LX1671CPW

LX1671CPW Datasheet

LX1671

Part	Datasheet
LX1671CPW	LX1671CPW (pdf)

Related Parts	Information
LX1671CLQ	LX1671CLQ

PDF Datasheet Preview
LX1671 Multiple Output LoadSHARE PWM PRODUCTION DATA SHEET .COM The LX1671 is a highly integrated The additional outputs are capable of power supply controller IC featuring supplying up to 5A Linear Regulator three PWM switching regulator stages Driver and 15A Switching Regulator with an additional onboard linear for I/O, memory, termination, and other regulator driver. supplies surrounding today’s micro- Two of the constant frequency processor designs. voltage-mode PWM phases can be Each PWM regulator output is easily configured for a single Bi-Phase programmed via a simple voltage-divider high current output or two in- network. The LX1671, utilizing dependently regulated outputs. Each MOSFET RDS ON impedance, monitors phase incorporates a fully pro- current limit conditions, in each PWM grammable soft-start sequence. This phase, without the use of expensive versatility yields either three or four current sense resistors. independently regulated outputs with The LX1671 was designed to give full power sequencing capability giving design engineers maximum flexibility system designers the ultimate with respect to the MOSFET supply. flexibility in power supply design. Each phase can utilize different supply In Bi-Phase operation, the high voltages for efficient use of available current >30A output can utilize supply rails. Additionally, when two different supply rails allowing Forced phases are configured in Bi-Phase output, Current Sharing† from different the LoadSHARETM topology can be sources. Power loss and noise, due to programmed via inductor ESR selection. the ESR of the input capacitors, are There are three other methods that can minimized by operating each PWM also be used with LoadSHARETM. These output 180° out of phase. This other methods are presented in the theory architecture also minimizes capacitor of operation section of this data sheet. requirements while maximizing re- gulator response. IMPORTANT For the most current data, consult MICROSEMI’s website LoadSHARE is a Trademark of Microsemi Corporation Protected by US Patents 6,285,571 & 6,292,378 PRODUCT HIGHLIGHT Refer to Typical Application for complete circuit. DDR Termination KEY FEATURES Up to Four Independently Regulated Outputs As Low As 0.8V Generated From An Internal 1% Reference Multiphase High Current Output Reduces Required Capacitance Integrated High Current MOSFET Drivers 300kHz High Frequency Operation Minimizes External Component Requirements Independent Phase Programmable Soft-Start and Power Sequencing Adjustable Linear Regulator Driver Output No current-sense resistors DDR Termination Compliant APPLICATIONS/BENEFITS Multi-Output Power Supplies Video Card Power Supplies PC Peripherals Portable PC Processor and I/O Supply

PDF Datasheet Preview

LX1671

Multiple Output LoadSHARE PWM

PRODUCTION DATA SHEET
.COM

The LX1671 is a highly integrated The additional outputs are capable of
power supply controller IC featuring supplying up to 5A Linear Regulator
three PWM switching regulator stages Driver and 15A Switching Regulator
with an additional onboard linear for I/O, memory, termination, and other
regulator driver.
supplies surrounding today’s micro-

Two of the constant frequency processor designs.
voltage-mode PWM phases can be Each PWM regulator output is
easily configured for a single Bi-Phase programmed via a simple voltage-divider
high current output or two in- network. The LX1671, utilizing
dependently regulated outputs. Each MOSFET RDS ON impedance, monitors
phase incorporates a fully pro- current limit conditions, in each PWM
grammable soft-start sequence. This phase, without the use of expensive
versatility yields either three or four current sense resistors.
independently regulated outputs with The LX1671 was designed to give
full power sequencing capability giving design engineers maximum flexibility
system designers the ultimate with respect to the MOSFET supply.
flexibility in power supply design.

Each phase can utilize different supply

In Bi-Phase operation, the high voltages for efficient use of available
current >30A output can utilize supply rails. Additionally, when two
different supply rails allowing Forced phases are configured in Bi-Phase output, Current Sharing† from different the LoadSHARETM topology can be
sources. Power loss and noise, due to programmed via inductor ESR selection.
the ESR of the input capacitors, are There are three other methods that can minimized by operating each PWM also be used with LoadSHARETM. These
output 180° out of phase. This other methods are presented in the theory
architecture also minimizes capacitor of operation section of this data sheet.
requirements while maximizing re-
gulator response.

IMPORTANT For the most current data, consult MICROSEMI’s website LoadSHARE is a Trademark of Microsemi Corporation Protected by US Patents 6,285,571 & 6,292,378

PRODUCT HIGHLIGHT

Refer to Typical Application for complete circuit.

DDR Termination

KEY FEATURES Up to Four Independently

Regulated Outputs As Low As 0.8V

Generated From An Internal 1% Reference Multiphase High Current Output Reduces Required Capacitance Integrated High Current MOSFET Drivers 300kHz High Frequency Operation Minimizes External Component Requirements Independent Phase Programmable Soft-Start and Power Sequencing Adjustable Linear Regulator Driver Output No current-sense resistors DDR Termination Compliant

APPLICATIONS/BENEFITS Multi-Output Power Supplies Video Card Power Supplies PC Peripherals Portable PC Processor and I/O

Supply

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Datasheet ID: LX1671CPW 649007