The ISL6411 is an ultra-low noise triple output LDO regulator with microprocessor reset circuit and optimized to power wireless chipsets. The IC accepts input voltages ranging from 3.0V to 3.6V and provides three regulated output voltages: 1.8V (LDO1), 2.84V (LDO2), and an extra clean 2.84V (LDO3). On-chip logic provides sequencing voltage outputs between LDO1 and BBP/MAC and I/O power supply LDO2. LDO3 features ultra-low noise that does not typically exceed 30µVRMS to help VCO stability. The high integration and low profile Quad Flat No-Lead (QFN) package makes the ISL6411 an ideal choice for many of today's miniaturized industry standard wireless cards such as PCMCIA, Mini PCI and Cardbus-32. The ISL6411 is used as a pass-through device with an internal PMOS transistor. The SHDN pin controls the LDO1 and LDO2 outputs and SHDN3 controls the LDO3 output. Internal voltage sequencing ensures that the LDO1 output (1.8V supply) is always stable when LDO2 is turned on. When the power supply is down, the LDO1 output goes out before the power supply LDO2 is removed. The ISL6411 also integrates a reset function, thus eliminating the need for an additional reset IC required in WLAN applications. The IC asserts a RESET whenever the signal VIN supply voltage drops below a preset threshold and remains asserted for at least 25 ms after the input voltage rises above the reset threshold. An output fault detection circuit indicates three outputs for any regulatory loss. Other features include overcurrent protection, thermal shutdown and reverse battery protection.