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MIC4680 Datasheet(PDF) 12 Page - Microchip Technology

Part # MIC4680
Description  1A 200 kHz SuperSwitcher??Buck Regulator
PDF  24 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MIC4680 Datasheet(HTML) 12 Page - Microchip Technology

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MIC4680
DS20006623A-page 12
2021 Microchip Technology Inc. and its subsidiaries
5.0
APPLICATIONS INFORMATION
5.1
Adjustable Regulators
Adjustable regulators require a 1.23V feedback signal.
Recommended voltage-divider resistor values for
common output voltages are included in Table 5-1.
For other voltages, the resistor values can be
determined using the following formulas.
EQUATION 5-1:
EQUATION 5-2:
VOUT VREF R1
R2
------- 1
+
=
R1
R2
VOUT
VREF
------------- 1
–
=
R2
R1
VOUT VREF
1
–
----------------------------------------
=
Where:
VREF = 1.23V
SW
L1
IN
FB
GND
C
N
D
H
S
OUT
R1
R2
D1
V
OUT
MIC4680YM
CIN
V
IN
SHUTDOWN
ENABLE
5–8
4
3
2
1
TABLE 5-1:
RECOMMENDED COMPONENTS FOR COMMON OUTPUT VOLTAGES
VOUT
R11 2
R21 2
CIN
D1
L1
COUT
1.8V
3.01 kΩ 6.495 kΩ
15 μF 35V
T495X156K035ATE
200
2A 60V Schottky
B260A
Vishay-Diode, Inc
or
SS26 General
Semiconductor
68 μH 1.5A
Coiltronics
UP2B-680
or
Sumida
CDRH125-680MC3
or
Sumida
CDRH124-680MC3
220 μF 10V
T495X227K010ATE
060
2.5V
3.01 kΩ 2.915 kΩ
3.3V
3.01 kΩ 1.788 kΩ
5.0V
3.01 kΩ
982Ω
6.0V
3.01 kΩ
776Ω
Note 1: All resistors 1%.
2: Nearest available resistor values.
3: Shielded magnetics for low-RFI applications.



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