PDF LX1675 Data sheet ( Hoja de datos )

Número de pieza	LX1675
Descripción	Multiple Output LoadSHARE PWM
Fabricantes	Microsemi Corporation
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No Preview Available ! LX1675 TM ® Multiple Output LoadSHARE™ PWM PRODUCTION DATA SHEET DESCRIPTION The LX1675 is a highly integrated High current MOSFETs can be directly power supply controller IC featuring driven to provide an LDO output of 5A three voltage mode PWM switching and 15A for each PWM controller. This www.rDeagtuaSlahteoetr4U.snteatges with an additional is useful for I/O, memory, termination, onboard linear regulator driver. and other supplies surrounding today’s Two of the constant frequency PWM micro-processor based designs. phases can be easily configured for a The LX1675 accepts a wide range of single Bi-Phase high current output or supply voltage ranging from 4.5V to 24V. operated as two independently regulated Each PWM regulator output voltage is outputs. All outputs (PWM phases and programmed via a simple voltage-divider LDO) have separate, programmable soft- network. The LX1675 design gives start sequencing. This versatility yields engineers maximum flexibility with either three or four independently respect to the MOSFET supply. Each regulated outputs with full power phase can utilize different supply voltages sequencing capability giving system for efficient use of available supply rails. designers the ultimate flexibility in power Additionally, when two phases are supply design. configured in Bi-Phase output, the Current limit for each PWM regulator LoadSHARE™ topology can be is provided by monitoring the voltage programmed via inductor ESR selection. drop across the lower MOSFET power The split phase operation reduces power stage during conduction, utilizing the loss, noise due to the ESR of the input Rds(on) impedance. This eliminates the capacitors and allows for reduction in need for expensive current sense capacitance values while maximizing resistors. Once current limit has been regulator response time. The internal reached and persist for 4 clock cycles, the reference voltage is buffered and brought output is shut off and Soft Start is out on a separate pin to be used as an initialized to force a hiccup mode for external reference voltage. protection. IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com LoadSHARE is a Trademark of Microsemi Corporation Protected by U.S. Patents 6,285,571 and 6,292,378 VIN 4.5V to 24V PRODUCT HIGHLIGHT VOUT4 VCCL VIN VSLR LDGD LDFB SSX LX1675 AGND EOX HOX VCX HRX CSX LOX PGX FBX 5µh VOUT1, 2, 3 KEY FEATURES Four Independently Regulated Outputs Single Input Supply with Wide Voltage Range: 4.5-24V Outputs As Low As 0.8V Generated From a Precision Internal Reference Selectable PWM Frequency of 300KHz or 600KHz Buffered Reference Voltage Output Multiphase Output Reduces Need for Large Input Capacitance at High Currents Integrated High Current MOSFET Drivers Independent Soft-Start and Power Sequencing Adjustable Linear Regulator Driver Output No Current-Sense Resistors DDR Termination Compliant RoHS Compliant for Pb Free APPLICATIONS Multi-Output Power Supplies Video Card Power Supplies PC Peripherals Portable PC Processor and I/O Supply PACKAGE ORDER INFO TA (°C) Plastic MLPQ LQ 38-Pin RoHS Compliant / Pb-free 0 to 85 LX1675CLQ -40 to 85 LX1675ILQ Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1675CLQ-TR) ONE OF 3 PWM SECTIONS Copyright © 2004 Rev. 1.2a, 2006-02-16 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 1 1 page LX1675 TM ® Multiple Output LoadSHARE™ PWM PRODUCTION DATA SHEET ELECTRICAL CHARACTERISTICS (CONTINUED) For the LX1675ILQ the following specifications apply over the ambient temperature -40°C < TA < 85°C and for the LX1675CLQ 0°C < TA < 85°C except where otherwise noted and the following test conditions: VIN & VSLR = 12V, VCX = 17V, HOX and LOX =3000pF Load, FS = 0 (f = 300KHz). Parameter ` INTERNAL 5V REGULATOR Symbol Test Conditions LX1675 Units Min Typ Max Regulated Output ` UVLO AND SOFT-START (SS) VCCL Internal + External Load: 0mA < IVCCL < 50mA 4.5 5.5 V Start-Up Threshold (VCX, VCCL, VIN) Rising 3.75 4.38 V Hysteresis SS Input Resistance RSS SS Shutdown Threshold VSHDN Hiccup Mode Duty Cycle ` LINEAR REGULATOR CONTROLLER CSS = 0.1µF 0.30 V 20 KΩ 100 mV 6% Voltage Reference Tolerance LDO Supply IVSLR VLDFB = 0.8V, COUT = 330µF VSLR = 12V 3% 4 mA LDO Gate Drive VOH, Output Source Current = 0.5mA VOH, Output Source Current = 10mA 7.35 9.0 V Source Current Sink Current LDO Output Voltage Range Regulator Disable Threshold Line Regulation Load Regulation ` LOGIC INPUTS ILDGD ILDGD VOUT4 VSSL VLDGD = 7.5V VLDGD = 0.4V Note 2, 1V < VLDO – VOUT4 < 10V, IVOUT4 = 50mA Note 2 10 mA 0.25 mA 0.8 5.25 V 100 mV -1 1 % -1 1 % Threshold Logic High 2V FS,SF ` THERMAL SHUTDOWN TSD Threshold Logic Low Pulldown Resistance Hiccup Mode Operation at Limit 0.8 100 160 V KΩ °C Die Temperature Note 1: X = Phase 1, 2, 3 Note 2: System Level Measurement; Closed Loop Copyright © 2004 Rev. 1.2a, 2006-02-16 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 5 5 Page LX1675 TM ® Multiple Output LoadSHARE™ PWM PRODUCTION DATA SHEET THEORY OF OPERATION (CONTINUED) L1, Switch Side Phase 2 Error Amp 100 62k LPF1 RF2 Resistor Divider L2, Switch Resistor Side Divider Not Used 4700pF FB2 62k LPF2 62k 100 TBD 4700pF - +5V @ 7W 1.5V +46.7mV PWM Input Offset Voltage Generator V1 ESR L1 10mΩ Phase 1 - + 4.67A Vou 1.5V @ 12A 18W 1.5V +73.3mV V2 ESR L2 10mΩ Phase 2 7.33A +3.3V @ 11W Figure 8 – LoadSHARE Using Feedback Divider Offset V1 Where V1 = 1.5467 ; V2 = 1.5733 and K = then TBD = K × 100 = 5.814 K V2 1−K Copyright © 2004 Rev. 1.2a, 2006-02-16 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 11 11 Page

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