LTC3372

39

Rev. A

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4.5V to 60V Input 3.3V/10A Output HV Buck Converter Plus Quad 1V/4A, 1.2V/1A, 1.8V/1A and 2.5V/2A LV Regulators

TYPICAL APPLICATIONS

HV Controller Efficiency and

Power Loss vs Output Current

HV Controller Forced Continuous

Mode Load Step

MTOP

MBOT

D1

4.7uF

10nF

255k

0.01µF

100pF

2.2nF

6.34k

100k

100k

0.1µF

SWA

GND

SWB

FB1

EN1

SWC

ITH

SWD

FB2

EN2

TRACK/SS

RUN

PGOOD

RT

CT

PLL/MODE

SWE

SWF

FB3

EN3

SWG

SWH

C1 C2 C3

FB4

EN4

WDI

WDO

TEMP

RSTB

TG

BOOST

SW

BG

LTC3372

MTOP: BSZ099N06LS5

MBOT: BSZ067N06LS3

LHV: XAL1010-102ME

D1: DFLS1100

47µF

×2

2.2µF

×2

60V MAX

4.5V MIN

3m

LHV

1µH

47µF

150µF

×2

10

1nF

3.3V

10A*

309k

665k

47µF

L4

0.6µH

2.5V

2A

10µF

×2

10µF

×2

649k

162k

47µF

×2

L1

0.4µH

1V

4A

10µF

10µF

464k

232k

22µF

L2

1.5µH

1.2V

1A

649k

806k

22µF

L3

1.5µH

1.8V

1A

3372 TA04a

*FULL LOAD IS EQUIVALENT TO SPECIFIED LOAD CURRENT

BURST EFFICIENCY

BURST LOSS

FCM EFFICIENCY

PULSE–SKIPPING

EFFICIENCY

FCM LOSS

PULSE–SKIPPING

LOSS

OUTPUT CURRENT (A)

0.0001 0.001

0.01

0.1

1

1020

0

10

20

30

40

50

60

70

80

90

100

0.1

1

10

100

1000

10000

3372 TA04b

100µs/DIV

5A/DIV

AC–COUPLED

100mV/DIV

3372 TA04c