MIC2178-3.3BWM Micrel Inc, MIC2178-3.3BWM Datasheet - Page 12

• Manufacturer Part Number: MIC2178-3.3BWM
• Description: IC REG SYNCBCK 2.5A 3.3V 20SOIC
• Manufacturer: Micrel Inc
• Type: Step-Down (Buck)r

Specifications of MIC2178-3.3BWM

• Internal Switch(s): Yes
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: 3.3V
• 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: -

MIC2178
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
M9999-031805
4.5V to 16.5V
5.4V to 16.5V
22µF
22µF
35V
V
V
35V
C1
PWM Mode
IN
IN
C1
PWM Mode
Skip Mode
Skip Mode
R1
20k
R1
20k
Figure 1. MIC2178 4.5V–16.5V to 3.3V/1A Regulator
Figure 2. MIC2178 5.4V–16.5V to 5V/1A Regulator
6.8nF
6.8nF
10
20
11
18
C4
10
20
11
18
10k
C4
R2
10k
U1
R2
EN
PWRGD
PWM
SYNC
U1
COMP
EN
PWRGD
PWM
SYNC
COMP
13
13
MIC2178
MIC2178
SGND
SGND
VIN
VIN
14–17
0.01µF
1,2,9
14–17
1,2,9
C3
PGND
PGND
BIAS
BIAS
SW
FB
SW
FB
19
19
C3
0.01µF
3,8
4–7
12
12
3,8
4–7
12
R3
10k
D1
MBRS130L
D1
MBRS130L
currents returning to the power supply ground bus. SGND
and PGND should be tied together by a ground plane that
extends under the MIC2178.
R3
10k
50µH
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 Ω
L1 Coilcraft
L1 Bi
50µH
L1
L1
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 Ω
L1 Coilcraft
L1 Bi
MIC2178-3.3BWM
TPSE226M035R0300, ESR = 0.3Ω
TPSD107M010R0100, ESR = 0.1Ω
MBRS130LT3
DO3316P-473, DCR = 0.12Ω
HM77-11003, DCR = 0.073Ω
MIC2178-5.0BWM
TPSE226M035R0300, ESR = 0.3Ω
TPSD107M010R0100, ESR = 0.1Ω
MBRS130LT3
DO3316P-473, DCR = 0.12Ω
HM77-11003, DCR = 0.073Ω
C2
100µF
10V
V
3.3V/1A
OUT
C2
100µF
10V
V
5V/1A
OUT
March 2005
Micrel, Inc.