LX1675CLQ MICROSEMI, LX1675CLQ Datasheet
LX1675CLQ
Specifications of LX1675CLQ
Related parts for LX1675CLQ
LX1675CLQ Summary of contents
Page 1
... RoHS Compliant for Pb Free Multi-Output Power Supplies Video Card Power Supplies PC Peripherals Portable PC Processor and I/O Supply Plastic MLPQ LQ T (°C) 38-Pin A RoHS Compliant / Pb-free LX1675CLQ - LX1675ILQ Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1675CLQ-TR) Page 1 ...
Page 2
... Copyright © 2004 Rev. 1.2a, 2006-02-16 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Multiple Output LoadSHARE™ PWM ® ................................................ 1A (200ns ................................................. 1.5A (200ns) X CCL . , θ 55°C/W MBIENT JA x θ Microsemi Integrated Products Division LX1675 RODUCTION ATA HEET LO2 1 31 HR2 2 30 HO2 ...
Page 3
... High Side driver return, connect this pin to High Side MOSFET source. “X” denotes corresponding phase. Copyright © 2004 Rev. 1.2a, 2006-02-16 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Multiple Output LoadSHARE™ PWM ® Description Microsemi Integrated Products Division LX1675 D S RODUCTION ATA HEET Page 3 ...
Page 4
... TM For the LX1675ILQ the following specifications apply over the ambient temperature -40°C < TA < 85°C and for the LX1675CLQ 0°C ≤ T 85°C except where otherwise noted and the following test conditions Load 300KHz). Parameter SWITCHING REGULATORS Input Voltage Operation Current ...
Page 5
... For the LX1675ILQ the following specifications apply over the ambient temperature -40°C < TA < 85°C and for the LX1675CLQ 0°C < T < 85°C except where otherwise noted and the following test conditions Load 300KHz). Parameter INTERNAL 5V REGULATOR Regulated Output UVLO AND SOFT-START (SS) ...
Page 6
... R TSD AGND SF Figure 1 – Typical Block Diagram for Phases 1, and 3 VSLR 9.6V Regualtor SSL + LDOEA - 20K V REF F 500k LDOFLT SF Figure 2 – LDO Controller Block Diagram Microsemi Integrated Products Division LX1675 RODUCTION ATA HEET +5V VIN VCx C IN HOx LX HRx ESR LOx C OUT ...
Page 7
... Multiple Output LoadSHARE™ PWM ® SET PWM CYCLE COUNTER Hiccup Vref BG SS COMP Regulator - + RAMP CLK F S FAULT UVLO R SSMSK TSD AGND Microsemi Integrated Products Division LX1675 RODUCTION ATA HEET +5V VIN VC2 C IN HO2 L2 HR2 ESR LO2 C OUT PGx VIN + VIN +5V +5V + ...
Page 8
... HR2 LO3 3 29 HO2 PG3 C9 4.7uF 4 28 VC2 VCCL 5 27 CS2 VIN C10 4.7uF R14 25V CS1 U2 2.00K 7 25 LX1675CLQ EO2 DGND R4 2.00K 8 24 FB2 CS3 C15 22pF TP26 9 23 SS2 RF2 EO3 R5 100K C16 1.2nF 11 21 EO1 FB3 12 20 FB1 ...
Page 9
... This will force the current in the phase 2 inductor to follow and be equal to the current in the phase 1 inductor. There are four methods that can be used to implement the LoadSHARE feature of the LX1675 in the Bi-Phase mode of operation. Microsemi Integrated Products Division LX1675 ...
Page 10
... V2. The high DC gain of the error amplifier will force LPF2 to always be equal to LPF1. The following calculations determine the value of the resistor divider necessary to satisfy this example. 4.67A 1.5V @ 12A 18W 7.33A Microsemi Integrated Products Division LX1675 RODUCTION ATA HEET ...
Page 11
... PWM 4700pF Input - FB2 Generator Figure 8 – LoadSHARE Using Feedback Divider Offset V 1 × K 100 then TBD 5.814 − Microsemi Integrated Products Division LX1675 RODUCTION ATA HEET + ESR L1 V1 1.5V 10mΩ 4.67A +46.7mV Phase 1 - Offset Voltage + 1.5V @ 12A ESR L2 V2 10mΩ ...
Page 12
... Two external amplifiers are required or this method. Offset Amp Vos Rin - Rf Phase 2 Error Amp PWM Input - Generator FB2 62k Rb 1M Figure 9 – LoadSHARE Using Proportional Control Microsemi Integrated Products Division LX1675 RODUCTION ATA HEET + ESR L1 1.5V V 10mΩ 1 4.67A +46.7mV Phase 1 ...
Page 13
... Nominal ESR of 6mΩ. ESR ±5% Max offset Error = 6mV ⎞ +5% ESR L1 = 6.3 mΩ ⎟ ⎠ -5% ESR L2 = 5.7 mΩ Phase Phase 2 current is 2.32A greater than Phase 1. Input bias current also contributes to imbalance. Microsemi Integrated Products Division LX1675 RODUCTION ATA HEET SHARE ( ...
Page 14
... There is frequently strong pressure to use the least expensive components possible; however, this could lead to degraded long- term reliability, especially in the case of filter capacitors. Microsemi’s demonstration boards use the CDE Polymer AL-EL (ESRE) filter capacitors, which are aluminum electrolytic, and ) have demonstrated reliability. The OS-CON series from Sanyo ...
Page 15
... PWM cycles. If the current limit condition goes away t after a count of 2 the counter will be reset. This mode will prevent a single cycle current or noise glitch from starting the hiccup mode current limit. Microsemi Integrated Products Division LX1675 RODUCTION ATA HEET equal to 0.1µ ...
Page 16
... Keep R and magnitude For more information see Microsemi Application Note 1307: LX1671 Product design Guide . The LX1675 and LX1671 have the same functionality and this information will be applicable. Copyright © 2004 Rev. 1.2a, 2006-02-16 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Multiple Output LoadSHARE™ ...
Page 17
... This will allow a smooth ramp up of the LDO voltage rail. The voltage rail for the LDO pass transistor can come from any of the other PWM phases if desirable. If the VIN power supply Microsemi Integrated Products Division LX1675 P D ...
Page 18
... Multiple Output LoadSHARE™ PWM ® Dim Recommended Solder Pad Layout 7.50mm 6.10mm 5.20mm 0.25mm 3.15mm Microsemi Integrated Products Division LX1675 RODUCTION ATA HEET M I ILLIMETERS NCHES MIN MAX MIN MAX 0.80 1.00 0.031 0.039 0 0.05 0 0.002 0.20 REF 0.008 REF 0.18 0.30 0.007 0.011 5 ...
Page 19
... TM PRODUCTION DATA – Information contained in this document is proprietary to Microsemi and is current as of publication date. This document may not be modified in any way without the express written consent of Microsemi. Product processing does not necessarily include testing of all parameters. Microsemi reserves the right to change the configuration and performance of the product and to discontinue product at any time. Copyright © ...