Datasheet

Stand-Alone Switch-Mode
Lithium-Ion Battery-Charger Controller
current-sense resistor may degrade accuracy due to
the input offset of the current-sense amplifier.
The charging-current error amplifier (GMI) is compen-
sated at CCI. A 47nF capacitor at CCI provides suit-
able performance for most applications.
Input Current Regulator
The total input current (from a wall cube or other DC
source) is the sum of system supply current plus the
battery-charging current. The input current regulator
limits the source current by reducing charging current
when input current exceeds the set input current limit.
System current normally fluctuates as portions of the
system are powered up or put to sleep. Without input
PWMCOMP
ON
BST
CCI
DHI
LX
DLO
VLO
PGND
CCV
CCS
LO
PWMCMP
ILIMIT
LOWILIM
OSC
160ns
160ns
PWMOSC
REF/42
REF/2
REF/2.6
CCI
GND
CCS
LVC
GMS
GND
GND
R
GND
R
R/9
3R
DHI
DLO
GATE
CONTROL
CCV
SW+
SW-
CS+
CS-
EA+
EA-
GMI
10x
CSS
GMV
GND
GND
R
R
R/2
R/2R/2R
R
9R
CELL
CELL
REF
VADJ
3R
ISETOUT
ISETIN
REF/42
STOP
SLOPE
COMP
BATT
SAW
PREQ
BATT
SHDN
CS
CSSN
CSSP
ONE
TWO
THREE
FOUR
5x
CSI
MAX1737
Figure 3. PWM Controller Block Diagram
Maxim Integrated
11
MAX1737