Low-Cost, Multichemistry Battery-
Charger Building Block
DCIN
LDO
5.4V LINEAR
REGULATOR
4.096V
REFERENCE
REF
MAX1772
MAX172
LOGIC
BLOCK
GND
1/55
ICTL
REFIN
GND
ACIN
SRDY
ACOK
REF/2
IINP
CCS
CLS
GMS
CSSP
CSSN
LEVEL
SHIFTER
ICHG
CSIP
CSIN
LEVEL
SHIFTER
BST
DHI
LX
LEVEL
SHIFTER
DRIVER
GMI
204mV
X ——-
REFIN
ICTL
CCI
BATT
DC-DC
CONVERTER
LVC
R1
DLOV
DLO
CELL SELECT
LOGIC
GMV
CELLS
DRIVER
CCV
PGND
409mV
X ——-
REFIN
VCTL
VOS
Figure 2. Functional Diagram
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