This table shows a comparison between the LTC3675 PMIC and the LTC3589 PMIC. At a high level, the devices have a similar integration level yet the LTC3675 is a more general purpose device, while the LTC3589 is more tailored towards applications processors. Both devices feature a 2.7V to 5.5V operating input voltage range, low quiescent current, high switching frequency,  optional I²C interface control, power-up sequencing, push button on/off control and separate enable pins for the DC/DC converters. The LTC3675 has seven high-efficiency switching rails: four configurable buck regulators, a buck-boost regulator, a boost regulator and an LED driver. The LTC3589 has four switching rails: three buck regulators and a higher-current buck-boost regulator. Both devices have one always-ON 25mA LDO regulator, but the LTC3589 also features three 250mA low-noise LDOs. Separate DC/DC enable pins allow individual on/off control for both devices. Software enable control is also an option. The LTC3589 has more processor-specific hooks than the LTC3675 does; including direct processor support and control such as register mapping for I²C command startup and a Freescale processor-specific standby pin for toggling dynamic voltage scaling. Both devices feature dynamic voltage scaling and DC/DC converter slew rate control. Finally, the devices are both offered in thermally enhanced QFN packages, but the footprints are different; the LTC3675 is packaged in a 4mm x 7mm 44-lead QFN and the LTC3589 is housed in a 6mm x 6mm 40-lead QFN.