NX2147

NX2147 SINGLE CHANNEL MOBILE PWM CONTROLLER WITH DYNAMIC VOLTAGE ADJUSTMENT PRODUCTION DATA SHEET Pb Free Product The NX2147 controller IC is a step down switching con- n troller with ability to dynamically adjust the output volt- n age designed for applications such as Graphic Proces- n sor Core voltage in Notebook PC products. It allows n this by adjusting the reference input of the PWM n comprator as oppose to the traditional method of feedback adjustment. This device has three mode of opera- n tions; a) Constant ON Time Synchronous Mode, b) Non Synchronous PFM mode or c) Ultrasonic PFM mode of n operation. When selected in Non Synchronous mode, the device automatically disables the synchronous MOSFET in order to improve efficiency at light load. n This device provides excellent dynamic response and n nearly constant frequency for operation from 4.5V to n 24V of input voltage operation. Other features of the n device are; internal logic level signal MOSFETs for output dynamic voltage adjustment, internal boost schotcky n diode, less than 1uA VIN shutdown current, adjustable n current limiting using lower MOSFET Rds-On and feed- n back UVLO followed by latchdown, overvoltage protection , internal digital soft start and soft stop shutdown n using and internal 20 ohm MOSFET pull down. DESCRIPTION FEATURES Output voltage can be dynamically changed Internal Boost Schottky Diode Ultrasonic mode operation available Bus voltage operation from 4.5V to 24V Less than 1uA VIN shutdown current with Enable low Excellent dynamic response with constant on time control Selectable between Synchronous CCM mode and diode emulation mode to improve efficiency at light load Programmable switching frequency Current limit and FB UVLO with latch off Over voltage protection with latch off Pb-free and RoHS compliant APPLICATIONS Notebook PCs and Desknotes Tablet PCs/Slates On board DC to DC such as 12V to 3.3V, 2.5V or 1.8V Hand-held portable instruments TYPICAL APPLICATION 1MEG VIN 7V~22V 2x10uF GPIO0 GPIO1 VOUT(V) 1 1 1.17 0 1 1.09 1 0 0.95 0 0 0.9 5V 10 1u 1u 9 2 PVCC TON VCC 16 1n 15 14 6 ENSW /MODE GPIO0 GPIO1 HDRV 12 BST 13 SW 11 2.2 1u FDS6294 NX2 1 4 7 1uH Vout (see table above) /12A 2R5TPE330MC 330uF 10 VREF_OC 100k 3 VP 0.1u 10n 634k 5 D0 88.7k 200k 4 LDRV 8 FDS6676AS LOAD PGND 7 D1 VOUT AGND 6 1 Figure1 - Typical application of NX2147 ORDERING INFORMATION Device NX2147CMTR Rev. 1.6 Rev. 1.8 03/09/09 12/28/09 Temperature -10o C to 100o C Package 3X3 MLPQ-16L Pb-Free Yes 1 NX2147 ABSOLUTE MAXIMUM RATINGS VCC,PVCC to GND & BST to SW voltage ............ -0.3V to 6.5V VIN,TON to GND .................................................. -0.3V to 28V HDRV to SW Voltage .......................................... -0.3V to 6.5V SW to GND ......................................................... -2V to 30V All other pins ........................................................ VCC+0.3V Storage Temperature Range ..................................-65oC to 150oC Operating Junction Temperature Range .................-40oC to 150oC 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 3x3 16-LEAD PLASTIC MLPQ ENSW/MODE θ JA ≈ 46o C/W GPIO0 14 TON 16 VOUT 1 VCC VP D1 2 3 4 5 D0 15 13 12 HDRV BST 11 SW 10 VREF_OC 9 PVCC 8 LDRV SYM 17(PAD) AGND 6 GPIO1 7 PGND ELECTRICAL SPECIFICATIONS Unless otherwise specified, these specifications apply over Vcc =5V, VIN=15V and TA =25oC, unless otherwise specified. PARAMETER VIN Recommended voltage range Shut down current VCC,PVCC Supply Input voltage range Operating quiescent current Shut down current Rev. 1.6 Rev. 1.8 03/09/09 12/28/09 Test Condition Min 4.5 TYP MAX 24 Units V uA V mA uA ENSW=GND