EVALUATION KIT AVAILABLE MAX712/MAX713 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 Batterys Load While Charging er, timer, and temperature window comparator determine (Linear Mode) charge completion. The MAX712/MAX713 are powered by the DC source via an on-board +5V shunt regulator. Fast Charge from C/4 to 4C Rate They draw a maximum of 5A from the battery when not C/16 Trickle-Charge Rate charging. A low-side current-sense resistor allows the Automatically Switch from Fast to Trickle Charge battery charge current to be regulated while still Linear Mode Power Control supplying power to the batterys load. 5A (max) Drain on Battery when Not Charging The MAX712 terminates fast charge by detecting zero voltage slope, while the MAX713 uses a negative 5V Shunt Regulator Powers External Logic voltage-slope detection scheme. Both parts come in 16- pin DIP and SO packages. An external power PNP tran- Ordering Information sistor, blocking diode, three resistors, and three capacitors are the only required external components. PART TEMP RANGE PIN-PACKAGE The evaluation kit is available: Order the MAX712EVKIT- MAX712CPE 0C to +70C 16 Plastic DIP DIP for quick evaluation of the linear charger. MAX712CSE 0C to +70C 16 Narrow SO MAX712C/D 0C to +70C Dice* Applications MAX712EPE -40C to +85C 16 Plastic DIP Battery-Powered Equipment MAX712ESE -40C to +85C 16 Narrow SO Laptop, Notebook, and Palmtop Computers MAX712MJE -55C to +125C 16 CERDIP** Handy-Terminals Ordering Information continued at end of data sheet. Cellular Phones *Contact factory for dice specifications. Portable Consumer Products **Contact factory for availability and processing to MIL-STD-883. Portable Stereos Cordless Phones Typical Operating Circuit Q1 DC IN 2N6109 C4 R2 R1 150 0.01F Pin Configuration THI DRV D1 WALL TOP VIEW 1N4001 CUBE V+ VLIMIT 16 REF 1 C1 VLIMIT BATT+ BATT+ 2 15 V+ 1F REF DRV PGM0 3 14 C3 R3 MAX712 10F MAX712 BATTERY 68k MAX713 PGM1 4 13 GND MAX713 TEMP BATT- THI 5 12 LOAD R4 TLO 11 CC 6 10F CC BATT- TLO GND 22k TEMP 7 10 PGM3 C2 PGM2 FASTCHG 8 9 0.01F R SENSE DIP/SO For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maximintegrated.com. 19-0100 Rev 7 7/13MAX712/MAX713 NiCd/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 = +70C) A BATT+ to BATT- Plastic DIP (derate 10.53mW/C above +70C............842mW Power Not Applied............................................................20V Narrow SO (derate 8.70mW/C above +70C .............696mW With Power Applied................................The higher of 20V or CERDIP (derate 10.00mW/C above +70C ................800mW 2V x (programmed cells) Operating Temperature Ranges DRV to GND ..............................................................-0.3V, +20V MAX71 C E .......................................................0C to +70C FASTCHG to BATT-...................................................-0.3V, +12V MAX71 E E .................................................... -40C to +85C All Other Pins to GND......................................-0.3V, (V+ + 0.3V) MAX71 MJE ................................................. -55C to +125C V+ Current.........................................................................100mA Storage Temperature Range .............................-65C to +150C DRV Current......................................................................100mA Lead Temperature (soldering, 10s) .................................+300C 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 the Typical Operating Circuit. All measurements are with respect to V+ A MIN MAX BATT-, not GND.) PARAMETER CONDITIONS MIN TYP MAX UNITS V+ Voltage 5mA < I < 20mA 4.5 5.5 V V+ I (Note 1) 5 mA V+ BATT+ Leakage V+ = 0V, BATT+ = 17V 5 A BATT+ Resistance with Power On PGM0 = PGM1 = BATT-, BATT+ = 30V 30 k C1 Capacitance 0.5 F C2 Capacitance 5 nF REF Voltage 0mA < I < 1mA 1.96 2.04 V REF 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 A 1.2V < V < 2.5V, 5mA < I < 20mA, LIMIT DRV VLIMIT Accuracy -30 30 mV PGM0 = PGM1 = V+ Internal Cell Voltage Limit V = V+ 1.6 1.65 1.7 V LIMIT 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/t A Voltage-Slope Sensitivity (Note 3) per cell MAX712 0 Timer Accuracy -15 15 % Battery-Voltage to Cell-Voltage -1.5 1.5 % Divider Accuracy DRV Sink Current V = 10V 30 mA DRV 2 Maxim Integrated