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5090MTC Dataheets PDF



Part Number 5090MTC
Manufacturers Fairchild Semiconductor
Logo Fairchild Semiconductor
Description FAN5090MTC
Datasheet 5090MTC Datasheet5090MTC Datasheet (PDF)

www.fairchildsemi.com FAN5090 Two Phase Interleaved Synchronous Buck Converter for VRM 9.x Applications Features • Programmable output from 1.10V to 1.85V in 25mV steps using an integrated 5-bit DAC • Two interleaved synchronous phases for maximum performance • 100nsec transient response time • Built-in current sharing between phases • Remote sense • Programmable Active Droop (Voltage Positioning) • Programmable switching frequency from 100KHz to 300KHz per phase • Adaptive delay gate switchin.

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www.fairchildsemi.com FAN5090 Two Phase Interleaved Synchronous Buck Converter for VRM 9.x Applications Features • Programmable output from 1.10V to 1.85V in 25mV steps using an integrated 5-bit DAC • Two interleaved synchronous phases for maximum performance • 100nsec transient response time • Built-in current sharing between phases • Remote sense • Programmable Active Droop (Voltage Positioning) • Programmable switching frequency from 100KHz to 300KHz per phase • Adaptive delay gate switching • Integrated high-current gate drivers • Integrated Power Good, OV, UV, Enable/Soft Start functions • Drives N-channel MOSFETs • Operation optimized for 12V operation • Overcurrent protection using MOSFET sensing • 24 pin TSSOP package Description The FAN5090 is a synchronous two-phase DC-DC controller IC which provides a highly accurate, programmable output voltage for VRM 9.x processors. Two interleaved synchronous buck regulator phases with built-in current sharing operate 180° out of phase to provide the fast transient response needed to satisfy high current applications while minimizing external components. The FAN5090 features Programmable Active Droop for transient response with minimum output capacitance. It has integrated high-current gate drivers, with adaptive delay gate switching, eliminating the need for external drive devices. The FAN5090 uses a 5-bit D/A converter to program the output voltage from 1.10V to 1.85V in 25mV steps with an accuracy of 1%. The FAN5090 uses a high level of integration to deliver load currents in excess of 50A from a 12V source with minimal external circuitry. The FAN5090 also offers integrated functions including Power Good, Output Enable/Soft Start, under-voltage lockout, over-voltage protection, and adjustable current limiting with independent current sense on each phase. It is available in a 24 pin TSSOP package. Applications • • • • Power supply for Pentium IV Power supply for Athlon VRM for Pentium IV processor Programmable step-down power supply Block Diagram BYPASS 6 23 RT +12V 18 5V Reg UVL O BOOT A 13 +12V OSC 14 + - Digital Control 15 +12V 17 16 BOOT B VO +12V + GNDA Current Limit + + + 12 11 Digital Control 10 +12V 8 9 5-Bit DAC 1 2 3 4 5 VID0 VID2 VID4 VID1 VID3 24 Power Good 19 PWRGD 21 7 22 ENABLE/SS 20 ILIM DROOP/E* AGND Pentium is a registered trademark of Intel Corporation. Athlon is a registered trademark of AMD. Programmable Active Droop is a trademark of Fairchild Semiconductor. REV. 1.0.1 9/16/03 www.DataSheet.in FAN5090 PRODUCT SPECIFICATION Pin Assignments VID0 VID1 VID2 VID3 VID4 BYPASS AGND LDRVB PGNDB SWB HDRVB BOOTB 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 VFB RT ENABLE/SS DROOP ILIM PWRGD VCC LDRVA PGNDA SWA HDRVA BOOTA FAN5090 Pin Definitions Pin Number 1-5 6 7 8 Pin Name VID0-4 BYPASS AGND LDRVB Pin Function Description Voltage Identification Code Inputs. Internally pulled-up open collector/TTL compatible inputs program the output voltage over range specified in Table 1. 5V Rail. Bypass this pin with a 0.1µF ceramic capacitor to AGND. Analog Ground. Return path for low power analog circuitry. This pin should be connected to a low impedance system ground plane to minimize ground loops. Low Side FET Driver for B. Connect this pin to the gate of an N-channel MOSFET for synchronous operation. The trace from this pin to the MOSFET gate should optimally be <0.5". Power Ground B. Return pin for high currents flowing in low-side MOSFET. Connect directly to low-side MOSFET source. High Side Driver Source and Low Side Driver Drain Switching Node B. Gate drive return for high side MOSFET, and negative input for low-side MOSFET current sense. High Side FET Driver B. Connect this pin to the gate of an N-channel MOSFET. The trace from this pin to the MOSFET gate should optimally be <0.5". Bootstrap B. Input supply for high-side MOSFET. Bootstrap A. Input supply for high-side MOSFET. High Side FET Driver A. Connect this pin to the gate of an N-channel MOSFET. The trace from this pin to the MOSFET gate should optimally be <0.5". High Side Driver Source and Low Side Driver Drain Switching Node A. Gate drive return for high side MOSFET, and negative input for low-side MOSFET current sense. Power Ground A. Return pin for high currents flowing in low-side MOSFET. Connect directly to low-side MOSFET source. Low Side FET Driver for A. Connect this pin to the gate of an N-channel MOSFET for synchronous operation. The trace from this pin to the MOSFET gate should optimally be <0.5". VCC. Internal IC supply. Connect to system 12V supply, and decouple with a 10Ω resistor and 1µF ceramic capacitor. Power Good Flag. An open collector output that will be logic LOW if the output voltage is less than 350mV less than the nominal output voltage setpoint. Power Good is prevented from going low until the output voltage is out of spec for 500µsec. 9 10 PGNDB SWB 11 12 13 14 15 HDRVB BOOTB BOOTA HDRVA SWA 16 17 PGNDA LDRVA 18.


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