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 0.1 1
CSSN Input Current
(MAX8765/MAX8765A Only)
V
CSSP
= V
CSSN
= 28V
V
DCIN
= 28V 0.1 1
µA
CLS Input Range
(MAX1908/MAX8724 Only)
1.6 REF V
CLS Input Range
(MAX8765/MAX8765A Only)
1.1 REF V
CLS Input Bias Current V
CLS
= 2V -1 +1 µA
IINP Transconductance
(MAX1908/MAX8724 Only)
G
IINP
V
CSSP
- V
CSSN
= 75mV 2.7 3 3.3 µA/mV
V
CSSP
- V
CSSN
= 75mV -5 +5
IINP Accuracy
V
CSSP
- V
CSSN
= 37.5mV -7.5 +7.5
%
IINP Transconductance
(MAX8765/MAX8765A Only)
G
IINP
V
CSSP
- V
CCSN
= 75mV 2.82 3 3.18 µA/mV
IINP Transconductance Error
(MAX8765/MAX8765A Only)
-6 +6 %
IINP Transconductance Offset
(MAX8765/MAX8765A Only)
-10 +10 µA
IINP Output Current V
CSSP
- V
CSSN
= 150mV, V
IINP
= 0V 350 µA
IINP Output Voltage V
CSSP
- V
CSSN
= 150mV, V
IINP
= open 3.5 V
SUPPLY AND LDO REGULATOR
DCIN Input Voltage Range V
DCIN
8 28 V
V
DCIN
falling 7 7.4
DCIN Undervoltage-Lockout Trip
Point
V
DCIN
rising 7.5 7.85
V
DCIN Quiescent Current I
DCIN
8.0V < V
DCIN
< 28V 3.2 6 mA
V
BATT
= 19V, V
DCIN
= 0V 1
BATT Input Current I
BATT
V
BATT
= 2V to 19V, V
DCIN
= 19.3V 200 500
µA
LDO Output Voltage 8V < V
DCIN
< 28V, no load 5.25 5.4 5.55 V
LDO Load Regulation 0 < I
LDO
< 10mA 34 100 mV
LDO Undervoltage-Lockout Trip
Point
V
DCIN
= 8V 3.20 4 5.15 V
REFERENCE
REF Output Voltage 0 < I
REF
< 500µA 4.072 4.096 4.120 V
REF Undervoltage-Lockout Trip
Point
V
REF
falling 3.1 3.9 V
MAX1908/MAX8724/MAX8765/MAX8765A
4
Maxim Integrated