Overview
Description
The ISL9440B and ISL9440C are quad-output synchronous buck controllers that integrate three PWM controllers and one 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 ISL9440B and ISL9440C offer programmable 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. An early warning function is offered to output a logic signal to warn the system to back up data when input voltage falls below a certain level. The ISL9440B and ISL9440C 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.
Features
- Three Integrated Synchronous Buck PWM Controllers
- Internal Bootstrap Diodes
- Internal Compensation
- Independent Control for each Regulator and Programmable Output Voltages; Independent Enable/Shutdown/Soft-start
- Fixed Switching Frequency: 300kHz(B), 600kHz(C)
- Adaptive Shoot-Through Protection on all Synchronous Buck Controllers
- Pre-biased Output Start-up Capability
- 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 on Input Voltage Failure
- Integrated Reset Function
- Pb-Free (RoHS Compliant)
Comparison
Applications
Documentation
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Type | Title | Date |
Datasheet | PDF 2.17 MB | |
Other | PDF 1.17 MB | |
Product Change Notice | PDF 326 KB | |
White Paper | PDF 295 KB | |
Product Change Notice | PDF 106 KB | |
Product Change Notice | PDF 173 KB | |
Product Change Notice | PDF 248 KB | |
Application Note | PDF 509 KB | |
Application Note | PDF 397 KB | |
9 items
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Design & Development
Software & Tools
Software & Tools
Software title
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Software type
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Company
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iSim:PE Offline Simulation Tool iSim Personal Edition (iSim:PE) speeds the design cycle and reduces risk early in any project, identifying parts that can be used in current as well as next-generation designs.
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Simulator | Renesas |
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Boards & Kits
Triple, 180° Out-of-Phase, Step-Down PWM and Single Linear Controller Evaluation Board
The ISL9440BEVAL1Z evaluation board is used to evaluate the performance of the ISL9440B quad-output synchronous buck controller.
The ISL9440B is a quad-output controller that integrates three PWM synchronous buck controllers and one low-dropout linear regulator controller. The ISL9440B offers...
Models
ECAD Models
Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on the CAD Model links in the Product Options table. If a symbol or model isn't available, it can be requested directly from SamacSys.

Product Options
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