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ISL6411
November 2003
FN9081.2
Triple Output, Low-Noise LDO Regulator
with Integrated Reset Circuit
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 30碌V 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鈥檚
small form factor industry standard wireless cards, such as
PCMCIA, mini-PCI and Cardbus-32.
The ISL6411 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 ISL6411 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 any of the
three outputs. Other features include an over current
protection, thermal shutdown and reverse battery protection.
Features
鈥?Small DC-DC Converter Size
- Three LDOs and RESET Circuitry in a Low-Profile
4x4mm QFN Package
鈥?High Output Current
- LDO1, 1.8V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500mA
- LDO2, 2.84V. . . . . . . . . . . . . . . . . . . . . . . . . . . . 300mA
- LDO3, 2.84V. . . . . . . . . . . . . . . . . . . . . . . . . . . . 200mA
鈥?Ultra-Low Dropout Voltage
- LDO2, 2.84V. . . . . . . . . . . . . . . 125mV (typ.) at 300mA
- LDO3, 2.84V. . . . . . . . . . . . . . . 100mV (typ.) at 200mA
鈥?Ultra-Low Output Voltage Noise
- <30碌V
RMS
(typ.) for LDO3 (VCO Supply)
鈥?Stable with Smaller Ceramic Output Capacitors
鈥?Voltage Sequencing for BBP/MAC and Analog Supplies
鈥?Extensive Protection and Monitoring Features
- Over current protection
- Short circuit protection
- Thermal shutdown
- Reverse battery protection
- FAULT indicator
鈥?Logic-Controlled Dual Shutdown Pins
鈥?Integrated Microprocessor Reset Circuit
- Programmable Reset Delay
- Complimentary Reset Outputs
鈥?Proven Reference Design for Total WLAN System
Solution
鈥?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)
Ordering Information
PART NUMBER
ISL6411IR
ISL6411IRZ (Note)
TEMP. RANGE
(
o
C)
-40 to +85
-40 to +85
PACKAGE
16 Ld QFN
16 Ld QFN
PKG.
DWG. #
L16.4x4
L16.4x4
NOTE: " Z " Suffix: Intersil Lead Free products employ special lead
free material sets; molding compounds/die attach materials and
100% matte tin plate termination finish, which is compatible with both
SnPb and lead free soldering operations. Intersil Lead Free products
are MSL classified at lead free peak reflow temperatures that meet
or exceed the lead free requirements of IPC/JEDEC J Std-020B.
Tape and Reel available. Add 鈥?T鈥?suffix for tape and reel packing
option (e.g., ISL6411RZ-T for lead free tape and reel).
Applications
鈥?PRISM庐 3, PRISM GT鈩? and PRISM WWR Chipsets
鈥?WLAN Cards
- PCMCIA, Cardbus32, MiniPCI Cards
- Compact Flash Cards
鈥?Hand-Held Instruments
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CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
|
Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright 漏 Intersil Americas Inc. 2003. All Rights Reserved. PRISM庐 3 and PRISM GT鈩?are trademarks of GlobespanVirata, Inc.
All other trademarks mentioned are the property of their respective owners.
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