MAX1747 View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

MAX1747

Triple Charge-Pump TFT LCD DC-DC Converter

Maxim Integrated 

Triple Charge-Pump TFT LCD DC-DC Converter

PC Board Layout and Grounding

Careful printed circuit layout is important to minimize

ground bounce and noise. First, place the main charge-

pump flying capacitor less than 0.2in (5mm) from the

CXP and CXN pins with wide traces and no vias. Then

place 0.1µF ceramic bypass capacitors near the

charge-pump input pins (SUPP and SUPN) to the

PGND pin. Keep the charge-pump circuitry as close to

the IC as possible, using wide traces and avoiding vias

when possible. Locate all feedback resistive dividers as

close to their respective feedback pins as possible. The

PC board should feature separate analog and power

ground areas connected at only one point under the IC.

To maximize output power and efficiency, and minimize

output power ripple voltage, use extra-wide power

ground traces, and solder the IC’s power ground pin

directly to it. Avoid having sensitive traces near the

switching nodes and high-current lines.

Refer to the MAX1747 evaluation kit for an example of

proper board layout.

Chip Information

TRANSISTOR COUNT: 2534

Package Information

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are

implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 13

© 2000 Maxim Integrated Products

Printed USA

is a registered trademark of Maxim Integrated Products.

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