MIC2177-5.0BWM Micrel Inc, MIC2177-5.0BWM Datasheet - Page 14

• Manufacturer Part Number: MIC2177-5.0BWM
• Description: IC REG SYNCBUCK 2.5A 5.0V 20SOIC
• Manufacturer: Micrel Inc
• Type: Step-Down (Buck)r

Specifications of MIC2177-5.0BWM

• Internal Switch(s): Yes
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: 5V
• Current - Output: 2.5A
• Frequency - Switching: 200kHz
• Voltage - Input: 4.5 ~ 16.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 20-SOIC (7.5mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -

the MIC2177. A good design takes into consideration
component placement and routing of power traces.
The first thing to consider is the locations of the input
capacitor, inductor, output diode, and output capacitor.
The input capacitor must be placed very close to the V
pin, the inductor and output diode very close to the SW
pin, and the output capacitor near the inductor. These
components pass large high-frequency current pulses,
so they must use short, wide power traces. In addition,
their ground pins and PGND are connected to a ground
plane that is nearest the power supply ground bus.
Bill of Materials
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 92835
Tel: [phone]
Fax: [phone]
Micrel, Inc.
April 2008
4.5V to 16.5V
V
IN
C1
22µF
35V
0.01
C5
µF
Capacitors
AVX
801 17
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
60005 Lower Main St.
Sanford, ME 04073
Tel: [phone]
6.8nF
20
18
11
C4
U1
th
10k
EN
SYNC
AUTO
COMP
R4
Ave.
13
MIC2177
SGND
VIN
1,2,9
14–17
0.01µF
C3
PGND
BIAS
OUT
IN
SW
FB
19
10k
R4
10
12
3,8
4–7
14
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 56
Phoenix, AZ 85018
Tel: [phone]
Fax: [phone]
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
currents returning to the power supply ground bus.
SGND and PGND should be tied together by a ground
plane that extends under the MIC2177.
U1 Micrel
C1 AVX
C2 AVX
C3 Z5UorX7R Ceramic Dielectric Material
C4 X7RorNP0 Ceramic Dielectric Material
D1 Motorola
L1 Coiltronics CTX50-4P, DCR = 0.097
L1 Coilcraft
L1 Bi
D1
MBRS130L
L1, 50µH
th
St.
MIC2177-3.3BWM
MBRS130LT3
HM77-11003, DCR = 0.07 3
C2
100µF
10V
Transistors
Siliconix
2201 Laurelwood Rd.
Santa Clara, CA 96056
Tel: [phone]
V
3.3V/1A
OUT
M9999-042108
MIC2177