mic4690 Micrel Semiconductor, mic4690 Datasheet - Page 10

• Manufacturer Part Number: mic4690
• Description: Mic4690 500khz 1a Superswitcher? Buck Regulator
• Manufacturer: Micrel Semiconductor

MIC4690
To minimize stray inductance and ground loops, keep trace
lengths, indicated by the heavy lines in Figure 5, as short as
possible. For example, keep D1 close to pin 3 and pins 5
through 8, keep L1 away from sensitive node FB, and keep
C
Information: Thermal Considerations” for ground plane lay-
out.
MIC4690
IN
close to pin 2 and pins 5 though 8. See “Applications
µ
(34V transients)
+4V to +30V
µ
Power
SOP-8
Figure 6a. Evaluation Board Schematic Diagram
V
IN
C
IN
Figure 5. Critical Traces for Layout
IC4690B
2
1
VIN
SHDN
IC4690B
5 6 7 8
GND
SW
FB
10
3
4
The feedback pin should be kept as far way from the switching
elements (usually L1 and D1) as possible.
A circuit with sample layouts are provided. See Figures 6a
though 6e. Gerber files are available upon request.
µ
D1
1
C
OUT
R1
R2
GND
V
OUT
µ
µ
April 2005
Micrel