TPS65982ABZBHR datasheet(91/121 Pages) TI1

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TPS65982

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SLVSD02D – MARCH 2015 – REVISED JUNE 2019

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11 Power Supply Recommendations

11.1 3.3-V Power

11.1.1 VIN_3V3 Input Switch

The VIN_3V3 input is the main supply to the TPS65982. The VIN_3V3 switch (S1 in Figure 49) is a unidirectional

switch from VIN_3V3 to LDO_3V3, not allowing current to flow backwards from LDO_3V3 to VIN_3V3. This

switch is on when 3.3 V is available. See Table 18 for the recommended external capacitance on the VIN_3V3

pin.

11.1.2 VOUT_3V3 Output Switch

The VOUT_3V3 output switch (S2 in Figure 49) enables a low-current auxiliary supply to an external element.

This switch is controlled by and is off by default. The VOUT_3V3 output has a supervisory circuit that drives the

RESETZ output as a POR signal to external elements. RESETZ is also asserted by the MRESET pin or a host

controller. See RESETZ and MRESET for more details on RESETZ. See Table 18 for the recommended external

capacitance on the VOUT_3V3 pin.

11.1.3 VBUS 3.3-V LDO

The 3.3-V LDO from VBUS steps down voltage from VBUS to LDO_3V3. This allows the TPS65982 to be

powered from VBUS when VIN_3V3 is not available. This LDO steps down any recommended voltage on the

VBUS pin. When VBUS is 20 V, as is allowable by USB PD, the internal circuitry of the TPS65982 will operate

without triggering thermal shutdown; however, a significant external load on the LDO_3V3 pin may increase

temperature enough to trigger thermal shutdown. The VBUS 3.3-V LDO blocks reverse current from LDO_3V3

back to VBUS allowing VBUS to be unpowered when LDO_3V3 is driven from another source. See Table 18 for

the recommended external capacitance on the VBUS and LDO_3V3 pins.

11.2 1.8 V Core Power

Internal circuitry is powered from 1.8 V. There are two LDOs that step the voltage down from LDO_3V3 to 1.8 V.

One LDO powers the internal digital circuits. The other LDO powers internal low voltage analog circuits.

11.2.1 1.8 V Digital LDO

The 1.8 V Digital LDO provides power to all internal low voltage digital circuits. This includes the digital core,

memory, and other digital circuits. See Table 18 for the recommended external capacitance on the LDO_1V8D

pin.

11.2.2 1.8 V Analog LDO

The 1.8 V Analog LDO provides power to all internal low voltage analog circuits. See Table 18 for the

recommended external capacitance on the LDO_1V8A pin.

11.3 VDDIO

The VDDIO pin provides a secondary input allowing some I/Os to be powered by a source other than LDO_3V3.

The default state is power from LDO_3V3. The memory stored in the flash will configure the I/O’s to use

LDO_3V3 or VDDIO as a source and application code will automatically scale the input and output voltage

thresholds of the I/O buffer accordingly. See I/O Buffers for more information on the I/O buffer circuitry. See

Table 18 for the recommended external capacitance on the VDDIO pin.

11.3.1 Recommended Supply Load Capacitance

Table 18 lists the recommended board capacitances for the various supplies. The typical capacitance is the

nominally rated capacitance that must be placed on the board as close to the pin as possible. The maximum

capacitance must not be exceeded on pins for which it is specified. The minimum capacitance is minimum

capacitance allowing for tolerances and voltage de-rating ensuring proper operation.

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