Datasheet

250 400
MAX1758
Stand-Alone, Switch-Mode
Li+ Battery Charger with Internal 28V Switch
6
Maxim Integrated
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V
DCIN
= V
HSD
= V
CSSP
= V
CSSN
= 18V, V
SHDN
= V
VL
, V
CELL
= GND, V
BATT
= V
CS
= 4.2V, V
VADJ
= V
REF
/ 2,
V
ISETIN
= V
ISETOUT
= V
REF
, R
THM
= 10kΩ, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 7)
Note 1: When V
ISETOUT
= 0, battery charger turns off.
Note 2: See
Thermistor section.
Note 3: Below this threshold, charger reverts to a prequalification mode with I
BATT
reduced to 10% of full scale.
Note 4: Above this threshold, charger is disabled.
Note 5: After full-charge state is complete and peak inductor current falls below this threshold, FULLCHG output switches high.
Battery charging continues until top-off timeout occurs. See Table 1.
Note 6: After charging is complete, when BATT voltage falls below this threshold, a new charging cycle is initiated.
Note 7: Specifications to -40°C are guaranteed by design, not production tested.
CONTROL INPUTS/OUTPUTS
V0.6V
IL
SHDN Input Voltage Low
V1.4V
IH
SHDN Input Voltage High
Hz0.93 1.37
Temperature Measurement
Frequency
PARAMETER SYMBOL MIN TYP MAX UNITS
BATT Undervoltage Threshold
(Note 3)
2.4 2.6 V/cell
BATT Overvoltage Threshold
(Note 4)
4.55 4.8 V/cell
FULLCHG BATT Current
Termination Threshold (Note 5)
mA
CONDITIONS
CONTROL INPUTS/OUTPUTS