NX9548ILQ-TR

NX9548 7A SINGLE CHANNEL MOBILE PWM SWITCHING REGULATOR TARGET SPECIFICATION Pb Free Product FEATURES DESCRIPTION The NX9548 is buck switching converter in multi chip Internal Boost Schottky Diode module designed for step down DC to DC converter in Ultrasonic mode operation available portable applications. It is optimized to convert single  Bus voltage operation from 4.5V to 20V supply up to 20V bus voltage to as low as 0.75V outputLess than 1uA shutdown current with Enable low voltage.The output current can be up to 7A. It can be  Excellent dynamic response with constant on time control selected to operate in synchronous mode or non-synchronous mode to improve the efficiency at light load. Selectable between Synchronous CCM mode and diode emulation mode to improve efficiency at light Constant on time control provides fast response, good load line regulation and nearly constant frequency under wide voltage input range. Over current protection and FB UVLOProgrammable switching frequency followed by latch feature. Other features includes: inter- Current limit and FB UVLO with latch off nal boost schottky diode, 5V gate drive capability , power  Over voltage protection with latch off good indicator, over current protection, over voltage protection and adaptive dead band control.NX9548 is avail- UMPC, Notebook PCs and Desknotes able in 5x5 MCM package.  Tablet PCs/Slates APPLICATIONS   PGOOD PGOOD On board DC to DC such as 12V to 3.3V, 2.5V or 1.8V Hand-held portable instruments TYPICAL APPLICATION TON 1M 1n 100k VIN 8V~20V D1 2x10uF PVCC 5V 1u VCC 1u ENSW /MODE NX 9 5 48 10 HG BST 1u 3.3uH S1 D2 Vout 1.5V/7A 2R5TPE330MC 330uF 10k OCP VOUT 330p FB HDRV GND 4.7 7.5k 7.5k S2 Figure 1 - Typical application of 9548 ORDERING INFORMATION Device NX9548CMTR Rev.0.1 03/06/12 Temperature 0 to 70oC Package 5X5 MCM-32L Pb-Free Yes 1 NX9548 ABSOLUTE MAXIMUM RATINGS VCC,PVCC to GND & BST to SW voltage ........... -0.3V to 6.5V TON to GND ................................................. .... -0.3V to 28V HDRV to SW Voltage ....................................... -0.3V to 6.5V D1 to S1and D2 to S2 ........................................ 30V All other pins .................................................... -0.3V to VCC+0.3V or 6.5V Storage Temperature Range ............................... -65oC to 150oC Operating Junction Temperature Range ............... -40oC to 125oC ESD Susceptibility ........................................... 2kV Power Dissipation ............................................. Internally Limited by OTP CAUTION: Stresses above those listed in "ABSOLUTE MAXIMUM RA TINGS", 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 VCC FB PGOOD GND HG D1 D1 D1 32-LEAD PLASTIC MCM 5 x 5 32 31 30 29 28 27 26 25 24 TON S1 1 S1 2 S1 3 D1 4 21 GND D2 5 20 BST D2 6 D2 7 D2 8 D1 (PAD2) 22 ENSW/MODE 19 D2 D2 (PAD3) 18 HDRV 17 NC OCP PVCC S2 S2 S2 S2 10 11 12 13 14 15 16 S2 S2 9 Rev.0.1 03/06/12 23 VOUT GND (PAD1) 2 NX9548 ELECTRICAL SPECIFICATIONS Unless otherwise specified, these specifications apply over Vcc = 5V , VIN = 12V andTA= 0 to 70oC. Typical values o refer to TA = 25 C. Low duty cycle pulse testing is used which keep s junction and case temperatures equal to the ambient temperature. PARAMETER SYM Te st Condition Min TYP MAX Units 20 V VIN recommended voltage range 4.5 Shut down current VCC,PVCC Supply Input voltage range ENSW = GND V in 4.5 Operating quies cent c urrent FB=0.85V, ENSW =5V Shut down current VCC UV LO Under-voltage Loc kout threshold Falling V CC threshold ON a nd