MAX2003

19-0371; Rev 4; 5/97 NUAL KIT MA ATION HEET S A EVALU T A WS D FOLLO NiCd/NiMH Battery Fast-Charge Controllers ____________________________Features o Stand-Alone NiCd or NiMH Fast Chargers o New Pulsed Trickle-Charge Mode (MAX2003A only) o Provide Switch-Mode, Gated, or Linear Control Regulation o Small, Narrow SO Package Available o On-Chip Fast-Charge Termination Methods: Temperature Slope Maximum Voltage Negative Delta Voltage Maximum Time Maximum Temperature o Automatically Switch from Fast-Charge to Trickle-Charge or Top-Off Charge o Optional Discharge-Before-Charge o Directly Drive Status LEDs o Optional Top-Off Charge General Description The MAX2003/MAX2003A are fast-charge battery chargers (with conditioning) for NiCd (nickel cadmium) or NiMH (nickel-metal hydride) rechargeable batteries. The MAX2003A has the same features as the MAX2003 with an additional pulsed trickle-charge mode to prevent dendrite formation in NiMH batteries. Each can be configured as a switch-mode current regulator or as a gating controller for an external current source. Switch-mode current regulation provides efficient energy transfer, reducing power dissipation and the associated heating. Gating control of an external current source requires minimal components, saving space and cost. On-chip algorithms determine charge termination, so the MAX2003/MAX2003A can be used as stand-alone chargers. Fast-charge termination is accomplished by five methods: temperature slope, negative volt...