MAX863EEE Ver la hoja de datos (PDF) - Maxim Integrated

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MAX863EEE

Dual, High-Efficiency, PFM, Step-Up DC-DC Controller

Maxim Integrated 

Dual, High-Efficiency, PFM, Step-Up

DC-DC Controller

Step-Up/Down SEPIC Converter

and 12V Supply

The circuit in Figure 9 provides a buck/boost function for

applications where the input voltage range can be

greater than or less than VOUT1. It provides 3.3V (up to

600mA) or 5V, as well as 12V (up to 200mA at VIN = 2.4V)

for powering flash memory or analog functions.

The main output employs a SEPIC topology using a

coupled inductor and a capacitor to transfer energy to

the output. C2 must be a low-ESR type capable of

withstanding high ripple current. Ceramic and Sanyo

OS-CONs work well, but low-ESR aluminum electrolyt-

ics (which are less costly) are tolerable. Do not use a

tantalum capacitor for C2. C2’s voltage rating must be

higher than the maximum input voltage. The MOSFET

must withstand a voltage equal to the sum of the input

and output voltages; i.e., when converting 11V to 3.3V,

the MOSFET must withstand 14.3V. The dual Schottky

diode D3 bootstraps power to the MAX863, allowing

use of the low-voltage start-up oscillator, as well as

improved gate-drive voltages during normal operation.

___________________Chip Information

TRANSISTOR COUNT: 858

SUBSTRATE CONNECTED TO GND

________________________________________________________Package Information

16 ______________________________________________________________________________________

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