Data Sheet

AC4490
Datasheet
https://www.lairdconnect.com/
30
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15 APPENDIX II: SAMPLE POWER SUPPLY
Below is a simple switching power supply that provides enough current to easily power any Laird OEM module. It utilizes low
cost, off-the-shelf components that fit into a small area. This supply has an input voltage range of +6 volts to +18 volts and will
output +3.4 volts at 1.5 amps.
Included is a Bill of Materials with manufacturer’s name and part numbers, Schematic and a sample PCB Layout. It is
important to follow the layout suggestions and use large areas of copper to connect the devices as shown in the layout. It is
also important to hook up the ground traces as shown and use multiple vias to connect input and output capacitors to the
bottom side ground plane.
If the input voltage is less than 12 volts, C1 and C2 can be replaced with a single 100µF 20 volt capacitor (same part number
as C7). This will reduce board space and costs further. If you are powering an AC5124 module, R1 can be changed to a 373
ohm 1% resistor. This will change the output to +5 volts at 1.0 amps.
15.1 Bill of Materials
Table 10: Power Supply Bill of Materials
Qty
Reference
Value
Description
Mfg.
Mfg. Part number
1
R1
210
Res, 0603, 210, 1/16 W, 1%
KOA
RK73H1JT2100F
1
R2
127
Res, 0603, 127, 1/16 W, 1%
KOA
RK73H1JT1270F
2
C1 C2
47µF
Cap, Tant, 7343, 47 µF, 35 V
AVX
TPSE476M035R0200
3
C3 C4 C5
0.1µF
Cap, Cer, 0603, 0.1uF, Y5V, 25 V
Murata
GRM39Y5V104Z025AD
1
C6
3300pF
Cap, Cer, 0603, 3300 pF, X7R, 50 V
Murata
GRM39X7R332K050AD
1
C7
100µF
Cap, Tant, 7343, 100 µF, 20 V
Kemet
T491X107K020A5
1
D1
B230/A
Diode, SMB, B230/A, 2A, Schottkey
Diodes, Inc.
B230/A
1
D2
LL4148
Diode, MELF, LL4148, Switch Diode
Diodes, Inc.
LL4148
1
L1
15µH
Xfmr, 2P, SMT, 15uH, 2A
Coiltronics
UP2.8B150
1
U1
CS51413
IC, CS51413, 8P, SO, Switch Reg Ctrl.
On-Semicond.
CS51413