Rainbow-electronics MAX769 Manual do Utilizador descarregar pdf (Página 8)

MAX769

2 or 3-Cell, Step-Up/Down,

Two-Way Pager System IC

8 _______________________________________________________________________________________

LB0

TO S1

AND S2

LBI

CH0

0.6V

CH0

RUN/

COAST

OV0–OV4

SERIAL

I/O

CH1

CH2

DAC0–DAC7

RESET

CONTROL

V FEEDBACK

CHARGE

NICD

BACKUP

REGULATOR

PWM

(PFM IN

COAST)

CHG/REG

–

CP0

CP1

CP2

25 27

SDOSDISCL

3 26

REF

0.6V

1µF

10µA

1.0V

REG3

1µF

RSIN

17 18 19 16 15

DR1 DR2IN DR2

AGNDDRGND

1.8Ω

REG2 ON

REG3 ON

N N

–

FROM

NICD

FROM

BATTERY

7-BIT

DAC

REG2

REG1

R2IN

OFS

0.1µF

OFS

NICD

OFS

15k

10µF

OUT

SYNC

FILT

PGND

LX2

LX1

BATT

2- OR 3-CELL

BATTERY IN

68µH

22µF

47µF

OUT

–

1.28V

REFERENCE

1.0V

–

BACKUP

REGULATOR

CLAMP ON WHEN

OV4 = 1

3.3V

CLAMP

1mA/15mA

3.3V

–

1nF

22nF

10k

PLL

LBO

RSO

MAX769

Figure 1. MAX769 Block Diagram

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

2 or 3-Cell, Step-Up/Down 1
Two-Way Pager System IC 1

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