MAX1870AETJ Datasheet, PDF (17/32 Pages) Maxim Integrated Products – Step-Up/Step-Down Li+ Battery Charger

Step-Up/Step-Down
Li+ Battery Charger
IINP
ASNS
CSSN
CSSP
CSSS
CLS
CCS
CCI
ICTL
CSIP
CSIN
CCV
VCTL
A = 18V/V
CURRENT-
SENSE
AMPLIFIERS
A = 18V/V
CSS
3.6V
(6.7A FOR 30mΩ)
GMS
INPUT-CURRENT BLOCK
Gm
IMAX1
0.81mV
(1.5A FOR 30mΩ)
x ^50mV
REFIN
GMI
A = 18V/V
CSI
22.5mV
(42mA ON
30mΩ)
CHARGE-CURRENT BLOCK
(6.7A FOR 30mΩ)
3.6V
x ^400mV + 4.0V
REFIN
4.2V
LVC
0.15V
MAX1870A
IZX
IMAX1
IMAX2
LVC
IMIN
STEP-UP/DOWN
CURRENT-MODE
STATE MACHINE
LEVEL
SHIFT
CHG
SHUTDOWN LOGIC
GMV
HIGH-
SIDE
DRIVER
LOW-
SIDE
DRIVER
23% OF
REFIN
ICTL
REF
BATT
CELLS
CELL-
SELECT
LOGIC
BATTERY-VOLTAGE BLOCK
RDY
5.4V LINEAR
REGULATOR
4.096V
REFERENCE
1/55
VHP
DHI
VHN
DLOV
DBST
PGND
SHDN
GND
Figure 3. Functional Diagram
DCIN
LDO
REF
REFIN
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