Owner manual

MAX1538
Power-Source Selector for
Dual-Battery Systems
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MAX1538
REVBLK
DISA
DISB
BATA
BATB
CHGB
CHGA
CHGIN
ADPIN
EXTLD
ADPBLK
BATTERY A
BATTERY B
AIRDET
ACDET
MINVA
MINVB
V
DD
CHRG
BATSEL
RELRN
OUT2
OUT1
OUT0
GNDBATSUP
ADAPTER
ADPPWR
R1 R2 R3
P1
IN
P2
P3
P5
P6P7
P8
STEP-DOWN CHARGER
C
SYS
C
CHG
C2
FOR RELEARN
MODE ONLY
C
BATB
C
BATA
D1
D2
R10
R11
R12
R13
C1
0.1µF
LOGIC SUPPLY
R
SNS
SYSTEM LOAD
CHARGER OUTPUT
C
ADAPTER
C3
0.1µF
CHARGER INPUT
OUT
Figure 1. Step-Down Typical Application Circuit