LTM4703

26

Rev. 0

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Figure 13. 3-Phase 3.3V, 36A from 4.5V to 16VIN, 1MHz with Soft-Start, Fast Start-Up and Power Good

1µF

10Ω

105k

100nF

280k

220µF

×2

1µF

10Ω

137k

100nF

22µF

×3

280k

220µF

×2

22µF

×2

VIN

SVIN

RUN

COMPa

SET

RT

AGND

LTM4703

VOUT

VOSNS

PGSET

GND

CLKOUT

SYNC

PHMODE

INTVCC

fSW = 1MHz

VIN

SVIN

RUN

COMPa

SET

RT

AGND

LTM4703

VOUT

VOSNS

PGSET

GND

SYNC

CLKOUT

PHMODE

INTVCC

EXTERNAL

ENABLE

SIGNAL

VIN

4.5V TO 16V

VOUT

3.3V, 36A

CH1

CH2

CH2 AND CH3 ARE SYNCHRONIZED TO 1MHz VIA THE SYNC PIN. THE RT RESISTOR VALUE MUST SET INTERNAL

OSCILLATOR TO <0.8MHz (80% OF 1MHz).

COMPa PINS ARE CONNECTED TOGETHER.

PHMODE PIN FLOATS FOR 120°. PHASE SHIFT AT CLKOUT.

SET PINS CAN BE CONNECTED TOGETHER FOR 300µA CURRENT REFERENCE; THIS PROVIDES LOWER 1/f NOISE AND BETTER

CURRENT SHARING.

PG

PG

PINS NOT USED: COMPb, SW, TSENSE+, TSENSE–.

120°

120°

6.8nF

1k

1µF

10Ω

137k

100nF

1µF

11k

280k

220µF

×2

VIN

SVIN

RUN

COMPa

SET

RT

AGND

LTM4703

VOUT

VOSNS

PGSET

GND

SYNC

PHMODE

INTVCC

CH3

PG

4703 F13

100k

100k

100k

TYPICAL APPLICATION