NX2150 Datasheet | NEXSEM

DESCRIPTION The NX2150 controller IC is a single power supply syn- n chronous Buck controller IC designed for step down DC n to DC converter applications. NX2150 is optimized to n convert bus voltages from 5V to 24V to outputs as low n as 0.8V voltage. An internal regulator converts bus n voltage to 5V, which provides voltage supply to internal n logic and driver circuit. The NX2150 has programmable frequency feature and operates at 300k Hz when Rt pin n is open. The NX2150 employs fixed loss-less current limiting by sensing the Rdson of synchronous MOSFET n followed by hiccup feature .Feedback under voltage trig- n gers Hiccup. n Other features of the device are: Over voltage protec- tion, thermal shutdown, 5V gate drive, Adaptive deadband n control, Internal digital soft start, Vcc undervoltage lock out and shutdown capability via the p pin. n n n n n PRELIMINARY DATA SHEET Pb Free Product FEATURES Single voltage supply from 5V to 24V Programmable frequency Internal Digital Soft Start Function Prebias Startup Less than 50 n S adaptive deadband Current limit triggers hiccup by sensing Rdson of Synchronous MOSFET No negative spike at Vout during startup and shutdown Over Voltage triggers latch out Power Good indicator available Pb-free and Ro HS pliant APPLICATIONS LCD TV Graphic Card on board converters Memory Vddq Supply in mother board applications On board DC to DC such as 12V to 3.3V, 2.5V or 1.8V Hard Disk Drive Set Top Box TYPICAL APPLICATION VIN1 +7V~24V 8 VIN BST 16 14 PVCC HDRV 1 SW 15 13 VCC OCP 10 LDRV 3 5 PGOOD PGND 2 FB 11 P 12 4 RT AGND(PAD) Q1(half) Q1(half) VOUT1 +5V@4A Device NX2150CMTR Figure1 - Typical application of 2150 ORDERING INFORMATION Temperature 0 to 70o C Package MLPQ -16L Frequency 300k Hz to 1MHz Pb-Free Yes Rev.1.0 11/15/06 .nexsem. NEXSEM ABSOLUTE MAXIMUM RATINGS(NOTE1) VCC,PVCC to GND & BST to SW voltage 6.5V BST to GND Voltage 35V VIN...