LTM4601AEV-1-PBF

FEATURES n n n n n n n n n n n n n n n n n n LTM4601A/LTM4601A-1 12A DC/DC µModules with PLL, Output Tracking and Margining DESCRIPTION The LTM®4601A is a complete 12A step-down switch mode DC/DC power supply with onboard switching controller, MOSFETs, inductor and all support components. The μModule™ is housed in a small surface mount 15mm × 15mm × 2.8mm LGA package. The LTM4601A LGA package is designed with redundant mounting pads to enhance solder-joint strength for extended temperature cycling endurance. Operating over an input voltage range of 4.5 to 20V, the LTM4601A supports an output voltage range of 0.6V to 5V as well as output voltage tracking and margining. The high efficiency design delivers 12A continuous current (14A peak). Only bulk input and output capacitors are needed to complete the design. The low profile (2.8mm) and light weight (1.7g) package easily mounts on the back side of PC boards. The μModule can be synchronized with an external clock for reducing undesirable frequency harmonics and allows PolyPhase® operation for high load currents. An onboard differential remote sense amplifier can be used to accurately regulate an output voltage independent of load current. The onboard remote sense amplifier is not available in the LTM4601A-1. L, LT, LTC, LTM and PolyPhase are registered trademarks of Linear Technology Corporation. μModule and UltraFast are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 5481178, 5847554, 6304066, 6476589, 6580258, 6677210, 6774611. Complete Switch Mode Power Supply Wide Input Voltage Range: 4.5V to 20V 12A DC Typical, 14A Peak Output Current 0.6V to 5V Output Voltage Output Voltage Tracking and Margining Redundant Mounting Pads for Enhanced SolderJoint Strength Parallel Multiple μModules for Current Sharing Differential Remote Sensing for Precision Regulation (LTM4601A Only) PLL Frequency Synchronization ±1.5% Total DC Error Current Foldback Protection (Disabled at Start-Up) Pb-Free (e4) RoHS Compliant Package with Gold Finish Pads UltraFast™ Transient Response Current Mode Control Up to 95% Efficiency at 5VIN, 3.3VOUT Programmable Soft-Start Output Overvoltage Protection Enhanced (15mm × 15mm × 2.8mm) Surface Mount LGA Package APPLICATIONS n n Telecom and Networking Equipment Servers TYPICAL APPLICATION 1.5V/12A Power Supply with 4.5V to 20V Input VIN 4.5V TO 20V VIN PGOOD ON/OFF CIN RUN COMP INTVCC DRVCC MPGM SGND PLLIN TRACK/SS VOUT VFB MARG0 MARG1 VOUT_LCL DIFFVOUT VOSNS+ VOSNS– fSET RSET 40.2k 4601A TA01a Efficiency and Power Loss vs Load Current 95 EFFICIENCY 90 VOUT 1.5V 12A 85 EFFICIENCY (%) 80 75 70 65 60 POWER LOSS 55 50 0 2 4 6 8 10 LOAD CURRENT (A) 12 14 1.0 0.5 12VIN 5VIN 2.0 1.5 5VIN 3.5 12VIN 3.0 2.5 4.0 CLOCK SYNC TRACK/SS CONTROL POWER LOSS (W) 100pF MARGIN CONTROL LTM4601A COUT R1 392k 5% MARGIN PGND 4601A TA01b 4601afb 1 LTM4601A/LTM4601A-1 ABSOLUTE MAXIMUM RATINGS (Note 1) PIN CONFIGURATION (See Table 5. Pin Assignment) TOP VIEW INTVCC PLLIN TRACK/SS RUN COMP MPGM MTP1 INTVCC PGND MTP2 MTP3 fSET MARG0 MARG1 DRVCC VFB PGOOD SGND VOSNS+/NC2* DIFFVOUT/NC3* VOUT_LCL VOSNS–/NC1* INTVCC, DRVCC, VOUT_LCL, VOUT (VOUT ≤ 3.3V with DIFFVOUT)..................................................... –0.3V to 6V PLLIN, TRACK/SS, MPGM, MARG0, MARG1, PGOOD, fSET ..............................