LTM4606

LTM4606 Ultralow EMI 28VIN, 6A DC/DC µModule FEATURES n n n n n n n n n n n n n n n n n n DESCRIPTION The LTM®4606 is a complete ultralow noise high voltage 6A switching mode DC/DC power supply. Included in the package are the switching controller, power FETs, inductor, and all support components. The on-board input filter and noise cancellation circuits achieve low noise operation, thus effectively reducing the electromagnetic interference (EMI). Operating over an input voltage range of 4.5V to 28V, the LTM4606 supports an output voltage range of 0.6V to 5V, set by a single resistor. This high efficiency design delivers 6A continuous current (8A peak). Only bulk input and output capacitors are needed to finish the design. High switching frequency and an adaptive on-time current mode architecture enables a very fast transient response to line and load changes without sacrificing stability. The device supports output voltage tracking and output voltage margining. Furthermore, the μModule™ can be synchronized with an external clock for reducing undesirable frequency harmonics and allows PolyPhase® operation for high load currents. The LTM4606 is offered in a space saving and thermally enhanced 15mm × 15mm × 2.8mm LGA package, which enables utilization of unused space on the bottom of PC boards for high density point of load regulation. The LTM4606 is Pb-free and RoHS compliant. L, LT, LTC, LTM and PolyPhase are registered trademarks of Linear Technology Corporation. μModule is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Complete Low EMI Switch Mode Power Supply Wide Input Voltage Range: 4.5V to 28V 6A DC Typical, 8A Peak Output Current 0.6V to 5V Output Voltage Range Low Input and Output Referred Noise Output Voltage Tracking and Margining PLL Frequency Synchronization ±1.5% Total DC Error Power Good Output Current Foldback Protection (Disabled at Start-Up) Parallel/Current Sharing Ultrafast Transient Response Current Mode Control Up to 93% Efficiency at 5VIN , 3.3VOUT Programmable Soft-Start Output Overvoltage Protection –55°C to 125°C Operating Temperature Range (LTM4606MPV) Small Surface Mount Footprint, Low Profile Package (15mm × 15mm × 2.8mm) APPLICATIONS n n n n ASICs or FPGA Transceivers Telecom, Servers and Networking Equipment Industrial Equipment Rf Equipment TYPICAL APPLICATION Ultralow Noise 2.5V/6A Power Supply with 4.5V to 28V Input 4.5V TO 28V VIN PLLIN VOUT PGOOD RUN LTM4606 COMP INTVCC DRVCC fSET TRACK/SS VD SGND VFB FCB MARG0 MARG1 MPGM PGND CLOCK SYNC 2.5V AT 6A 47pF RFB 19.1k MARGIN CONTROL 392k 5% MARGIN 4606 TA01 Radiated Emission Scan at 12VIN, 2.5VOUT/6A 100 90 FIELD STRENGTH (dBμV/m) 80 70 60 50 40 30 20 10 0 0 100 200 300 400 500 600 700 800 900 1000 FREQUENCY (MHz) 4606 TA01b ON/OFF CIN 10μF 35V CERAMIC x2 COUT CISPR.22, CLASS B, 3 METERS TRACK/SS CONTROL 10μF 35V 4606f 1 LTM4606 ABSOLUTE MAXIMUM RATINGS (Note 1) PIN CONFIGURATION TOP VIEW fSET MARG0 MARG1 DRVCC VFB PGOOD SGND NC NC NC FCB MPGM COMP RUN TRACK/SS PLLIN INTVCC SGND VD 12 11 10 9 8 7 6 5 4 3 2 1 ABCDEFGHJKLM VIN PGND VOUT BANK 1 BANK 3 BANK 2 LGA PACKAGE 133-LEAD (15mm × 15mm × 2.8mm) TJMAX = 125°C, θJA = 15°C/W, θJC = 6°C/W θJA DERIVED FROM 95mm × 76mm PCB WITH 4 LAYERS WEIGHT = 1.7g DRVCC, VOUT ................................................ –0.3V to 6V PLLIN, FCB, TRACK/SS, MPGM, MARG0, MARG1, PGOOD, RUN ..........–0.3V to INTVCC + 0.3V VFB, fSET, COMP ........................................ –0.3V to 2.7V VIN, VD ....................................................... –0.3V to 28V Internal Operating Temperature Range (Note 2) E and I Grades ...................................–40°C to 125°C MP Grade...........................................–55°C to 125°C Junction Temperature ........................................... 125°C Storage Temperature Range...................–45°C to 125°C ORDER INFORMATION LEAD FREE FINISH LTM4606EV#PBF LTM4606IV#PBF LTM4606MPV#PBF TRAY LTM4606EV#PBF LTM4606IV#PBF LTM4606MPV#PBF PART MARKING* LTM4606V LTM4606V LTM4606MPV PACKAGE DESCRIPTION 133-Lead (15mm × 15mm × 2.8mm) LGA 133-Lead (15mm × 15mm × 2.8mm) LGA 133-Lead (15mm × 15mm × 2.8mm) LGA TEMPERATURE RANGE –40°C to 125°C –40°C to 125°C –55°C to 125°C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ This product is only offered in trays. For more information go to: http://linear.com/packaging/ The l denotes the specifications which apply over the full internal operating temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, unless otherwise noted. Per typical application (front page) configuration, RFB = 40.2k. SYMBOL VIN(DC) VOUT(DC) Input Specifications VIN(UVLO) IINRUSH(VIN) Undervoltage Lockout Threshold Input Inrush Current at Start-Up IOUT = 0A IOUT = 0A, CIN = 10μF x2, COUT = 200μF , VOUT = 1.5V VIN = 5V VIN = 12V 3.2 4 V PARAMETER Input DC Voltage Output Voltage, Total Variation with Line and Load CIN = 10μF x2, COUT = 200μF; FCB = 0 VIN = 5V to 28V, IOUT = 0A to 6A, (Note 4) CONDITIONS l l ELECTRICAL CHARACTERISTICS MIN 4.5 1.478 TYP 1.5 MAX 28 1.522 UNITS V V 0.6 0.7 A A 4606f 2 LTM4606 ELECTRICAL CHARACTERISTICS SYMBOL IQ(VIN) PARAMETER Input Supply Bias Current The l denotes the specifications which apply over the full internal operating temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, unless otherwise noted. Per typical application (front page) configuration, RFB = 40.2k. CONDITIONS VIN = 5V, No Switching VIN = 5V, VOUT = 1.5V, Switching Continuous VIN = 12V, No Switching VIN = 12V, VOUT = 1.5V, Switching Continuous Shutdown, RUN = 0, VIN = 12V VIN = 12V, VOUT = 1.5V, IOUT = 6A VIN = 5V, VOUT = 1.5V, IOUT = 6A INTVCC VIN = 12V, RUN > 2V Output Continuous Current Range Line Regulation Accuracy Load Regulation Accuracy Input Ripple Voltage No Load VIN = 12V, VOUT = 1.5V (Note 4) VOUT = 1.5V, FCB = 0V, VIN = 4.5V to 28V, IOUT = 0A VOUT = 1.5V, FCB = 0V, IOUT = 0A to 6A VIN = 12V (Note 4) IOUT = 0A, CIN = 10μF X5R Ceramic x3 and 100μF Electrolytic VIN = 5V, VOUT = 1.5V VIN = 12V, VOUT = 1.5V IOUT = 0A, COUT = 22μF X5R Ceramic x3 and 100μF X5R Ceramic VIN = 5V, VOUT = 1.5V VIN = 12V, VOUT = 1.5V IOUT = 5A, VIN = 12V, VOUT = 1.5V COUT = 200μF VOUT = 1.5V, IOUT = 0A , VIN = 12V VIN = 5V COUT = 200μF; VOUT = 1.5V, IOUT = 1A Resistive Load VIN = 5V VIN = 12V Load: 0% to 50% to 0% of Full Load COUT = 22μF Ceramic, 470μF x2 VIN = 12V VOUT = 1.5V l MIN TYP 1.5 27 2.5 25 22 0.96 2.18 MAX UNITS mA mA mA mA μA A A IS(VIN) Input Supply Current 4.7 0 5 5.3 6 V A % Output Specifications IOUT(DC) ΔVOUT(LINE)/VOUT ΔVOUT(LOAD)/VOUT VIN(AC) 0.05 0.3 l 0.3 % 2 3 mVP-P mVP-P VOUT(AC) Output Ripple Voltage 8 11 900 20 20 mVP-P mVP-P