MIC2178_05 Datasheet, PDF (13/15 Pages) Micrel Semiconductor – 2.5A Synchronous Buck Regulator

MIC2178
Micrel, Inc.
V_IN
12.5V to 16.5V
C1
22µF
35V
R1
20k
Skip Mode
PWM Mode
U1
1,2,9
VIN
20 _EN
3,8
SW
11 _PWRGD
4–7
10
MIC2178
PWM
PGND
18 _SYNC
FB ¹²
COMP SGND BIAS
13
R2
10k
C4
6.8nF
14–17
19
C3
0.01µF
L1
68µH
D1
MBRS130L
R3
10k
R2
174k
1%
V_OUT
12V/1A
C2
68µF
20V
U1 Micrel MIC2178BWM
C1 AVX
TPSE226M035R0300, ESR = 0.3Ω
R1 C2 AVX
TPSE686M020R0150, ESR = 0.15Ω
20k C3 Z5UorX7R Ceramic Dielectric Material
1% C4 X7RorNP0 Ceramic Dielectric Material
D1 Motorola MBRS130LT3
L1 Coiltronics CTX68-4P, DCR = 0.238 Ω
L1 Coilcraft DO3316P-683, DCR = 0.016Ω
L1 Bi
HM77-11003, DCR = 0.233Ω
Figure 3. MIC2178 12.5V–16.5V to 12V/1A Regulator
V_IN
10V to 16.5V
C1
22µF
35V
X2
R1
20k
Skip Mode
PWM Mode
U1
1,2,9
VIN
20 _EN
3,8
SW
11 _PWRGD
4–7
10
MIC2178
PWM
PGND
18 _SYNC
FB ¹²
COMP SGND BIAS
13
R2
10k
C4
6.8nF
14–17
19
C3
0.01µF
L1
33µH
D1
MBRS130L
V_OUT
3.3V/2.5A
C2
220µF
10V
X2
U1 Micrel MIC2178-3.3BWM
C1 AVX
TPSE226M035R0300, ESR = 0.3Ω
C2 AVX
TPSE227M010R0100, ESR = 0.1Ω
C3 Z5UorX7R Ceramic Dielectric Material
R3
10k
C4 X7RorNP0 Ceramic Dielectric Material
D1 Motorola MBRS130LT3
L1 Bi
HM77-18004, DCR = 0.075Ω
Figure 4. MIC2178 10V–16.5V to 3.3V/2.5A Regulator
V_IN
4.5V to 10V
C1
22µF
35V
R1
20k
Skip Mode
PWM Mode
U1
1,2,9
VIN
20 _EN
3,8
SW
11 _PWRGD
4–7
10
MIC2178
PWM
PGND
18 _SYNC
FB ¹²
COMP SGND BIAS
13
R2
10k
C4
6.8nF
14–17
19
C3
0.01µF
L1
33µH
D1
MBRS130L
V_OUT
3.3V/1A
C2
100µF
10V
U1 Micrel MIC2178-3.3BWM
C1 AVX
TPSE226M035R0300, ESR = 0.3Ω
C2 AVX
TPSD107M010R0100, ESR = 0.1Ω
C3 Z5UorX7R Ceramic Dielectric Material
R3
10k
C4 X7RorNP0 Ceramic Dielectric Material
D1 Motorola MBRS130LT3
L1 Coiltronics CTX33-3P, DCR = 0.077 Ω
L1 Coilcraft DO3316-333, DCR = 0.088Ω
L1 Bi
HM77-60002, DCR = 0.035Ω
Figure 5. MIC2178 4.5V–10V to 3.3V/1A Regulator
March 2005
13
M9999-031805