NX2415CMTR

Evaluation board available. NX2415 TWO PHASE SYNCHRONOUS PWM CONTROLLER WITH INTEGRATED FET DRIVER AND DIFFERENTIAL CURRENT SENSE PRELIMINARY DATA SHEET Pb Free Product The NX2415 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 External programmable voltage droop application. The two phase synchronous buck converter offers ripple cancelation for both input and output. The n Low Impedance On-board Drivers NX2415 uses differential remote sensing using either n Hiccup current limit current sense resistor or inductor DCR sensing to achieve n Power Good for power sequencing accurate current matching between the two channels. n Enable Signal allows external shutdown as well as programming the BUS voltage start up threshold Differential sensing eliminates the error caused by PCB n Programmable frequency board trace resistance that is otherwise is present when using a single ended voltage sensing. In addition the n Prebias start up NX2415 offers high drive current capability especially for n Over voltage protection without negative spike at output keeping the synchronous MOSFET off during SW node n Pb-free and RoHS compliant transition, accurate programmable droop allowing to reduce number of output capacitors, accurate enable circuit provides programmable start up point for Bus volt- n Graphic card High Current Vcore Supply age, PGOOD output, programmable switching frequency n High Current +40A on board DC to DC converter and hiccup current limiting circuitry. applications 10 31 1uF 23 1uF 24 25 26 22 21 620 0.22uF 2.15 M1 0.68uH DESCRIPTION FEATURES APPLICATIONS TYPICAL APPLICATION +5V 10k 6.49k VCC EN PVCC1 +5V 2 x 10uF 1uH 30 BST1 HDRV1 VIN1 +12V 100uF 180uF +12V 1.65k op 45.3k 10k 29 7 2 28 11 ENBUS DROOP SW1 LDRV1 VOUT +1.2V/50A 2 x (1000uF,7mohm ESR) M2 620 1uF +5V NX2415 RT PGOOD CSCOMP PGND1 CS+1 9 CS-1 10 PVCC2 18 1uF 17 16 15 19 20 620 0.22uF 2.15 M3 0.68uH VOUT 430 220nF 2.2nF +5V 10uF 3 PGSEN 1nF 10k 20k 1.8nF 3.92k 5.62k 10k 2N3906 1k 180k 10nF 1nF 20k BST2 HDRV2 SW2 LDRV2 6.8nF 5 FB 6 VCOMP 150pF 10nF 100k M4 620 1uF 4 VP 8 OCP 1 VREF 14 PGND2 12 CS+2 CS-2 13 IOUT AGND 32 Figure1 - Typical application of NX2415 ORDERING INFORMATION Device NX2415CMTR Rev.4.8 05/06/08 Temperature 0 to 70oC Package MLPQ-32L Frequency 200kHz to 1MHz Pb-Free Yes 1 NX2415 ABSOLUTE MAXIMUM RATINGS Vcc to PGND & BST to SW voltage .................... -0.3V to 6.5V 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 Lead temperature(Soldering 5s) ........................... 260oC 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 32-LEAD PLASTIC MLPQ 5 x 5 PGOOD ENBUS VCC SW1 NC EN HDRV1 24 BST1 23 PVCC1 22 LDRV1 AGND VREF RT PGSEN VP FB COMP DROOP OCP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 CS-1 CSCOMP HDRV2 CS+1 IOUT CS-2 CS+2 SW2 32 31 30 29 28 27 26 25 NX2415 21 PGnd1 20 PGnd2 19 LDRV2 18 PVCC2 17 BST2 θ JA ≈ 35o C /W ELECTRICAL SPECIFICATIONS Unless otherwise specified, these specifications apply over Vcc = 5V, V BST-VSW =5V, EN=HIGH, 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 Supply Voltage(Vcc) VCC ,PVCC Voltage Range VCC Supply Current (static) PVCC Supply Current (Dynamic) VBST Voltage Range VBST Supply Current ((Dynamic)) SYM VCC TEST CONDITION MIN 4.5 - TYP 5 6.6 4 MAX 5.5 UNITS V mA mA ICC (Static) EN=LOW EN&ENBUS HIGH, ICC Freq=200Khz per phase (Dynamic) CLOAD=2200PF VBST to VSW EN&ENBUS HIGH, VBST Freq=200Khz per phase (Dynamic) CLOAD=2200PF 4.5 5 4 5.5 V mA Rev.4.8 05/06/08 2 NX2415 PARAMETER Under Voltage, Vcc , Enable(EN) & ENBUS VCC-Threshold VCC-Hysteresis EN Threshold EN Hysteresis ENBUS Threshold ENBUS Hysteresis Reference Voltage Ref Voltage Ref Voltage line regulation Oscillator (Rt) Frequency for each phase Ramp-Amplitude Voltage Ramp Peak Ramp Valley Max Duty Cycle Min Duty Cycle Transconductance Amplifiers(CSCOMP) Open Loop Gain Transconductance Voltage Mode Error Amplifier Open Loop Gain Input Offset Voltage Output Current Source Output Current Sink Output HI Voltage Output LOW Voltage SS (Internal ) Soft Start time Power Good(Pgood) Threshold Hysteresis PGood Voltage Low High Side Driver(CL=4700pF) Output Impedance , Sourcing Current Output Impedance , Sinking Current Rise Time Fall Time Deadband Time Rsource(Hdrv) Rsink(Hdrv) THdrv(Rise) THdrv(Fall) I=200mA I=200mA VBST-VSW=4.5V VBST-VSW=4.5V 1.1 0.8 24 24 30 ohm ohm ns ns ns Vio_v 5 5 Vcc-1.5 0.5 Tss 200Khz/Phase VSEN Falling IPGood=-5mA 20 74 5 0.5 SYM TEST CONDITION MIN TYP MAX UNITS VCC_UVLO VCC_Hyst VCC Rising Vcc Rising VBUS Rising 4 0.2 0.6 0.1 1.6 0.16 0.8 1 V V V V V V V % KHz V V V % % VREF 4.5V