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2.5

Efficiency

0

10

20

30

40

50

60

70

80

90

100

0.001

0.01

0.1

1

10

I

-OutputCurrent- A

O

3

3.6

4.2

5

TPS63000,

PS=Low,

V

=3.3V

O

2.6

Power Dissipation

2.7

Load Transients

LOADI

VOUT100mV/div

Setup and Results

Efficiency of over 90% is common at mid-to-high loads. With power-save mode enabled, efficiency is

greater than 80% at light loads of 1 mA to 100 mA.

Figure 4. Efficiency Over Li-Ion Cell Range

With high efficiency, the power to be dissipated is low. Also, the QFN package with a solder pad is very

efficient at removing heat. In this case, with unit delivering 3.3 V at 550 mA and 90% efficiency, power

dissipation will be 180 mW. The package thermal resistance is about 50

°C/W, therefore the

case-to-junction temperature rise would be 9

°C. This would allow an ambient temperatire of 116°C, and

still hold the junction temperature below 125

°C.

Load transient response is well regulated. Additional output capacitance reduces voltage over- and

under-shoot.

Figure 5. Load Step 100 mA to 500 mA

SLVU156 – March 2006

TPS63000EVM-148

5

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