NX2114

Evaluation board available. NX2114/2114A 300kHz & 600kHz SYNCHRONOUS PWM CONTROLLER PRELIMINARY DATA SHEET Pb Free Product 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. Vin +5V C4 47uF,70mohm R5 10 C8 47uF,70mohm C6 1uF 5 1 D1 MBR0530T1 C5 1uF M1 L1 1.5uH Cin 220uF,12mohm FEATURES n n n n n n n n 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 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 L2 1uH Vcc 7 OFF R6 10k ON 2N3904 R7 10k C1 47pF C2 1.5nF R4 22.1k 6 BST C7 0.1uF 2 NX2114 Comp Hdrv SW Ldrv 8 Fb Gnd 3 4 M2 Co 2 x (220uF,15mohm) Vout +1.6V,6A R2 10.2k R1 10.2k R3 1.5k C3 2.2nF Figure1 - Typical application of 2114 ORDERING INFORMATION Device NX2114CSTR NX2114ACSTR Temperature 0 to 70oC 0 to 70o C Package SOIC-8L SOIC-8L Frequency 300kHz 600kHz Pb-Free Yes Yes Rev. 4.0 06/20/06 1 NX2114/2114A (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. ABSOLUTE MAXIMUM RATINGS PACKAGE INFORMATION 8-PIN PLASTIC SOIC (S) 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 = 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) Supply Voltage(VBST) VBST Supply Current (Static) VBST Supply Current (Dynamic) Under Voltage Lockout VCC-Threshold VCC-Hysteresis SYM VREF Test Condition 4.5V