Datasheet
Low-Cost Multichemistry Battery Chargers
ELECTRICAL CHARACTERISTICS (continued)
(V
DCIN
= V
CSSP
= V
CSSN
= 18V, V
BATT
= V
CSIP
= V
CSIN
= 12V, V
REFIN
= 3V, V
VCTL
= V
ICTL
= 0.75 x V
REFIN
, CELLS = open, CLS =
REF, V
BST
- V
LX
= 4.5V, ACIN = GND = PGND = 0, C
LDO
= 1µF, LDO = DLOV, C
REF
= 1µF; CCI, CCS, and CCV are compensated
per Figure 1a; T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
V
DCIN
= 0V or V
ICTL
= 0V or V
SHDN
= 0V
1
CSIP/CSIN Input Current
Charging 400
650
µA
Cycle-by-Cycle Maximum Current
Limit
RS2 = 0.015mΩ 6.0 6.8 7.5
A
ICTL Power-Down Mode
Threshold Voltage
(MAX1908/MAX8724 Only)
V
VCTL
rising
REFIN/
100
REFIN/
55
REFIN/
33
V
V
VCTL
= V
ICTL
= 0 or 3V -1 +1
ICTL, VCTL Input Bias Current
V
DCIN
= 0V, V
VCTL
= V
ICTL
= V
REFIN
= 5V -1 +1
µA
V
DCIN
= 5V, V
REFIN
= 3V -1 +1
REFIN Input Bias Current
V
REFIN
= 5V -1 +1
µA
ICHG Transconductance
(MAX1908/MAX8724 Only)
G
ICHG
V
CSIP
- V
CSIN
= 45mV 2.7 3 3.3 µA/mV
ICHG Transconductance
(MAX8765/MAX8765A Only)
G
ICHG
V
CSIP
- V
CSIN
= 45mV 2.85 3 3.15 µA/mV
ICHG Transconductance Error
(MAX8765/MAX8765A Only)
-5 +5 %
ICHG Transconductance Offset
(MAX8765/MAX8765A Only)
-5 +5 µA
V
CSIP
- V
CSIN
= 75mV -6 +6
V
CSIP
- V
CSIN
= 45mV -5 +5 ICHG Accuracy
V
CSIP
- V
CSIN
= 5mV -40 +40
%
ICHG Output Current V
CSIP
- V
CSIN
= 150mV, V
ICHG
= 0V 350 µA
ICHG Output Voltage V
CSIP
- V
CSIN
= 150mV, ICHG
= open 3.5 V
INPUT-CURRENT REGULATION
CSSP-to-CSSN Full-Scale
Current-Sense Voltage
72 75 78 mV
V
CLS
= V
REF
-4 +4
V
CLS
= V
REF
/2 -7.5 +7.5
Input Current-Limit Accuracy
V
CLS
= 1.1V (MAX8765/MAX8765A only) -10 +10
%
Input Current-Limit Gain Error
(MAX8765/MAX8765A Only)
-2 +2 %
Input Current-Limit Offset
(MAX8765/MAX8765A Only)
-2 +2 mV
CSSP, CSSN Input Voltage
Range
8 28 V
V
DCIN
= 0V 0.1 1
CSSP, CSSN Input Current
(MAX1908/MAX8724 Only)
V
CSSP
= V
CSSN
= V
DCIN
> 8V 350 600
µA
V
DCIN
= 0V 0.1 1
CSSP Input Current
(MAX8765/MAX8765A Only)
V
CSSP
= V
CSSN
= 28V
V
DCIN
= 28V
400 650
µA
Maxim Integrated
3
MAX1908/MAX8724/MAX8765/MAX8765A