February 2012 R1.0
Page 5 of 8
Enpirion 2012 all rights reserved, E&OE
www.enpirion.com
Test Recommendations
Recommendations
To guarantee measurement accuracy, the following precautions should be observed:
Make all input and output voltage measurements at the board using the test points provided.
This will eliminate voltage drop across the line and load cables that can produce false
readings.
Measure input and output current with series ammeters or accurate shunt resistors. This is
especially important when measuring efficiency.
Use a balanced impedance probe tip across C
OUT
to measure V
OUT
Ripple to avoid noise
coupling into the probe ground lead. The recommended probe configuration is shown in Figure
3.
Figure 3. Recommended probe configuration.
Typical Performance Characteristics
0
10
20
30
40
50
60
70
80
90
100
0
0.5
1
1.5
2
2.5
3
E
F
F
IC
IE
N
C
Y
(
%
)
OUTPUT CURRENT (A)
Efficiency vs. Output Current
VOUT = 3.3V
VOUT = 2.5V
VOUT = 1.8V
VOUT = 1.2V
CONDITIONS
VIN = 5V
0
10
20
30
40
50
60
70
80
90
100
0
0.5
1
1.5
2
2.5
3
E
F
F
IC
IE
N
C
Y
(
%
)
OUTPUT CURRENT (A)
Efficiency vs. Output Current
VOUT = 2.5V
VOUT = 1.8V
VOUT = 1.2V
CONDITIONS
VIN = 3.3V
