TPS65982ABZBHR datasheet(46/121 Pages) TI1

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BUSPOWERZ

ADC

LDO_3V3

LDO_1V8D

BUSPOWERZ

ADC

LDO_3V3

LDO_1V8D

BUSPOWERZ

ADC

LDO_3V3

LDO_1V8D

TPS65982

SLVSD02D – MARCH 2015 – REVISED JUNE 2019

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9.3.3.17 BUSPOWERZ

At power-up, when VIN_3V3 is not present and a dead-battery condition is supported as described in Dead-

Battery or No-Battery Support, the TPS65982 will appear as a USB Type-C sink (device) causing a connected

USB Type-C source (host) to provide 5 V on VBUS. The TPS65982 will power itself from the 5-V VBUS rail (see

Power Management) and execute boot code (see Boot Code). The boot code will observe the BUSPOWERZ

voltage, which will fall into one of three voltage ranges: VBPZ_DIS, VBPZ_HV, and VBPZ_EXT (defined in

BUSPOWERZ Configuration Characteristics). These three voltage ranges configure how the TPS65982 routes

the 5 V present on VBUS to the system in a dead-battery or no-battery scenario.

When the voltage on BUSPOWERZ is in the VBPZ_DIS range (when BUSPOWERZ is tied to LDO_3V3 as in

Figure 31), this indicates that the TPS65982 will not route the 5 V present on VBUS to the entire system. In this

case, the TPS65982 will load SPI-connected flash memory and execute this application code. This configuration

will disable both the PP_HV and PP_EXT high voltage switches and only use VBUS to power the TPS65982.

Figure 31. BUSPOWERZ Configured to Disable Power from VBUS

The BUSPOWERZ pin can alternately configure the TPS65982 to power the entire system through the PP_HV

internal load switch when the voltage on BUSPOWERZ is in the VBPZ_HV range (when BUSPOWERZ is tied to

LDO_1V8D as in Figure 32).

Figure 32. BUSPOWERZ Configured with PP_HV as Input Power Path

The BUSPOWERZ pin can also alternately configure the TPS65982 to power the entire system through the

PP_EXT external load switch when the voltage on BUSPOWERZ is in the VBPZ_EXT range (when

BUSPOWERZ is tied to GND as in Figure 33).

Figure 33. BUSPOWERZ Configured with PP_EXT as Input Power Path

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