TPS65982ABZBHR datasheet(44/121 Pages) TI1

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5 A

RSENSE

10 mΩ ± 1%

NMOS

HV Gate Control and Sense

PP_EXT

TPS65982

SLVSD02D – MARCH 2015 – REVISED JUNE 2019

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be used to source current from PP_HV to VBUS when the TPS65982 is acting as a power source and the

external path may be used to sink current from VBUS to PP_EXT to charge a battery when the TPS65982 is

acting as a sink. The internal and external paths must never be used in parallel to source current at the same

time or sink current at the same time. The current limiting function will not function properly in this case and may

become unstable.

9.3.3.11 External HV Power Switch as a Source with RSENSE

Figure 20 shows the configuration when the TPS65982 is acting as a source for the external switch path. The

external FETs must be connected in a common-drain configuration and will not work in a common source

configuration. In this mode, current is sourced to VBUS. RSENSE provides an accurate current measurement

and is used to initiate the current limiting feature of the external power path. The voltage between SENSEP

(PP_EXT) and SENSEN (VBUS) is sensed to block reverse current flow. This measurement is also digitally

readable via the ADC.

9.3.3.12 External HV Power Switch as a Sink with RSENSE

Figure 29 shows the configuration when the TPS65982 is acting as a sink for the external switch path with

RSENSE used to sense current. Acting as a sink, the voltage between SENSEP (VBUS) and SENSEN

(PP_EXT) is sensed to provide an accurate current measurement and initiate the current limiting feature of the

external power path. This measurement is also digitally readable via the ADC.

Figure 29. External HV Switch as a Sink with RSENSE

9.3.3.13 External HV Power Switch as a Sink without RSENSE

Figure 30 shows the configuration when the TPS65982 is acting as a sink for the external switch path without an

RSENSE resistor. In this mode, current is sunk from VBUS to an internal system power node, referred to as

PP_EXT. This is used for charging a battery or for providing a supply voltage for a bus-powered device. To block

reverse current, the VBUS and SENSEP pins monitor the voltage across the NFETs. To ensure that SENSEN

does not float, tie SENSEP to SENSEN in this configuration. When configured in this mode, the digital readout

from current from the ADC will be approximately zero.

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