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MIC38150 Datasheet(PDF) 10 Page - Micrel Semiconductor |
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MIC38150 Datasheet(HTML) 10 Page - Micrel Semiconductor |
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10 / 15 page  Micrel, Inc. MIC38150 June 2010 10 M9999-061010-C PCB Layout Guideline Warning!!! To minimize EMI and output noise, follow these layout recommendations. PCB Layout is critical to achieve reliable, stable and efficient performance. A ground plane is required to control EMI and minimize the inductance in power, signal and return paths. The following guidelines should be followed to insure proper operation of the MIC38150. IC • Place the IC close to the point of load (POL). • Use fat traces to route the input and output power lines. • The exposed pad (ePAD) on the bottom of the IC must be connected to the PGND pins of the IC. • Use several vias to connect the ePAD to the ground plane. • Signal and power grounds should be kept separate and connected at only one location. • Keep the switch node (SW) away from the feedback (FB) pin. Input Capacitor • Place the input capacitor next. • Place the input capacitors on the same side of the board and as close to the MIC38150 as possible. • Keep both the PVIN and PGND connections short. • Place several vias to the ground plane close to the input capacitor ground terminal, but not between the input capacitors and IC pins. • Use either X7R or X5R dielectric input capacitors. Do not use Y5V or Z5U type capacitors. • Do not replace the ceramic input capacitor with any other type of capacitor. Any type of capacitor can be placed in parallel with the input capacitor. • If a Tantalum input capacitor is placed in parallel with the input capacitor, it must be recommended for switching regulator applications and the operating voltage must be derated by 50%. • In “Hot-Plug” applications, a Tantalum or Electrolytic bypass capacitor must be used to limit the over- voltage spike seen on the input supply with power is suddenly applied. • The 1µF capacitor, which connects to the AVIN terminal, must be located right at the IC. The AVIN terminal is very noise sensitive and placement of the capacitor is very critical. Connections must be made with wide trace. Output Capacitor • Use a wide trace to connect the VSW output capacitor ground terminal to the PVIN input capacitor ground terminal. • The feedback trace should be separate from the power trace and connected as close as possible to the output capacitor. |
Similar Part No. - MIC38150_10 |
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Similar Description - MIC38150_10 |
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