NOT RECOMMENDED FOR NEW DESIGNS DATASHEET USE ISL6443A ISL6443 FN9044 Rev 2.00 300kHz Dual, 180 Out-of-Phase, Step-Down PWM and Single Linear Controller Aug 9, 2006 The ISL6443 is a high-performance, triple-output controller Features optimized for converting wall adapter, battery or network Wide Input Supply Voltage Range intermediate bus DC input supplies into the system supply - Variable 5.6V to 24V voltages required for a wide variety of applications. Each - Fixed 4.5V to 5.6V output is adjustable down to 0.8V. The two PWMs are synchronized 180 out of phase reducing the RMS input Three Independently Programmable Output Voltages current and ripple voltage. Switching Frequency . 300kHz The ISL6443 incorporates several protection features. An Out of Phase PWM Controller Operation adjustable overcurrent protection circuit monitors the output - Reduces Required Input Capacitance and Power current by sensing the voltage drop across the lower Supply Induced Loads MOSFET. Hiccup mode overcurrent operation protects the DC/DC components from damage during output No External Current Sense Resistor overload/short circuit conditions. Each PWM has an - Uses Lower MOSFETs r DS(ON) independent logic-level shutdown input (SD1 and SD2). Bidirectional Frequency Synchronization for Synchronizing Multiple ISL6443s A single PGOOD signal is issued when soft-start is complete on both PWM controllers and their outputs are within 10% of Programmable Soft-Start the set point and the linear regulator output is greater than Extensive circuit protection functions 75% of its setpoint. Thermal shutdown circuitry turns off the - PGOOD device if the junction temperature exceeds +150C. -UVLO Ordering Information - Overcurrent - Over-temperature PART PART TEMP. PKG. NUMBER MARKING RANGE (C) PACKAGE DWG. - Independent Shutdown for Both PWMs ISL6443IR ISL6443IR -40 to 85 28 Ld 5x5 QFN L28.5x5 Excellent Dynamic Response ISL6443IRZ ISL6443IRZ -40 to 85 28 Ld 5x5 QFN L28.5x5 - Voltage Feed-Forward with Current Mode Control (See Note) (Pb-free) QFN Packages: Add -T or -TK suffix for tape and reel. - QFN - Compliant to JEDEC PUB95 MO-220 NOTE: Intersil Pb-free plus anneal products employ special Pb-free QFN - Quad Flat No Leads - Package Outline material sets molding compounds/die attach materials and 100% - Near Chip Scale Package footprint, which improves matte tin plate termination finish, which are RoHS compliant and PCB efficiency and has a thinner profile compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow Pb-Free Plus Anneal Available (RoHS Compliant) temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. Applications Power Supplies with Multiple Outputs xDSL Modems/Routers DSP, ASIC, and FPGA Power Supplies Set-Top Boxes Dual Output Supplies for DSP, Memory, Logic, P Core and I/O Telecom Systems FN9044 Rev 2.00 Page 1 of 18 Aug 9, 2006ISL6443 Pinouts ISL6443 (QFN) TOP VIEW 28 27 26 25 24 23 22 PHASE2 ISEN1 1 21 ISEN2 2 20 PGND PGOOD 3 19 SD1 VCC 5V 4 18 SS1 5 17 SGND SD2 SS2 6 16 OCSET1 OCSET2 7 15 FB1 8 9 10 11 12 13 14 FN9044 Rev 2.00 Page 2 of 18 Aug 9, 2006 FB2 UGATE2 SGND BOOT2 VIN LGATE2 SYNC LGATE1 FB3 BOOT1 GATE3 UGATE1 SGND PHASE1