NX2147 SINGLE CHANNEL MOBILE PWM CONTROLLER WITH DYNAMIC VOLTAGE ADJUSTMENT PRODUCTION DATA SHEET Pb Free Product FEATURES DESCRIPTION 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 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 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. 9 5V 1u PVCC TON 10 2 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 16 VIN 7V~22V 1n VCC 2x10uF 1u 14 6 ENSW /MODE GPIO0 GPIO1 10 VREF_OC NX2 1 4 7 15 HDRV 12 BST 13 88.7k 0.1u 200k 4 10n FDS6294 2.2 1u SW 11 LDRV 8 100k PGND 3 VP GPIO0 GPIO1 VOUT(V) 1 1 1.17 0 1 1.09 1 0 0.95 0 0 0.9 D1 VOUT 1uH FDS6676AS Vout (see table above) /12A 2R5TPE330MC 330uF LOAD 7 1 634k 5 D0 AGND 6 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 TON ENSW/MODE GPIO0 BST 3x3 16-LEAD PLASTIC MLPQ 16 15 14 13 θ JA ≈ 46o C/W 12 HDRV VOUT 1 11 SW VCC 2 VP 3 10 VREF_OC D1 4 9 PVCC 5 6 7 8 D0 GPIO1 PGND LDRV 17(PAD) AGND ELECTRICAL SPECIFICATIONS Unless otherwise specified, these specifications apply over Vcc =5V, VIN=15V and TA =25oC, unless otherwise specified. PARAMETER SYM Test Condition Min TYP MAX Units 24 V uA 5.5 V 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 4.5 ENSW=GND Vcc 1 4.5 No switching, ENSW=5V ENSW=GND 1.6 1 mA uA 2 NX2147 PARAMETER VCC UVLO Under-voltage Lockout threshold Falling VCC threshold ON and OFF time SYM Test Condition Min VIN=15V, Rton=1Mohm VIN=9V,VP=VOUT=0.75V,Rt on=499k ON -time Minimum off time VREF_OC voltage 380 VREF_OC voltage Line regulation OUTPUT voltage VCC from 4 to 5.5 Output range VOUT shut down discharge resistance 2.475 -2 Over temperature Threshold Hysteresis Rev. 1.6 Rev. 1.8 03/09/09 12/28/09 Units 4.1 3.9 V V 15 uA 390 590 2.5 0 ENSW/MODE=GND Soft start time GPIO threshold Low Side Driver (CL=3300pF) Output Impedance, Sourcing Current Output Impedance, Sinking Current Rise Time Fall Time Deadband Time MAX VCC _UVLO TON operating current 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 TYP 800 ns ns 2.525 2 V % 5.5 V 30 ohm 1.5 ms 2 0 5 0.8 V V 13 mohm 5 mV R source(Hdrv) I=200mA 1.5 ohm R sink (Hdrv) I=200mA 1.5 ohm THdrv(Rise) 10% to 90% THdrv(Fall) 90% to 10% Tdead(L to Ldrv going Low to Hdrv going H) High, 10% to 10% 50 50 30 ns ns ns R source(Ldrv) I=200mA 1.5 ohm Rsink(Ldrv) I=200mA 0.5 ohm 50 50 10 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 C C o 3 NX2147 PARAMETER ENSW/MODE threshold and bias current SYM Test Condition Ultrasonic Mode Input bias current Under voltage protection Under voltage trigger point Over voltage protection Over voltage tripp point Internal Schottky Diode Forward voltage drop Rev. 1.6 Rev. 1.8 03/09/09 12/28/09 TYP 80% VCC 60% VCC PFM/Non Synchronous Mode Synchronous Mode Shutdown mode Min Leave it open or use limits in spec MAX VCC+0 .3V 80% VCC 60% VCC 0.8 V V ENSW/MODE=VCC 1 V V uA ENSW/MODE=GND -1 uA 70 %VP 125 %VP 500 mV forward current=50mA 2 0 Units 4 NX2147 PIN DESCRIPTIONS PIN NUMBER PIN SYMBOL 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. 1 VOUT 2 VCC 3 VP This pin is connected via resistor divider to VREF_OC pin to set the output DC voltage from 0.5V to VREF 2.5V. 4 D1 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. 5 D0 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. 6 GPIO1 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. 7 PGND Power ground. 8 LDRV Low side gate driver output. 9 PVCC Provide the voltage supply to the lower MOSFET drivers. Place a high frequency decoupling capacitor 1uF X5R to this pin. 10 VREF_OC 11 SW 12 HDRV 13 BST 14 GPIO0 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. 15 ENSW/ MODE 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. 16 TON 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. 17 PAD Analog ground. Rev. 1.6 Rev. 1.8 03/09/09 12/28/09 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. 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. 5 NX2147 BLOCK DIAGRAM VCC(2) Bias Disable_B POR BST(13) Thermal shutdown TON(16) VIN 4.3/4.1 VIN start ON time pulse genearation VOUT ODB HD R S HDRV(12) FET Driver HD_IN Q SW(11) 1.8V 5V PVCC(9) VREF_OC(10) LDRV(8) VREF R1 Mini offtime 400ns OCP_COMP VP(3) PGND(7) R2 start POR FBUVLO_latch soft start ENSW /MODE(15) HD VCC 1M 1M Disable MODE SELECTION 8k PFM_nonultrasonic Sync VREF_OC R1+R2 VOUT 1.25*Vref/0.7VREF OCP_COMP OVP AGND(PAD) Diode emulation FB FBUVLO_latch 0.7*Vref VOUT(1) DO(5) VOUT SCHIMTTER TRIGGER start GPIO0(14) D1(4) SCHIMTTER TRIGGER GPIO1(6) 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) 9 5V R1 10 C1 1u PVCC TON 2 R6 499k 16 C5 1n VCC VIN 7V~22V CI1 2x10uF C2 1u M1 14 6 GPIO0 GPIO1 10 VREF_OC R2 100k C3 0.1u R3 88.7k C4 10n 3 VP R4 200k 4 D1 R5 634k 5 D0 NX2147 ENSW 15 /MODE HDRV 12 R8 2.2 BST 13 FDS6294 C6 1u SW 11 M2 LDRV 8 FDS6676AS Lo 1uH R7 10 C7 470p Vout (see table below) /12A CO1 2R5TPE330MC 330uF LOAD PGND 7 VOUT 1 AGND 6 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 Rev. 1.6 Rev. 1.8 03/09/09 12/28/09 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. 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 (%) OUTPUT EFFICIENCY (VIN=12V,VOUT=1.09V) 95 90 85 80 75 70 65 60 55 50 10 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 12/28/09 100 1000 10000 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 Rev. 1.6 Rev. 1.8 03/09/09 12/28/09 Dimensions In Millimeters MIN 0.700 0.000 MAX 0.800 0.050 Dimensions In Inches MIN 0.028 0.000 0.203REF 0.180 2.950 1.600 2.950 1.600 0.008REF 0.300 3.050 1.750 3.050 1.750 0.007 0.116 0.063 0.116 0.063 0.50BSC 0.325 0.012 0.120 0.069 0.120 0.069 0.50BSC 0.450 1.5REF MAX 0.031 0.002 0.013 0.018 0.059REF 10