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ISL9444IRZ Datasheet(PDF) 1 Page - Intersil Corporation |
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ISL9444IRZ Datasheet(HTML) 1 Page - Intersil Corporation |
1 / 24 page 1 Triple, 180° Out-of-Phase, Synchronous Step-Down PWM Controller ISL9444 The ISL9444 is a triple-output synchronous buck controller that integrates three PWM controllers which are fully 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 0.7V. The PWMs are synchronized at 180° out-of-phase, thus reducing the input RMS current and ripple voltage. The ISL9444 offers independent power-good indicators, programmable soft-start and tracking functions for ease of supply rail sequencing and integrated UV/OV/OC/OT protections in a space conscious 5mmx5mm QFN package. Switching frequency can be set between 200kHz and 1200kHz using a resistor. The ISL9444 can be synchronized to another ISL9444 to reduce any beat frequency. The ISL9444 utilizes internal loop compensation to keep minimum peripheral components for a 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. Related Literature • Technical Brief TB389 “PCB Land Pattern Design and Surface Mount Guidelines for QFN (MLFP) Packages” Features • Three Integrated Synchronous Buck PWM Controllers - Internal Bootstrap Diodes - Independent Programmable Output Voltage - Independent Power-Good Indicators, Soft-Starting and Tracking •Power Failure Monitor • Light Load Efficiency Enhancement - Low Ripple Diode Emulation Mode with Pulse Skipping • Supports Pre-Biased Output • Programmable Frequency: 200kHz to 1200kHz • Adaptive Shoot-through Protection • Out-of-Phase Switching (0°/180°/0°) • No External Current Sense Resistor - Uses Lower MOSFET’s rDS(ON) • Complete Protection - Overcurrent, Overvoltage, Over-Temperature • Wide Input Voltage Range: 4.5V to 26V • Pb-Free (RoHS Compliant) Applications • VoX Gateway Devices •NAS/SAN Devices • ATX Power Supplies VIN ISL9444 VCC_5V PFI PFO EXTBIAS FB1 EN2,3 ISEN1 ISEN2 ISEN3 PHASE3 BOOT3 UGATE3 LGATE3 + CO1 L1 1.0µH + CIN1 CIN2 +12V +12V CB1 Q1 C1 4.7µF CB2 0.1µF 0.1µF RESN1 1.3kΩ Q2 L2 2.2µH RESN2 VOUT1 +1.0V, 6A 100µF 1.3kΩ VOUT2 +3.3V, 6A + CO2 100µF R1 10kΩ R2 62kΩ R3 31.6kΩ R4 15.8kΩ Q3 +12V R5 100kΩ 0.1µF CB3 RESN3 1.3kΩ L3 3.3µH VOUT3 +5.0V, 6A + CO3 100µF FB2 R6 200kΩ R7 200kΩ R8 3.09kΩ R9 11.5kΩ R3 1.74kΩ R4 10.7kΩ EN/SS1 CSS 10nF RT 49.9kΩ RT FIGURE 1. TYPICAL APPLICATION CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 |Copyright Intersil Americas Inc. 2011. All Rights Reserved Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries. All other trademarks mentioned are the property of their respective owners. May 23, 2011 FN7665.0 |
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