LX1672
TM ®
Multiple Output LoadSHARE™ PWM
P RELIMINARY D ATA S HEET
DESCRIPTION
KEY FEATURES
WWW . Microsemi . C OM...
LX1672
TM ®
Multiple Output LoadSHARE™ PWM
P RELIMINARY D ATA S HEET
DESCRIPTION
KEY FEATURES
WWW . Microsemi . C OM
The LX1672 is a highly integrated power supply controller IC featuring www.DataSheet4U.net two PWM switching regulator stages with an additional onboard linear regulator driver. The two constant frequency
voltagemode PWM phases can be easily configured as a single Bi-Phase high current output, two independently regulated outputs, or as a DDR memory I/O supply with a tracking DDR termination
voltage supply. Power loss and noise, due to the ESR of the input
capacitors, are minimized by operating each PWM output 180° out of phase. This architecture also minimizes capacitor requirements while maximizing regulator response. In bi-phase operation, the high current output utilizes a patented current sharing architecture, called Forced Current Sharing†, to allow accurate current sharing without the use of expensive current sense resistors.
This patented approach also gives system designers maximum flexibility with respect to
MOSFET supply. Each phase can utilize different supply
voltages, for efficient use of available supplies, while programming the ratio of current pulled from each using one of three methods (see application section). The LX1672 incorporates fully programmable soft-start sequencing capabilities. Each output can be configured to come up in any order necessary as required by the application. The LX1672 features an additional Linear Regulator Driv...