MAX5072ETJ View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

MAX5072ETJ

2.2MHz, Dual-Output Buck or Boost Converter with POR and Power-Fail Output

Maxim Integrated 

2.2MHz, Dual-Output Buck or Boost

Converter with POR and Power-Fail Output

VIN

OUTPUT2

V+

DRAIN2

DRAIN1

SOURCE2 SOURCE1

CIN

OUTPUT1

OUTPUT4

V+

DRAIN2

DRAIN1

SOURCE2 SOURCE1

OUTPUT3

DUTY CYCLE = 50%

CLKIN

SYNC

CLKOUT

MASTER

SYNC

SLAVE

SYNC

CLKOUT

(MASTER)

CLKOUT

(SLAVE)

SOURCE1

(MASTER)

SYNCPHASE

SOURCE2

(MASTER)

SOURCE1

(SLAVE)

SOURCE2

(SLAVE)

CLKOUTPHASE

CIN (RIPPLE)

Figure 3. Synchronized Controllers

Frequency Select (FSEL1)

Sometimes it is necessary to operate the converter at a

lower switching frequency to keep the losses low for

lower power dissipation. However, it is not possible to

have different frequencies for two converters operating

out-of-phase. Also, frequency beating may occur if the

individual converter frequencies are not selected care-

fully. To avoid these issues, and still achieve the lower

power dissipation in the package, the MAX5072 pro-

vides a frequency select (FSEL1) pin. Connecting

FSEL1 to ground reduces the switching frequency of

converter 1 to 1/2 the switching frequency of converter

2 and 1/4th of the internal oscillator switching frequen-

cy. In this case, the input capacitor ripple frequency is

1.5 times the converter 2 switching frequency and also

has unsymmetrical ripple waveform.

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