Boosterpack Operation; Table 3-1. Connected Boosterpack Header Pins On Tps272C45Evm - Texas Instruments TPS272C45 User Manual

BoosterPack Operation

3 BoosterPack Operation
While the TPS272C45EVM can be used as a standalone evaluation board without the need of any external
microcontroller, the EVM also comes populated with
interface with a Texas Instruments microcontroller. The 40-pin headers of the BoosterPack headers are used,
however all signals can be accessed using headers J1 and J2 enabling use with the 20-pin header. Additionally
by populating jumper J19 the user has the ability to power the underlying LaunchPad through the integrated
3.3-V LDO on the TPS272C45EVM. A list of pins connected to the BoosterPack header can be seen below in
Table 3-1:

Table 3-1. Connected BoosterPack Header Pins on TPS272C45EVM

BoosterPack Pin
J1-1 3.3-V power rail
J1-2 Current sensing through the SNS pin
J1-5 DIA_EN pin used to enable diagnostics
SEL pin used to change measurement reported on
J1-8
SNS pin
J2-11 LATCH pin used to change fault behavior
ILIM1 pin used to enable a10-kΩ resistor R13 for
J2-12
ILIM1
ILIM2 pin used to enable a 4.99-kΩ resistor R14 for
J2-13
ILIM1
J2-17 FLT pin used to detect faults
J2-18 EN2 to enable VOUT2
J2-19 EN1 to enable VOUT1
J2-20 Module GND
Note that for all IO and analog signals being attached to the BoosterPack, the relevant 4.7-kΩ protection
resistors are populated in series with the pin.
To power the attached LaunchPad from the on-board LDO of the TPS272C45EVM, connect the jumper J19.
Note that this feeds the output of the 3.3-V LDO on the TPS272C45EVM into the 3.3-V rail on the LaunchPad.
If there is another power supply trying to power the LaunchPad (such as the integrated USB power on the
LaunchPad itself) this can potentially cause issues with the separate power sources fighting for contention.
Jumpers J8 through J12 are used to manually configure the control signals going into the TPS272C45.
When using a microcontroller to control these signals these jumpers must be unpopulated to allow for the
microcontroller to drive them high or low. Additionally the header labeled J18 can be used to configure how
the FAULT pin is pulled up. This pin is an open drain output used to report faults on the TPS272C45 such as
overcurrent or open load. If J18 is connected to the pin marked BP on the silkscreen the FAULT pin is pulled
up through the 1-kΩ resistor R9 to the 3.3-V rail of the BoosterPack. Similarly if the jumper labeled J17 is
connected to the BP pin the Vdd rail of the TPS272C45 is connected to the 3.3-V rail of the BoosterPack. If J17
is populated to be fed from the LDO or BoosterPack, it cannot be supplied externally from the J6 banana jack.
Note that one useful feature of the TPS272C45 EVM is the ability to sense the from the SNS pin of the
TPS272C45 through the analog input of the microcontroller attached to the BoosterPack headers. A 1.0-kΩ
resistor is connected to convert the current coming out of the SNS pin to a voltage, however care must be
given to ensure that this value does not violate the input maximum of the microcontroller's analog input. To
mitigate, a Zener diode can be soldered to D7 (do not populate by default) to regulate the voltage going into the
microncontroller's analog input.
4 TPS272C45 Evaluation Module
BoosterPack headers
Function
Copyright © 2021 Texas Instruments Incorporated
(J1, J2, J3, J4) to enable easy
Note
Disconnect J19 if powering LaunchPad via USB.
Populate a Zener diode on D7 if it is required to limit analog
signal of pin
Can be used to multiplex multiple TPS272C45 switches to one
analog pin
Active high. Do not enable at same time as J2-13.
Active high. Do not enable as same time as J2-12.
Open drain input. Pull-up source can be controlled using
jumper J18.
Active high. Can be connected to PWM.
Active high. Can be connected to PWM.
Do not connect to IC ground if ground network is used
SLVUBV4A – DECEMBER 2020 – REVISED DECEMBER 2021
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