LTM4703

27

Rev. 0

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Figure 14. 4-Phase 2.5V, 48A from 3.9V to 16VIN, 1MHz with Soft-Start, Fast Start-Up and Power Good

1µF

10Ω

105k

100nF

200k

220µF

×2

1µF

10Ω

137k

100nF

22µF

×3

200k

220µF

×2

22µF

×2

VIN

SVIN

RUN

COMPa

SET

RT

LTM4703

VOUT

PGSET

GND

SYNC

PHMODE

INTVCC

fSW = 1MHz

VIN

SVIN

RUN

COMPa

SET

RT

LTM4703

VOUT

PGSET

GND

PHMODE

INTVCC

EXTERNAL

ENABLE

SIGNAL

VIN

3.9V TO 16V

VOUT

2.5V, 48A

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 IS CONNECTED TO INTVCC FOR 90°. PHASE SHIFT AT CLKOUT.

SET PINS CAN BE CONNECTED TOGETHER FOR 400µA CURRENT REFERENCE; THIS PROVIDES LOWER 1/f NOISE AND BETTER

CURRENT SHARING.

PG

PG

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

90°

6.8nF

1k

1µF

10Ω

137k

100nF

200k

220µF

×2

VIN

SVIN

RUN

COMPa

SET

RT

LTM4703

VOUT

PGSET

GND

PHMODE

INTVCC

CH3

PG

AGND

AGND

AGND

100k

100k

100k

90°

90°

VOSNS

VOSNS

VOSNS

1µF

10Ω

137k

100nF

1µF

6.26k

200k

220µF

×2

VIN

SVIN

RUN

COMPa

SET

RT

CLKOUT

LTM4703

VOUT

PGSET

GND

SYNC

CLKOUT

SYNC

CLKOUT

SYNC

CLKOUT

PHMODE

INTVCC

CH4

PG

AGND

4703 14

100k

VOSNS

TYPICAL APPLICATION