Datasheet

LP3470M5X-3.08
U2
VINAVIND
LM2831
U3
U1
LM2831
SW
D1
FB
EN
L1
GND
C1
C2
R1
R2
C3
VINAVIND
SW
FB
EN
GND
D2
L2
C4
R4
R5
R6
3
1
2
V
IN
RESET
4
5
LP3470
C7
V
IN
V
O
= 3.3V @ 1.5A
V
O
= 1.2V @ 1.5A
R3
LM2831
www.ti.com SNVS422C –AUGUST 2006–REVISED APRIL 2013
LM2831X Dual Converters with Delayed Enabled Design Example 8
Figure 35. LM2831X (1.6MHz): Vin = 5V, Vo = 1.2V @ 1.5A & 3.3V @1.5A
Table 9. Bill of Materials
Part ID Part Value Manufacturer Part Number
U1, U2 1.5A Buck Regulator TI LM2831X
U3 Power on Reset TI LP3470M5X-3.08
C1, C3 Input Cap 22µF, 6.3V, X5R TDK C3216X5ROJ226M
C2, C4 Output Cap 2x22µF, 6.3V, X5R TDK C3216X5ROJ226M
C7 Trr delay capacitor TDK
D1, D2 Catch Diode 0.3V
f
Schottky 1.5A, 30V
R
TOSHIBA CRS08
L1, L2 3.3µH, 2.2A TDK VLCF5020T-3R3N2R0-1
R2, R4, R5 10.0kΩ, 1% Vishay CRCW08051002F
R1, R6 45.3kΩ, 1% Vishay CRCW08054532F
R3 100kΩ, 1% Vishay CRCW08051003F
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