Datasheet
EFFICIENCY LAYOUT
Efficiency(%)=V /(2 V ) 100
(step-upoperatingmode)
or
(step-downoperatingmode)
OUT IN
´ ´
V
V
OUT
IN
´ 100
V
ENABLE
V
IN
C
IN
GND
C
P
V
OUT
C
OUT
AREA:<0.08sq.inches
REG710
SBAS221G – DECEMBER 2001 – REVISED JANUARY 2009 ...........................................................................................................................................
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The efficiency of the charge pump regulator varies Large transient currents flow in the V
IN
, V
OUT
, and
with the output voltage version, the applied input GND traces. To minimize both input and output
voltage, the load current, and the internal operation ripple, keep the capacitors as close as possible to the
mode of the device. regulator using short, direct circuit traces.
The approximate efficiency is given by: A suggested printed circuit board (PCB) routing is
shown in Figure 21 . The trace lengths from the input
and output capacitors have been kept as short as
possible.
Table 2 lists the approximate values of the input
voltage at which the device changes internal
operating mode. See efficiency curves in the Typical
Characteristics section for various loads and input
voltages.
Figure 21. Suggested PCB Design for Minimum
Ripple
Table 2. Operating Mode Change versus V
IN
OPERATING MODE
PRODUCT CHANGES AT V
IN
OF
REG710-2.5 > 3.2V
REG710-2.7 > 3.4V
REG710-3 > 3.7V
REG710-3.3 > 4.0V
REG710-5, REG71050,
Step-up only
REG71055
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