lx1677 Microsemi Corporation, lx1677 Datasheet
lx1677
Related parts for lx1677
lx1677 Summary of contents
Page 1
... J RoHS Compliant / Pb-free Transition DC: 0518 Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1677CLQ-TR) Copyright © 2000 Rev 1.1, 2003-03-03 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 ® AMD64 Processor VRM Controller maximizing regulator response ...
Page 2
... DFOUT EO1 EA1- DACOUT PWGD GND VIN ROSC ENA VID4 VID3 VID2 VID1 VID0 20 VS2 ACKAGE (Top View) RoHS / Pb-free 100% Matte Tin Lead Finish LX1677 Symbol Min Typ Max VCC 4.5 5.5 VIN 5.7 24.0 VS1, VS2 0 24.0 VS3 0 5.5 VS3 I-MAX VC3 VC1 HO1 ...
Page 3
... Rev 1.1, 2003-03-03 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 ® AMD64 Processor VRM Controller Description for phase 1. DS(ON) Microsemi Integrated Products Division LX1677 D S RODUCTION ATA HEET Page 3 ...
Page 4
... VIN = 24V V V =1. 2mA EO2(MAX) EA2 -20µA EO2(MIN) EA2 UGBW Microsemi Integrated Products Division LX1677 RODUCTION ATA HEET ≤ ≤ T 70°C except where A LX1677 Min Typ Max 0 1. -100 100 60 70 0.8 2.5 4.0 0.15 0 0.99 1 1.01 65 ...
Page 5
... VCCL - PGN = 5.0 V, Load = 3300pf at I LOx <500nSec I ILIM1 t CSD(ILIM1) I ILIM3 t CSD(ILIM3 -3mA PWGD PWGD Microsemi Integrated Products Division LX1677 D S RODUCTION ATA HEET ≤ ≤ T 70°C except where A LX1677 Units Min Typ Max -6 6 0.98 1 1.02 60 180 4 MHz 4.8 4.9 0.1 0.2 4.8 4.9 0.1 0.2 1 1.5 ...
Page 6
... Microsemi Integrated Products Division LX1677 D S RODUCTION ATA HEET ≤ ≤ T 70°C except where A LX1677 Units Min Typ Max 4.2 0.3 5.5 0.3 1.85 0.725 -20 1 ≤ DACOUT 1 1.5 0.5 1.3 2 0.3 V (V) OUT 1.150 1 ...
Page 7
... UVLO IMAX + _ 35mV + offset VCCL _ 35mV IMIN _ offset + ENA ILIM PGN3 I-Min VS3 I-Max Microsemi Integrated Products Division LX1677 RODUCTION ATA HEET VCCL I-MAX I-MIN I-MIN I-MAX Phase 2 Integrating + - Amp 100K 90K 90K Phase 2 Differential Amp ...
Page 8
... R7 4.02K U1 +5VP 1 FB- NDS7002A C26 0.22uF 2 10K DFOUT R19 4700pF EO1 4 EA1- 5 NDS7002A DACOUT Q7 6 LX1677 LQ PWRGD 7 GND C10 10uF 25V 8 VIN R9 45.3K VBAT 9 ROSC R10 1.00K 10 ENA 11 VID4 12 R11 100K VID3 R12 100K R13 100K R14 100K R15 100K +5VP R22 1 ...
Page 9
... URRENT ROTECTION There are two separate current limit circuits in the LX1677. One looks at the phase 1 lower MOSFET drain current and the second looks at the phase 3 upper MOSFET drain current. Both circuits have a 400 nS delay before a current limit command is issued to the current limit latch, once set the current limit latch will hold all three phases off until it is reset ...
Page 10
... DACOUT pin and the PWGD output in high. PWM F REQUENCY An external resistor sets the PWM frequency from the ROSC pin to ground. The equation for ROSC is: where ROSC is in Ω Hz, K=105e-12 Both Microsemi Integrated Products Division LX1677 RODUCTION ATA HEET 1 ROSC = ...
Page 11
... With the LoadSHARE imbalance the phases so that one phase will supply more current than the other under unique situations. The LX1677 will normally be used with the same supply voltages on phase 1 and 2 PWM inputs and will have equal currents in both phases ...
Page 12
... Under normal operation the Transient Correction phase is only active for a very brief time during high di/dt loads on the output. DACOUT 35mV 35mV Figure 6 – Phase 3 Transient Correction Loop Microsemi Integrated Products Division LX1677 D S ATA HEET low if an +5V VC3 - I-Max I-Max Vout ...
Page 13
... D × capacitor should be rated to handle the RMS current s f requirements. The RMS current is: Where I The maximum RMS value of 0.25I 25% or 75%. Microsemi Integrated Products Division LX1677 RODUCTION ATA HEET A capacitor that satisfies the ESR ( ) ESR I ∆ ...
Page 14
... The DAC inputs are the Voltage Identification (VID) 0-4 lines, the VID table lists the available output voltages for the corresponding VID codes. There are no external resistor dividers to program output voltage and only the steps listed are available. Microsemi Integrated Products Division LX1677 RODUCTION ATA HEET ...
Page 15
... Dim *LC Microsemi Integrated Products Division LX1677 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 5.00 BSC 0.196 BSC 3 ...
Page 16
... Copyright © 2000 Rev 1.1, 2003-03-03 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 ® AMD64 Processor VRM Controller P RODUCTION Microsemi Integrated Products Division LX1677 D S ATA HEET Page 16 ...