NX2422 Datasheet | Microsemi

TWO PHASE SYNCHRONOUS PWM CONTROLLER WITH INTEGRATED FET DRIVER, DIFFERENTIAL CURRENT SENSE & 5V BIAS REGULATOR PRELIMINARY DATA SHEET Pb Free Product The NX2422 is a two-phase PWM controller with inte- n Differential inductor DCR sensing eliminates the problem with layout parasitic grated FET driver designed for low voltage high current n 5V bias regulator available application. The two phase synchronous buck converter n Low Impedance On-board Drivers offers ripple cancelation for both input and output. The n Hiccup current limit and IOUT indication NX2422 uses differential remote sensing using either curn Power Good for power sequencing rent sense resistor or inductor DCR sensing to achieve n EN2_B pin allows the slave channel on and off while accurate current matching between the two channels. the master channel is working Differential sensing eliminates the error caused by PCB n Programmable frequency board trace resistance that otherwise presents when usn Prebias start up ing a single ended voltage sensing. In addition the NX2422 offers high drive current capabil- n OVP without negative spike at output ity especially for keeping the synchronous MOSFET off n Selectable between internal and external reference during SW node transition, can provide regulated 5V to n Internal Schottky diode from PVCC to BST IC biasing and drivers via 5V bias regulator, allows the n Pb-free and Ro HS pliant slave channel on and off via EN2_B pin while the main channel is working. Other Features : PGOOD output, pro- n Graphic card High Current Vcore Supply grammable switching frequency and hiccup current lim- n High Current on board DC to DC converter iting circuitry. applications 12V BUS R10 2N3904 DESCRIPTION Features APPLICATIONS TYPICAL APPLICATION C11 C10 VCCDRV 2N3904 BST1 C12 HDRV1 SW1 Q1 L1 5V R13 R14 VOUT C13 Q2 R29 C15 C14 C31 R11 C30 PVCC LDRV1 5VCC REFIN AGND CSP R16 R17 C28 CS+1 R28 CS-1 R15 C29 C17 BST2 C19 HDRV2 SW2 Q3 C18 RT...