LT8602 datasheet(34/38 Pages) LINER

34 / 38 page

LT8603

8603f

For more information www.linear.com/LT8603

Four Regulated Outputs with Channel 4 Configured as a SEPIC

TYPICAL APPLICATIONS

Start-Up Sequence

Wurth 74437336033

Wurth 74437336015

Wurth 74437324010

Wurth 74485540220

SD1

PMEG060V050EPD

BSZ067N06LS3

L3, 1.0H

C15, 22pF

R10, 499k

R11, 1MEG

C16

47F

1.2V

C12

0.1F L2, 1.5H

C13, 15pF

R8, 825k

R9, 357k

C14

47F

3.3V

R12

28.7k

C10, 4.7F

C11, 4.7F

C9, 2.2nF

C7, 2.2nF

2.2H

SD2*

SD1

SD4

SD3

2.2H

20F

CVIN1**

4.7F

CVIN2**

4.7F

VBATT

3V TO 42V

(4.3V TO START)

0.1F L1, 3.3H

C8, 3.3pF

R6, 1MEG

R7, 249k

C17

22F

OUT1

5.0V

8603 TA04a

ISP4

FB4

TRKSS1

TRKSS2

INTVCC4

INTVCC

FSEL4A

RUN3

FSEL4B

SYNC

EN/UVLO

ISN4 GATE4

VIN

PVIN1 PVIN2

BST1

SW1

FB1

BST2

SW2

FB2

BIAS

PVIN3

SW3

FB3

LT8603

GND

*SD2 OPTIONALLY PROVIDES REVERSE BATTERY PROTECTION. REPLACE WITH SHORT IF NOT REQUIRED.

SD3 ENSURE START-UP. SD4 MAINAINS VIN AT VBATT < 4V.

**CVIN1, CVIN2, AND CVIN3 SHOULD BE PLACED AS CLOSE AS POSSIBLE TO THEIR RESPECTIVE PVIN PINS.

20F

100F

OUT4

806k

1MEG

UNUSED PINS NOT SHOWN:

PG1-4, POR, CPOR, RST

VOUT4 = 0.8 •

(R4+R5)

1MEG

110k

CVIN3**

4.7F

•

VOUT3

VOUT2

VOUT1

VOUT4

VIN AT 10V/DIV

20ms/DIV

2V/DIV

10V/DIV

8603 TA04b

LT8602 Arkusz danych(PDF) 34 Page - Linear Technology

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