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Fairchild Semiconductor - High Current System Voltage Buck Converter

Numéro de référence FAN5092
Description High Current System Voltage Buck Converter
Fabricant Fairchild Semiconductor 
Logo Fairchild Semiconductor 





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FAN5092 fiche technique
www.fairchildsemi.com
FAN5092
High Current System Voltage Buck Converter
Features
• Output from 1.1V to 5V
• Integrated high-current gate drivers
• Two interleaved synchronous phases per IC for maximum
performance
• Up to 4 phase power system
• Built-in current sharing between phases and between ICs
• Frequency and phase synchronization between ICs
• Remote sense and Programmable Active Droop™
• High precision voltage reference
• High speed transient response
• Programmable frequency from 200KHz to 2MHz
• Adaptive delay gate switching
• Integrated Power Good, OV, UV, Enable/Soft Start
functions
• Drives N-channel MOSFETs
• Operation optimized for 12V
• High efficiency mode at light load
• Overcurrent protection using MOSFET sensing
• 28 pin TSSOP package
Applications
• Power supply for Logic
• Modular Power supply
Description
The FAN5092 is a synchronous multi-slice DC-DC
controller IC which provides a highly accurate,
programmable output voltage for all high-current
applications. 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. FAN5092s can be paralleled while maintaining
both frequency and phase synchronization and ensuring
current sharing in a high-power system. The FAN5092
features remote voltage sensing, Programmable Active
Droopand advanced response for optimal converter
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.
These make it possible to create power supplies running at a
switching frequency as high as 4MHz, for ultra-high density.
The output voltage can be set from 1.1V to 5V with an
accuracy of 0.5%. The FAN5092 uses a high level of
integration to deliver load currents in excess of 150A from a
12V source with minimal external circuitry. The FAN5092
also offers integrated functions including Power Good,
Output Enable/Soft Start, under-voltage lockout, over-
voltage protection, and current limiting with independent
current sense on each slice. It is available in a 28-pin TSSOP
package.
Block Diagram
+12V
VFB
FAN5092
+
PHASE
CLK ISHR
CLK ISHR
PHASE
+12V
+12V
FAN5092
+12V
VFB
+ 3.3V @ 120A
VFB
Programmable Active Droop is a trademark of Fairchild Semiconductor.
REV. 1.0.7 6/20/02

PagesPages 20
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