LX1673 Datasheet | Microsemi

TM ® High Frequency PWM Regulator P RODUCTION D ATA S HEET DESCRIPTION KEY Features . Microsemi . C OM The LX1673 is a highly integrated power supply controller IC featuring one ..net PWM switching regulator stage with an additional onboard linear regulator driver. With several switching frequencies available (up to 900k Hz) the LX1673 can be optimized for both cost and PCB space. Utilizing external pensation, a wide selection of external ponents can be chosen for use in any application while maintaining stable operation. The LX1673 incorporates a fully programmable soft-start and power sequence capabilities. The LDO and PWM have independent enable pins. With onboard gate drivers, the switching PWM output is capable of sourcing up to 15A. The LX1673 also Features an additional Linear Regulator Controller output, which when coupled with an inexpensive MOSFET is capable of supplying up to an additional 5A for I/O, memory, and other supplies surrounding today’s microprocessor designs. Each regulator output voltage is programmed via a simple voltage-divider network. Integrated hiccup mode current limiting is implemented utilizing MOSFET RDS(ON) impedance. This enables the LX1673 to monitor maximum current limit conditions without the use of expensive current sense resistors. - Two Independently Regulated Outputs - Outputs As Low As 0.8V Generated From An Internal 1% Reference - Integrated High Current MOSFET Drivers - 300KHz, 600KHz, and 900KHz High Frequency Operation Minimizes External ponent Requirements - Soft-Start and Power Sequencing Control - Adjustable Linear Regulator Driver Output - No current-sense resistors APPLICATIONS/BENEFITS - - - - - Video Card Power Supplies PC Peripherals puter Add-On Cards 3.3V Power Conversion DDR Memory Termination IMPORTANT: For the most current data, consult MICROSEMI’s website: http://.microsemi. PRODUCT HIGHLIGHT +3.3V +5V PWRGD VOUT1 +12V +3.3V 20 1 LDGD 2 LDFB VOUT2 3...