LX1671CLQ Microsemi Analog Mixed Signal Group, LX1671CLQ Datasheet
LX1671CLQ
Specifications of LX1671CLQ
Available stocks
Related parts for LX1671CLQ
LX1671CLQ Summary of contents
Page 1
... 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 Memory Core DDR Memory Plastic MLPQ 38-Pin LX1671CLQ Page 1 ...
Page 2
Supply Voltage ( ................................................................-0.3V to 5.5V CC Supply Voltage (V ) Transient ......................................................-0.3V to 6.0V ...
Page 3
TM N AME Bi-Phase Operation: Phase 1 and 2 Voltage Feedback Single Phase Operation: Phase 1 Voltage Feedback , connect to the output through a resistor network to set FB1 desired output voltage of Phase 1 Error Amplifier Output – ...
Page 4
TM Unless otherwise specified, the following specifications apply over the operating ambient temperature 0°C otherwise noted and the following test conditions: V Parameter SWITCHING REGULATORS Input Voltage Operation Current Reference Voltage Line Regulation (Note 2) Load Regulation (Note 2) Minimum ...
Page 5
Unless otherwise specified, ...
Page 6
TM CSX CS Comp - I RESET + V VSX I TRIP SET EOX Error Comp + - - FBX + Amplifier/ Compensation V REF 20k SS/ENABLE VOUT4 Copyright © 2000 Rev. 1.2b, 2006-02-13 11861 Western Avenue, ...
Page 7
TM CS2 CS Comp - + VS2 V I TRIP SET EO2 LPF2 Error Comp + - - FB2 + Amplifier/ Compensation V REF RF2 20k LPF1 P HASE1 SS/ENABLE CSS Figure 3 – Block Diagram of Phase 2 Connected ...
Page 8
TM +5V VOUT4 Figure 4 – Bi-Phase Operation With Phase 1 and 2 LoadSHARing From 12V and 5V (Phase 2 high-side MOSFET driver bootstrapped to 17V) Copyright © 2000 Rev. 1.2b, 2006-02-13 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, ...
Page 9
TM LO1 PG1 LO2 H02 VC2 LDGD LDFB LDDIS DGND LX1671 AGN D RSVD SS2 RF2 FB2 EO2 CS2 VS2 SS1 FB1 Copyright © 2000 Rev. 1.2b, 2006-02-13 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 ® Multiple ...
Page 10
TM +3.3V +5V VOUT2 Figure 6 – Bi-Phase Operation With Phase 1 and 2 LoadSHARing From 3.3V and 5V Copyright © 2000 Rev. 1.2b, 2006-02-13 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 ® Multiple Output LoadSHARE™ PWM ...
Page 11
ENERAL ESCRIPTION The LX1671 is a voltage-mode pulse-width modulation controller integrated circuit. The internal ramp generator frequency is fixed to 300kHz. The device has external compensation, for more flexibility of output current magnitude (UVLO) ...
Page 12
SHARE (ESR M I HASE OAD ETHOD The first method is to change the ratio of the inductors ...
Page 13
L1, Switch Side 100 62k LPF1 Not Resistor Used Divider L2, Resistor Switch Side Divider LPF2 62k 62k 100 TBD 4700pF Where ...
Page 14
SHARE (P I HASE OAD ROPORTIONAL The best topology for generating a current ratio at full load and ...
Page 15
The circuit in Figure 9 sums a current through a 1MΩ ...
Page 16
UTPUT NDUCTOR The output inductor should be selected to meet the requirements of the output voltage ripple in steady-state operation and the inductor current slew-rate during transient. The peak-to- peak output voltage ripple is: = × V ...
Page 17
NPUT APACITOR The input capacitor and the input inductor, if used, are to filter the pulsating current generated by the buck converter to reduce interference to other circuits connected to the same 5V rail. In addition, the ...
Page 18
UTPUT NABLE The LX1671 MOSFET driver outputs are shut off by pulling the soft-start pin below 0.3V. The LDO voltage regulator has its own Enable/Disable pin (LDDIS) for control of this output voltage ...
Page 19
The power N-MOSFET transistor’s total gate charge spec, (Qg) ...
Page 20
TM PW 38-Pin Thin Small Shrink Outline (TSSOP 38-Pin Plastic MLPQ (5x7mm EP Note: Dimensions do not include mold flash or protrusions; these shall not exceed 0.155mm(0.006”) on any side. Lead dimension ...
Page 21
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 ...