MIC4685 Datasheet, PDF (12/15 Pages) Micrel Semiconductor – 3A SPAK SuperSwitcher™ Buck Regulator

MIC4685
Micrel
Recommended Components for a Given Output Voltage (Bootstrap Configuration)
V_OUT I_OUT* R1
R2
5.0V 2.1A 3.01k 976Ω
3.3V 2.2A 3.01k 1.78k
2.5V 2.0A 3.01k 2.94k
1.8V 2.0A 3.01k 6.49k
V_IN
7.5V–16V
C1
47µF, 20V
Vishay-Dale
595D476X0020D2T
6.0V–16V 47µF, 20V
Vishay-Dale
595D476X0020D2T
5.0V–16V 47µF, 20V
Vishay-Dale
595D476X0020D2T
5.0V–16V 47µF, 20V
Vishay-Dale
595D476X0020D2T
D1
D2
L1
C4
3A, 30V 1A, 20V 39µH
330µF, 6.3V
Schottky Schottky Sumida
Vishay-Dale
B330A MBRX120 CDRH127R-390MC 594D337X06R3D2T
3A, 30V 1A, 20V 39µH
330µF, 6.3V
Schottky Schottky Sumida
Vishay-Dale
B330A MBRX120 CDRH127R-390MC 594D337X06R3D2T
3A, 30V 1A, 20V 39µH
330µF, 6.3V
Schottky Schottky Sumida
Vishay-Dale
B330A MBRX120 CDRH127R-390MC 594D337X06R3D2T
3A, 30V 1A, 20V 39µH
330µF, 6.3V
Schottky Schottky Sumida
Vishay-Dale
B330A MBRX120 CDRH127R-390MC 594D337X06R3D2T
* Maximum output current at minimum input voltage. See SOA curves for maximum output current vs. input voltage.
Table 1. Recommended Components for Common Ouput Voltages
D2
MBRX120
JP3 ^1A/20V
J1
L1
V_IN
U1 MIC4685BR
39µH
2 _IN
SW ⁶
C3
C1
47µF
C2
0.1µF
ON
50V
5 _EN
BS ¹
0.33µF
50V
R1
FB ³
20V
OFF
J3
GND
D1
GND
B330A
4, Tab
or
R2
SS33
* C4 can be used to provide additional stability
and improved transient response.
Note: optimized for 5V_OUT
Figure 3. Schematic Diagram
J2
V_OUT
C4*
optional
C5
330µF
6.3V
C7
0.1µF
50V
J4
GND
MIC4685
12
September 2002