MIC4685WR Micrel Inc, MIC4685WR Datasheet - Page 14

• Manufacturer Part Number: MIC4685WR
• Description: IC REG BUCK 3A ADJ VOLT HE 7SPAK
• Manufacturer: Micrel Inc
• Series: SuperSwitcher™r
• Type: Step-Down (Buck)r

Specifications of MIC4685WR

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: Adj to 1.235V
• Current - Output: 3A
• Frequency - Switching: 200kHz
• Voltage - Input: 4 ~ 30 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: SPak-7
• Power - Output: 1.14W
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 576-1224

Recommended Components for a Given Output Voltage (Standard Configuration)
*
V
5.0V
3.3V
2.5V
1.8V
Micrel, Inc.
January 2010
OUT
Maximum output current at minimum input voltage. See SOA curves for maximum output current vs. Input voltage.
(34V transient)
2.35A
I
2.0A
2.4A
2.0A
OUT
* C4 can be used to provide additional stability
**
***
and improved transient response.
Note: optimized for 5V
GND
*
V
J1
J3
IN
33µF
C6 Optional
D2 is not used for standard configuration and JP3 is open.
35V
C1
3.01k
3.01k
3.01k
3.01k
R1
OFF
ON
976Ω
1.78k
2.94k
6.49k
R2
OUT
0.1µF
Table 2. Recommended Components for Common Output Voltages
50V
C2
8V – 30V
8V – 26V
7V – 23V
6V – 16V
V
IN
2
5
JP3
IN
EN
U1 MIC4685_R
Figure 4. Evaluation Board Schematic Diagram
GND
C1
33µF, 35V
Vishay-Dale
595D336X0035R2T
33µF, 35V
Vishay-Dale
595D336X0035R2T
33µF, 35V
Vishay-Dale
595D336X0035R2T
33µF, 35V
Vishay-Dale
595D336X0035R2T
D2***
B340
4, Tab
SW
BS
FB
6
1
3
D1
B340A
C3
0.33µF
50V
39µH
L1
D1
3A, 40V
Schottky
B340A-E3
3A, 40V
Schottky
B340A-E3
3A, 40V
Schottky
B340A-E3
3A, 40V
Schottky
+ Vishay
B340A-E3
14
1
2
R1
3.01k
R2
6.49k
JP1a
1.8V
L1
39µH
Sumida
CDRH127-390MC
39µH
Sumida
CDRH127-390MC
39µH
Sumida
CDRH127-390MC
39µH
Sumida
CDRH127-390MC
3
4
R3
2.94k
JP1b
2.5V
C4*
optional
5
6
R4
1.78k
JP1c
3.3V
7
8
R5
976W
JP1d
5.0V
C5
330µF, 6.3V
Vishay-Dale
594D337X06R3D2T
330µF, 6.3V
Vishay-Dale
594D337X06R3D2T
330µF, 6.3V
Vishay-Dale
594D337X06R3D2T
330µF, 6.3V
Vishay-Dale
594D337X06R3D2T
C5
330µF
6.3V
C6**
M9999-012610
V
GND
C7
0.1µF
50V
MIC4685
2A
J2
J4
OUT