cell falls below VUV (undervoltage low operating current does not over- limit) for user-configurable delay pe-

Designed for battery pack inte-

discharge the cells during periods of riod (t UVD), the DSG output is driven

gration

storage and does not significantly in- high, shutting off the battery dis-

Minimal external components crease the system discharge load. The charge. This safety feature prevents

bq2058 can be part of low-cost Li-Ion overdischarge of any cell within the

Drives external FET switches

charge control system within the bat- battery pack. tery pack.

Selectable overvoltage (VOV)

The bq2058 also stops discharge on

thresholds

The bq2058 controls two external FETs detection of an overcurrent condition, to limit the charge and discharge poten- such as short circuit. If an overcur-

Mask-programmable by

tials. The bq2058 allows charging when rent condition occurs for user-

Unitrode

each individual cell voltage is below VOV configurable delay period (t OCD), the (overvoltage limit). If the voltage on any DSG output is driven high, disconnect-

Standard version–4.25V

cell exceeds VOV for user-configurable ing the load from the pack. DSG re- delay period (t OVD), the CHG pin is mains high until removal of the short

Supply current: 25µA typical

driven high, shutting off charge to the circuit or overcurrent condition. Sleep current: 0.7µA typical battery pack. This safety feature pre-

16-pin 150-mil narrow SOIC

Pin Connections Pin Names

DSG Discharge control output

CHG Charge control output

CHG DSG NSEL 3- or 4-cell selection

CTL Pack disable input

CTL NSEL

UVD Undervoltage delay input

VSS Low potential input

VSS UVD

OVD Overvoltage delay input

CSL OVD CSL Current sense low-side

input OCD Overcurrent delay input

BAT4N OCD

BAT3N VCC BAT4N Battery 4 negative input

VCC High potential input

BAT2N CSH

BAT3N Battery 3 negative input CSH Current sense high-side

BAT1N BAT1P

input

BAT2N Battery 2 negative input

16-Pin Narrow SOIC BAT1P Battery 1 positive input

PN205801.eps BAT1N Battery 1 negative input