General Description The MAX712 MAX713 fast charge Nickel Metal Hydride NiMH and Nickel Cadmium NiCd batteries from a DC source at least 5V higher than the maximum battery voltage to series cells can be charged at rates up to 4C A voltage slope detecting analog to digital convert er timer and temperature window comparator determine charge completion The MAX712 MAX713 are powered by the DC source via an on board +5V shunt regulator They draw a maximum of 5m A from the battery when not charging A low side current sense resistor allows the battery charge current to be regulated while still supplying power to the battery s load The MAX712 terminates fast charge by detecting zero voltage slope while the MAX713 uses a negative voltage slope detection scheme Both parts come in pin DIP and SO packages An external power PNP tran sistor blocking diode three resistors and three capacitors are the only required external components For high power charging requirements the MAX712 MAX713 can be configured as a switch mode battery charger that minimizes power dissipation Two evaluation kits are available: Order the MAX712EVKIT DIP for quick evaluation of the linear charger and the MAX713EVKIT SO to evaluate the switch mode charger
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General Description The MAX712 MAX713 fast charge Nickel Metal Hydride NiMH and Nickel Cadmium NiCd batteries from a DC source at least 5V higher than the maximum battery voltage to series cells can be charged at rates up to 4C A voltage slope detecting analog to digital convert er timer and temperature window comparator determine charge completion The MAX712 MAX713 are powered by the DC source via an on board +5V shunt regulator They draw a maximum of 5m A from the battery when not charging A low side current sense resistor allows the battery charge current to be regulated while still supplying power to the battery's load The MAX712 terminates fast charge by detecting zero voltage slope while the MAX713 uses a negative voltage slope detection scheme Both parts come in pin DIP and SO packages An external power PNP tran sistor blocking diode three resistors and three capacitors are the only required external components For high power charging requirements the MAX712 MAX713 can be configured as a switch mode battery charger that minimizes power dissipation Two evaluation kits are available: Order the MAX712EVKIT DIP for quick evaluation of the linear charger and the MAX713EVKIT SO to evaluate the switch mode charger

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18 pages
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Description

_______________General Description The MAX712/MAX713 fast charge Nickel Metal Hydride (NiMH) and Nickel Cadmium (NiCd) batteries from a DC source at least 1.5V higher than the maximum battery voltage. 1 to 16 series cells can be charged at rates up to 4C. A voltage-slope detecting analog-to-digital convert- er, timer, and temperature window comparator determine charge completion. The MAX712/MAX713 are powered by the DC source via an on-board +5V shunt regulator. They draw a maximum of 5m A from the battery when not charging. A low-side current-sense resistor allows the battery charge current to be regulated while still supplying power to the battery's load. The MAX712 terminates fast charge by detecting zero voltage slope, while the MAX713 uses a negative voltage-slope detection scheme. Both parts come in 16- pin DIP and SO packages. An external power PNP tran- sistor, blocking diode, three resistors, and three capacitors are the only required external components. For high-power charging requirements, the MAX712/ MAX713 can be configured as a switch-mode battery charger that minimizes power dissipation. Two evaluation kits are available: Order the MAX712EVKIT-DIP for quick evaluation of the linear charger, and the MAX713EVKIT- SO to evaluate the switch-mode charger.

