Datasheet BQ2158MODULE, BQ2158B-003, BQ2158B-002, BQ2158B-001 Datasheet (Texas Instruments)

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Features

Complete and compact lithium-ion pack supervisor

Provides overvoltage, undervoltage, and overcurrent protection for three or four series Li-Ion cells

Combines bq2058 with charge/discharge control FETs

High side low on-resistance FETs

Designed for battery pack integration

–

Direct connection for series battery terminals

–

Measures 2.10 X 0.70 inches

Low standby and operating currents

General Description

The bq2158 provides a complete solution for the supervision of three or four series Li-Ion cells. Designed for battery pack integration, the bq2158 incorporates a bq2058 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 bq2058 data sheet for specific information on the operation of the bq2058.

Unitrode configures the bq2158 based on the informa

tion in Table 1.

Pin Descriptions

B1P

Battery 1 positive input/pack positive

B1N

Battery 1 negative input

B2N

Battery 2 negative input

B3N

Battery 3 negative input

B4N

Battery 4 negative input

POS

Pack positive

NEG

Pack negative

Three or Four Series Cell

Li-Ion Pack Supervisor Module

bq2158

5/99 B

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Customer Name: ___________________________________________________________________________

Contact: _________________________________________ Phone: ______________________________

Address: _________________________________________________________________________________

_________________________________________________________________________________

Sales Contact: ____________________________________ Phone: ______________________________

Number of series cells (3 or 4) ________________________________________

Overvoltage threshold (4.25, 4.30 or 4.35V) ________________________________________

Charge current (3.9A max.) ________________________________________

Discharge current (3.9A max.) ________________________________________

FAE approval: _____________________________________ Date: _______________________________

Table 1. bq2158 Module Configuration

bq2158

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Operation

The bq2158 monitors each series element for undervoltage, over-voltage, and over-current conditions. If a cell falls below V

for t

UVD

, the bq2158 enters into sleep mode. The bq2158 wakes up and enables discharge 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 bq2158 turns the discharge FET off if the steady state load current exceeds I

for t

OCD

and turns it back on if the load is removed.

FG2158cc.eps

B1P

Load

Charger

Three-Cell Configuration

POS

NEG

B1N

B2N

B3N

B4N

B1P

Load

Charger

Four-Cell Configuration

POS

NEG

B1N

B2N

B3N

B4N

Note: B1P, B4N, POS, and NEG accomodate a #20 AWG stranded wire. B1N, B2N, and B3N accomodate a #24 AWG stranded wire.

Figure 1. Module Connection Diagram

Number of Cells On-board bq2058 Configuration

3 cells

BAT1N tied to BAT1P

NSEL = V

4 cells

NSEL = V

Table 2. Pin Connections

bq2158

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bq2158 Schematic

bq2158

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6X .055

.055

.915

NEG

POS

B4N

B3N

B2N

B1N

B1P

1.065

1.440

1.640

1.845

2.045

.700

Q1 Q2

TP1O

R5 C2

C10

R1 R11

R10

2.100

.031

.065

.068

LAYER 1

LAYER 2

bq2158 Board

bq2158

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Absolute Maximum Ratings

Symbol Parameter Value Unit Conditions

Supply voltage (B1P to B4N) 18 V DC

Maximum transient voltage (B1P to B4N) 32 V

Maximum duration = 1.5µs

CHG

Charging voltage (POS to NEG) 18 V

CHG

Continuous charge/discharge current 3.9 A

> 6V

= 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

A=TOPR

)

Symbol Parameter Minimum Typical Maximum Unit Conditions/Notes

Operating voltage, B1P to B4N

4.0 - 18 V

CCA

Operating current - 39 57

CCS

Sleep current - 0.7 1.5

No load across POS and NEG

On resistance, B1P to POS - - 50

Ω

= 25°C

= 10V

bq2158

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DC Thresholds (T

A=TOPR

)

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

3.4 A

= 25°C

3.8 A

= 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

Note: The thresholds above reflect the operation of a bq2158 using the standard bq2058 IC (VOV= 4.25V).

Specify other versions of the bq2058 by indicating the appropriate V

threshold in Table 1.

bq2158

Ordering Information

Notes: 1. Requires configuration sheet (Table 1)

2. Example production part number: bq2158B-001

bq2158 B —

Customer Code:

Blank = Sample or Pre-production

XXX = Customer-specific; assigned by Unitrode

Package Option:

B = Board-level product

Device:

Three- or Four-Series Cell Li-Ion Supervisor Module

Change No. Page No. Description Nature of Change

1 3 Table 2 pin connections Clarified onboard bq2058 connection.

Note: Change 1 = May 1999 B changes from July 1996.

Data Sheet Revision History

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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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