Datasheet

MAX1758
Stand-Alone, Switch-Mode
Li+ Battery Charger with Internal 28V Switch
4
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
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
CONDITIONS
% of
V
BATTR
x cell
94 95 96
BATT Recharge Voltage
Threshold (Note 6)
mA250 330 400
FULLCHG BATT Current
Termination Threshold (Note 5)
V/cell4.55 4.67 4.8
BATT Overvoltage Threshold
(Note 4)
V/cell2.4 2.5 2.6
BATT Undervoltage Threshold
(Note 3)
UNITSMIN TYP MAXSYMBOLPARAMETER
TIMER1 and TIMER2
Oscillation Frequency
2.1 2.33 2.6 kHz
Prequalification Timer 6.25 7.5 8.75
Fast-Charge Timer 81 90 100
Full-Charge Timer 81 90 100
Top-Off Timer 40.5 45 49.8
Temperature Measurement
Frequency
0.98 1.12 1.32 Hz
SHDN Input Voltage High
V
IH
1.4 V
SHDN Input Voltage Low
V
IL
0.6 V
VADJ, ISETIN, ISETOUT Input
Voltage Range
0V
REF
V
V
VADJ
, V
ISETIN
, V
ISETOUT
= 0 or 4.2V nA
SHDN Input Bias Current
V
SHDN
= 0 or V
VL
-1 1 µA
ISETOUT Shutdown Threshold
Voltage (Note 3)
150 220 300 mV
CELL Input Bias Current V
CELL
= 0 or V
VL
-5 5 µA
VADJ, ISETIN, ISETOUT Input
Bias Current
CELL Input Voltage
For 1 cell 0 0.5
For 3 cells V
REF
- 0.3 V
REF
+ 0.3
For 2 cells (floating) 1.5 2.5
-50 50
CONTROL INPUTS/OUTPUTS
min
min
min
min
V
V
VL
- 0.4 V
VL
For 4 cells