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Extrait

MAX712/MAX713
19-0100; Rev 3; 1/97
NiCd/NiMH Battery
Fast-Charge Controllers
_______________General Description ____________________________Features
The MAX712/MAX713 fast charge Nickel Metal Hydride Fast Charge NiMH or NiCd Batteries
(NiMH) and Nickel Cadmium (NiCd) batteries from a DC Voltage Slope, Temperature, and Timer
source at least 1.5V higher than the maximum battery Fast-Charge Cutoff
voltage. 1 to 16 series cells can be charged at rates up
Charge 1 to 16 Series Cells
to 4C. A voltage-slope detecting analog-to-digital convert-
Supply Battery’s Load while Charging (Linear Mode)er, timer, and temperature window comparator determine
charge completion. The MAX712/MAX713 are powered Fast Charge from C/4 to 4C Rate
by the DC source via an on-board +5V shunt regulator. C/16 Trickle-Charge Rate
They draw a maximum of 5 A from the battery when not
Automatically Switch from Fast to Trickle Chargecharging. A low-side current-sense resistor allows the
Linear or Switch-Mode Power Controlbattery charge current to be regulated while still
supplying power to the battery’s load. 5µA Max Drain on Battery when Not Charging
The MAX712 terminates fast charge by detecting zero 5V Shunt Regulator Powers External Logic
voltage slope, while the MAX713 uses a negative
voltage-slope detection scheme. Both parts come in 16- ______________Ordering Information
pin DIP and SO packages. An external power PNP tran-
PART TEMP. RANGE PIN-PACKAGEsistor, blocking diode, three resistors, and three
capacitors are the only required external components. MAX712CPE 0°C to +70°C 16 Plastic DIP
For high-power charging requirements, the MAX712/ MAX712CSE 16 Narrow SO
MAX713 can be configured as a switch-mode battery MAX712C/D 0°C to +70°C Dice*
charger that minimizes power dissipation. Two evaluation MAX712EPE -40°C to +85°C 16 Plastic DIP
kits are available: Order the MAX712EVKIT-DIP for quick
MAX712ESE 16 Narrow SO
evaluation of the linear charger, and the MAX713EVKIT-
MAX712MJE -55°C to +125°C 16 CERDIP**SO to evaluate the switch-mode charger.
Ordering Information continued at end of data sheet.
________________________Applications *Contact factory for dice specifications.
**Contact factory for availability and processing to MIL-STD-883.
Battery-Powered Equipment
Laptop, Notebook, and Palmtop Computers __________Typical Operating Circuit
Handy-Terminals
Q1
Cellular Phones DC IN
2N6109
Portable Consumer Products
C4 R2Portable Stereos
R1 0.01 F 150
Cordless Phones
DRVTHI__________________Pin Configuration WALL D1
1N4001CUBE
V+
TOP VIEW
C1 VLIMIT BATT+
REFVLIMIT 1 16 1 F REF
BATT+ 2 15 V+ C3
R3 MAX712 10 FBATTERYDRVPGM0 3 14 68k
MAX713
PGM1 4 MAX712 13 GND TEMP
MAX713
LOADTHI 5 12 BATT- R4
10 F CC BATT- TLO GND22k
11 CCTLO 6
TEMP 7 10 PGM3 C2
0.01 F RPGM2 SENSEFASTCHG 8 9
SEE FIGURE 19 FOR SWITCH-MODE CHARGER CIRCUIT.DIP/SO
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
''''W'mm'WWm'm'm'm'
EVALUATION KIT MANUALS
FOLLOW DATA SHEETNiCd/NiMH Battery
Fast-Charge Controllers
ABSOLUTE MAXIMUM RATINGS
V+ to BATT-.................................................................-0.3V, +7V REF Current.........................................................................10mA
BATT- to GND........................................................................±1V Continuous Power Dissipation (T = +70°C)A
BATT+ to BATT- Plastic DIP (derate 10.53mW/°C above +70°C............842mW
Power Not Applied............................................................±20V Narrow SO (derate 8.70mW/°C above +70°C .............696mW
With Power Applied................................The higher of ±20V or CERDIP (derate 10.00mW/°C above +70°C ................800mW
±2V x (programmed cells) Operating Temperature Ranges
DRV to GND ..............................................................-0.3V, +20V MAX71_C_E .......................................................0°C to +70°C
FASTCHG to BATT-...................................................-0.3V, +12V MAX71_E_E .................................................... -40°C to +85°C
All Other Pins to GND......................................-0.3V, (V+ + 0.3V) MAX71_MJE ................................................. -55°C to +125°C
