TPS54821 datasheet(29/42 Pages) TI2

29 / 42 page

= 2 V/div

OUT

= 10 A/div

OUT

Time = 20 ms/div

PH = 10 V/div

100

0.001

0.01

0.1

Output Current (A)

VIN = 8 V

VIN = 12 V

VIN = 17 V

G002

TPS54821

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SLVSB14B – OCTOBER 2011 – REVISED FEBRUARY 2016

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Figure 43. Efficiency vs Output Current

Figure 44. TPS54821 Hiccup Mode Current Limit

9 Power Supply Recommendations

The TPS54821 is designed to operate from an input voltage supply range between 4.5 V and 17 V. This supply

voltage must be well regulated. Power supplies must be well bypassed for proper electrical performance. This

includes a minimum of one 4.7

μF (after de-rating) ceramic capacitor, type X5R or better from PVIN to GND, and

from VIN to GND. Additional local ceramic bypass capacitance may be required in systems with small input ripple

specifications, in addition to bulk capacitance if the TPS54821 device is located more than a few inches away

from its input power supply. In systems with an auxiliary power rail available, the power stage input, PVIN, and

the analog power input, VIN, may operate from separate input supplies. See Figure 45 (layout recommendation)

for recommended bypass capacitor placement.

TPS54821 Datasheet(PDF) 29 Page - Texas Instruments