mic4684 Micrel Semiconductor, mic4684 Datasheet - Page 12

• Manufacturer Part Number: mic4684
• Description: Mic4684 2a High-efficiency Buck Regulator
• Manufacturer: Micrel Semiconductor

MIC4684
Recommended Components for a Given Output Voltage (Feed-Forward Configuration)
V
Note 1.
M9999-021705
V
5.0V
3.3V
2.5V
1.8V
IN
OUT
= 4V to 16V (in feed-forward configuration)
I
1.6A
1.7A
1.8A
This bill of materials assumes the use of feedforward schotty diode from V
OUT
2A
4V to +16V
GND
V
J1
J3
IN
15µF
3.01k 976kΩ
3.01k
3.01k
3.01k
35V
R1
C1
* C3 can be used to provide additional stability
and improved transient response.
Note: optimized for 5V
1.78k
2.94k
6.49k
R2
OFF
ON
Table 1. Recommended Components for Common Ouput Voltages
Figure 6. 4V - 16V Input Evaluation Board Schematic Diagram
Vishay-Dale Schottky
4.85V–16V 47µF, 20V
6.5V–16V 47µF, 20V
4.5V–16V 47µF, 20V
4.2V–16V 47µF, 20V
0.1µF
50V
C2
V
IN
OUT
3
8
SOP-8
VIN
EN
MBRX120
U1 MIC4684BM
C
Vishay-Dale
595D476X0020D2T
Vishay-Dale
595D476X0020D2T
595D476X0020D2T
Vishay-Dale
595D476X0020D2T
1A/20V
IN
D2
GND
2, 6, 7
SW
BS
FB
(V
1
4
5
IN
= 4V to 16V)
D1
B340A
or
SS34
C6
0.33µF
50V
12
47µH
L1
D1
2A, 30V
Schottky Schottky
SS23
2A, 30V
Schottky Schottky
SS23
2A, 30V
Schottky Sumida
SS23
2A, 30V
Schottky Schottky
SS23
IN
to the bootstrap pin.
1
2
D2
1A, 20V
MBRX120 CDH74-270MC
1A, 20V
MBRX120 CDH74-270MC
1A, 20V
MBRX120 CDH74-270MC
1A, 20V
MBRX120 CDH74-270MC
R1
3.01k
R2
6.49k
JP1a
1.8V
3
4
R3
2.94k
JP1b
2.5V
C3*
optional
5
6
L1
27µH
Sumida
27µH
Sumida
27µH
Vishay-Dale
27µH
Sumida
R4
1.78k
JP1c
3.3V
7
8
R5
976Ω
JP1d
5.0V
C4
330µF
6.3V
C
120µF, 6.3V
Vishay-Dale
594D127X06R3C2T
220µF, 6.3V
Vishay-Dale
594D227X06R3C2T
330µF, 6.3V
594D337X06R3D2T
330µF, 6.3V
Vishay-Dale
594D337X06R3D2T
OUT
V
GND
C5
0.1µF
50V
February 2005
J2
2A
J4
OUT
Micrel, Inc