Buck Converter Design Values

bhuvanb

bhuvanb

find me inductor and resistor values for 5V to 3.3V conversion using a buck converter

flux

To size the inductor and set the feedback divider for 5 V → 3.3 V, I need a few missing parameters:
  1. Which buck‐regulator IC (and its reference voltage, VREF) are you targeting?
  2. What switching frequency (ƒSW) will you run at?
  3. What’s your maximum load current (I OUT)?
  4. What percentage ripple current (ΔIL/IOUT) would you like—typically 20–40%?
With those, I can compute:
  • L = (VIN–VOUT)·VOUT / (ΔIL·VIN·ƒSW)
  • RTOP/RBOT = VOUT/VREF – 1 (choose RBOT ≈ 10 kΩ)
Let me know those details and I’ll crunch the values.
Provide IC parameters
Use MP2307DN specs
Request IC suggestion
Clarify ripple percentage
C20
Capacitance
0.1uF
C59
Capacitance
0.1uF
C30
Capacitance
47nF
C34
Capacitance
0.1uF
C73
Capacitance
1000pF
C60
Capacitance
0.1uF
C33
Capacitance
0.1uF
C40
Capacitance
4.7uF
C98
Capacitance
33nF
C53
Capacitance
0.1uF
C95
Capacitance
39nF
C52
Capacitance
100pF
C62
Capacitance
4.7uF
C23
Capacitance
0.1uF
C77
Capacitance
4.7uF
C2
Capacitance
0.1uF
C55
Capacitance
0.1uF
C39
Capacitance
4.7uF
C91
Capacitance
0.1uF
C79
Capacitance
4.7uF
C15
Capacitance
0.1uF
C90
Capacitance
0.1uF
C74
Capacitance
4.7uF
C26
Capacitance
0.1uF
C61
Capacitance
4.7uF
C58
Capacitance
0.01uF
C76
Capacitance
4.7pF
C37
Capacitance
0.1uF
C21
Capacitance
0.022uF
C87
Capacitance
0.01uF
C97
Capacitance
47nF
C9
Capacitance
220nF
C106
Capacitance
1000pF
C104
Capacitance
1000pF
C105
Capacitance
1000pF
C65
Capacitance
0.1uF
C6
Capacitance
18pF
C16
Capacitance
8200pF
C49
Capacitance
0.1uF
C47
Capacitance
2200pF
C96
Capacitance
39nF
C4
Capacitance
0.1uF
C83
Capacitance
0.1uF
C29
Capacitance
47nF
C28
Capacitance
47nF
C75
Capacitance
4.7uF
C102
Capacitance
1000pF
C82
Capacitance
100pF
C24
Capacitance
0.1uF
C107
Capacitance
1000pF
C31
Capacitance
47nF
C32
Capacitance
68nF
C46
Capacitance
0.1uF
C92
Capacitance
0.1uF
C43
Capacitance
0.1uF
C78
Capacitance
0.1uF
C57
Capacitance
0.1uF
C103
Capacitance
1000pF
C5
Capacitance
15pF
C18
Capacitance
0.1uF
C1
Capacitance
0.1uF
C56
Capacitance
0.1uF
C50
Capacitance
0.1uF
C45
Capacitance
0.1uF
C35
Capacitance
0.1uF
C36
Capacitance
0.1uF
C93
Capacitance
0.1uF
C27
Capacitance
0.1uF
C51
Capacitance
1000pF
C7
Capacitance
18pF
C44
Capacitance
0.1uF
C14
Capacitance
0.1uF
C94
Capacitance
22pF
C85
Capacitance
47nF
C38
Capacitance
0.01uF
C17
Capacitance
0.1uF
C22
Capacitance
0.1uF
C19
Capacitance
0.1uF
C86
Capacitance
1uF
C8
Capacitance
22pF
C88
Capacitance
4.7uF
