Datasheet BQ2158TMODULE, BQ2158TB-002, BQ2158TB-001 Datasheet (Texas Instruments)

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Features

Complete and compact lithium-ion pack supervisor

Provides overvoltage, undervoltage, and overcurrent protection for two series Li-Ion cells

Combines bq2058T with charge/discharge control FETs

Low side low on-resistance FETs

Designed for battery pack integration

–

Direct connection for series battery terminals

–

Measures 1.70 X 0.70 inches

Low standby and operating currents

General Description

The bq2158T provides a complete solution for the supervision of two series Li-Ion cells. Designed for battery pack integration, the bq2158T incorporates a bq2058T Pack Supervisor, two FETs, and all other components required to monitor overvoltage, undervoltage, and overcurrent conditions. The board provides direct connections for the negative and positive terminals of each cell. See Figure 1. Please refer to the bq2058T data sheet for specific information on the operation of the bq2058T.

Unitrode configures the bq2158T based on the informa

tion in Table 1.

Pin Descriptions

B1P

Battery 1 positive input

B1N

Battery 1 negative input

B2N

Battery 2 negative input

POS

Pack positive

NEG

Pack negative

Two Series Cell

Li-Ion Pack Supervisor Module

Preliminary bq2158T

4/99

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Customer Name: ___________________________________________________________________________

Contact: _________________________________________ Phone: ______________________________

Address: _________________________________________________________________________________

_________________________________________________________________________________

Sales Contact: ____________________________________ Phone: ______________________________

Overvoltage threshold (4.25V) ________________________________________

Charge current (3.8A max.) ________________________________________

Discharge current (3.8A max.) ________________________________________

FAE approval: ____________________________________ Date:________________________________

Table 1. bq2158T Module Configuration

bq2158T

Preliminary

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Operation

The bq2158T monitors each series element for undervoltage, over-voltage, and over-current conditions. If a cell falls below V

for t

UVD

, the bq2158T enters into

sleep mode. The bq2158T wakes up and enables dis

charge if a voltage, V

higher than the battery voltage, is applied across POS and NEG. Charging is disabled if a cell exceeds V

for t

OVD

, and can resume when the

cell falls below the V

threshold. The bq2158T turns

the discharge FET off if the steady state load current ex

ceeds I

for t

OCD

and turns it back on if the load is re

moved.

FG2158Tcd.eps

Load

Charger

POS

NEG

B1P

B1N

B2N

Note: B1P, B2N, POS, and NEG accomodate a #20 AWG stranded wire.

B1N accomodates a #24 AWG stranded wire.

Figure 1. Module Connection Diagram

Preliminary

bq2158T

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bq2158t-b6/18/98

bq2158T Schematic

bq2158T

Preliminary

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.700

.000

2x .055

3x 1.645

2x .055

2x .645

.000

.355

POS

B1P B1N

B2N

.068

1.700

TP1

C2C5C6

NEG

.031

LAYER 1

LAYER 2

bq2158T Board

Preliminary

bq2158T

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Absolute Maximum Ratings

Symbol Parameter Value Unit Conditions

Supply voltage (B1P to B2N) 12 V DC

Maximum transient voltage (B1P to B2N) 32 V

Maximum duration =

1.5µs

CHG

Charging voltage (POS to NEG) 12 V

CHG

Continuous charge/discharge current 3.8 A

> 4V

= 25°C

OPR

Operating temperature -30 to +70 °C

STG

Storage temperature -55 to +125 °C

Note: Permanent device damage may occur if Absolute Maximum Ratings are exceeded. Functional operation

should be limited to the Recommended DC Operating Conditions detailed in this data sheet. Exposure to con

ditions beyond the operational limits for extended periods of time may affect device reliability.

DC Electrical Characteristics (T

= T

OPR

)

Symbol Parameter Minimum Typical Maximum Unit Conditions/Notes

Operating voltage, B1P to B2N

4.0 - 12 V

CCA

Operating current - 26 43

CCS

Sleep current - 0.7 1.5

No load across POS and NEG

On resistance, B2N to NEG - - 100

Ω

= 25°C

= 4.5V

bq2158T

Preliminary

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DC Thresholds (T

= T

OPR

)

Symbol Parameter Value Tolerance Unit Notes

Overvoltage threshold 4.25

50mV V

Charge enable voltage VOV- 100mV

50mV V

Undervoltage limit 2.25

100mV V

Overcurrent limit

3.3 A

= 25°C

= 60°C

UVD

Undervoltage delay 950

±50%

= 30°C

Charge detect threshold 70 -60, +80 mV

OVD

Overvoltage delay 950

±50%

= 30°C

OCD

Overcurrent delay 12

±60%

= 30°C

Ordering Information

Notes: 1. Requires configuration sheet (Table 1)

2. Example production part number: bq2158TB-001

bq2158T B —

Customer Code:

Blank = Sample or Pre-production

XXX = Customer-specific; assigned by Unitrode

Package Option:

B = Board-level product

Device:

Two-Series Cell Li-Ion Supervisor Module

Preliminary

bq2158T

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IMPORTANT NOTICE

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TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements.

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