Rainbow Electronics MAX8724 User Manual
Page 2
MAX1908/MAX8724
Low-Cost Multichemistry Battery Chargers
2
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ABSOLUTE MAXIMUM RATINGS
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
= 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, CSSN,
ACOK to GND.......................-0.3V to +30V
BST to GND ............................................................-0.3V to +36V
BST to LX..................................................................-0.3V to +6V
DHI to LX ...................................................-0.3V to (V
BST
+ 0.3V)
LX to GND .................................................................-6V to +30V
BATT, CSIP, CSIN to GND .....................................-0.3V to +20V
CSIP to CSIN or CSSP to CSSN or PGND
to GND...............................................................-0.3V to +0.3V
CCI, CCS, CCV, DLO, ICHG,
IINP, ACIN, REF to GND...........................-0.3V to (V
LDO
+ 0.3V)
DLOV, VCTL, ICTL, REFIN, CELLS, CLS,
LDO, SHDN to GND .................................................-0.3V to +6V
DLOV to LDO.........................................................-0.3V to +0.3V
DLO to PGND .........................................-0.3V to (V
DLOV
+ 0.3V)
LDO Short-Circuit Current...................................................50mA
Continuous Power Dissipation (T
A
= +70°C)
28-Pin Thin QFN (5mm × 5mm)
(derate 20.8mW/°C above +70°C) .........................1666.7mW
Operating Temperature Range ..........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-60°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
CHARGE VOLTAGE REGULATION
V
VCTL
= V
REFIN
(2, 3, or 4 cells)
-0.5
+0.5
V
VCTL
= V
REFIN
/ 20 (2, 3, or 4 cells)
-0.5
+0.5
Battery Regulation Voltage
Accuracy
V
VCTL
= V
LDO
(2, 3, or 4 cells)
-0.5
+0.5
%
VCTL Default Threshold
V
VCTL
rising
4.0
4.1
4.2
V
REFIN Range
(Note 1)
2.5
3.6
V
REFIN Undervoltage Lockout
V
REFIN
falling
1.20
1.92
V
CHARGE CURRENT REGULATION
CSIP-to-CSIN Full-Scale Current-
Sense Voltage
V
ICTL
= V
REFIN
71.25
75
78.75
mV
V
ICTL
= V
REFIN
-5
+5
V
ICTL
= V
REFIN
x 0.6
-5
+5
Charging Current Accuracy
V
ICTL
= V
LDO
-6
+6
%
ICTL Default Threshold
V
ICTL
rising
4.0
4.1
4.2
V
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
400
650
µA
Cycle-by-Cycle Maximum Current
Limit
I
MAX
RS2 = 0.015
Ω
6.0
6.8
7.5
A
ICTL Power-Down Mode
Threshold Voltage
V
ICTL
rising
REFIN /
100
REFIN /
55
REFIN /
33
V
V
VCTL
= V
ICTL
= 0 or 3V
-1
+1
ICTL, VCTL Input Bias Current
V
DCIN
= 0, V
VCTL
= V
ICTL
= V
REFIN
= 5V
-1
+1
µA