Rainbow-electronics MAX1774 Manual do Utilizador descarregar pdf (Página 18)

nals, and be close together to improve noise rejection.

These traces should be used for current-sense signal

routing only and should not carry any load current.

Refer to the MAX1774 evaluation kit for layout exam-

ples.

Setting the Voltage Monitor Levels

The low battery and dead battery detector trip points

can be set by adjusting the resistor values of the

divider string (R1, R2, and R3) in Figure 1 according to

the following equations:

R1 = (R2 + R3)

[(V

/ V

) - 1]

R2 = R3

[(V

/ V

) - 1]

where V

is the low battery voltage, V

is the dead

battery voltage, and V

= +1.20V. Choose R3 to be

less than 250kΩ.

MAX1774

Dual, High-Efficiency, Step-Down

Converter with Backup Battery Switchover

18 ______________________________________________________________________________________

Figure 5. Typical Application Circuit (with Recharge)

PGNDC

FBC

LXC

INC

FBM

CS-

CS+

PGND

PDRV

NDRV

CVH

MAIN

10µH

MAIN

47µF

CORE

22µF

R10

R11

1µF

1MΩ

GND

REF

CVL

LXB

BIN

DBI

LBI

BACKUP

BATTERY

MAIN

BATTERY

R13

10µF

0.22µF

10µF

R12

BKOFF

BKUP

LBO

ACO

SHDNM

MDRV

MAX1774

22µH

IN_AC

ACI

SHDNC

10µF

OFF

1.0V

5.5V

2.6V

5.5V

FDS8928A

INS

1MΩ

2.7V

20V

2.7V

28V

NDS356AP

NSD03A10

0.9V

5.5V

LXB2 (QFN ONLY)

EP05

Q03L

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