MIC4685WR Micrel Inc, MIC4685WR Datasheet - Page 13

• 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 (Bootstrap 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.
I
2.1A
2.2A
2.0A
2.0A
OUT
*
3.01k
3.01k
3.01k
3.01k
R1
GND
V
J1
J3
IN
47µF
20V
C1
976Ω
1.78k
2.94k
6.49k
* C4 can be used to provide additional stability
R2
and improved transient response.
Note: optimized for 5V
OFF
ON
Table 1. Recommended Components for Common Output Voltages
7.5V – 16V
6.0V – 16V
5.0V – 16V
5.0V – 16V
V
0.1µF
IN
50V
C2
JP3
OUT
C1
47µF, 20V
Vishay-Dale
595D476X0020D2T
47µF, 20V
Vishay-Dale
595D476X0020D2T
47µF, 20V
Vishay-Dale
595D476X0020D2T
47µF, 20V
Vishay-Dale
595D476X0020D2T
2
5
IN
EN
MBRX120
U1 MIC4685_R
1A/20V
Figure 3. Schematic Diagram
D2
GND
4, Tab
SW
BS 1
FB
6
3
D1
3A, 30V
Schottky
+ Vishay
B330A
3A, 30V
Schottky
B330A
3A, 30V
Schottky
B330A
3A, 30V
Schottky
+ Vishay
B330A
D1
B330A
or
SS33
13
C3
0.33µF
50V
39µH
L1
D2
1A, 20V
Schottky
B120-E3
1A, 20V
Schottky
B120-E3
1A, 20V
Schottky
B120-E3
1A, 20V
Schottky
B120-E3
R1
R2
L1
39µH
Sumida
CDRH127R-390MC
39µH
Sumida
CDRH127R-390MC
39µH
Sumida
CDRH127R-390MC
39µH
Sumida
CDRH127R-390MC
C4*
optional
C5
330µF
6.3V
V
GND
C7
0.1µF
50V
J2
J4
OUT
C4
330µF, 6.3V
Vishay-Dale
594D337X06R3D2T
330µF, 6.3V
Vishay-Dale
594D337X06R3D2T
330µF, 6.3V
Vishay-Dale
594D337X06R3D2T
330µF, 6.3V
Vishay-Dale
594D337X06R3D2T
M9999-012610
MIC4685