New Industry Products

ON Semi Debuts New CMOS Charge Pump Voltage Converters, the MAX1720 and NCP1729

March 18, 2001 by Jeff Shepard

ON Semiconductor (Phoenix, AZ) has unveiled two CMOS charge pump voltage converters available in the TSOP-6 package. The new MAX1720 and NCP1729 switched capacitor voltage inverters are low-frequency devices that invert and/or double an input voltage ranging from 1.15V to 5.5V with a conversion efficiency rating typically greater than 99 percent and a power-conversion efficiency of 96 percent. They are suitable for use in portable battery-powered applications such as LCD panels, cell phones, electronic games, camcorders and handheld instruments.

The MAX1720 and NCP1729 require two capacitors for voltage-inverter functions and two diodes and three capacitors for voltage-doubling functions. The operating current consumption for the MAX1720 is 67 mA and 122mA for the NCP1729. This quiescent current, coupled with the shutdown feature, allow the devices to conserve power by reducing the supply current to 0.4mA.

Both charge pumps supply an output current in excess of 50 milliAmperes. The MAX1720 and the NCP1729 contain a switching frequency of 12kHz and 35kHz, respectively, that drives four integrated resistance MOSFET switches.

The MAX1720 and NCP1729 have a suggested resale price of $0.49 each in 12,000-unit quantities.