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FAN5019BMTCX Datasheet(PDF) 1 Page - Fairchild Semiconductor |
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FAN5019BMTCX Datasheet(HTML) 1 Page - Fairchild Semiconductor |
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1 / 30 page  www.fairchildsemi.com REV. 1.0.0 Jul/15/05 Features • Improved Noise Immunity • Improved Load Line Accuracy • TTL Compatible VID Inputs • Fully Pin and Function compatible with existing FAN5019 and ADP3188 Controllers • Precision Multi-Phase DC-DC Core Voltage Regulation – ±10mV Output Voltage Accuracy Over Temperature • Differential Remote Voltage Sensing • Selectable 2-, 3-, or 4-Phase Operation • Selectable VRM9 or VRM10 Operation • Up to 1MHz per Phase Operation (4MHz ripple Frequency) • Lossless Inductor Current Sensing for Loadline Compensation – External Temperature Compensation • Accurate Loadline Programming (Meets Intel® VRM/VRD10.x CPU Specifications) • Accurate Channel-Current Balancing for Thermal Optimization and Layout Compensation • Convenient 12V Supply Biasing • 6-bit Voltage Identification (VID) Input – .8375V to 1.600V in 12.5mV Steps – Dynamic VID Capability with Fault-Blanking for glitch-less Output voltage Changes • Adjustable Over Current Protection with Programmable Latch-Off Delay. Latch-Off Function may be Disabled • Over-Voltage Protection – Internal OVP Crowbar Protection • Package: 28L-TSSOP Applications • VRM/VRD 9.x and 10.x Computer DC/DC Converter • High-Current, Low-Voltage DC/DC Rail General Description The FAN5019B is a multi-phase DC-DC controller for implementing high-current, low-voltage, CPU core power regulation circuits. It is part of a chipset that includes exter- nal MOSFET drivers and power MOSFETS. The FAN5019B drives up to four synchronous-rectified buck channels in parallel. The multi-phase buck converter archi- tecture uses interleaved switching to multiply ripple fre- quency by the number of phases and reduce input and output ripple currents. Lower ripple results in fewer components, lower component cost, reduced power dissipation, and smaller board area. The FAN5019B features a high-bandwidth control loop to provide optimal response to load transients. The FAN5019B senses current using lossless techniques: Phase current is measured through each of the output inductors. This current information is summed, averaged and used to set the loadline of the output via programmable "droop." The droop is tem- perature compensated to achieve precise loadline character- istics over the entire operating range. Additionally, individual phase current is measured using the RDS(ON) of the low-side MOSFETs. This information is used to dynam- ically balance/steer per-phase current. The phase currents are also summed and averaged for over-current detection. Dynamic-VID technology allows on-the-fly VID changes with controlled, glitch-less output. Additionally, short-circuit protection, adjustable current limiting, over-voltage protec- tion and power-good circuitry combine to ensure reliable and safe operation. FAN5019B is specified over the commercial temperature range of 0°C to +85°C and operates from a sin- gle +12V supply which simplifies design. FAN5019B is available in a 28L-TSSOP package. Block Diagram FAN5019B V IN V IN Φ1 Φ4 V OUT Φ3 Φ2 FAN5009 FAN5009 FAN5019B 6-Bit VID Controller 2-4 Phase VR10.X Controller |
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