
MAX1870A
Step-Up/Step-Down
Li+ Battery Charger
6 _______________________________________________________________________________________
CHARGE-VOLTAGE REGULATION
VCTL Range 0 3.6 V
V
VCTL
= V
LDO
(2 cells)
-0.8
+0.8
-0.8
+0.8
-0.8
+0.8
-1.2
+1.2
-1.2
+1.2
-1.2
+1.2
V
VCTL
= V
REFIN
/ 20 (2 cells)
-1.4
+1.4
V
VCTL
= V
REFIN
/ 20 (3 cells)
-1.4
+1.4
Battery Regulation Voltage
Accuracy
V
VCTL
= V
REFIN
/ 20 (4 cells)
-1.4
+1.4
%
VCTL Default Threshold VCTL rising 4.0 4.2 V
CHARGE-CURRENT REGULATION
ICTL Range 0 3.6 V
V
ICTL
= V
REFIN
66 80
V
ICTL
= V
REFIN x 0.8
53 65
Quick-Charge-Current Accuracy
V
ICTL
= V
REFIN x 0.583
38 48
mV
BATT/CSIP/CSIN Input Voltage
Range
0 19 V
CSIP Input Current
ICTL = REFIN
600
µA
ICTL Power-Down-Mode
Threshold Voltage
REFIN /
100
REFIN /
32
V
CLS = REF 95 115
Charger-Input Current-Limit
Accuracy (V
CSSP
- V
CSSN
)
CSSS = CSSP
CLS = REF x 0.845 79 97
mV
CLS = REF 95 115
System-Input Current-Limit
Accuracy (V
CSSP
- V
CSSS
)
CSSN = CSSP
CLS = REF x 0.845 79 97
mV
CSSP/CSSS/CSSN Input Voltage
Range
8 28 V
CSSP Input Current
V
CSSP
= V
CSSN
= V
CSSS
= V
DCIN
= 8V, 28V
1200
V
REF
/ 2 V
REF
V
IINP Transconductance V
CSSP
- V
CSSS
= 102mV, CSSN = CSSP 2.5 3.1
V
CSSP
- V
CSSN
= 200mV, V
IINP
= 0V
350
IINP Output Current
V
CSSP
- V
CSSS
= 200mV, V
IINP
= 0V
350
µA
V
CSSP
- V
CSSN
= 200mV, IINP float 3.5
IINP Output Voltage
V
CSSP
- V
CSSS
= 200mV, IINP float 3.5
V
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 2, V
DCIN
= V
CSSP
= V
CSSN
= V
CSSS
= V
VHP
= 18V, V
BATT
= V
CSIP
= V
CSIN
= V
BLKP
= 12V, V
REFIN
= 3.0V, V
ICTL
=
0.75 x V
REFIN
, VCTL = LDO, CELLS = FLOAT, GND = PGND = 0, V
DLOV
= 5.4V, T
A
= -40°C to +85°C.) (Note 1)
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