–0.3V to INTVCC + 0.3V RUN ............................................................. –0.3V to 5V VFB, COMP ................................................ –0.3V to 2.7V VIN ............................................................. –0.3V to 20V VOSNS+, VOSNS– ..........................–0.3V to INTVCC + 0.3V Operating Temperature Range (Note 2).... –40°C to 85°C Junction Temperature ........................................... 125°C Storage Temperature Range...................–55°C to 125°C VIN VOUT 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 *LTM4601A-1 ONLY ORDER INFORMATION LEAD FREE FINISH LTM4601AEV#PBF LTM4601AIV#PBF LTM4601AEV-1#PBF LTM4601AIV-1#PBF TRAY LTM4601AEV#PBF LTM4601AIV#PBF LTM4601AEV-1#PBF LTM4601AIV-1#PBF PART MARKING* LTM4601AV LTM4601AV LTM4601AV-1 LTM4601AV-1 PACKAGE DESCRIPTION 133-Lead (15mm × 15mm × 2.8mm) LGA 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 85°C –40°C to 85°C –40°C to 85°C –40°C to 85°C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. 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://www.linear.com/packaging/ The l denotes the specifications which apply over the –40°C to 85°C temperature range, otherwise specifications are at TA = 25°C, VIN = 12V. Per typical application (front page) configuration. SYMBOL VIN(DC) VOUT(DC) PARAMETER Input DC Voltage Output Voltage, Total Variation with Line and Load Undervoltage Lockout Threshold Input Inrush Current at Startup CIN = 10μF ×3, COUT = 200μF, RSET = 40.2k VIN = 5V to 20V, IOUT = 0A to 12A (Note 5) IOUT = 0A IOUT = 0A. VOUT = 1.5V VIN = 5V VIN = 12V CONDITIONS l l ELECTRICAL CHARACTERISTICS MIN 4.5 1.478 TYP MAX 20 UNITS V V V A A 1.5 3.2 0.6 0.7 1.522 4 Input Specifications VIN(UVLO) IINRUSH(VIN) 4601afb 2 LTM4601A/LTM4601A-1 ELECTRICAL CHARACTERISTICS SYMBOL IQ(VIN,NOLOAD) PARAMETER Input Supply Bias Current The l denotes the specifications which apply over the – 40°C to 85°C temperature range, otherwise specifications are at TA = 25°C, VIN = 12V. Per typical application (front page) configuration. CONDITIONS VIN = 12V, No Switching VIN = 12V, VOUT = 1.5V, Switching Continuous VIN = 5V, No Switching VIN = 5V, VOUT = 1.5V, Switching Continuous Shutdown, RUN = 0, VIN = 12V VIN = 12V, VOUT = 1.5V, IOUT = 12A VIN = 12V, VOUT = 3.3V, IOUT = 12A VIN = 5V, VOUT = 1.5V, IOUT = 12A No Load VIN = 12V, VOUT = 1.5V (Note 5) VOUT = 1.5V, IOUT = 0A, VIN from 4.5V to 20V VOUT = 1.5V, 0A to 12A (Note 5) VIN = 12V, with Remote Sense Amplifier VIN = 12V (LTM4601A-1) IOUT = 0A, COUT = 2×, 100μF X5R Ceramic VIN = 12V, VOUT = 1.5V VIN = 5V, 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 Resisitive Load VIN = 12V VIN = 5V Load: 0% to 50% to 0% of Full Load, COUT = 2 × 22μF Ceramic, 470μF 4V Sanyo POSCAP VIN = 12V VIN = 5V l MIN TYP 3.8 38 2.5 42 22 1.81 3.63 4.29 MAX UNITS mA mA mA mA μA A A A IS(VIN) Input Supply Current INTVCC IOUTDC ΔVOUT(LINE) VOUT ΔVOUT(LOAD) VOUT VOUT(AC) VIN = 12V, RUN > 2V Output