C81
Capacitance
4.7uF
C10
Capacitance
0.1uF
C25
Capacitance
0.1uF
C80
Capacitance
0.1uF
C99
Capacitance
0.1uF
C13
Capacitance
0.1uF
C12
Capacitance
0.1uF
C54
Capacitance
0.1uF
C84
Capacitance
4.7uF
C11
Capacitance
0.1uF
R44
Resistance
1.50kΩ
R66
Resistance
62 Ω
R20
Resistance
10KΩ
R1
Resistance
2K20 Ω
R45
Resistance
1.50kΩ
R14
Resistance
80K6 Ω
R29
Resistance
1.02KΩ
R51
Resistance
10KΩ
R28
Resistance
63K4 Ω
R65
Resistance
62 Ω
R27
Resistance
4.99KΩ
R16
Resistance
47KΩ
R47
Resistance
10kΩ
R25
Resistance
1.05KΩ
R10
Resistance
47KΩ
R37
Resistance
30KΩ
R26
Resistance
10KΩ
R12
Resistance
100 Ω
R2
Resistance
162 Ω
R35
Resistance
0 Ω
R11
Resistance
100 Ω
R67
Resistance
47KΩ
R68
Resistance
47KΩ
R50
Resistance
1MΩ
R4
Resistance
100 Ω
R46
Resistance
31.6KΩ
R53
Resistance
162 Ω
R17
Resistance
4K99 Ω
R54
Resistance
365 Ω
R15
Resistance
47KΩ
R52
Resistance
0 Ω
R9
Resistance
931 Ω
R24
Resistance
100 Ω
R41
Resistance
86K6 Ω
R8
Resistance
100 Ω
R18
Resistance
931 Ω
R7
Resistance
100 Ω
R48
Resistance
1.50kΩ
R23
Resistance
17.4KΩ
R6
Resistance
100 Ω
R38
Resistance
10KΩ
R49
Resistance
18MΩ
R5
Resistance
4K99 Ω
R34
Resistance
10KΩ
R30
Resistance
100 Ω
R3
Resistance
162 Ω
R39
Resistance
121KΩ
R21
Resistance
365 Ω
R32
Resistance
30KΩ
R55
Resistance
365 Ω
R40
Resistance
10KΩ
R19
Resistance
1.05KΩ
R56
Resistance
23K7 Ω
R22
Resistance
432KΩ
R58
Resistance
162 Ω
R59
Resistance
0 Ω
R33
Resistance
1.05KΩ
R36
Resistance
1.05KΩ
R13
Resistance
47KΩ
R31
Resistance
1.02KΩ
R57
Resistance
365 Ω
R43
Resistance
100 Ω
D15
TP17
U7
J2
TP22
D20
TP23
TP21
TP8
TP6
D14
TP7
TP9
D13
TP19
D16
TP4
TP13
TP14
TP5
TP1
TP15
TP11
D19
TP20
TP12
TP18
TP16
TP2
D17
TP10
TP3
U4
Manufacturer Part Number
JS28F320J3D75A
U19
U14
Y2
Frequency
20MHz
U10
L6
D4
D10
D9
D8
D11
Q3
D12
F1
C41
Capacitance
150uF
L4
Inductance
10uH
J5
U11
End of Life
U8
Manufacturer Part Number
CY7C1041CV33-10ZSXA
L5
Inductance
4.7uH
C69
Capacitance
150uF
C48
Capacitance
22uF
Q2
C70
Capacitance
150uF
L3
Inductance
10uH
C42
Capacitance
150uF
F2
U9
Manufacturer Part Number
CY7C1041CV33-10ZSXA
U5
Manufacturer Part Number
CY7C1041CV33-10ZSXA
U6
Manufacturer Part Number
CY7C1041CV33-10ZSXA
L2
Inductance
22uH
L1
Inductance
4.7uH
C63
Capacitance
22uF
D3
U13
J3
C110
Capacitance
4.7uF
D2
U16
D1
C3
Capacitance
4.7uF
C109
Capacitance
4.7uF
D5
D7
D6
Y1
Frequency
32.768kHz
D18
U1
Q4
U2
Manufacturer Part Number
AD5290YRMZ100-R7
U18
U15
U20
End of Life
J1
J6
S1
U3
Manufacturer Part Number
AD5161BRMZ10
W1
Q5
U17
RP1
Resistance
47kΩ
RP2
Resistance
47kΩ

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