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FAN5093
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 1MHz 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 • High efficiency mode (E*) at light load • Overcurrent protection using MOSFET sensing • 24 pin TSSOP package
Description
The FAN5093 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 FAN5093 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 FAN5093 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 FAN5093 uses a high level of integration to deliver load currents in excess of 50A from a 12V source with minimal external circuitry. The FAN5093 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 23 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. 1.1.0 3/27/03
FAN5093
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/E* ILIM PWRGD VCC LDRVA PGNDA SWA HDRVA BOOTA
FAN5093
Pin Definitions
Pin Number 1-5 Pin Name VID0-4 Pin Function Description Voltage Identification Code Inputs. Open collector/TTL compatible inputs will program the output voltage over the ranges specified in Table 1. Internally PulledUp. 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
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