0

10

20

30

40

50

60

70

80

90

100

0.1

1

10

100

1000

I

-OutputCurrent-mA

O

V

=5V

IN

V

=2.7V

IN

V

=3.6V

IN

V

=4.2V

IN

MODE=GND,

V

=1.8V,

L =2.2 H(MIPSA25202R2),

C

=4.7 F

OUT

OUT

m

m

V

=3.3V

IN

V

=2.3V

IN

100

0

90

70

40

20

80

50

60

30

10

0.0001

0.001

0.01

0.1

10

1

I

-OutputCurrent- A

O

5V

4.2V

12V

8.4V

V

=3.3V

T

PFMMode

O

o

www.ti.com

Bill of Materials

4.1

Test Result

The start-up waveform Figure 3 specifies the sequencing order that is required.

Figure 3. Sequencing in Start-up Waveform

Figure 4. Efficiency vs Output Current

Figure 5. Efficiency vs Output Current

7

SLVA339A – June 2009 – Revised May 2010

High-Vin, High-Efficiency Power Solution Using DC/DC Converters With DVFS

Copyright © 2009–2010, Texas Instruments Incorporated