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ISL6268CAZ Datasheet(PDF) 1 Page - Intersil Corporation |
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ISL6268CAZ Datasheet(HTML) 1 Page - Intersil Corporation |
1 / 14 page 1 ® FN6348.0 ISL6268 High-Performance Notebook PWM Controller The ISL6268 IC is a Single-Phase Synchronous-Buck PWM controller featuring Intersil's Robust Ripple Regulator (R3) technology that delivers truly superior dynamic response to input voltage and output load transients. Integrated MOSFET drivers and bootstrap diode result in fewer components and smaller implementation area. Intersil’s R3 technology combines the best features of fixed-frequency PWM and hysteretic PWM while eliminating many of their shortcomings. R3 technology employs an innovative modulator that synthesizes an AC ripple voltage signal VR, analogous to the output inductor ripple current. The AC signal VR enters a window comparator where the lower threshold is the error amplifier output VCOMP, and the upper threshold is a programmable voltage reference VW, resulting in generation of the PWM signal. The voltage reference VW sets the steady-state PWM frequency. Both edges of the PWM can be modulated in response to input voltage transients and output load transients, much faster than conventional fixed-frequency PWM controllers. Unlike a conventional hysteretic converter, the ISL6268 has an error amplifier that provides ±1% voltage regulation at the FB pin. The ISL6268 has a 1.5ms digital soft-start and can be started into a pre-biased output voltage. A resistor divider is used to program the output voltage setpoint. The ISL6268 normally operates in continuous-conduction-mode (CCM), automatically entering diode-emulation-mode (DEM) at low load for optimum efficiency. In CCM the converter operates as a synchronous rectifier. In DEM the low-side MOSFET stays off, blocking negative current flow from the output inductor. Pinout ISL6268 (16 LD SSOP) TOP VIEW Features • High performance R3 technology • Fast transient response • ±1% regulation accuracy: -10°C to +100°C • Wide input voltage range: +7.0V to +25.0V • Output voltage range: +0.6V to +3.3V • Wide output load range: 0A to 25A • Diode emulation mode for increased light load efficiency • Programmable PWM frequency: 200kHz to 600kHz • Pre-biased output start-up capability • Integrated MOSFET drivers and bootstrap diode • Internal digital soft-start • Power good monitor • Fault protection - Undervoltage protection - Soft crowbar overvoltage protection - Low-side MOSFET r DS(on) overcurrent protection - Over-temperature protection - Fault identification by PGOOD pull-down resistance • Pb-free plus anneal available (RoHS compliant) Applications • PCI express graphical processing unit • Auxiliary power rail •VRM • Network adapter 14 15 16 9 13 12 11 10 1 2 3 4 5 7 6 8 PHASE PGOOD VIN VCC EN COMP GND FB UG PVCC LG PGND ISEN VO FSET BOOT Ordering Information PART NUMBER PART MARKING TEMP (°C) PACKAGE PKG. DWG. # ISL6268CAZ (Note) 6268CAZ -10 to +100 16 Ld QSOP (Pb-free) M16.15A ISL6268CAZ-T (Note) 6268CAZ 16 Ld QSOP Tape and Reel (Pb-free) M16.15A NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. Data Sheet August 22, 2006 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2006. All Rights Reserved All other trademarks mentioned are the property of their respective owners. |
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