MIC4684_10 Datasheet, PDF (12/16 Pages) Micrel Semiconductor – 2A High-Efficiency SuperSwitcher Buck Regulator

Micrel, Inc.
MIC4684
Recommended Components for a Given Output Voltage (Feed-Forward Configuration)
V_IN = 4V to 16V (in feed-forward configuration)
V_OUT I_OUT R1
R2
V_IN
5.0V 1.6A 3.01k 976kΩ 6.5V–16V


C_IN
47µF, 20V
Vishay-Dale
595D476X0020D2T
3.3V 1.7A 3.01k 1.78k 4.85V–16V 47µF, 20V

Vishay-Dale

595D476X0020D2T
2.5V 1.8A 3.01k 2.94k 4.5V–16V 47µF, 20V
Vishay-Dale Schottky

595D476X0020D2T
1.8V 2A 3.01k 6.49k 4.2V–16V 47µF, 20V

Vishay-Dale

595D476X0020D2T
D1
2A, 30V
Schottky
SS23
2A, 30V
Schottky
SS23
2A, 30V
Schottky
SS23
2A, 30V
Schottky
SS23
D2
L1
1A, 20V 27µH
Schottky Sumida
MBRX120 CDH74-270MC
1A, 20V 27µH
Schottky Sumida
MBRX120 CDH74-270MC
1A, 20V 27µH
Sumida Vishay-Dale
MBRX120 CDH74-270MC
1A, 20V 27µH
Schottky Sumida
MBRX120 CDH74-270MC
Note 1. This bill of materials assumes the use of feedforward schotty diode from V_IN to the bootstrap pin.
Table 1.  Recommended Components for Common Ouput Voltages
(V_IN = 4V to 16V)
C_OUT
120µF, 6.3V
Vishay-Dale
594D127X06R3C2T
220µF, 6.3V
Vishay-Dale
594D227X06R3C2T
330µF, 6.3V
594D337X06R3D2T
330µF, 6.3V
Vishay-Dale
594D337X06R3D2T
J1
V_IN
4V to +16V
C1
15µF
35V
J3
GND
D2
MBRX120
1A/20V
U1 MIC4684BM
L1
47µH
3 _VIN
SW ¹
C6
C2
0.1µF
BS ⁴
0.33µF
50V
ON
50V
8 _EN
FB ⁵
OFF
D1
GND
B340A
SOP-8
2, 6, 7
or
SS34
* C3 can be used to provide additional stability
and improved transient response.
Note: optimized for 5V_OUT
J2
V_OUT
2A
R1
3.01k
C3*
optional
R2
R3
R4
R5
6.49k 2.94k 1.78k 976Ω
1
3
5
7
JP1a JP1b JP1c JP1d
1.8V 2.5V 3.3V 5.0V
2
4
6
8
C4
330µF
6.3V
C5
0.1µF
50V
J4
GND
Figure 6.  4V - 16V Input Evaluation Board Schematic Diagram
January 2010
12
M9999-012610