Vcc No switching, ENSW=5V ENSW=GND 4.5 1 5.5 1.6 1 2 NX2147 PARAMETER VCC UVLO Under-voltage Lockout threshold Falling VCC threshold ON and OFF time TON operating current ON -time Minimum off time VREF_OC voltage VREF_OC voltage Line regulation OUTPUT voltage Output range VOUT shut down discharge resistance Soft start time GPIO threshold Output high Output low DO,D1 internal pull down MOSFET impedance SW zero cross comparator Offset voltage High Side Driver (CL=3300pF) Output Impedance , Sourcing Current Output Impedance , Sinking N Current Rise Time Fall Time Deadband Time Low Side Driver (CL=3300pF) Output Impedance, Sourcing Current Output Impedance, Sinking Current Rise Time Fall Time Deadband Time Over temperature Threshold Hysteresis 2 0 SYM VCC _UVLO 4.1 3.9 VIN=15V, Rton=1Mohm VIN=9V,VP=VOUT=0.75V,Rt on=499k 380 2.475 -2 0 ENSW/MODE=GND 30 1.5 5 0.8 15 390 590 2.5 V V uA ns ns V % V ohm ms V V Test Condition Min TYP MAX Units 800 2.525 2 5.5 VCC from 4 to 5.5 13 5 mohm mV R source(Hdrv) R sink (Hdrv) I=200mA I=200mA 1.5 1.5 50 50 30 ohm ohm ns ns ns THdrv(Rise) 10% to 90% THdrv(Fall) 90% to 10% Tdead(L to Ldrv going Low to Hdrv going H) High, 10% to 10% R source(Ldrv) Rsink(Ldrv) I=200mA I=200mA 1.5 0.5 50 50 10 ohm ohm ns ns ns TLdrv(Rise) 10% to 90% TLdrv(Fall) 90% to 10% Tdead(H to SW going Low to Ldrv going L) High, 10% to 10% 155 15 o o C C Rev. 1.6 Rev. 1.8 03/09/09 12/28/09 3 NX2147 PARAMETER ENSW/MODE threshold and bias current PFM/Non Synchronous Mode Ultrasonic Mode Synchronous Mode Shutdown mode Input bias current Under voltage protection Under voltage trigger point Over voltage protection Over voltage tripp point Internal Schottky Diode Forward voltage drop Leave it open or use limits in spec ENSW/MODE=VCC ENSW/MODE=GND SYM Test Condition Min TYP MAX Units 80% V CC 60% V CC 2 0 1 -1 70 125 forward current=50mA 500 VCC+0 .3V 80% VCC 60% VCC 0.8 V V V V uA uA %VP %VP mV Rev. 1.6 Rev. 1.8 03/09/09 12/28/09 4 NX2147 PIN DESCRIPTIONS PIN NUMBER PIN SYMBOL 1 VOUT PIN DESCRIPTION This pin is directly connected to the output of the switching regulator and senses the VOUT voltage. An internal MOSFET with 20ohms rdson discharges the output during turn off. This pin supplies the internal 5V bias circuit. A 1uF X7R ceramic capacitor is placed as close as possible to this pin and ground pin. This pin is connected via resistor divider to VREF_OC pin to set the output DC voltage from 0.5V to VREF 2.5V. This pin is a drain of an internal signal MOSFET. When it is connected via resistor to the VP pin,and the GPIO0 pin is set low, it reduces the VP voltage by paralleling this resistor to the fixed resistor from VP to GND. This pin is a drain of an internal signal MOSFET. When it is connected via resistor to the VP pin,and the GPIO_1 pin is set low, it reduces the VP voltage by paralleling this resistor to the fixed resistor from VP to GND. A logic level input signal that controls the D1 pin. A low signal turns the internal D1 MOSFET on and a High turns it off. Power ground. Low side gate driver output. Provide the voltage supply to the lower MOSFET drivers. Place a high frequency decoupling capacitor 1uF X5R to this pin. Reference output voltage. A resistor divider from this pin to VP pin sets the output voltage. The total resistance from this pin to GND also sets the OCP threshold voltage. Note that when GPIO0 and GPIO1 pins are high the reference divider is at its highest voltage. The nominal voltage of Vref is 2.5V. This pin is connected to source of high side FETs and provide return path for the high side driver. It is also the input of zero current sensing comparator. High side gate driver output. This pin