Datasheet

LDO
C5
U2
D2
L2
R1
R2
EN
FB
SW
VINA
VIND
GND
V
O
= 3.3V @ 1.5A
V
O
= 5.0V @ 150mA
C4
C6
C2
C3
D1
L1
U1
C1
LM2831
V
IN
= 5V
LM2831
SNVS422C –AUGUST 2006–REVISED APRIL 2013 www.ti.com
LM2831X Buck Converter & Voltage Double Circuit with LDO Follower Design Example 9
Figure 36. LM2831X (1.6MHz): Vin = 5V, Vo = 3.3V @ 1.5A & LP2986-5.0 @ 150mA
Table 10. Bill of Materials
Part ID Part Value Manufacturer Part Number
U1 1.5A Buck Regulator TI LM2831X
U2 200mA LDO TI LP2986-5.0
C1, Input Cap 22µF, 6.3V, X5R TDK C3216X5ROJ226M
C2, Output Cap 22µF, 6.3V, X5R TDK C3216X5ROJ226M
C3 – C6 2.2µF, 6.3V, X5R TDK C1608X5R0J225M
D1, Catch Diode 0.3V
f
Schottky 1.5A, 30V
R
TOSHIBA CRS08
D2 0.4V
f
Schottky 20V
R
, 500mA ON Semi MBR0520
L2 10µH, 800mA CoilCraft ME3220-103
L1 3.3µH, 2.2A TDK VLCF5020T-3R3N2R0-1
R2 45.3kΩ, 1% Vishay CRCW08054532F
R1 10.0kΩ, 1% Vishay CRCW08051002F
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