Max1870a step-up/step-down li+ battery charger – Rainbow Electronics MAX1870A User Manual
Page 2
MAX1870A
Step-Up/Step-Down
Li+ Battery Charger
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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
= 0°C to +85°C, unless otherwise noted. Typical
values are at T
A
= +25°C.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
DCIN, CSSP, CSSS, CSSN,
VHP, VHN, DHI to GND ......................................-0.3V to +30V
VHP, DHI to VHN .....................................................-0.3V to +6V
BATT, CSIP, CSIN, BLKP to GND ..........................-0.3V to +20V
CSIP to CSIN, CSSP to CSSN,
CSSP to CSSS, PGND to GND ..........................-0.3V to +0.3V
CCI, CCS, CCV, REF, IINP to GND ..........-0.3V to (V
LDO
+ 0.3V)
DBST to GND..........................................-0.3V to (V
DLOV
+ 0.3V)
DLOV, VCTL, ICTL, REFIN, CELLS,
CLS, LDO, ASNS,
SHDN to GND .........................-0.3V to +6V
LDO Current........................................................................50mA
Continuous Power Dissipation (T
A
= +70°C)
32-Pin Thin QFN 5mm x 5mm
(derate 21mW/°C above +70°C) ......................................1.7W
Operating Temperature Range
MAX1870AETJ .................................................-40°C to +85°C
Storage Temperature Range .............................-60°C to +150°C
Lead Temperature (soldering, 10s) ................................ +300°C
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
CHARGE-VOLTAGE REGULATION
VCTL Range
0
3.6
V
V
VCTL
= V
LDO
(2 cells)
-0.5
+0.5
V
VCTL
= V
LDO
(3 cells)
-0.5
+0.5
V
VCTL
= V
LDO
(4 cells)
-0.5
+0.5
V
VCTL
= V
REFIN
(2 cells)
-0.8
+0.8
V
VCTL
= V
REFIN
(3 cells)
-0.8
+0.8
V
VCTL
= V
REFIN
(4 cells)
-0.8
+0.8
V
VCTL
= V
REFIN
/ 20 (2 cells)
-1.2
+1.2
V
VCTL
= V
REFIN
/ 20 (3 cells)
-1.2
+1.2
Battery Regulation Voltage
Accuracy
V
VCTL
= V
REFIN
/ 20 (4 cells)
-1.2
+1.2
%
VCTL Default Threshold
VCTL rising
4.0
4.1
4.2
V
0 < V
VCTL
< V
REFIN
-1
+1
DCIN = 0, V
REFIN
= V
VCTL
= 3.6V
-1
+1
VCTL Input Bias Current
VCTL = DCIN = 0, V
REFIN
= 3.6V
-1
+1
µA
CHARGE-CURRENT REGULATION
ICTL Range
0
3.6
V
V
ICTL
= V
REFIN
67
73
79
V
ICTL
= V
REFIN
x 0.8
54
59
64
Quick-Charge-Current Accuracy
V
ICTL
= V
REFIN
x 0.583
39
43
47
mV
Trickle-Charge-Current Accuracy
V
ICTL
= V
REFIN
x 0.0625
3.0
4.5
6.0
mV
BATT/CSIP/CSIN Input Voltage
Range
0
19
V
DCIN = 0
0.1
2
ICTL = 0
0.1
2
CSIP Input Current
ICTL = REFIN
350
600
µA