supplies voltage to high side FET driver. A high freq 1uF X7R ceramic capacitor and 2.2ohm resistor in series are recommended to be placed as close as possible to and connected to this pin and SW pin. A logic level input signal that controls the D0 pin. A low signal turns the internal D0 MOSFET on and a High turns it off. Switching converter enable input. Connect to VCC for PFM/Non synchronous mode, connected to an external resistor divider equals to 70%VCC for ultrasonic, connected to GND for shutdown mode, floating or connected to 2V for the synchronous mode. VIN sensing input. A resistor connects from this pin to VIN will set the frequency. A 1nF capacitor from this pin to GND is recommended to ensure the proper operation. Analog ground. 2 3 4 VCC VP D1 5 6 7 8 9 10 D0 GPIO1 PGND LDRV PVCC VREF_OC 11 12 13 14 15 SW HDRV BST GPIO0 ENSW/ MODE 16 TON 17 PAD Rev. 1.6 Rev. 1.8 03/09/09 12/28/09 5 NX2147 BLOCK DIAGRAM VCC(2) Bias 4.3/4.1 Disable_B Thermal shutdown ON time pulse genearation R S Q POR BST(13) VIN start HD ODB HDRV(12) FET Driver HD_IN SW(11) 5V PVCC(9) LDRV(8) R1 VP(3) R2 soft start VCC 1M 1M MODE SELECTION Disable PFM_nonultrasonic Sync VREF_OC R1+R2 8k start POR FBUVLO_latch Diode emulation HD VREF OCP_COMP Mini offtime 400ns PGND(7) 1.8V VIN TON(16) VOUT VREF_OC(10) ENSW /MODE(15) OVP VOUT 1.25*Vref/0.7VREF OCP_COMP FB AGND(PAD) FBUVLO_latch 0.7*Vref VOUT(1) VOUT DO(5) SCHIMTTER TRIGGER GPIO0(14) D1(4) SCHIMTTER TRIGGER GPIO1(6) start Figure 2 - Simplified block diagram of the NX2147 Rev. 1.6 Rev. 1.8 03/09/09 12/28/09 6 NX2147 TYPICAL APPLICATION (VIN=7V to 22V, VOUT=1.09V/12A) 5V R1 10 C1 1u C2 1u 9 2 PVCC TON VCC 16 C5 1n R6 499k VIN 7V~22V CI1 2x10uF M1 FDS6294 C6 1u Lo 1uH Vout (see table below) /12A CO1 2R5TPE330MC 330uF LOAD ENSW 15 /MODE 14 6 GPIO0 GPIO1 HDRV 12 R8 2.2 BST 13 SW 11 NX2147 10 VREF_OC R2 100k C3 0.1u C4 10n R3 88.7k 3 VP R4 200k 4 D1 R5 634k 5 D0 LDRV 8 M2 FDS6676AS R7 10 C7 470p PGND 7 VOUT AGND 6 1 VOUT TABLE: GPIO0 GPIO1 VOUT(V) 1 1 1.17 0 1 1.09 1 0 0.95 0 0 0.9 Figure 3 - Demo board schematic Rev. 1.6 Rev. 1.8 03/09/09 12/28/09 7 NX2147 Bill of Materials Item 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 Quantity 2 1 2 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Reference CI1 CO1 C1,C2 C3,C6 C4 C5 C7 Lo M1 M2 R1 R2 R3 R4 R5 R6 R7 R8 U1 Value 10uF/X5R/25V 2R5TPE330MC 1uF 0.1uF 10nF 1nF 470p RL-8250-1.4-1R0M FDS6294 FDS6676AS 10 100k 88.7k 200k 634k 499k 10 2.2 NX2147 Manufacture SANYO RENCO FAIRCHILD FAIRCHILD NEXSEM INC. Rev. 1.6 Rev. 1.8 03/09/09 12/28/09 8 NX2147 Demoboard waveforms Fig.4 Start up( CH1 VOUT 1V/DIV, CH4 Output current 5A/DIV) Fig.5 10A step response( CH1 VOUT AC 50mV/DIV, CH4 Output current 5A/DIV) Fig.6 Soft turn off(CH1 ENSW 2V/DIV, CH2 VOUT 0.5V/DIV) Fig.7 D0=0, D1 from low to high(CH1 D0 2V/DIV, CH2 VOUT 0.1V/DIV 0.8V OFFSET, CH3 INDUCTOR CURRENT 5A/DIV, CH4 VP 0.1V/DIV 0.8V OFFSET) OUTPUT EFFICIENCY (VIN=12V,VOUT=1.09V) OUTPUT EFFICIENCY (%) 95 90 85 80 75 70 65 60 55 50 10 100 1000 10000 Fig.8 D1=0, D0 from low to high(CH1 D0 2V/DIV, CH2 VOUT 0.1V/DIV 0.8V OFFSET, CH3 INDUCTOR CURRENT 5A/DIV, CH4 VP 0.1V/DIV 0.8V OFFSET) Rev. 1.6 Rev. 1.8 03/09/09 12/28/09 OUTPUT CURRENT (mA) Fig.9 Output efficiency 9 NX2147 MLPQ 16 PIN 3 x 3 PACKAGE OUTLINE DIMENSIONS SYMBOL NAME A A1 A3 B D D2 E E2 e L M Dimensions In Millimeters MIN 0.700 0.000 0.203REF 0.180 2.950 1.600 2.950 1.600 0.50BSC 0.325 1.5REF 0.450 0.300 3.050 1.750 3.050 1.750 MAX 0.800 0.050 Dimensions In Inches MIN 0.028 0.000 0.008REF 0.007 0.116 0.063 0.116 0.063 0.50BSC 0.013 0.059REF 0.018 0.012 0.120 0.069 0.120 0.069 MAX 0.031 0.002 Rev. 1.6 Rev. 1.8 03/09/09 12/28/09 10