NX2307CSTR

NX2307 SINGLE SUPPLY 12V SYNCHRONOUS PWM CONTROLLER ADVANCE DATA SHEET Pb Free Product DESCRIPTION The NX2307 controller IC is a compact synchronous Buck controller IC with 8 lead SOIC8 package designed for step down DC to DC converter applications. The NX2307 controller is optimized to convert single supply 12V bus voltage to as low as 0.8V output voltage. Internal UVLO keeps the regulator off until the supply voltage exceeds 7V where internal digital soft starts get initiated to ramp up output. The NX2307 employs fixed current limiting followed by HICCUP feature. Other features includes: 12V gate drive capability , Converter Shutdown by pulling COMP pin to Gnd, Adaptive dead band control. FEATURES n 12V Gate Driver n Bus voltage operation from 7V to 15V n Fixed hiccup current limit by sensing Rdson of Synchronous MOSFET n Internal 300kHz n Internal Digital Soft Start Function n Adaptive deadband Control n Shut Down via pulling COMP pin n Pb-free and RoHS compliant APPLICATIONS n n n n Graphic Card on board converters Vddq Supply in mother board applications On board DC to DC such as 12V to 3.3V, 2.5V or 1.8V Set Top Box and LCD Display TYPICAL APPLICATION Vin +12V C4 100uF L2 1uH C5 1uF D1 MBR0530T1 Cin 16SVP180M 16V,180uF R6 10 C3 1uF 5 1 Vcc 7 BST Hdrv 2 C6 0.1uF M1 IRFR3706 L1 1.5uH HI=SD M3 NX2307 COMP R4 5.36k C7 200pF C2 6.8nF SW Ldrv 8 4 R1 1.43k M2 IRFR3706 C1 2.7nF 6 FB Gnd 3 R2 10k Co 4SEPC560M 560uF,7mohm Vout +1.8V 10A R3 8k Figure1 - Typical application of NX2307 ORDERING INFORMATION Device NX2307CSTR Temperature 0 to 70oC Package SOIC - 8L Frequency 300kHz Pb-Free Yes Rev. 3.2 06/22/06 1 NX2307 ABSOLUTE MAXIMUM RATINGS Vcc to PGND & BST to SW voltage .................... -0.3V to 16V BST to PGND Voltage ...................................... -0.3V to 35V SW to PGND .................................................... -2V to 35V All other pins .................................................... -0.3V to 6.5V Storage Temperature Range ............................... -65oC to 150oC Operating Junction Temperature Range ............... -40oC to 125oC ESD Susceptibility ........................................... 2kV CAUTION: Stresses above those listed in "ABSOLUTE MAXIMUM RATINGS", may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. PACKAGE INFORMATION 8-LEAD PLASTIC SOIC θJA ≈ 130o C/W BST 1 HDrv 2 Gnd 3 LDrv 4 8 SW 7 COMP 6 Fb 5 Vcc ELECTRICAL SPECIFICATIONS Unless otherwise specified, these specifications apply over Vcc =12V, VBST-VSW =12V, and T A = 0 to 70oC. Typical values refer to TA = 25oC. PARAMETER SYM Test Condition Min TYP MAX Units Reference Voltage Ref Voltage VREF 0.8 V Ref Voltage line regulation 10V