LTC1778EGN-1 Просмотр технического описания (PDF) - Linear Technology

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LTC1778EGN-1

Wide Operating Range, No RSENSE™ Step-Down Controller

Linear Technology 

LTC1778/LTC1778-1

W

FU CTIO AL DIAGRA

RON

2 VON** 7 ION

4 FCB

0.7V 2.4V

1µA

9 EXTVCC

4.7V

+–

1

tON

=

VVON

IION

(10pF)

R

SQ

0.8V

–+

F

20k

+

ICMP

IREV

–

1.4V

VRNG

3

0.7V

×

3.3µA

FCNT

ON

SWITCH

LOGIC

SHDN

OV

VIN

10 VIN

+

CIN

0.8V

REF

5V

REG

BOOST

16

TG

CB

15

SW

14

INTVCC

11

BG

12

DB

CVCC

PGND

13

PGOOD*

2

M1

L1

VOUT

+

M2

COUT

R2

1

240k

ITHB

1V

Q2 Q4

Q6

Q3 Q1

+– 0.8V

×4

EA

0.8V

*LTC1778

**LTC1778-1

Q5

SS

–+

0.6V

5 ITH RC CC1

0.74V

UV

RUN

SHDN

OV

0.86V

1.2µA

6V

0.6V

1 RUN/SS CSS

VFB

8

R1

SGND

6

1778 FD

1778fb

8

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