BQ2970 Datasheet, PDF (4/31 Pages) Texas Instruments – Cost-Effective Voltage and Current Protection Integrated Circuit

bq2970, bq2971, bq2972, bq2973
SLUSBU9C – MARCH 2014 – REVISED MARCH 2016
6 Pin Configuration and Functions
DSE Package
6-PIN WSON
Top View
NC
1
COUT
2
DOUT
3
6
V–
5
BAT
4
VSS
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NAME
BAT
COUT
DOUT
NC
VSS
V–
PIN
NO.
5
2
3
1
4
6
TYPE
P
O
O
NC
P
I/O
Pin Functions
DESCRIPTION
VDD pin
Gate Drive Output for Charge FET
Gate Drive Output for Discharge FET
No Connection (electrically open, do not connect to BAT or VSS)
Ground pin
Input pin for charger negative voltage
6.1 Pin Descriptions
6.1.1 Supply Input: BAT
This pin is the input supply for the device and is connected to the positive terminal of the battery pack. There is a
0.1-µF input capacitor to ground for filtering noise.
6.1.2 Cell Negative Connection: VSS
This pin is an input to the device for cell negative ground reference. Internal circuits associated with cell voltage
measurements and overcurrent protection input to differential amplifier for either Vds sensing or external sense
resistor sensing will be referenced to this node.
6.1.3 Voltage Sense Node: V–
This is a sense node used for measuring several fault detection conditions, such as overcurrent charging or
overcurrent discharging configured as Vds sensing for protection. This input, in conjunction with VSS, forms the
differential measurement for the stated fault detection conditions. A 2.2-kΩ resistor is connected between this
input pin and Pack– terminal of the system in the application.
6.1.4 Discharge FET Gate Drive Output: DOUT
This pin is an output to control the discharge FET. The output is driven from an internal circuitry connected to the
BAT supply. This output will transition from high to low when a fault is detected, and requires the DSG FET to
turn OFF. A high impedance resistor of 5 MΩ is connected from DOUT to VSS for gate capacitance discharge
when the FET is turned OFF.
6.1.5 Charge FET Gate Drive Output: COUT
This pin is an output to control the charge FET. The output is driven from an internal circuitry connected to the
BAT supply. This output transitions from high to low when a fault is detected, and requires the CHG FET to turn
OFF. A high impedance resistor of 5 MΩ is connected from COUT to Pack– for gate capacitance discharge when
FET is turned OFF.
4
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