V+ Current.........................................................................100mA Storage Temperature Range .............................-65°C to +150°C
DRV Current......................................................................100mA Lead Temperature (soldering, 10sec) .............................+300°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.
ELECTRICAL CHARACTERISTICS
(I = 10mA, T = T to T , unless otherwise noted. Refer to Typical Operating Circuit. All measurements are with respect toV+ A MIN MAX
BATT-, not GND.)
PARAMETER CONDITIONS MIN TYP MAX UNITS
V+ Voltage 5mA < I < 20mA 4.5 5.5 VV+
I (Note 1) 5 mAV+
BATT+ Leakage V+ = 0V, BATT+ = 17V 5 µA
BATT+ Resistance with Power On PGM0 = PGM1 = BATT-, BATT+ = 30V 30 kΩ
C1 Capacitance 0.5 µF
C2 Capacitance 5 nF
REF Voltage 0mA < I < 1mA 1.96 2.04 VREF
Undervoltage Lockout Per cell 0.35 0.50 V
External VLIMIT Input Range 1.25 2.50 V
THI, TLO, TEMP Input Range 02 V
THI, TLO Offset Voltage (Note 2) 0V < TEMP < 2V, TEMP voltage rising -10 10 mV
THI, TLO, TEMP, VLIMIT Input Bias Current -1 1 µA
1.2V < V < 2.5V, 5mA < I < 20mA,LIMIT DRVVLIMIT Accuracy -30 30 mV
PGM0 = PGM1 = V+
Internal Cell Voltage Limit V = V+ 1.6 1.65 1.7 VLIMIT
Fast-Charge VSENSE 225 250 275 mV
PGM3 = V+ 1.5 3.9 7.0
PGM3 = open 4.5 7.8 12.0
Trickle-Charge VSENSE mV
PGM3 = REF 12.0 15.6 20.0
PGM3 = BATT- 26.0 31.3 38.0
MAX713 -2.5 mV/tAVoltage-Slope Sensitivity (Note 3)
per cellMAX712 0
Timer Accuracy -15 15 %
Battery-Voltage to Cell-Voltage
-1.5 1.5 %
Divider Accuracy
DRV Sink Current V = 10V 30 mADRV
2 _______________________________________________________________________________________
MAX712/MAX713MAX712/MAX713
NiCd/NiMH Battery
Fast-Charge Controllers
ELECTRICAL CHARACTERISTICS (continued)
(I + = 10mA, T = T to T , unless otherwise noted. Refer to Typical Operating Circuit. All measurements are with respect toV A MIN MAX
BATT-, not GND.)
PARAMETER CONDITIONS MIN TYP MAX UNITS
FASTCHG Low Current V = 0.4V 2 mAFASTCHG High Current V = 10V 10 µAFASTCHG
A/D Input Range (Note 4) Battery voltage ÷ number of cells programmed 1.4 1.9 V
Note 1: The MAX712/MAX713 are powered from the V+ pin. Since V+ shunt regulates to +5V, R1 must be small enough to allow at
least 5mA of current into the V+ pin.
Note 2: Offset voltage of THI and TLO comparators referred to TEMP.
Note 3: t is the A/D sampling interval (Table 3).A
Note 4: This specification can be violated when attempting to charge more or fewer cells than the number programmed. To ensure
proper voltage-slope fast-charge termination, the (maximum battery voltage) ÷ (number of cells programmed) must fall
within the A/D input range.
__________________________________________Typical Operating Characteristics
(T = +25°C, unless otherwise noted.)A
CURRENT-SENSE AMPLIFIER CURRENT-SENSE AMPLIFIER
FREQUENCY RESPONSE (with 15pF) FREQUENCY RESPONSE (with 10nF)
20 40 20 40
C2 = 15pF C2 = 10nF
FASTCHG = 0V FASTCHG = 0V
010 10 0
AA VV
0 -40 0 -40
BATT- CC
-80-10 -10 -80
++ CURRENT-
V VIN SENSE OUT
- -AMP
GND BATT-
-120-20 -20 -120
1k 10k 100k 1M 10M 10 100 1k 10k
FREQUENCY (Hz) FREQUENCY (Hz)
CURRENT ERROR-AMPLIFIER SHUNT-REGULATOR VOLTAGE ALPHA THERMISTOR PART No. 13A1002
TRANSCONDUCTANCE STEINHART-HART INTERPOLATIONvs. CURRENT
100 5.8 1.6 35
FASTCHG = 0V, V+ = 5V DRV NOT SINKING CURRENT5.6 1.4 30
5.4
1.2 25
10 5.2
1.0 205.0 DRV SINKING CURRENT
4.8 0.8 15
1 4.6 0.6 10
4.4
0.4 5
4.2
0.1 0.2 04.0
1.95 1.97 1.99 2.01 2.03 2.05 0610 20 30 40 5000610 20 30 40 500
VOLTAGE ON CC PIN (V) BATTERY TEMPERATURE(?C)CURRENT INTO V+ PIN (mA)
_______________________________________________________________________________________ 3
FWF
DRV PIN SINK CURRENT(mA)
GAIN (dB)
MAX712/13 LOG3
V+ VOLTAGE (V)
MAX712/13 LOG1
PHASE (DEGREES)
GAIN (dB)
MAX712/13 LOG4
TEMP PIN VOLTAGE (V)
MAX712/13 LOG2
PHASE (DEGREES)
BATTERY THERMISTOR RESISTANCE (k )NiCd/NiMH Battery
Fast-Charge Controllers
____________________________Typical Operating Characteristics (continued)
(T = +25°C, unless otherwise noted.)A
MAX713MAX713
NiCd BATTERY-CHARGING NiMH BATTERY-CHARGING
CHARACTERISTICS AT C RATECHARACTERISTICS AT C RATE
1.601.55

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