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File name MAX712-MAX713.pdf

19-0100; Rev 5; 4/02 KIT ATION EVALU ILABLE AVA NiCd/NiMH Battery Fast-Charge Controllers Features o Fast-Charge NiMH or NiCd Batteries o Voltage Slope, Temperature, and Timer Fast-Charge Cutoff o Charge 1 to 16 Series Cells o Supply Battery's Load While Charging (Linear Mode) o Fast Charge from C/4 to 4C Rate o C/16 Trickle-Charge Rate o Automatically Switch from Fast to Trickle Charge o Linear or Switch-Mode Power Control o 5µA (max) Drain on Battery when Not Charging o 5V Shunt Regulator Powers External Logic 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 converter, 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 5µA 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 16pin DIP and SO packages. An external power PNP transistor, 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 MAX713EVKITSO to evaluate the switch-mode charger. MAX712/MAX713 Ordering Information PART MAX712CPE MAX712CSE MAX712C/D MAX712EPE MAX712ESE MAX712MJE TEMP RANGE 0°C to +70°C 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C -55°C to +125°C PIN-PACKAGE 16 Plastic DIP 16 Narrow SO Dice* 16 Plastic DIP 16 Narrow SO 16 CERDIP** ________________________Applications Battery-Powered Equipment Laptop, Notebook, and Palmtop Computers Handy-Terminals Cellular Phones Portable Consumer Products Portable Stereos Cordless Phones Ordering Information continued at end of data sheet. *Contact factory for dice specifications. **Contact factory for availability and processing to MIL-STD-883. Typical Operating Circuit DC IN C4 0.01µF Q1 2N6109 R2 150 R1 Pin Configuration TOP VIEW VLIMIT 1 BATT+ 2 PGM0 3 PGM1 4 THI 5 TLO 6 TEMP 7 FASTCHG 8 16 REF 15 V+ 14 DRV C1 1µF R3 68k TEMP 10µF R4 22k LOAD CC BATT- TLO GND C2 0.01µF VLIMIT REF BATT+ C3 10µF WALL CUBE THI V+ DRV D1 1N4001 MAX712 MAX713 13 GND 12 BATT11 CC 10 PGM3 9 PGM2 MAX712 MAX713 BATTERY RSENSE DIP/SO SEE FIGURE 19 FOR SWITCH-MODE CHARGER CIRCUIT. ________________________________________________________________ Maxim Integrated Products 1 For pricing, delivery, and ordering information,