NX2114CSTR

Evaluation board available. NX2114/2114A 300kHz & 600kHz SYNCHRONOUS PWM CONTROLLER PRELIMINARY DATA SHEET Pb Free Product FEATURES DESCRIPTION The NX2114 controller IC is a synchronous Buck controller IC designed for step down DC to DC converter applications. Synchronous control operation replaces the traditional catch diode with an Nch MOSFET resulting in improved converter efficiency. Although the NX2114 controller is optimized to convert single 5V bus voltages to supplies as low as 0.8V output voltage, however using a few external components it can also be used for other input supplies such as 12V input (See NX2113 data sheet for more optimized solution). The NX2114 operates at 300kHz while 2114A is set at 600kHz operation which together with less than 50 nS of dead band provides an efficient and cost effective solution. Other features of the device are: Internal digital soft start; Vcc undervoltage lock out; Output undervoltage protection with digital filter and shutdown capability via the enable pin. +5V APPLICATIONS n n n n n Graphic Card on board converters Memory Vddq Supply in mother board applications On board DC to DC such as 5V to 3.3V, 2.5V or 1.8V Hard Disk Drive Set Top Box TYPICAL APPLICATION C4 47uF,70mohm R5 10 5 1 Vcc BST Comp NX2114 7 OFF R6 10k C2 1.5nF 2N3904 C1 47pF D1 MBR0530T1 C6 1uF C8 47uF,70mohm R7 10k Synchronous Controller in 8 Pin Package Bus voltage operation from 2V to 25V Single 5V Supply Operation Short protection with feedback UVLO Internal 300kHz for 2114 and 600kHz for 2114A Internal Digital Soft Start Function Shut Down via pulling comp pin low Pb-free and RoHS compliant L2 1uH Vin ON n n n n n n n n R4 22.1k 6 Hdrv 2 C5 1uF Cin 220uF,12mohm M1 L1 1.5uH SW Ldrv Fb C7 0.1uF 8 4 Vout +1.6V,6A Co 2 x (220uF,15mohm) M2 Gnd 3 R1 10.2k R2 10.2k R3 1.5k C3 2.2nF Figure1 - Typical application of 2114 ORDERING INFORMATION Device NX2114CSTR NX2114ACSTR Rev. 4.0 06/20/06 Temperature 0 to 70oC 0 to 70o C Package SOIC-8L SOIC-8L Frequency 300kHz 600kHz Pb-Free Yes Yes 1 NX2114/2114A ABSOLUTE MAXIMUM RATINGS (NOTE1) Vcc to GND & BST to SW voltage ................... 6.5V BST to GND Voltage ...................................... 35V Storage Temperature Range ............................. -65oC to 150oC Operating Junction Temperature Range ............. -40oC to 125oC NOTE1: 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-PIN PLASTIC SOIC (S) θJA ≈ 130o C/W BST 1 HDrv 2 8 SW 7 Comp Gnd 3 6 Fb LDrv 4 5 Vcc ELECTRICAL SPECIFICATIONS Unless otherwise specified, these specifications apply over Vcc = 5V, and TA = 0 to 70oC. Typical values refer to TA = 25oC. Low duty cycle pulse testing is used which keeps junction and case temperatures equal to the ambient temperature. PARAMETER Reference Voltage Ref Voltage Ref Voltage line regulation Supply Voltage(Vcc) VCC Voltage Range VCC Supply Current (Static) VCC Supply Current (Dynamic) VCC ICC (Static) Outputs not switching ICC CLOAD=3300pF FS=300kHz (Dynamic) Supply Voltage(VBST) VBST Supply Current (Static) IBST (Static) Outputs not switching VBST Supply Current (Dynamic) IBST CLOAD=3300pF (Dynamic) Under Voltage Lockout VCC-Threshold VCC-Hysteresis VCC_UVLO VCC Rising VCC_Hyst VCC Falling Rev. 4.0 06/20/06 SYM VREF Test Condition Min 4.5V