Continuous Current Range Line Regulation Accuracy Load Regulation Accuracy 4.7 0 5 5.3 12 0.3 V A % Output Specifications l l 0.25 1 20 18 850 20 20 % % mVP-P mVP-P kHz mV mV Output Ripple Voltage fS ΔVOUT(START) Output Ripple Voltage Frequency Turn-On Overshoot, TRACK/SS = 10nF Turn-On Time, TRACK/SS = Open tSTART 0.5 0.5 ms ms ΔVOUTLS Peak Deviation for Dynamic Load 35 35 25 17 17 0 0 1 3 INTVCC – 1 INTVCC 1.25 mV mV μs A A V V mV V/V MHz tSETTLE IOUTPK Settling Time for Dynamic Load Step Load: 0% to 50%, or 50% to 0% of Full Load VIN = 12V Output Current Limit COUT = 200μF, Table 2 VIN = 12V, VOUT = 1.5V VIN = 5V, VOUT = 1.5V Remote Sense Amp (Note 3) (LTM4601A Only, Not Supported in the LTM4601A-1) VOSNS+, VOSNS– CM Range DIFFVOUT Range VOS AV GBP Common Mode Input Voltage Range VIN = 12V, RUN > 2V Output Voltage Range Input Offset Voltage Magnitude Differential Gain Gain-Bandwidth Product VIN = 12V, DIFF OUT Load = 100k 4601afb 3 LTM4601A/LTM4601A-1 ELECTRICAL CHARACTERISTICS SYMBOL SR RIN CMRR Control Stage VFB VRUN ISS/TRACK tON(MIN) tOFF(MIN) RPLLIN IDRVCC RFBHI VMPGM VMARG0 , VMARG1 PGOOD Output 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 Error Amplifier Input Voltage Accuracy RUN Pin On/Off Threshold Soft-Start Charging Current Minimum On-Time Minimum Off-Time PLLIN Input Resistance Current into DRVCC Pin Resistor Between VOUT_LCL and VFB Margin Reference Voltage MARG0, MARG1 Voltage Thresholds VOUT = 1.5V, IOUT = 1A, DRVCC = 5V 60.098 VSS/TRACK = 0V (Note 4) (Note 4) IOUT = 0A, VOUT = 1.5V l The l denotes the specifications which apply over the –40°C to 85°C temperature range, otherwise specifications are at TA = 25°C, VIN = 12V. Per typical application (front page) configuration. PARAMETER Slew Rate Input Resistance Common Mode Rejection Mode 0.594 1 –1 VOSNS+ to GND CONDITIONS MIN TYP 2 20 100 0.6 1.5 –1.5 50 250 50 18 60.4 1.18 1.4 25 60.702 0.606 1.9 –2 100 400 MAX UNITS V/μs kΩ dB V V μA ns ns kΩ mA kΩ V 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 LTM4601AE/LTM4601AE-1 are guaranteed to meet performance specifications from 0°C to 85°C. Specifications over the –40°C to 85°C operating temperature range are assured by design, characterization and correlation with statistical process controls. The LTM4601AI/LTM4601AI-1 are guaranteed and tested over the –40°C to 85°C temperature range. Note 3: Remote sense amplifier recommended for ≤3.3V output. Note 4: 100% tested at wafer level only. Note 5: See Output Current Derating curves for different VIN , VOUT and TA. 4601afb 4 LTM4601A/LTM4601A-1 TYPICAL PERFORMANCE CHARACTERISTICS Efficiency vs Load Current with 5VIN 100 95 90 EFFICIENCY (%) EFFICIENCY (%) 85 80 75 70 65 60 55 50 0 5 10 0.6VOUT 1.2VOUT 1.5VOUT 2.5VOUT 3.3VOUT 15 4601A G01 (See Figure 18 for all curves) Efficiency vs Load Current with 20VIN 100 95 90 EFFICIENCY (%) 85 80 75 70 65 60 55 15 4601A G02 Efficiency vs Load Current with 12VIN 100 95 90 85 80 75 70 65 60 55 50 0 0.6VOUT 1.2VOUT 1.5VOUT 2.5VOUT 3.3VOUT 5VOUT 10 5 LOAD CURRENT (A) 50 0 1.2VOUT 1.5VOUT 2.5VOUT 3.3VOUT 5.0VOUT 10 5 LOAD CURRENT (A) 15 4601A G03 LOAD CURRENT (A) 1.2V Transient