Datasheet

MAX1870A
Step-Up/Step-Down
Li+ Battery Charger
14 ______________________________________________________________________________________
MAX1870A
234
VHP
VHN
CSSP
CSSN
DHI
DBST
CSIP
CSIN
BATT
DLOV
LDO
BLKP
CSSS
16
12
13
28
26
31
29
27
22
14
9
10
11
DCIN
REF
CLS
CCV
CCI
CCS
REFIN
ASNS
VCTL
ICTL
CELLS
IINP
PGND
32
18
17
25
1
15
7
6
5
3
2
AC
ADAPTER
VDD
HOST
DIGITAL INPUT
D/A OUTPUT
D/A OUTPUT
HI-IMPEDANCE
OUTPUT
LOGIC OUTPUT
A/D INPUT
GND
SYSTEM LOAD
+
-
R3
R4
R7
10kΩ
C6
0.01μF
C8
22μF
C9
44μF
C7
1μF
RS2
30mΩ
L1
10μH
C11
1μF
C12
1
μF
M2
M1
19
N
P
RS1b
30mΩ
GND
30
RS1a
30mΩ
R6
33Ω
C5
1μF
C1
1μF
D1
D2
OPTIONAL REVERSE-
ADAPTER PROTECTION
2.2μF
2.2μF
D3
D4
R5
10kΩ
C2
0.01μF
C3
0.01μF
C4
0.01μF
SHDN
Figure 1. µC-Controlled Typical Application Circuit