8.3 System Examples

TPS61322xx can be easily shut down with an external switch Q1 as shown in Figure 8-20. The switch can be

mechanical switch, a P-channel MOSFET, or a PNP transistor. For a mechanical switch, there is no control logic

circuit needed to turn on or turn off the switch.

TPS6132xx

Battery

SW

VOUT

22 µF

2.2 µH

(optional for large current)

VOUT

C1

C2

L1

2.2 µF

Q1

D1

GND

Copyright © 2017, Texas Instruments Incorporated

Figure 8-20. True Shutdown for TPS61322xx

8.3.1 Detail Design Schematics

The Figure 8-21 shows the application circuit when the power supply of the micro controller unit (MCU) is not

less than the battery voltage. The Figure 8-22 shows the application circuit when the power supply of the micro

controller unit (MCU) is less than the battery voltage

TPS6132xx

Battery

SW

VOUT

22 µF

2.2 µH

(optional for large current)

VOUT

MCU

V_MCU

R1

C1

C2

L1

2.2 µF

GPIO

Q1

D1

GND

Copyright © 2017, Texas Instruments Incorporated

Figure 8-21. True Shutdown, V_MCU Voltage No

Less than Battery Voltage

TPS6132xx

Battery

SW

VOUT

22 µF

2.2 µH

(optional for large current)

VOUT

MCU

V_MCU

R1

C1

C2

L1

2.2 µF

GPIO

Q1

Q2

D1

GND

Copyright © 2017, Texas Instruments Incorporated

Figure 8-22. True Shutdown, V_MCU Voltage Less

than Battery Voltage

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TPS61322

SLVSDY5E – JANUARY 2018 – REVISED FEBRUARY 2024

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Product Folder Links: TPS61322