Response VOUT 50mV/DIV IOUT 5A/DIV VOUT 50mV/DIV 1.5V Transient Response VOUT 50mV/DIV 1.8V Transient Response IOUT 5A/DIV IOUT 5A/DIV 20μs/DIV 1.2V AT 6A/μs LOAD STEP COUT = 3 • 22μF 6.3V CERAMICS 470μF 4V SANYO POSCAP C3 = 100pF 4601A G04 20μs/DIV 1.5V AT 6A/μs LOAD STEP COUT = 3 • 22μF 6.3V CERAMICS 470μF 4V SANYO POSCAP C3 = 100pF 4601A G05 20μs/DIV 1.8V AT 6A/μs LOAD STEP COUT = 3 • 22μF 6.3V CERAMICS 470μF 4V SANYO POSCAP C3 = 100pF 4601A G06 2.5V Transient Response VOUT 50mV/DIV VOUT 50mV/DIV 3.3V Transient Response IOUT 5A/DIV IOUT 5A/DIV 20μs/DIV 2.5V AT 6A/μs LOAD STEP COUT = 3 • 22μF 6.3V CERAMICS 470μF 4V SANYO POSCAP C3 = 100pF 4601A G07 20μs/DIV 3.3V AT 6A/μs LOAD STEP COUT = 3 • 22μF 6.3V CERAMICS 470μF 4V SANYO POSCAP C3 = 100pF 4601A G08 4601afb 5 LTM4601A/LTM4601A-1 TYPICAL PERFORMANCE CHARACTERISTICS (See Figure 18 for all curves) Start-Up, IOUT = 0A VOUT 0.5V/DIV VOUT 0.5V/DIV IIN 1A/DIV Start-Up, IOUT = 12A (Resistive Load) IIN 0.5A/DIV 5ms/DIV VIN = 12V VOUT = 1.5V COUT = 470μF 3 22μF SOFT-START = 10nF 4601A G09 2ms/DIV VIN = 12V VOUT = 1.5V COUT = 470μF 3 22μF SOFT-START = 10nF 4601A G10 VIN to VOUT Step-Down Ratio 5.5 5.0 4.5 OUTPUT VOLTAGE (V) 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 0 2 4 6 8 10 12 14 16 18 20 INPUT VOLTAGE (V) 4601A G11 Track, IOUT = 12A 3.3V OUTPUT WITH 130k ADDED FROM VOUT TO fSET 5V OUTPUT WITH 100k RESISTOR ADDED FROM fSET TO GND 5V OUTPUT WITH NO RESISTOR ADDED FROM fSET TO GND 2.5V OUTPUT 1.8V OUTPUT 1.5V OUTPUT 1.2V OUTPUT VIN = 12V VOUT = 1.5V COUT = 470μF 3 22μF SOFT-START = 10nF TRACK/SS 0.5V/DIV VFB 0.5V/DIV VOUT 1V/DIV 2ms/DIV 4601A G12 Short-Circuit Protection, IOUT = 0A VOUT 0.5V/DIV IIN 1A/DIV VOUT 0.5V/DIV IIN 1A/DIV Short-Circuit Protection, IOUT = 12A 50μs/DIV VIN = 12V VOUT = 1.5V COUT = 470μF 3 22μF SOFT-START = 10nF 4601A G13 50μs/DIV VIN = 12V VOUT = 1.5V COUT = 470μF 3 22μF SOFT-START = 10nF 4601A G14 4601afb 6 LTM4601A/LTM4601A-1 PIN FUNCTIONS (See Package Description for Pin Assignment) 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. Review the figure below. PGND (Bank 2): Power ground pins for both input and output returns. VOSNS– (Pin M12): (–) Input to the Remote Sense Amplifier. This pin connects to the ground remote sense point. The remote sense amplifier is used for VOUT ≤3.3V. NC1 (Pin M12): No Connect On the LTM4601A-1. VOSNS+ (Pin J12): (+) Input to the Remote Sense Amplifier. This pin connects to the output remote sense point. The remote sense amplifier is used for VOUT ≤3.3V. NC2 (Pin J12): No Connect On the LTM4601A-1. DIFFVOUT (Pin K12): Output of the Remote Sense Amplifier. This pin connects to the VOUT_LCL pin. NC3 (Pin K12): No Connect On the LTM4601A-1. DRVCC (Pin E12): This pin normally connects to INTVCC for powering the internal MOSFET drivers. This pin can be biased up to 6V from an external supply with about 50mA capability, or an external circuit shown in Figure 16. This improves efficiency at the higher input voltages by reducing power dissipation in the module. TOP VIEW INTVCC PLLIN TRACK/SS RUN COMP MPGM INTVCC (Pin A7, D9): This pin is for additional decoupling of the 5V internal regulator. These pins are internally connected. Pin A7 is a test pin. 