Rainbow-electronics MAX1774 Manual do Utilizador descarregar pdf (Página 15)

MAX1774

Dual, High-Efficiency, Step-Down

Converter with Backup Battery Switchover

______________________________________________________________________________________ 15

Figure 3. Simplified Block Diagram

LBO

DBO

1.2V

LBI

DBI

ACI

BIN

CVL

REF

SHDNM

SHDNC

LXB

1.2V

INS

0.5V

0.22V

LBO

MDRV

BKUP

MODE

ACO

CS- (MAIN OUT)

CS+

PDRV

CVH

NDRV

PGND

INC

LXC

PGNDC

GND

FBC

RDY

CS-

MAIN

BUCK

CS+

MDRV

BKUP

NOAC

CORE

BUCK

PGND

BACKUP

BOOST

FBM

CVH

CVLREF

SOFT-START

MAX1774

MAIN

RDY

BKOFF

LXB2

(QFN ONLY)

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 21

32 7mm x 7mm QFN 1
TOP VIEW 1
ABSOLUTE MAXIMUM RATINGS 2
ELECTRICAL CHARACTERISTICS 2
(Circuit of Figure 1, V 8
= +5V, V 8
= +3.3V, T 8
Pin Description 10
Detailed Description 11
Pin Description (continued) 11
100% Duty Cycle and Dropout 12
Regulation Control Scheme 13
Main Step-Down Converter 14
Core Step-Down Converter 14
Design Procedure 16
Setting the Current Limit 17
Chip Information 19
Package Information 20
QSOP.EPS 21

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