kHz mV mV fS ΔVOUT(START) Output Ripple Voltage Frequency Turn-On Overshoot, TRACK/SS = 10nF Turn-On Time, TRACK/SS = Open tSTART 0.5 0.5 35 ms ms mV ΔVOUT(LS) Peak Deviation for Dynamic Load tSETTLE IOUT(PK) Settling Time for Dynamic Load Step Load: 0% to 50% to 0% of Full Load, VIN = 12V VIN = 12V Output Current Limit COUT = 200μF VIN = 5V, VOUT = 1.5V VIN = 12V, VOUT = 1.5V IOUT = 0A, VOUT = 1.5V VSS/TRACK = 0V l 25 μs 10 10 0.594 1 –1 0.6 1.5 –1.5 0.606 1.9 –2 A A V V μA Control Section VFB VRUN ISS / TRACK Voltage at VFB Pin RUN Pin On/Off Threshold Soft-Start Charging Current 4606f 3 LTM4606 ELECTRICAL CHARACTERISTICS SYMBOL VFCB IFCB tON(MIN) tOFF(MIN) RPLLIN IDRVCC RFBHI RUNMAX Margin Section MPGM MARG0, MARG1 PGOOD ΔVFBH ΔVFBL ΔVFB(HYS) VPGL PGOOD Upper Threshold PGOOD Lower Threshold PGOOD Hysteresis PGOOD Low Voltage VFB Rising VFB Falling VFB Returning IPGOOD = 5mA 7 –7 10 –10 1.5 0.15 0.4 13 –13 % % % V Margin Reference Voltage Sets a Current Voltage Thresholds 1.18 1.4 V V PARAMETER Forced Continuous Threshold Forced Continuous Pin Current Minimum On Time Minimum Off Time PLLIN Input Resistor Current into DRVCC Pin Resistor Between VOUT and VFB Pins Volts From RUN to GND Maximum 5.1V Zener Clamp VOUT = 1.5V, IOUT = 1A 60.098 VFCB = 0V (Note 3) (Note 3) The l denotes the specifications which apply over the full internal operating temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, unless otherwise noted. Per typical application (front page) configuration, RFB = 40.2k. CONDITIONS MIN 0.57 TYP 0.6 –1 50 250 50 15 60.4 5 25 60.702 MAX 0.63 –2 100 400 UNITS V μA ns ns kΩ mA kΩ V Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The LTM4606E is guaranteed to meet performance specifications over the 0°C to 125°C internal operating temperature range. Specifications over the –40°C to 125°C internal operating temperature range are assured by design, characterization and correlation with statistical process controls. The LTM4606I is guaranteed to meet specifications over the –40°C to 125°C internal operating temperature range. The LTM4606MP is guaranteed and tested over the –55°C to 125°C internal operating temperature range. Note that the maximum ambient temperature is determined by specific operating conditions in conjunction with board layout, the rated package thermal resistance and other environmental factors. Note 3: 100% tested at die level only. Note 4: See output current derating curves for different VIN, VOUT and TA. 4606f 4 LTM4606 TYPICAL PERFORMANCE CHARACTERISTICS Efficiency vs Load Current with 5VIN (FCB = 0) 100 100 Efficiency vs Load Current with 12VIN (FCB = 0) 100 Efficiency vs Load Current with 24VIN (FCB = 0) 90 EFFICIENCY (%) EFFICIENCY (%) 90 EFFICIENCY (%) 1.2VOUT 1.5VOUT 2.5VOUT 3.3VOUT 5VOUT 0 1 2 3 4 LOAD CURRENT (A) 5 6 4606 G02 90 80 80 80 70 0.6VOUT 1.2VOUT 1.8VOUT 2.5VOUT 3.3VOUT 0 1 2 3 4 LOAD CURRENT (A) 5 6 4606 G01 70 70 60 60 60 50 50 50 2.5VOUT 3.3VOUT 5VOUT 0 1 2 3 4 LOAD CURRENT (A) 5 6 4606 G03 1.2V Transient Response 1.5V Transient Response 1.8V Transient Response IOUT 2A/DIV VOUT 50mV/DIV 4606 G04 IOUT 2A/DIV VOUT 50mV/DIV 4606 G05 IOUT 2A/DIV VOUT 50mV/DIV 4606 G06 50μs/DIV 1.2V AT 3.5A/μs LOAD STEP COUT = 2x 22μF 10V CERAMIC , 1x 100μF 6.3V CERAMIC , 50μs/DIV 1.5V AT 3.5A/μs LOAD STEP COUT = 2x 22μF 10V CERAMIC , 1x 100μF 6.3V CERAMIC , 50μs/DIV 1.8V AT 3.5A/μs LOAD STEP COUT = 2x 22μF 10V CERAMIC , 1x 100μF 6.3V CERAMIC , 2.5V Transient Response 3.3V Transient Response VOUT 0.5V/DIV –55°C, Start-Up, IOUT = 0A IOUT 2A/DIV VOUT 50mV/DIV 4606 G07 IOUT 2A/DIV VOUT 100mV/DIV 4606 G08 IIN 0.5A/DIV 50μs/DIV 3.3V AT 3.5A/μs LOAD STEP COUT = 2x 22μF 10V CERAMIC , 1x 100μF 6.3V CERAMIC , 1ms/DIV VIN = 12V VOUT = 1.5V , COUT = 2x 22μF 10V CERAMIC 1x 100μF 6.3V CERAMIC , SOFT-START = 3.9nF 4606 G16 50μs/DIV 2.5V AT 3.5A/μs LOAD STEP COUT = 2x 22μF 10V CERAMIC , 1x 100μF 6.3V CERAMIC , 4606f 5 LTM4606 TYPICAL PERFORMANCE CHARACTERISTICS –55°C, Start-Up, IOUT = 6A VOUT 0.5V/DIV Start-Up, IOUT = 0A Start-Up, IOUT = 6A (Resistive Load) VOUT 0.5V/DIV VOUT 0.5V/DIV IIN 0.5A/DIV 1ms/DIV VIN = 12V VOUT = 1.5V , COUT = 2x 22μF 10V CERAMIC 1x 100μF 6.3V CERAMIC , SOFT-START = 3.9nF 4606 G17 IIN 0.5A/DIV 1ms/DIV VIN = 12V VOUT = 1.5V , COUT = 1x 22μF 6.3V CERAMIC 1x 330μF 4V SANYO POSCAP , SOFT-START = 3.9nF 4606 G09 IIN 0.5A/DIV 1ms/DIV VIN = 12V VOUT = 1.5V , COUT = 1x 22μF 6.3V CERAMIC 1x 330μF 4V SANYO POSCAP , SOFT-START = 3.9nF 4606 G10 Short-Circuit Protection, IOUT = 0A Short-Circuit Protection, IOUT = 6A 28 24 VIN to VOUT Step-Down Operation Region SEE FREQUENCY ADJUSTMENT SECTION FOR OPERATIONS OUTSIDE THIS REGION VOUT 2V/DIV IIN 0.2A/DIV VOUT 1V/DIV 20 VIN (V) IIN 2A/DIV 16 12 8 4.5 0.6 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 VOUT (V) 4606 G13 OPERATION REGION WITH DEFAULT FREQUENCY 50μs/DIV VIN = 12V VOUT = 2.5V , COUT = 2x 22μF 10V CERAMIC 1x 100μF 6.3V CERAMIC , SOFT-START = 0.1μF 4606 G11 50μs/DIV VIN = 12V VOUT = 2.5V , COUT = 2x 22μF 10V CERAMIC 1x 100μF 6.3V CERAMIC , SOFT-START = 0.1μF 4606 G12 VFB vs Temperature 0.606 0.604 0.602 VFB (V) 0.600 0.598 0.596 0.594 –55 VIN 10mV/DIV Input Ripple Output Ripple VOUT 2mV/DIV 2μs/DIV VIN = 5V VOUT = 1V AT 6A , CIN = 3x 10μF 25V CERAMIC 1x 150μF BULK BW = 300MHz –25 35 65 5 TEMPERATURE (°C) 95 125 4606 G18 4606 G14 2μs/DIV VIN = 5V VOUT = 1V AT 6A , COUT = 2x 22μF 6.3V CERAMIC 1x 100μF 6.3V CERAMIC , BW = 300MHz 4606 G15 4606f 6 LTM4606 PIN FUNCTIONS VIN (Bank 1): Power Input Pins. Apply input voltage between these pins and PGND pins. Recommend placing input decoupling capacitance directly between VIN pins and PGND pins. VOUT (Bank 3): Power Output Pins. Apply output load between these pins and PGND pins. Recommend placing output decoupling capacitance directly between these pins and PGND pins (see figure below). PGND (Bank 2): Power Ground Pins for Both Input and Output Returns. VD (Pins B7, C7): Top FET Drain Pins. Add more capacitors between VD and ground to handle the input RMS current and reduce the input ripple further. DRVCC (Pins C10, E11, E12): These pins normally connect to INTVCC for powering the internal MOSFET drivers. They can be biased up to 6V from an external supply with about 50mA capability, or an external circuit as shown in Figure 18. This improves efficiency at the higher input voltages by reducing power dissipation in the modules. INTVCC (Pin A7): This pin is for additional decoupling of the 5V internal regulator. PLLIN (Pin A8): External Clock Synchronization Input to the Phase Detector. This pin is internally terminated to SGND with a 50k resistor. Apply a clock above 2V and below INTVCC. See