MAX769 데이터 시트보기 (PDF) - Maxim Integrated
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MAX769 Datasheet PDF : 16 Pages
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2 or 3-Cell, Step-Up/Down,
Two-Way Pager System IC
LBO 6
LBI 11
CH0 9
REF
8
1µF
RSIN 10
RSO 7
2- OR 3-CELL
BATTERY IN
22µF
SCL SDI SDO CS
5
2 3 27
N
26 BATT
P
28 LX2
–
0.6V
CPLB
+
FROM
NICD
S1
FROM
BATTERY
S2
TO S1
AND S2
7-BIT
CH
DAC
MAX769
LB0
RUN/
+
COAST
CP0
CH0
–
SERIAL
I/O
+
–CP1
CH1
5
OV0–OV4
+
CP2
CH2
–
7
DAC0–DAC7
RESET
CONTROL
3.3V
CLAMP
-
5
+AOUT
V FEEDBACK
PWM
(PFM IN
COAST)
X7
PLL
N
PGND
4
N
1 LX1
L1
68µH
P
CLAMP ON WHEN
OV4 = 1
–
+AR1
12 FILT
13
SYNC
OUT
25
P
47µF
22nF
1nF
10k
REG1
24
10µF
BACKUP
REGULATOR
CHARGE
NICD
OR
BACKUP
REGULATOR
ROFS
15k
NICD
23
1.28V
REFERENCE
CHG/REG
1mA/15mA
14 OFS
0.6V +
–CPRS
N
1.8Ω
N
10µA
REG2 ON
REG3 ON
1.8Ω
N
–
3.3V
AR2
+
1.0V –
AR3
+
22 R2IN
COFS
P
0.1µF
REG2
21
10µF
P
REG3
20
1.0V
1µF
17
18
19
16
DR1
DR2IN
DR2
DRGND
15
AGND
Figure 1. MAX769 Block Diagram
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