OFF tim e TON operating c urrent ENSW = GND ON -time Minimum off time FB volta ge Internal FB voltage Input bias c urrent Line regulation OUTPUT volta ge Output range VOUT s hut down discharge resistance Soft start time PGOOD PGOOD high rising threshold PGOOD delay after s oftstart PGOOD propagation delay filter PGOOD hy steresis PGOOD output s witch impedance PGOOD leakage current ENSW /MODE th re shold a nd bia s curre nt V C C _UVLO V VIN= 15V, Rton= 1Mohm = IN 9V,VOUT = 0.75V,Rton =1Mohm Vref VCC from 4.5V to 5.5V Synchronous M ode Shutdown m ode Input bias c urrent Rev.0.1 03/06/12 5.5 1.8 4.1 3.9 V 4.5 4.3 A V V uA 312 380 390 590 468 800 ns ns 0.739 0.75 200 0.761 1 V nA % 5 V -1 ENSW /MODE=GND NOTE1 NOTE1 13 ENSW /MODE = VCC ENSW /MODE = GND u 15 0.75 Leave it open or use limits in s pec uA mA 1 3.9 3.7 PFM/Non S ynchronous M ode Ultrasonic M ode 1 30 1.5 ohm ms 90 1.6 % V ref ms 2 5 us % 1 ohm uA 80% VCC 60% VCC 2 0 - 5 5 VCC+ 0.3V 80% VCC 60% VCC 0.8 u V V V V A uA 3 NX9548 PARAMETER SYM Te st Condition Min TYP MAX Units SW ze ro cross com pa ra tor Offset voltage Curre nt Lim it Ocset s etting c urrent Ove r te m pe ra ture Threshold 5 20 N OTE1 Hysteresis Unde r volta ge FB threshold Ove r volta ge Over voltage tripp point Inte rna l S chottky Diode Forward voltage drop Ouput Sta ge High S ide M OSFET RD SON Low S ide MOSFET R D SON Output Current forward c urrent= 50mA 24 mV 28 uA 155 o C 15 o C 70 % Vref 125 % Vref 500 mV 23 20 7 mohm mohm A NOTE1: This parameter is guaranteed by design but not tested in production(GBNT). Rev.0.1 03/06/12 4 NX9548 PIN DESCRIPTIONS PIN # 1-3 PIN SYMBOL PIN DESCRIPTION S1 Source of high side MOSFET.These pins must be connected directly to the drain of low side MOSFET via a plane connection. 4,30-32 PAD2 D1 Drain of high side MOSFET. 5-8,19, PAD3 D2 Drain of low side MOSFET and the controller pin out SW. 9-14 S2 Source of low side MOSFET and need to be directly connected to power ground via multiple vias. 15 PVCC This pin provides the voltage supply to the lower MOSFET drivers. Place a high frequency decoupling capacitor 1uF X5R from this pin to GND. 16 OCP This pin is connected to the drain of the external low side MOSFET via resistor and is the input of the over current protection(OCP) comparator. An internal current source is flown from this pin to the external resistor which sets the OCP voltage across the Rdson of the low side MOSFET. Current limit point is this voltage divided by the Rdson. Once this threshold is reached the chip is latched out. 17 NC 18 HDRV 20 BST 22 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. 23 VOUT This pin is directly connected to the output of the switching regulator and senses the VOUT voltage. An internal MOSFET discharges the output during turn off. 24 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. 25 VCC 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. 26 FB 27 PGOOD 21,28 PAD1 GND 29 HG Rev.0.1 03/06/12 Not used. High side gate driver output which needs to be connected to high side MOSFET gate HG pin. A small value resistor may be placed between two pins to slow down the high side MOSFET, reducing the ringing on SW nodes. This pin supplies voltage to high side FET driver. A minimum high freq 0.47uF ceramic capacitor is placed as close as possible to and connected to this pin and respected pin 19.A 4.7ohm resister is recommended in series with this capacitor. This pin is the error amplifiers inverting input. This pin is connected via resistor divider to the output of the switching regulator to