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TPSM84A21

SLVSDF7A – DECEMBER 2016 – REVISED JULY 2017

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7.3.2 Input and Output Capacitance

The TPSM84A21 requires no external input or output capacitance to operate. Internal to the TPSM84A21 there is

66.1 µF (nominal) of ceramic input capacitance. Additionally, internal to the TPSM84A21 there is 185 µF

(nominal) of ceramic output capacitance.

Applications requiring additional ripple voltage reduction should add ceramic input and output capacitors directly

at the VIN and VOUT pins of the device. Applications requiring improved transient response can also benefit by

adding additonal ceramic or low-ESR bulk output capacitance. See the Capacitance section of the Electrical

Characteristics table for more information when adding external input and output capacitors.

7.3.3 Transient Response

The exceptional transient response of the TPSM84A21 allows many applications to operate with little or no

additional output capacitance. Figure 11 through Figure 14 show typical transient waveforms for the

TPSM84A21.

7.3.3.1 Transient Response Waveforms

VIN = 12 V

VOUT = 0.8 V

Load Step = 5 A

COUT = 0 µF

Slew Rate = 1 A/µs

Figure 11. Transient Response

VIN = 12 V

VOUT = 0.8 V

Load Step = 5 A

COUT = 300 µF

Slew Rate = 5 A/µs

Figure 12. Transient Response

VIN = 12 V

VOUT = 1.0 V

Load Step = 5 A

COUT = 0 µF

Slew Rate = 1 A/µs

Figure 13. Transient Response

VIN = 12 V

VOUT = 1.0 V

Load Step = 5 A

COUT = 100 µF

Slew Rate = 5 A/µs

Figure 14. Transient Response