Rainbow Electronics MAX8724 - Manual (Page 6)

MAX1908/MAX8724
Low-Cost Multichemistry Battery Chargers
6 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS
(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 = FLOAT, 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 = -40°C to +85°C, unless otherwise noted.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
CHARGE VOLTAGE REGULATION
V VCTL = V REFIN (2, 3, or 4 cells) -0.6 +0.6
V VCTL = V REFIN / 20 (2, 3, or 4 cells) -0.6 +0.6
Battery Regulation Voltage
Accuracy
V VCTL = V LDO (2, 3, or 4 cells) -0.6 +0.6
%
REFIN Range (Note 1) 2.5 3.6 V
REFIN Undervoltage Lockout V REFIN falling 1.92 V
CHARGE CURRENT REGULATION
CSIP-to-CSIN Full-Scale Current-
Sense Voltage
V ICTL = V REFIN 70.5 79.5 mV
V ICTL = V REFIN -6 +6
V ICTL = V REFIN
×
0.6 -7.5 +7.5 Charging Current Accuracy
V ICTL = V LDO -7.5 +7.5
%
BATT/CSIP/CSIN Input Voltage
Range
0 19 V
V DCIN = 0 or V ICTL = 0 or SHDN = 0 1
CSIP/CSIN Input Current
Charging 650
µA
Cycle-by-Cycle Maximum Current
Limit
I MAX RS2 = 0.015 Ω 6.0 7.5 A
ICTL Power-Down Mode
Threshold Voltage
V ICTL rising
REFIN /
100
REFIN /
33
V
ICHG Transconductance G ICHG V CSIP - V CSIN = 45mV 2.7 3.3 µA/mV
V CSIP - V CSIN = 75mV -7.5 +7.5
V CSIP - V CSIN = 45mV -7.5 +7.5 ICHG Accuracy
V CSIP - V CSIN = 5mV -40 +40
%
INPUT CURRENT REGULATION
CSSP-to-CSSN Full-Scale
Current-Sense Voltage
71.25 78.75 mV
V CLS = V REF -5 +5
Input Current-Limit Accuracy
V CLS = V REF / 2 -7.5 +7.5
%
CSSP, CSSN Input Voltage
Range
8 28 V
V DCIN = 0 1
CSSP, CSSN Input Current
V CSSP = V CSSN = V DCIN > 8V 600
µA
CLS Input Range 1.6 REF V
IINP Transconductance G IINP V CSSP - V CSSN = 75mV 2.7 3.3 µA/mV
V CSSP - V CSSN = 75mV -7.5 +7.5
IINP Accuracy
V CSSP - V CSSN = 37.5mV -7.5 +7.5
%