1
FN9067.1
ISL6412
Triple Output, Low-Noise LDO Regulator
with Integrated Reset Circuit
The ISL6412 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), 2.8V (LDO2), and another ultra-clean
2.8V (LDO3). On chip logic provides sequencing between
LDO1 and LDO2 for the BBP/MAC and the 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 the ISL6412 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 ISL6412 uses an internal PMOS transistor as the pass
device. The ISL6412 also integrates a reset function, which
eliminates the need for the 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 a time set by a capacitor to
GND after VIN has risen above the reset threshold. FAULT1
indicates the loss of regulation on LDO1.
Features
• Small DC/DC Converter Size
- Three LDOs and Reset Circuitry in a Low-Profile
4x4mm QFN Package
• High Output Current
- LDO1, 1.8V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 330mA
- LDO2, 2.8V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225mA
- LDO3, 2.8V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125mA
• Ultra-Low Dropout Voltage
- LDO2, 2.8V. . . . . . . . . . . . . . . . 125mV (typ.) at 225mA
- LDO3, 2.8V. . . . . . . . . . . . . . . . 100mV (typ.) at 125mA
• Ultra-Low Output Voltage Noise
-<30V
RMS
(typ.) for LDO3 (VCO Supply)
• Stable with Small Ceramic Output Capacitors
• Extensive Protection and Monitoring Features
- Over current protection
- Short circuit protection
- Thermal shutdown
- FAULT indicator
• Logic-Controlled Shutdown Pin
• Integrated Microprocessor Reset Circuit
- Programmable Reset Delay
• Proven Reference Design for a Total WLAN System
Solution
• QFN Package
- 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 Chipsets – ISL37106P
•WLAN Cards
- PCMCIA, Cardbus32, MiniPCI Cards
- Compact Flash Cards
• Liberty Chipset
• Hand-Held Instruments
Ordering Information
PART
NUMBER
PART
MARKING
TEMP.
RANGE
(°C) PACKAGE
PKG.
DWG. #
ISL6412IR ISL6412IR -40 to +85 16 Ld 4x4 QFN L16.4x4
ISL6412IR-TK ISL6412IR -40 to +85 16 Ld 4x4 QFN L16.4x4
ISL6412IR-T5K ISL6412IR -40 to +85 16 Ld 4x4 QFN L16.4x4
ISL6412IRZ
(Note 2)
6412IRZ -40 to +85 16 Ld 4x4 QFN
(Pb-free)
L16.4x4
ISL6412IRZ-TK
(Notes 1, 2)
6412IRZ -40 to +85 16 Ld 4x4 QFN
(Pb-free)
L16.4x4
NOTES:
1. Tape and Reel available. Add “-T” suffix for Tape and Reel Packing
Option
2. 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 March 20, 2007
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. 2004, 2007. All Rights Reserved. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
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