Datasheet

MAX712/MAX713
NiCd/NiMH Battery
Fast-Charge Controllers
2
Maxim Integrated
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(I
V+
= 10mA, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Refer to the Typical Operating Circuit . All measurements are with respect to
BATT-, not GND.)
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.
V+ to BATT- .................................................................-0.3V, +7V
BATT- to GND ........................................................................±1V
BATT+ to BATT-
Power Not Applied............................................................±20V
With Power Applied ................................The higher of ±20V or
±2V x (programmed cells)
DRV to GND ..............................................................-0.3V, +20V
FASTCHG to BATT- ...................................................-0.3V, +12V
All Other Pins to GND......................................-0.3V, (V+ + 0.3V)
V+ Current.........................................................................100mA
DRV Current. .....................................................................100mA
REF Current.........................................................................10mA
Continuous Power Dissipation (T
A
= +70°C)
Plastic DIP (derate 10.53mW/°C above +70°C............842mW
Narrow SO (derate 8.70mW/°C above +70°C .............696mW
CERDIP (derate 10.00mW/°C above +70°C ................800mW
Operating Temperature Ranges
MAX71_C_E .......................................................0°C to +70°C
MAX71_E_E .................................................... -40°C to +85°C
MAX71_MJE ................................................. -55°C to +125°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
V
DRV
= 10V
V+ = 0V, BATT+ = 17V
PGM3 = BATT-
5mA < I
V+
< 20mA
PGM3 = REF
PGM3 = open
PGM3 = V+
0V < TEMP < 2V, TEMP voltage rising
V
LIMIT
= V+
Per cell
PGM0 = PGM1 = BATT-, BATT+ = 30V
1.2V < V
LIMIT
< 2.5V, 5mA < I
DRV
< 20mA,
PGM0 = PGM1 = V+
0mA < I
REF
< 1mA
CONDITIONS
mA30DRV Sink Current
%-1.5 1.5
Battery-Voltage to Cell-Voltage
Divider Accuracy
%-15 15Timer Accuracy
mV
26.0 31.3 38.0
Trickle-Charge VSENSE
12.0 15.6 20.0
4.5 7.8 12.0
1.5 3.9 7.0
mV225 250 275Fast-Charge VSENSE
V1.6 1.65 1.7Internal Cell Voltage Limit
mV-30 30VLIMIT Accuracy
µA-1 1THI, TLO, TEMP, VLIMIT Input Bias Current
µA5BATT+ Leakage
mA5I
V+
(Note 1)
V4.5 5.5V+ Voltage
mV-10 10THI, TLO Offset Voltage (Note 2)
V02THI, TLO, TEMP Input Range
V1.25 2.50External VLIMIT Input Range
V0.35 0.50Undervoltage Lockout
kΩ30BATT+ Resistance with Power On
µF0.5C1 Capacitance
nF5C2 Capacitance
V1.96 2.04REF Voltage
UNITSMIN TYP MAXPARAMETER
MAX712
MAX713
mV/t
A
per cell
0
Voltage-Slope Sensitivity (Note 3)
-2.5