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
Max Drain
_______________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.
- charge time
- max712
- fast-charge controllers
- max713
- trickle-charge vsense
- nimh battery
- external components
- current