MIC2177 Datasheet, PDF (12/16 Pages) Micrel Semiconductor – 2.5A Synchronous Buck Regulator

MIC2177
The feedback resistors, RC compensation network, and
BIAS pin bypass capacitor should be located near their
respective pins. To prevent ground bounce, their ground
traces and SGND should not be in the path of switching
Micrel
currents returning to the power supply ground bus. SGND
and PGND should be tied together by a ground plane that
extends under the MIC2177.
V_IN
4.5V to 16.5V
C1
22µF
35V
C5
0.01
µF
U1
1,2,9
VIN
10
OUT
20 _EN
3,8
SW
18 _{SYNC MIC2177}
11 _AUTO
4–7
PGND
L1, 50µH
D1
MBRS130L
V_OUT
3.3V/1A
C2
100µF
10V
12
FB
COMP SGND BIAS
U1 Micrel MIC2177-3.3BWM
13
R4
10k
C4
14–17 19
C1 AVX
C2 AVX
TPSE226M035R0300, ESR = 0.3Ω
TPSD107M010R0100, ESR = 0.1Ω
C3
0.01µF
C3
C4
D1
Z5UorX7R Ceramic Dielectric Material
X7RorNP0 Ceramic Dielectric Material
Motorola MBRS130LT3
6.8nF
L1 Coiltronics CTX50-4P, DCR = 0.097Ω
L1 Coilcraft DO3316P-473, DCR = 0.12Ω
L1 Bi
HM77-11003, DCR = 0.073Ω
Figure 1. MIC2177 4.5V–16.5V to 3.3/1A Regulator
Suggested Manufacturers List
Inductors
Coilcraft
1102 Silver Lake Rd.
Cary, IL 60013
tel: [phone]
fax: [phone]
Coiltronics
6000 Park of Commerce Blvd.
Boca Raton, FL 33487
tel: [phone]
fax: [phone]
Bi Technologies
4200 Bonita Place
Fullerton, CA
tel: [phone]
fax: [phone]
Capacitors
AVX Corp.
801 17th Ave. South
Myrtle Beach, SC 29577
tel: [phone]
fax: [phone]
Sanyo Video Components Corp.
2001 Sanyo Ave.
San Diego, CA 92173
tel: [phone]
fax: [phone]
Sprague Electric
Lower Main St.
60005 Sanford, ME 04073
tel: [phone]
Diodes
General Instruments (GI)
10 Melville Park Rd.
Melville, NY 11747
tel: [phone]
fax: [phone]
International Rectifier Corp.
233 Kansas St.
El Segundo, CA 90245
tel: [phone]
fax: [phone]
Motorola Inc.
MS 56-126
3102 North 56th St.
Phoenix, AZ 85018
tel: [phone]
fax: [phone]
Transistors
Siliconix
2201 Laurelwood Rd.
Santa Clara, CA 96056
tel: [phone]
MIC2177
12
April 1999