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ISL9440| Datasheet

By datasheet - October 30th, 2008

ISL9440, ISL9440A, ISL9441

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ISL9440, ISL9440A, ISL9441
Data Sheet December 5, 2007 FN6383.1

Triple, 180 Out-of-Phase, Step-Down PWM and Single Linear Controller
The ISL9440, ISL9440A 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 per
ipheral 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"

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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.


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