´

´

´

=

´

´

OUT

OUT

IN

OUT

Q

IN

IN

V

I

PD(out)

Efficiency(%) =

100 =

100 , I

2

I

+ I

PD(in)

V

I

(4)

(

)

OUT

IN

OUT

IN

V

Efficiency(%) =

× 100 I

= 2

I

Quiescent current was neglected.

2 × V

´

(5)

PCB LAYOUT

C2

TPS60150

The efficiency of the charge pump regulator varies with the output voltage, the applied input voltage and the load

current.

The approximate efficiency in normal operating mode is given by:

Large transient currents flow in the VIN, VOUT, and GND traces. To minimize both input and output ripple, keep

the capacitors as close as possible to the regulator using short, direct circuit traces.

Figure 26. Recommended PCB Layout

Copyright © 2008–2009, Texas Instruments Incorporated

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