LTC3521IFE Просмотр технического описания (PDF) - Linear Technology

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производитель

LTC3521IFE

1A Buck-Boost DC/DC and Dual 600mA Buck DC/DC Converters

Linear Technology 

Block Diagram (UF Package)

LTC3521

11

PVIN1

15

14

SW1A SW1B

A

INTERNAL

VCC

5 VIN

BC

PGND1A PGND1B

16

VOUT1

FILTER

+FORWIALIRMDIT 0.546V +

D

2.1A –

–

+

0.375A –

REVERSE ILIMIT

+

0A –

IZERO

PGOOD1

4

PVOUT

PWM

7

SHDN2

1

22 PVIN2

PVIN2

GATE

DRIVES

BUCK-BOOST

PWM

LOGIC

OSCILLATOR

UVLO

FB1

8

0.6V

SOFT-START

RAMP

SHDN1

10

SHDN3

9

PVIN2

SW2

20

GATE

DRIVES

BUCK

PWM

LOGIC

BUCK

PWM

LOGIC

GATE

DRIVES

SW3

17

FB2

24

PGND2

+

ZERO CROSSING

0A –

1.05A +

ILIMIT

–

+

SLOPE

COMPENSATION

–gm

+

0.60V ++

–

ZERO CROSSING

ILIMIT

PGND2

0A

1.05A

SLOPE

COMPENSATION

gm

FB3

23

0.60V

SOFT-START

RAMP

PGOOD2

3

0.546V

1.2V

0.6V

0.546V

0.25V

BANDGAP

REFERENCE

AND OT

SHUTDOWN

GND

PGND1A PGND1B

PGND2

6

21

12

18

SOFT-START

RAMP

–

+

0.546V

PGOOD3

2

3521 BD

For more information www.linear.com/LTC3521

3521fb

9

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