Datasheet

100 W
0.47 Fm
Optional
Filter
First
Cell
Last
Cell
Second
Cell
LDO
MSP430
Microcontroller
PWM
Transient
M
Cell
Balance
Voltage
Sensing
TPS7A16
Comparator
Microcontroller
Sensing
+
-
UART
Up To 42 V
TPS7A16
SBVS171D –DECEMBER 2011–REVISED JANUARY 2014 www.ti.com
Figure 16. Protection Based on Low-Power Microcontroller Power from Multicell Battery Packs
BATTERY-OPERATED POWER TOOLS
High voltage multicell battery packs support high-power applications, such as power tools, with high current drain
when in use, highly intermittent use cycles, and physical separation between battery and motor.
In these applications, a microcontroller or microprocessor controls the motor. This microcontroller must be
powered with a low-voltage rail coming from the high-voltage, multicell battery pack; as mentioned previously,
powering this microcontroller or microprocessor from an intermediate voltage from the multicell array causes
battery-pack life degradation or added system complexity because of cell balancing issues. In addition, this
microcontroller or microprocessor must be protected from the high-voltage transients because of the motor
inductance.
The TPS7A16 can be used to power the motor-controlled microcontroller or microprocessor; its low quiescent
current maximizes battery shelf life and its very high-voltage capabilities simplify system complexity by replacing
voltage suppression filters, thus lowering system cost.
Figure 17. Low Power Microcontroller Power From Multi-cell Battery Packs In Power Tools
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