Data Sheet
June 21, 2008
Austin Superlynx
TM
II SMT Non-isolated Power Modules:
2.4 – 5.5Vdc input; 0.75Vdc to 3.63Vdc Output; 16A output current
Test Configurations
TO OSCILLOSCOPE
L
TEST
1μH
V
IN
(+)
CURRENT PROBE
Design Considerations
Input Filtering
The Austin SuperLynx SMT module should be
connected to a low-impedance source. A highly inductive
source can affect the stability of the module. An input
capacitance must be placed directly adjacent to the input
pin of the module, to minimize input ripple voltage and
ensure module stability.
To minimize input voltage ripple, low-ESR polymer and
ceramic capacitors are recommended at the input of the
module. Figure 26 shows the input ripple voltage (mVp-
p) for various outputs with 1x150 µF polymer capacitors
(Panasonic p/n: EEFUE0J151R, Sanyo p/n: 6TPE150M)
in parallel with 1 x 47 µF ceramic capacitor (Panasonic
p/n: ECJ-5YB0J476M, Taiyo- Yuden p/n:
CEJMK432BJ476MMT) at full load. Figure 27 shows the
input ripple with 2x150 µF polymer capacitors in parallel
with 2 x 47 µF ceramic capacitor at full load.
400
TM
BATTERY
C
S
1000μF
Electrolytic
E.S.R.<0.1Ω
@ 20°C 100kHz
C
IN
2x100μF
Tantalum
COM
NOTE: Measure input reflected ripple current with a simulated
source inductance (L
TEST
) of 1μH. Capacitor C
S
offsets
possible battery impedance. Measure current as shown
above.
Figure 23. Input Reflected Ripple Current Test Setup.
COPPER STRIP
V
O
(+)
1uF
COM
.
10uF
SCOPE
RESISTIVE
LOAD
Input Ripple Voltage (mVp-p)
350
300
250
200
150
100
50
0
0
0.5
1
1.5
2
2.5
3
3.5
3.3Vin
5Vin
GROUND PLANE
NOTE: All voltage measurements to be taken at the module
terminals, as shown above. If sockets are used then
Kelvin connections are required at the module terminals
to avoid measurement errors due to socket contact
resistance.
Figure 24. Output Ripple and Noise Test Setup.
R
distribution
R
contact
V
IN
(+)
V
O
R
contact
R
distribution
Output Voltage (Vdc)
Figure 26. Input ripple voltage for various output
with 1x150 µF polymer and 1x47 µF ceramic
capacitors at the input (full load).
250
V
IN
V
O
R
LOAD
Input Ripple Voltage (mVp-p)
R
distribution
R
contact
COM
COM
R
contact
R
distribution
200
150
100
50
0
0
0.5
1
1.5
2
2.5
3
3.5
3.3Vin
5Vin
NOTE: All voltage measurements to be taken at the module
terminals, as shown above. If sockets are used then
Kelvin connections are required at the module terminals
to avoid measurement errors due to socket contact
resistance.
Figure 25. Output Voltage and Efficiency Test Setup.
V
O
. I
O
Efficiency
η
=
V
IN
. I
IN
x
100 %
Output Voltage (Vdc)
Figure 27. Input ripple voltage for various output
with 2x150 µF polymer and 2x47 µF ceramic
capacitors at the input (full load).
LINEAGE
POWER
10
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
