ISL6414

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
<30V^_RMS (typ.) for LDO3 (VCO Supply)
Stable with Smaller Ceramic Output Capacitors
Voltage Sequencing for BBP/MAC and Analog Supplies
Extensive Protection and Monitoring Features
-Overcurrent and 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
Pb-Free Plus Anneal Available (RoHS Compliant)

Application

PRISM^® 3, PRISM GT^TM, and PRISM WWR Chips
WLAN Cards
-PCMCIA, Cardbus32, MiniPCI Cards
-Compact Flash Cards
Hand-Held Instruments




Pinout






Specifications

V_IN , SHDN/SHDN3 to GND/GND3 . . . . . . . . . . . . -7.0V to 7.0V
SET, CC, FAULT to GND/GND3 . . . . . . . . . . . . . .. -0.3V to 7.0V
Output Current (Continuous)
-LDO1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500mA
-LDO2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . 300mA
-LDO3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . 200mA
ESD Classification. . . . . . . . . . . . . . . . . . . . . . . . . . . .. .Class 1





Description

The ISL6414 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 30V RMS to aid VCO stability. High integration and the thin Quad Flat No-lead (QFN) package makes ISL6414 an ideal choice to power many of todays small form factor industry standard wireless cards, such as PCMCIA, mini-PCI and Cardbus-32. The ISL6414 uses an internal PMOS transistor as the pass device. The SHDN pin controls LDO1 and LDO2 outputs whereas SHDN3 controls LDO3 output. Internal voltage sequencing insures that LDO1 output (1.8V supply) is always stabilized before LDO2 is turned on. When powering down, power to the LDO2 is removed before the LDO1 output goes off. The ISL6414 also integrates RESET function, which eliminates the need for additional RESET IC required in WLAN applications. The IC asserts a RESET signal whenever the VIN supply voltage drops below a preset threshold, keeping it asserted for at least 25ms after VIN has risen above the reset threshold. An output fault detection circuit indicates loss of regulation on LDO1. Other features include an overcurrent protection, thermal shutdown and reverse battery protection.