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ISL6446IAZ-TK Datasheet(PDF) 1 Page - Intersil Corporation |
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ISL6446IAZ-TK Datasheet(HTML) 1 Page - Intersil Corporation |
1 / 19 page 1 Dual (180° Out-of-Phase) PWM and Linear Controller ISL6446 The ISL6446 is a high-performance, triple output controller that provides a single high-frequency power solution primarily for Broadband, DSL and Networking applications. This device integrates complete control, monitoring and protection functions for two synchronous buck PWM controllers and one linear controller. Input voltage ripple and total RMS input current is substantially reduced by synchronized 180° out-of-phase operation of the two PWMs. The two PWM buck converters provide simple voltage mode control. The output voltage of the converters can be precisely regulated to as low as 0.6V, with a maximum tolerance of ±1.5% over-temperature and line variations. Programmable switching frequency down to 100kHz provides optimized low cost solution for ATX power supplies. It’s also able to operate up to 2.5MHz to deliver compact solutions. The linear controller provides a low-current output. Each PWM controller has soft-start and independent enable functions combined on a single pin. A capacitor from SS/EN to ground sets the soft-start time; pulling SS/EN pin below 1V disables the controller. Both outputs can soft-start into a pre-biased load. The ISL6446 incorporates robust protection features. An adjustable overcurrent protection circuit monitors the output current by sensing the voltage drop across the upper MOSFET rDS(ON). Latch-off mode overcurrent operation protects the DC/DC converters from damage under overload and short circuit conditions. A PGOOD signal is issued when soft-start is complete and PWM outputs are within 10% of their regulated values and the linear regulator output is higher than 75% of its nominal value. Thermal shut-down circuitry turns the device off if the IC temperature exceeds +150°C. Features • 4.5V to 5.5V or 5.5V to 24V input voltage range • Three programmable power output voltages - Two PWM controllers with out-of-phase operation - Voltage-mode PWM control - One linear controller • Programmable switching frequency from 100kHz to 2.5MHz • Fast transient response - High-bandwidth error amplifier •Extensive circuit protection functions - Undervoltage, and over-temperature - Overvoltage with latch-off mode - Programmable overcurrent limit with latch-off mode - Lossless current sensing (no sense resistor needed) • Externally adjustable soft-start time - Independent enable control - Voltage tracking capability - Able to soft-start into a pre-biased load • PGOOD output with delay Applications • ATX power supplies • DSP, ASIC, and FPGA point of load regulation • Industrial and security networking applications FIGURE 1. TYPICAL APPLICATION FIGURE 2. EFFICIENCY vs LOAD CURRENT (OBTAINED FROM ISL6446EVAL1Z) BOOT1 UGATE1 LCDR LCFB COMP1 FB1 SGND LGATE1 PGND VIN1 = VIN BOOT2 UGATE2 LGATE2 VIN VCC VIN SS1/EN1 SS2/EN2 PGOOD RT VOUT1 VOUT1 VCC VOUT2 FB2 COMP2 ISL6446 OCSET1 PHASE1 OCSET2 PHASE2 Feedback R2 R1 ROCSET1 CVCC COCSET1 CBOOT1 L1 CIN1 COUT1 Q1 Q2 VIN2 = VIN VOUT2 COCSET2 CBOOT2 L2 CIN2 COUT2 Q3 Q4 ROCSET2 and Compensation Network Feedback and Compensation Network 80 82 84 86 88 90 92 94 96 98 100 0 5 10 15 20 25 LOAD CURRENT (A) VOUT = 5V VOUT = 3.3V CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2012, 2013. 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. October 15, 2013 FN7944.1 |
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