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Intersil Electronic Components Datasheet

ISL9441 Datasheet

(ISL9440 / ISL9441) Step-Down PWM and Single Linear Controller

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ISL9441 pdf
®
Data Sheet
ISL9440, ISL9440A, ISL9441
December 5, 2007
FN6383.1
Triple, 180° Out-of-Phase, Step-Down
PWM and Single Linear Controller
www.TdahteasIhSeLe9t44u4.0c,oImSL9440A and ISL9441 are quad-output
synchronous buck controllers that integrate 3 PWM
controllers and 1 low drop-out linear regulator controller, which
are full featured and designed to provide multi-rail power for
use in products such as cable and satellite set-top boxes,
VoIP gateways, cable modems, and other home connectivity
products as well as a variety of industrial and general purpose
applications. Each output is adjustable down to 0.8V. The
PWMs are synchronized at 180° out of phase thus reducing
the RMS input current and ripple voltage.
The ISL9440, ISL9440A and ISL9441 offer internal soft-start,
independent enable inputs for ease of supply rail
sequencing, and integrated UV/OV/OC/OT protections in a
space conscious 5mmx5mm QFN package. The ISL9440
and ISL9440A offer an early warning function to output a
logic signal to warn the system to back up data when input
voltage falls below a certain level.
The ISL9440, ISL9440A and ISL9441 utilize internal loop
compensation to keep minimum peripheral components for
compact design and a low total solution cost. These devices
are implemented with current mode control with feed forward
to cover various applications even with fixed internal
compensations.
The table below shows the difference in terms of ISL9440,
ISL9440A and ISL9441 features.
PART
NUMBER
ISL9440
ISL9440A
ISL9441
EARLY
WARNING
YES
YES
NO
SWITCHING FREQUENCY
(kHz)
300
600
300
Features
• Three Integrated Synchronous Buck PWM Controllers
- Internal Bootstrap Diodes
- Internal Compensation
- Internal Soft-Start
• Independent Control for Each Regulator and
Programmable Output Voltages; Independent
Enable/Shutdown
• Fixed Switching Frequency: 300kHz (ISL9440, ISL9441);
600kHz (ISL9440A)
• Adaptive Shoot Through Protection on all Synchronous
Buck Controllers
• Independently Programmable Voltage Outputs
• Out-of-Phase Switching to Reduce Input Capacitance
(0°/180°/0°)
• No External Current Sense Resistor
- Uses Lower MOSFET’s rDS(ON)
• Current Mode Controller with Voltage Feed Forward
• Complete Protection
- Overcurrent, Overvoltage, Undervoltage Lockout,
Over-Temperature
• Cycle by Cycle Current Limiting
• Wide Input Voltage Range
- Input Rail Powers VIN Pin: 5.6V to 24V
- Input Rail Powers VCC_5V Pin (VIN tied to VCC_5V, for
5V input applications): 4.5V to 5.6V
• Early Warning (ISL9440, ISL9440A) on Input Voltage
Failure
• Integrated Reset Function (ISL9440, ISL9440A)
• Pb-free (RoHS compliant)
Applications
• Satellite and Cable Set-Top Boxes
• Cable Modems
• VoX Gateway Devices
• NAS/SAN Devices
Related Literature
• Technical Brief TB389 “PCB Land Pattern Design and
Surface Mount Guidelines for QFN (MLFP) Packages”
1 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. 2007. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.


Intersil Electronic Components Datasheet

ISL9441 Datasheet

(ISL9440 / ISL9441) Step-Down PWM and Single Linear Controller

No Preview Available !

ISL9441 pdf
ISL9440, ISL9440A, ISL9441
Ordering Information
PART
NUMBER
(Note)
PART
MARKING
TEMP.
RANGE
(°C)
PACKAGE
(Pb-Free)
PKG.
DWG. #
ISL9440IRZ* ISL9440IRZ -40 to +85 32 Ld 5x5 QFN L32.5x5B
ISL9440AIRZ* 9440AIRZ -40 to +85 32 Ld 5x5 QFN L32.5x5B
www.datasheet4u.com
ISL9441IRZ* ISL9441IRZ -40 to +85 32 Ld 5x5 QFN L32.5x5B
*Add “-T” for tape and reel. Please refer to TB347 for details on reel
specifications.
NOTE: These Intersil Pb-free plastic packaged products employ
special Pb-free material sets; molding compounds/die attach materials
and 100% matte tin plate PLUS ANNEAL - e3 termination finish, which
is 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.
Pinout
ISL9440, ISL9440A, ISL9441
(32 LD 5X5 QFN)
TOP VIEW
32 31 30 29 28 27 26 25
ISEN1 1
24 ISEN2
PGOOD 2
23 PGND
VCC_5V 3
22 LGATE3
VIN 4
21 UGATE3
EN1 5
20 BOOT3
FB1 6
19 PHASE3
OCSET1 7
18 ISEN3
RST 8
17 EN3
9 10 11 12 13 14 15 16
2 FN6383.1
December 5, 2007


Part Number ISL9441
Description (ISL9440 / ISL9441) Step-Down PWM and Single Linear Controller
Maker Intersil Corporation
Total Page 20 Pages
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