LTC1538-AUX View Datasheet(PDF) - Linear Technology

Part Name

Description

MFG CO.

LTC1538-AUX

Dual High Efficiency/ Low Noise/ Synchronous Step-Down Switching Regulators

Linear Technology 

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APPLICATIONS INFORMATION

LTC1538-AUX/LTC1539

CLP

RLP

0.01µF

10k

CSS

0.1µF

1000pF

CC1B

220pF

CC1A

1000pF

RC1

10k

COSC

CC2B

470pF

CC2A

RC2

1000pF

10k

56pF

OUTPUT DIVIDER

REQUIRED WITH

VPROG OPEN

220pF

10Ω

1

36

RUN/SS1 PLL LPF

1000pF

2 SENSE+ 1

35

PLLIN

3 SENSE– 1 BOOST 1 34

4

INTVCC

VPROG1

33

TGL1

5

ITH1

VIN

100k 6

POR2

32

SW1

31

TGS1

7

LTC1539

30

COSC

VIN

8

SGND

29

BG1

9

LBI

10

LBO

28

INTVCC

27

PGND

INT VCC 11 SFB1

26

BG2

100pF

22pF

1000pF

12

ITH2

13

VPROG2

14

VOSENSE2

15 SENSE– 2

25

EXTVCC

24

TGS2

23

SW2

22

TGL2

16 SENSE+ 2 BOOST 2 21

17

20

RUN/SS2 AUXON

CSS

18

AUXDR

10Ω 0.1µF

19

AUXFB

EXT

CLOCK

CB1

0.1µF

M3

DB1

+ 4.7µF

DB2

M6

CB2

0.1µF

M1 + CIN1

L1

RSENSE1

M2

D1

+

COUT1

GROUND PLANE

M5

D2

+ COUT2

L2

RSENSE2

+

M4

CIN2

NOT ALL PINS CONNECTED FOR CLARITY

BOLD LINES INDICATE HIGH CURRENT PATHS

++

VOUT1

VIN

–

–

–

VOUT2

+

1538 F13

Figure 13. LTC1539 Physical Layout Diagram

25

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