Datasheet

ManualsBrandsLINEAR TECHNOLOGY ManualsPMICsPMIC - voltage regulators - DC DC switch controllers PolyPhase® QFN 32

LTC3827

32

3827ff

TYPICAL APPLICATION

Efﬁ ciency vs Load Current Start-Up SW Node Waveform

High Efﬁ ciency Dual 5V/9.5V Step-Down Converter

C

IN1

10µF

C

INT2

1µF

D2

D1

C1

1nF

R

B1

365k

3827 TA03

C

SS1

0.01µF

C

ITH1

470pF

R

ITH1

10k

R

A1

69.8k

C

ITH1A

100pF

C2

1nF

R

B2

432k

C

SS2

0.01µF

C

ITH2

330pF

R

ITH2

15k

R

A2

39.2k

C

ITH2A

100pF

C

B2

0.47µF

100k

C

INT1

4.7µF

C

OUT2

150µF

C

B1

0.47µF

MTOP2

MBOT2

MTOP1

MBOT1

L2

7.2µH

R

SNS2

12mΩ

V

OUT1

5V

5A

V

IN

12V

V

OUT2

9.5V

3A

L1

3.3µH

R

SNS1

12mΩ

C

IN2

10µF

C

OUT1

150µF

I

TH1

V

FB1

SENSE1

+

SENSE1

–

PLLLPF

PHASMD

CLKOUT

PLLIN/MODE

SGND

RUN1

RUN2

SENSE2

–

SENSE2

+

V

FB2

I

TH2

TRACK/SS2

TRACK/SS1

PGOOD2

PGOOD1

TG1

SW1

BOOST1

BG1

V

IN

PGND

EXTV

CC

INTV

CC

BG2

BOOST2

SW2

TG2

FOLDDIS

+

100k

LTC3827

MTOP1, MTOP2, MBOT1, MBOT2: Si7848DP

L1: CDEP105-3R2M

L2: CDEP105-7R2M

C

OUT1

, C

OUT2

: SANYO 10TPD150M

LOAD CURRENT (mA)

EFFICIENCY (%)

0.01 0.1 1 10 100 1000 10000

3827 F16

0.001

40

50

60

70

80

30

20

10

0

90

100

V

OUT

= 5V

V

OUT

= 9.5V

20ms/DIV

3827 F17

V

OUT2

2V/DIV

V

OUT1

2V/DIV

1µs/DIV

3827 F18

SW1

5V/DIV

SW2

5V/DIV