AA18380 Agamem Microelectronic, AA18380 Datasheet - Page 12

• Manufacturer Part Number: AA18380
• Description: Switching Regulator Controller
• Manufacturer: Agamem Microelectronic

PRELIMINARY
■PC Board Layout Guideline
PCB layout is very important for DC-DC operation. Please follow the notes and sample layout below.
• Create a power ground island consisting of the input and output capacitor grounds and GND pins.
• Make the lines in the high-current loop as wide as possible and placing the inductor, rectifier diode,
• Position the input filter capacitor C3 as close as possible to the VCC and ground pins, and assure
• Keep the length of the line between the OUT pin and the switching device (MOSFET or other
• The inductor and rectifier diode need to be close with OUT pin.
• Place the feedback resistor – R2 as close to the IN1- pin as possible. The divider’s center trace
• Minimize the length and maximize the width of the traces between the output capacitors and the load
■NOTES ON USE
©Copyright Agamem Microelectronics Inc.
• The information described herein is subject to change without notice.
• The specifications for the product described in this document are for reference only. Upon actual use,
•The application circuit examples explain typical applications of the products, and do not guarantee the success
• Application circuit diagrams and circuit constants contained herein are shown as examples of standard use
• Take account of common impedance when designing the earth line on a printed wiring board.
Connect all of these together with short, wide traces or a small ground plane and isolate the IC
ground from the power system.
and output capacitors near the input capacitors and near the OUT and GND pins.
that there are no other paths for switching noise to enter the IC.
transistor) as short as possible to provide a clean switching pulse to the switching device.
should be kept short. Placing the resistors far away causes picking up switching noise. Avoid running
the feedback trace near OUT pin.
for best transient responses.
therefore, please request that specifications to be separately delivered.
of any specific mass-production design.
and operation. Please pay careful attention to the peripheral conditions when designing circuits and deciding
upon circuit constants in the set.
Agamem Microelectronics Inc.
(Please refer to boost type application circuit for this PCB layout sample.)
12
AA18380
Switching Regulator Controller
www.agamem.com.tw
2007/1/15