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 Applications Information. TRACK/SS (Pin A9): Output Voltage Tracking and SoftStart 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 stand alone regulator. Slave operation is performed by putting a resistor divider from the master output to the ground, and connecting the center point of the divider to this pin. See Applications Information. MPGM (Pins A12, B11): Programmable Margining Input. A resistor from this pin 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 Applications Information. To parallel LTM4601As, each requires an individual MPGM resistor. Do not tie MPGM pins together. Both pins are internally connected. Pin A12 is a test pin. fSET (Pins B12, C11): Frequency Set Internally to 850kHz. An external resistor can be placed from this pin to ground to increase frequency. This pin can be decoupled with a 1000pF capacitor. See Applications Information for frequency adjustment. Both pins are internally connected. Pin B12 is a test pin. VFB (Pin F12): The Negative Input of the Error Amplifier. Internally, this pin is connected to VOUT_LCL pin with a 60.4k precision resistor. Different output voltages can be programmed with an additional resistor between VFB and SGND pins. See Applications Information. MARG0 (Pin C12): This pin is the LSB logic input for the margining function. Together with the MARG1 pin will determine if margin high, margin low or no margin state is applied. The pin has an internal pull-down resistor of 50k. See Applications Information. A VIN B BANK 1 C D E F PGND BANK 2 G H J K VOUT BANK 3 L M MTP1 INTVCC MTP2 MTP3 fSET MARG0 MARG1 DRVCC VFB PGOOD SGND VOSNS+/NC2* DIFFVOUT/NC3* VOUT_LCL VOSNS–/NC1* 1 2 3 4 5 6 7 8 9 10 11 12 *LTM4601A-1 ONLY 4601afb 7 LTM4601A/LTM4601A-1 PIN FUNCTIONS (See Package Description for Pin Assignment) MARG1 (Pin D12): This pin is the MSB logic input for the margining function. Together with the MARG0 pin will determine if margin high, margin low or no margin state is applied. The pin has an internal pull-down resistor of 50k. See Applications Information. SGND (Pins H12, H11, G11): Signal Ground. These pins connect to PGND at output capacitor point. See Figure 15. COMP (Pin A11): 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 (Pins G12, F11): 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 (Pin A10): Run Control Pin. A voltage above 1.9V will turn on the module, and when 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. Limit current into the RUN pin to less than 1mA. VOUT_LCL (Pin L12): VOUT connects directly to this pin to bypass the remote sense amplifier, or DIFFVOUT connects to this pin when remote sense amplifier is used. VOUT_LCL can be connected to VOUT on the LTM4601A-1, VOUT is internally connected to VOUT_LCL with 50Ω in the LTM4601A-1. MTP1, MTP2, MPT3 (Pins C10, D10, D11 ): Extra Mounting Pads used for increased solder integrity strength. These pads must remain floating (electrical open circuit). SIMPLIFIED BLOCK DIAGRAM VIN VOUT_LCL R1 UVLO FUNCTION R2 >1.9V = ON