MAX745
Switch-Mode Lithium-Ion
Battery Charger
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
DCIN
= 18V, V
BATT
= 8.4V, TA= 0°C to +85°C. Typical values are at TA= +25°C, unless otherwise noted.)
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 to GND............................................................-0.3V to 26V
BST, DHI to GND......................................................-0.3V to 30V
BST to LX....................................................................-0.3V to 6V
DHI to LX............................................(LX - 0.3V) to (BST + 0.3V)
LX to GND................................................-0.3V to (DCIN + 0.3V)
VL to GND...................................................................-0.3V to 6V
CELL0, CELL1, IBAT, STATUS, CCI, CCV,
REF, SETI, VADJ, DLO, THM/
SHDN to GND ..-0.3V to (VL + 0.3V)
BATT, CS to GND .....................................................-0.3V to 20V
PGND to GND..........................................................-0.3V to 0.3V
VL Current...........................................................................50mA
Continuous Power Dissipation (T
A
= +70°C)
SSOP (derate 8.00mW/°C above +70°C) ......................640mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature.........................................-60°C to +150°C
Lead Temperature (soldering, 10sec).............................+300°C
6.0V < V
DCIN
< 24V, logic inputs = VL
VL < 3.2V, VCS= 12V
VL < 3.2V, V
BATT
= 12V
Output high or low
0 < I
REF
< 1mA
6.0V < V
DCIN
< 24V, no load
TA= +25°C
Output high or low
CONDITIONS
V019BATT, CS Input Voltage Range
µA
5
CS Input Current
µA
5
BATT Input Current
Ω
614DLO On-Resistance
Ω
47DHI On-Resistance
mA46DCIN Quiescent Supply Current
V624DCIN Input Voltage Range
% 89 93DHI Maximum Duty Cycle
kHz270 300 330Oscillator Frequency
mV/mA10 20REF Output Load Regulation
V5.15 5.40 5.65VL Output Voltage
V
4.17 4.2 4.23
REF Output Voltage
UNITSMIN TYP MAXPARAMETER
4V < V
BATT
< 16V
6.0V < V
DCIN
< 24V
mV±1.5CS to BATT Offset Voltage (Note 1)
SETI = V
REF
(full scale)
mV
170 185 205
CS to BATT
Current-Sense Voltage
Not including VADJ resistor tolerance
%
-0.65 0.65
Absolute Voltage Accuracy
With 1% tolerance VADJ resistors
4.16 4.2 4.24
-0.75 0.75
SWITCHING REGULATOR
SUPPLY AND REFERENCE
VL > 5.15V, V
BATT
= 12V
VL > 5.15V, VCS= 12V 400
500
SETI = 400mV 14 18 22