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MIC2178BWM Datasheet(PDF) 12 Page - Micrel Semiconductor

Part # MIC2178BWM
Description  2.5A Synchronous Buck Regulator
PDF  16 Pages
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Manufacturer  MICREL [Micrel Semiconductor]
Direct Link  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MIC2178BWM Datasheet(HTML) 12 Page - Micrel Semiconductor

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MIC2178
Micrel
MIC2178
12
June 1998
The feedback resistors, RC compensation network, and
BIAS pin bypass capacitor should be located close to their
respective pins. To prevent ground bounce, their ground
traces and SGND should not be in the path of switching
BIAS
SGND
PWRGD
COMP
PGND
FB
SW
VIN
C2
100µF
10V
VOUT
3.3V/1A
L1
50µH
C4
6.8nF
C3
0.01µF
MIC2178
PWM
Skip Mode
PWM Mode
SYNC
EN
R1
20k
R2
10k
VIN
4.5V to 16.5V
C1
22µF
35V
U1
20
11
10
18
13
14–17
19
12
4–7
3,8
1,2,9
D1
MBRS130L
U1 Micrel
MIC2178-3.3BWM
C1 AVX
TPSE226M035R0300, ESR = 0.3
Ω
C2 AVX
TPSD107M010R0100, ESR = 0.1
Ω
C3 Z5UorX7R Ceramic Dielectric Material
C4 X7RorNP0 Ceramic Dielectric Material
D1 Motorola
MBRS130LT3
L1
Coiltronics CTX50-4P, DCR = 0.097
Ω
L1
Coilcraft
DO3316P-473, DCR = 0.12
Ω
L1
Bi
HM77-11003, DCR = 0.073
Ω
Figure 1. MIC2178 4.5V–16.5V to 3.3V/1A Regulator
BIAS
SGND
PWRGD
COMP
PGND
FB
SW
VIN
C2
100µF
10V
VOUT
5V/1A
L1
50µH
C4
6.8nF
C3
0.01µF
MIC2178
PWM
Skip Mode
PWM Mode
SYNC
EN
R1
20k
R2
10k
VIN
5.4V to 16.5V
C1
22µF
35V
U1
20
11
10
18
13
14–17
19
12
4–7
3,8
1,2,9
D1
MBRS130L
U1 Micrel
MIC2178-5.0BWM
C1 AVX
TPSE226M035R0300, ESR = 0.3
Ω
C2 AVX
TPSD107M010R0100, ESR = 0.1
Ω
C3 Z5UorX7R Ceramic Dielectric Material
C4 X7RorNP0 Ceramic Dielectric Material
D1 Motorola
MBRS130LT3
L1
Coiltronics CTX50-4P, DCR = 0.097
Ω
L1
Coilcraft
DO3316P-473, DCR = 0.12
Ω
L1
Bi
HM77-11003, DCR = 0.073
Ω
Figure 2. MIC2178 5.4V–16.5V to 5V/1A Regulator
currents returning to the power supply ground bus. SGND
and PGND should be tied together by a ground plane that
extends under the MIC2178.



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