The ISL6411 is an ultra low noise triple output LDO regulator with microprocessor reset circuit and is optimized for powering wireless chip sets. The IC accepts an input voltage range of 3.0V to 3.6V and provides three regulated output voltages: 1.8V (LDO1), 2.84V (LDO2), and another ultra clean 2.84V (LDO3). On chip logic provides sequencing between LDO1 and LDO2 for BBP/MAC and I/O supply voltage outputs. LDO3 features ultra low noise that does not typically exceed 30µV RMS to aid VCO stability. High integration and the thin Quad Flat No-lead (QFN) package makes ISL6411 an ideal choice to power many of today’s small form factor industry standard wireless cards, such as PCMCIA, mini-PCI and Cardbus-32.

Features

• Small DC-DC Converter Size

- Three LDOs and RESET Circuitry in a Low-Profile 4x4mm QFN Package

• High Output Current

- LDO1, 1.8V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500mA

- LDO2, 2.84V. . . . . . . . . . . . . . . . . . . . . . . . . . . . 300mA

- LDO3, 2.84V. . . . . . . . . . . . . . . . . . . . . . . . . . . . 200mA

• Ultra-Low Dropout Voltage

- LDO2, 2.84V. . . . . . . . . . . . . . . 125mV (typ.) at 300mA

- LDO3, 2.84V. . . . . . . . . . . . . . . 100mV (typ.) at 200mA

• Ultra-Low Output Voltage Noise

- <30µVRMS (typ.) for LDO3 (VCO Supply)

• Stable with Smaller Ceramic Output Capacitors

• Voltage Sequencing for BBP/MAC and Analog Supplies

• Extensive Protection and Monitoring Features

- Over current protection

- Short circuit protection

- Thermal shutdown

- Reverse battery protection

- FAULT indicator

• Logic-Controlled Dual Shutdown Pins

• Integrated Microprocessor Reset Circuit

- Programmable Reset Delay

- Complimentary Reset Outputs

• Proven Reference Design for Total WLAN System Solution

• QFN Package Option

- Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat No Leads - Product Outline

- Near Chip-Scale Package Footprint Improves PCB Efficiency and Is Thinner in Profile

- Lead-Free Package Option Available (Z suffix)

Applications

• PRISM® 3, PRISM GT™, and PRISM WWR Chipsets

• WLAN Cards

- PCMCIA, Cardbus32, MiniPCI Cards

- Compact Flash Cards

• Hand-Held Instruments