LTC3418 Ver la hoja de datos (PDF) - Linear Technology

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Fabricante

LTC3418

8A, 4MHz, Monolithic Synchronous Step-Down Regulator

Linear Technology 

LTC3418

PIN FUNCTIONS

VREF (Pin 16): Reference Output. Decouple this pin with

a 2.2μF capacitor.

SVIN (Pin 24): Signal Input Supply. Decouple this pin to

SGND with a capacitor.

VFB (Pin 25): Feedback Pin. Receives the feedback voltage

from a resistive divider connected across the output.

ITH (Pin 26): Error Amplifier Compensation Point. The

current comparator threshold increases with this control

voltage. Nominal voltage range for this pin is from 0.2V

to 1.4V with 0.4V corresponding to the zero-sense voltage

(zero current).

SYNC/MODE (Pin 27): Mode Select and External Clock

Synchronization Input. To select Forced Continuous, tie

to SVIN. Connecting this pin to a voltage between 0V and

1V selects Burst Mode operation with the burst clamp set

to the pin voltage.

TRACK (Pin 35): Voltage Tracking Input. Feedback volt-

age will regulate to the voltage on this pin during start-up

power sequencing.

Exposed Pad (Pin 39): The Exposed Pad is PGND and must

be soldered to the PCB ground for electrical connection

and rated thermal performance.

BLOCK DIAGRAM

VREF

16

TRACK

35

25 VFB

0.74V

0.86V

24

SVIN

8

26

SGND ITH

PVIN

3 29

VOLTAGE

REFERENCE

ERROR

+

AMPLIFIER

–

+

SYNC/MODE

+

–

SLOPE

COMPENSATION

RECOVERY

BURST

COMPARATOR

–

BCLAMP

4 28

PMOS CURRENT 9 23

COMPARATOR

10 22

+

OSCILLATOR

SLOPE

COMPENSATION

SW

12

11 12

20 21

+

30 31

LOGIC

NMOS

–

CURRENT

COMPARATOR

RUN/SS

7

RUN

PGOOD

5

CURRENT

REVERSE

COMPARATOR

RT

SYNC/MODE

6

27

PGND

13 32

14 33

15 34

17 36

18 37

19 38

3418 BD

6

3418fb

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