1
FN9128.1
ISL6414
Triple Output, Low-Noise LDO Regulator
with Integrated Reset Circuit
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 30μV 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 today’s
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 V
IN
supply voltage drops below a preset
threshold, keeping it asserted for at least 25ms after V
IN
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.
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
- <30
μ
V
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
- Near Chip-Scale Package Footprint Improves PCB
Efficiency and Is Thinner in Profile
Pb-Free Plus Anneal Available (RoHS Compliant)
Applications
PRISM 3, PRISM GT, and PRISM WWR Chipsets
WLAN Cards
- PCMCIA, Cardbus32, MiniPCI Cards
- Compact Flash Cards
Hand-Held Instruments
Ordering Information
PART NUMBER
TEMP.
RANGE (°C)
PACKAGE
PKG.
DWG. #
ISL6414IR
-40 to +85
16 Ld QFN
L16.4x4
ISL6414IR-T5K
16 Ld QFN Tape and Reel
L16.4x4
ISL6414IR-TK
16 Ld QFN Tape and Reel
L16.4x4
ISL6414IRZ (Note)
-40 to +85
16 Ld QFN
(Pb-free)
L16.4x4
ISL6414IRZ-TK
(Note)
16 Ld QFN Tape and Reel
(Pb-free)
L16.4x4
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
material sets; molding compounds/die attach materials and 100%
matte tin plate termination finish, which are RoHS compliant and
compatible with both SnPb and Pb-free soldering operations. Intersil
Pb-free products are MSL classified at Pb-free peak reflow
temperatures that meet or exceed the Pb-free requirements of
IPC/JEDEC J STD-020.
Data Sheet
PRODUCT: ISL6412
August 2004
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2003-2005. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
NOT RECOMMENDED FOR NEW DESIGNS
POSSIBLE SUBSTITUTE