the Applications Information section. FCB (Pin M12): Forced Continuous Input. Connect this pin to SGND to force continuous synchronization operation at TOP VIEW fSET MARG0 MARG1 DRVCC VFB PGOOD SGND NC NC NC FCB low load, to INTVCC to enable discontinuous mode operation at low load or to a resistive divider from a secondary output when using a secondary winding. TRACK/SS (Pin A9): Output Voltage Tracking and Soft-Start Pin. When the module is configured as a master output, then a soft-start capacitor is placed on this pin to ground to control the master ramp rate. A soft-start capacitor can be used for soft-start turn-on as a standalone regulator. Slave operation is performed by putting a resistor divider from the master output to ground, and connecting the center point of the divider to this pin. See the Applications Information section. MPGM (Pins A12, B11): Programmable Margining Input. A resistor from these pins to ground sets a current that is equal to 1.18V/R. This current multiplied by 10kΩ will equal a value in millivolts that is a percentage of the 0.6V reference voltage. See the Applications Information section. To parallel LTM4606s, each requires an individual MPGM resistor. Do not tie MPGM pins together. fSET (Pin B12): Frequency set internally to 800kHz. An external resistor can be placed from this pin to ground to increase frequency. This pin can be decoupled with a 1000pF capacitor. See the Applications Information section for frequency adjustment. VFB (Pin F12): The Negative Input of the Error Amplifier. Internally, this pin is connected to VOUT with a 60.4k precision resistor. Different output voltages can be programmed with an additional resistor between the VFB and SGND pins. See the Applications Information section. MARG0 (Pin C12): LSB Logic Input for the Margining Function. Together with the MARG1 pin, the MARG0 pin will determine if a margin high, margin low, or no margin state is applied. The pin has an internal pulldown resistor of 50k. See the Applications Information section. MARG1 (Pins C11, D12): MSB Logic Input for the Margining Function. Together with the MARG0 pin, the MARG1 pins will determine if a margin high, margin low, or no margin state is applied. The pins have an internal pulldown resistor of 50k. See the Applications Information section. SGND (Pins D9, H12): Signal Ground Pins. These pins connect to PGND at output capacitor point. 4606f MPGM COMP RUN TRACK/SS PLLIN INTVCC SGND VD 12 11 10 9 8 7 6 5 4 3 2 1 ABCDEFGHJKLM VIN PGND VOUT BANK 1 BANK 3 BANK 2 7 LTM4606 PIN FUNCTIONS COMP (Pins A11, D11): Current Control Threshold and Error Amplifier Compensation Point. The current comparator threshold increases with this control voltage. The voltage ranges from 0V to 2.4V with 0.7V corresponding to zero sense voltage (zero current). PGOOD (Pin G12): Output Voltage Power Good Indicator. Open-drain logic output that is pulled to ground when the output voltage is not within ±10% of the regulation point, after a 25μs power bad mask timer expires. RUN (Pins A10, B9): Run Control Pins. A voltage above 1.9V will turn on the module, and below 1V will turn off the module. A programmable UVLO function can be accomplished with a resistor from VIN to this pin that has a 5.1V zener to ground. Maximum pin voltage is 5V. BLOCK DIAGRAM >1.9V = ON