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MIC4690YM

P1-P3P4-P6P7-P9P10-P12
MIC4690 Micrel
MIC4690 10 April 2005
Power
SOP-8
Figure 5. Critical Traces for Layout
µ
µ
µ
µ µ
Figure 6a. Evaluation Board Schematic Diagram
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
IN
close to pin 2 and pins 5 though 8. See “Applications
Information: Thermal Considerations” for ground plane lay-
out.
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.
April 2005 11 MIC4690
MIC4690 Micrel
Abbreviated Bill of Material (Critical Components)
Reference Part Number Manufacturer Description Qty
C1 595D2260035D2T Vishay Sprague
1
22µF, 35V 1
ECE-A1HFS470 Panasonic 47µF, 50V, 8mm X 11.5mm
TPSD226M035R0300 AVX
2
22µF, 35V
C2, C6 VJ0805Y104KXAMB Vishay Vitramon
2
0.1µF 50V 2
C4 594D227X0010D2T Vishay Sprague
1
220µF, 10V 1
D1 SS24 Micro Commercial Corp
3
Schottky 2A, 40A 1
B240A Diode Inc
L1 CDRH6D38-180MC Sumida
4
18µH, 1.5A I
SAT
1
U1 MIC4690BM Micrel Semiconductor
5
1A 200kHz power-SO-8 buck regulator 1
1
Vishay Dale, Inc., tel: 1 877-847-4291, http://www.vishay.com
2
Diodes Inc, tel: (805) 446-4800, http://www.diodes.com
3
Micro Commercial Corp., tel: (800) 346-3371
4
Sumida, tel: (408) 982-9960, http://www.sumida.com
5
Micrel, tel: (408) 944-0800, http://www.micrel.com
Printed Circuit Board Layouts
Figure 6b. Top-Side Silk Screen
Figure 6c. Top-Side Copper
Figure 6d. Bottom-Side Silk Screen
Figure 6e. Bottom-Side Copper
MIC4690 Micrel
MIC4690 12 April 2005
Package Information
45°
0°–8°
0.244 (6.20)
0.228 (5.79)
0.197 (5.0)
0.189 (4.8)
SEATING
PLANE
0.026 (0.65)
MAX)
0.010 (0.25)
0.007 (0.18)
0.064 (1.63)
0.045 (1.14)
0.0098 (0.249)
0.0040 (0.102)
0.020 (0.51)
0.013 (0.33)
0.157 (3.99)
0.150 (3.81)
0.050 (1.27)
TYP
PIN 1
DIMENSIONS:
INCHES (MM)
0.050 (1.27)
0.016 (0.40)
8-Lead SOP (M)
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL + 1 (408) 944-0800 FAX + 1 (408) 474-1000 WEB http://www.micrel.com
The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use.
Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can
reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into
the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s
use or sale of Micrel Products for use in life support appliances, devices or systems is at Purchaser’s own risk and Purchaser agrees to fully indemnify
Micrel for any damages resulting from such use or sale.
© 2005 Micrel, Incorporated.
P1-P3P4-P6P7-P9P10-P12

MIC4690YM

Mfr. #:
Buy MIC4690YM
Manufacturer:
Microchip Technology / Micrel
Description:
Switching Voltage Regulators 500KHz Simple Buck Regulator
Lifecycle:
New from this manufacturer.
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