set the output DC voltage from 0.75V to 3.3V. PGOOD indicator for switching regulator. It requires a pull up resistor to Vcc or lower voltage. When FB pin reaches 90% of the reference voltage PGOOD transitions from LO to HI state. Ground pin. High side MOSFET gate. 5 NX9548 BLOCK DIAGRAM BST HDRV HG D1 VCC Bias TON 4.3/4.1 ON time pulse genearation VOUT Disable_B Thermal shutdown POR start ODB HD R S FET Driver HD_IN Q S1 D2 FB Mini offtime 400ns OCP_COMP S2 VREF=0.75V start POR FBUVLO_latch soft start Diode emulation HD PVCC VCC ENSW /MODE 1M 1M Disable MODE SELECTION PFM_nonultrasonic Sync OCP FB 1.25*Vref/0.7VREF OCP_COMP OVP GND FB FBUVLO_latch PGOOD 0.7*Vref SS_finished VOUT VOUT start 0.9*Vref Figure 2 - Simplified block diagram of the NX9548 Rev.0.1 03/06/12 6 NX9548 Demoboard design and waveforms sdfd 27 PGOOD PGOOD TON R6 10k 15 5V C6 1u C7 1u PVCC 25 VCC ENSW 22 /MODE 29 18 HG HDRV NX9548 R5 10 D1 BST 24 R1 1M C3 1n 4,30-32,PAD2 C1 2 x 4.7uF,25V,X5R 20 S1 1-3 5-8,19,PAD3 D2 VOUT C2 10uF,25V,X5R R6 4.7 C4 1u OCP 16 VIN 8V~20V DO5010H-332MLD L1 3.3uH Vout 1.5V/7A 2R5TPE330MC C5 330uF R2 10k 23 FB 26 C8 330p GND S2 9-14 21,28,PAD1 R3 7.5k R4 7.5k Figure 3 - Demoboard schematic of NX9548 Rev.0.1 03/06/12 7 NX9548 Bill of Materials Item 1 2 3 4 5 6 7 8 9 10 11 12 13 Rev.0.1 03/06/12 Quantity 2 1 1 3 1 1 1 2 2 1 1 1 1 Reference C1 C2 C3 C4,C6,C7 C5 C8 R1 R2,R6 R3,R4 R5 R6 L1 U1 Part 4.7uF,25V,X5R 10uF,25V,X5R 1nF,50V,X7R 1uF,10V,X7R 2R5TPE330MC 330pF 1MEG 10k 7.5k 10 4.7 DO5010H-332MLD NX9548 Manufacturer SANYO COILCRAFT MICROSEMI 8 NX9548 Demoboard Waveforms Fig.4 Startup when 5V is present and 12V bus is started up, output load current is at 1.5A. Fig.6 Shutdown when 12V bus is present and 5V is shuted down. Fig.8 5A step response(VIN=5V) Rev.0.1 03/06/12 Fig.5 Startup when 12V bus is present and 5V is started up. Fig.7Output ripple (VIN=15V IOUT=1.2A) Fig.9 5A step response(VIN=20V) 9 NX9548 NX9548 Efficiency NX9548 Efficiency  @ 12V VIN, 600kHz 100.00% 95.00% 90.00% 85.00% VOUT=1.0V VOUT=1.2V VOUT=1.5V VOUT=1.8V 80.00% VOUT=3.3V VOUT=5.0V 75.00% 70.00% 65.00% 50 1050 2050 3050 4050 5050 6050 7050 Load Current (mA) Fig.11 Output efficiency at different output voltage Fig. 11 efficiency data uses the same schematic as Fig.3, except for R1 is adjusted to have 600kHz working frequency and inductor values specified in table below. VOUT 1V, 1.2V, 1.5V 1.8V 3.3V Rev.0.1 03/06/12 INDUCTOR Coilcraft DO5010P‐152HC, 1.5uH Coilcraft DO5010P‐222HC, 2.2uH Coilcraft DO5010P‐332HC, 3.3uH 11 NX9548 APPLICATION INFORMATION Symbol Used In Application Information: VIN - Input voltage VOUT - Output voltage IOUT - Output current Output Inductor Selection The value of inductor is decided by inductor ripple current and working frequency. Larger inductor value normally means smaller ripple current. However if the in- DVRIPPLE - Output voltage ripple FS is around 220kHz. ductance is chosen too large, it brings slow response - Working frequency and lower efficiency. The ripple current is a design free- DIRIPPLE - Inductor current ripple dom which can be decided by design engineer according to various application requirements. The inductor value Design Example The following is typical application for NX9548, the schematic is figure 1. can be calculated by using the following equations: LOUT = VIN = 8 to 22V ( VIN -VOUT ON) × T IRIPPLE ...(3) IRIPPLE =k × IOUTPUT VOUT=1.5V FS=220kHz where k is percentage of output current. In this example, inductor from COILCRAFT DO5010H-332 with L=3.3uH is chosen. IOUT=7A DVRIPPLE