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| Triple, 180° Out-of-Phase, Step-Down PWM and Single Linear Controller |
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Available in RoHS/Pb-Free
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 Buy direct from Intersil
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 Check distributor inventory
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 Request samples
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Part No. |
Design-In
Status |
Temp. |
Package |
MSL |
Price
US $ |
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| ISL9440IRZ |
Active |
Ind |
32 Ld QFN |
2 |
4.67 |
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| ISL9440IRZ-T |
Active |
Ind |
32 Ld QFN T+R |
2 |
4.67 |
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| ISL9440EVAL1Z |
Coming
Soon |
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Eval Board |
N/A |
Contact Us |
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| The price listed is the manufacturer's suggested retail price for quantities of 1K units. However, prices in today's market are fluid and may change without notice. |
| MSL = Moisture Sensitivity Level - per IPC/JEDEC J-STD-020 |
| SMD = Standard Microcircuit Drawing |
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 Description |
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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 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 | EARLY WARNING | SWITCHING FREQUENCY (kHz) | | ISL9440 | YES | 300 | | ISL9440A | YES | 600 | | ISL9441 | NO | 300 | |
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 Key Features |
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Three Integrated Synchronous Buck PWM Controllers
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Internal Bootstrap Diodes
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Internal Compensation
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Internal Soft-Start
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Independent Control for Each Regulator and Programmable Output Voltages; Independent Enable/Shutdown
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Fixed Switching Frequency: 300kHz (ISL9440, ISL9441); 600kHz (ISL9440A)
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Adaptive Shoot Through Protection on all Synchronous Buck Controllers
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Independently Programmable Voltage Outputs
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Out-of-Phase Switching to Reduce Input Capacitance (0°/180°/0°)
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No External Current Sense Resistor
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Uses Lower MOSFET’s rDS(ON)
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Current Mode Controller with Voltage Feed Forward
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Complete Protection
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Overcurrent, Overvoltage, Undervoltage Lockout, Over-Temperature
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Cycle by Cycle Current Limiting
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Wide Input Voltage Range
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Input Rail Powers VIN Pin: 5.6V to 24V
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Input Rail Powers VCC_5V Pin (VIN tied to VCC_5V, for 5V input applications): 4.5V to 5.6V
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Early Warning (ISL9440, ISL9440A) on Input Voltage Failure
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Integrated Reset Function (ISL9440, ISL9440A)
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Pb-free (RoHS compliant)
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| Related Documentation |
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 Datasheet(s): |
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 Technical Brief(s): |
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 i-Sim: |
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 Parametric Data |
| | VIN (min) (V) | | 4.5 | | | VIN (max) (V) | | 24 | | | VOUT1 (min) (V) | | .8 | | | VOUT1 (max) (V) | | 24 | | | VOUT2 (V) | | Adj. | | | VOUT3 (V) | | Adj. | | | IOUT1 (A) | | 20 | | | IOUT2 (A) | | 20 | |
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 Application Block Diagrams |
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| Applications |
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- Satellite and Cable Set-Top Boxes
- Cable Modems
- VoX Gateway Devices
- NAS/SAN Devices
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| | HIP6019B | | Advanced Dual PWM and Dual Linear Power Control | | | | HIP6021 | | Advanced PWM and Triple Linear Power Controller | | | | HIP6521 | | PWM and Triple Linear Power Controller | | | | ISL6232 | | High Efficiency System Power Supply Controller for Notebook Computers | | | | ISL6236 | | High-Efficiency, Quad-Output, Main Power Supply Controllers for Notebook Computers | | | | ISL6236A | | High-Efficiency, Quad-Output, Main Power Supply Controllers for Notebook Computers | | | | ISL6237 | | High-Efficiency, Quad-Output, Main Power Supply Controllers for Notebook Computers | | | | ISL62381 | | High-Efficiency, Quad-Output System Power Supply Controller for Notebook Computers | | | | ISL62382 | | High-Efficiency, Quad-Output System Power Supply Controller for Notebook Computers | | | | ISL62383 | | High-Efficiency, Triple-Output System Power Supply Controller for Notebook Computers | | | | ISL6521 | | PWM Buck DC/DC and Triple Linear Power Controller | | | | ISL6523 | | VRM8.5 Dual PWM and Dual Linear Power System Controller | | | | ISL6524 | | VRM8.5 PWM and Triple Linear Power System Controller | | | | ISL6524A | | VRM8.5 PWM and Triple Linear Power System Controller | | | | ISL6537 | | ACPI Regulator/Controller for Dual Channel DDR Memory Systems | | | | ISL6548 | | ACPI Regulator/Controller for Dual Channel DDR Memory Systems | | | | ISL9440A | | Triple, 180° Out-of-Phase, Step-Down PWM and Single Linear Controller | | | | ISL9441 | | Triple, 180° Out-of-Phase, Step-Down PWM and Single Linear Controller | |
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