Texas Instruments bq2058T Data Handbook (1) Specifications User Guide

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bq2058T

Lithium Ion Pack Supervisor

For 2-Cell Packs charge to the battery pack. This safety

Features General Description

feature prevents overcharge of any cell within the battery pack. After an over-

Protects and individually moni- The bq2058T Lithium Ion Pack Su-

voltage condition occurs, each cell must

tors two Li-Ion series cells for pervisor is designed to control the

fall below VCE (charge enable voltage)

overvoltage, undervoltage charge and discharge cell voltage lim-

for the bq2058T to re-enable charging.

its for two lithium-ion (Li-Ion) series

Monitors pack for overcurrent

cells, accommodating battery packs The bq2058T protects batteries from containing series/parallel configura- overdischarge. If the voltage on any

Designed for battery pack inte-

tions. The low operating current does cell falls below VUV (undervoltage

gration

not overdischarge the cells during pe- limit) for user-configurable delay pe-

Minimal external components riods of storage and does not signifi- riod (t UVD), the DSG output is driven

cantly increase the system discharge low, shutting off the battery discharge.

Drives external FET switches

load. The bq2058T can be part of This safety feature prevents overdis- low-cost Li-Ion charge control system charge of any cell within the battery

Selectable overvoltage (VOV)

within the battery pack. pack.

thresholds

The bq2058T controls two external The bq2058T also stops discharge on

Mask programmable by

FETs to limit the charge and discharge detection of an overcurrent condition,

Benchmarq

potentials. The bq2058T allows charg- such as short circuit. If an overcur- ing when each individual cell voltage is rent condition occurs for user-

Standard version–4.25V

below VOV (overvoltage limit). If the configurable delay period (t OCD), the

voltage on any cell exceeds VOV for DSG output is driven low, disconnect-

Supply current: 12µA typical

user-configurable delay period (t OVD), ing the load from the pack. DSG re- Sleep current: 0.7µA typical the open-drain CHG pin goes to the mains low until removal of the short high-impedance state, shutting off circuit or overcurrent condition.

16-pin 150-mil narrow SOIC

Pin Connections Pin Names

DSG Discharge control output

CHG Charge control output

CHG DSG UVD Undervoltage delay input

CTL Pack disable input

CTL VCC

OVD Overvoltage delay input

VSS Low potential input

VSS UVD

OCD Overcurrent delay input

CSL OVD CSL Overcurrent sense low-side

input VCC High potential input

BAT2N OCD

BAT2N VCC BAT2N Battery negative input

CSH Overcurrent sense high-side

BAT2N CSH input

BAT1N Battery negative input

BAT1N BAT1P

BAT1P Battery positive input

16-Pin Narrow SOIC

PN2058T1.eps