LTM4601IV-1-PBF

FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ LTM4601/LTM4601-1 12A DC/DC µModules with PLL, Output Tracking and Margining DESCRIPTIO The LTM®4601 is a complete 12A step-down switch mode DC/DC power supply with onboard switching controller, MOSFETs, inductor and all support components. The µModuleTM is housed in a small surface mount 15mm ×15mm × 2.8mm LGA package. Operating over an input voltage range of 4.5 to 20V, the LTM4601 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 in unused space on the back side of PC boards for high density point of load regulation. The µModule can be synchronized with an external clock for reducing undesirable frequency harmonics and allows PolyPhase® operation for high load currents. A high switching frequency and adaptive on-time current mode architecture deliver a very fast transient response to line and load changes without sacrificing stability. 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 LTM4601-1. , LTC, LT 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. Protected by U.S. Patents, including 5481178, 5847554, 6580258, 6304066, 6476589, 6774611, 6677210 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 Parallel Multiple µModules for Current Sharing Differential Remote Sensing for Precision Regulation (LTM4601 Only) PLL Frequency Synchronization ±1.5% Regulation 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 Small Footprint, Low Profile (15mm × 15mm × 2.8mm) Surface Mount LGA Package APPLICATIO S ■ ■ ■ ■ Telecom and Networking Equipment Servers Industrial Equipment Point of Load Regulation TYPICAL APPLICATIO VIN 4.5V TO 20V VIN PGOOD RUN COMP INTVCC DRVCC MPGM SGND 1.5V/12A Power Supply with 4.5V to 20V Input 95 CLOCK SYNC TRACK/SS CONTROL PLLIN TRACK/SS VOUT VFB MARG0 MARG1 VOUT_LCL DIFFVOUT VOSNS+ VOSNS– fSET RSET 40.2k 4601 TA01a Efficiency and Power Loss vs Load Current 4.0 EFFICIENCY 90 VOUT 1.5V 12A 85 EFFICIENCY (%) 80 75 70 65 60 POWER LOSS 55 50 0 2 4 6 8 10 OUTPUT CURRENT (A) 12 14 1.0 0.5 12VIN 5VIN 2.0 1.5 5VIN 3.5 12VIN 3.0 2.5 100pF MARGIN CONTROL ON/OFF CIN LTM4601 COUT R1 392k 5% MARGIN PGND U U U POWER LOSS (W) 4601 TA01b 4601f 1 LTM4601/LTM4601-1 ABSOLUTE (Note 1) AXI U RATI GS PACKAGE/ORDER I FOR ATIO INTVCC PLLIN TRACK/SS RUN COMP MPGM TOP VIEW 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 – 1V Operating Temperature Range (Note 2) ... –40°C to 85°C Junction Temperature ........................................... 125°C Storage Temperature Range................... –55°C to 125°C VIN PGND VOUT fSET MARG0 MARG1 DRVCC VFB PGOOD SGND VOSNS+/NC2* DIFFVOUT/NC3* VOUT_LCL VOSNS–/NC1* LGA PACKAGE 118-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 *LTM4601-1 ONLY ORDER PART NUMBER LTM4601EV#PBF LTM4601IV#PBF LTM4601EV-1#PBF LTM4601IV-1#PBF LGA PART MARKING* LTM4601V LTM4601V LTM4601V-1 LTM4601V-1 Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. ELECTRICAL CHARACTERISTICS SYMBOL VIN(DC) VOUT(DC) PARAMETER Input DC Voltage Output Voltage The ● 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 ● MIN 4.5 1.478 1.478 TYP MAX 20 UNITS V V V V A A mA mA mA mA µA A A A 4601f CIN = 10µF ×3, COUT = 200µF VIN = 5V, VOUT = 1.5V, IOUT = 0A VIN = 12V, VOUT = 1.5V, IOUT = 0A IOUT = 0A IOUT = 0A. VOUT = 1.5V VIN = 5V VIN = 12V VIN = 12V, VOUT = 1.5V, No Switching VIN = 12V, VOUT = 1.5V, Switching Continuous VIN = 5V, VOUT = 1.5V, 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 ● ● 1.5 1.5 3.2 0.6 0.7 3.8 38 2.5 42 22 1.81 3.63 4.29 1.522 1.522 4 Input Specifications VIN(UVLO) IINRUSH(VIN) Undervoltage Lockout Threshold Input Inrush Current at Startup IQ(VIN,NOLOAD) Input Supply Bias Current IS(VIN) Input Supply Current 2 U W U U WW W LTM4601/LTM4601-1 ELECTRICAL CHARACTERISTICS SYMBOL INTVCC IOUTDC ΔVOUT(LINE) VOUT(MIN) ΔVOUT(0A-12A) VOUT(MIN) VOUT(AC) Output Ripple Voltage Load Regulation Accuracy VOUT = 1.5V, 0A to 12A VIN = 12V, Remote Sense Amplifier VIN = 12V (LTM4601-1) 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 ● ● The ● 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 VIN = 12V, RUN > 2V CONDITIONS No Load MIN 4.7 0 TYP 5 MAX 5.3 12 UNITS V A Output Specifications Output Continuous Current Range VIN = 12V, VOUT = 1.5V (See Output Current Derating Curves for Different VIN, VOUT and TA) Line Regulation Accuracy VOUT = 1.5V, IOUT = 0A, VIN from 4.5V to 20V ● 0.3 % 0.25 1 20 18 850 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 0.7 ms ms ΔVOUTLS Peak Deviation for Dynamic Load 35 35 25 17 17 0 0 1 3 2 INTVCC – 1 INTVCC 1.25 mV mV µs A A V V mV V/V MHz V/µs kΩ dB 0.606 1.9 –2.0 100 V V µA ns 4601f 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) (LTM4601 Only, Not Supported in the LTM4601-1) VOSNS+, VOSNS– CM Range DIFFVOUT Range VOS AV GBP SR RIN CMRR Control Stage VFB VRUN ISS/TRACK tON(MIN) Error Amplifier Input Voltage Accuracy RUN Pin On/Off Threshold Soft-Start Charging Current Minimum On Time VSS/TRACK = 0V (Note 4) IOUT = 0A, VOUT = 1.5V ● Common Mode Input Voltage Range VIN = 12V, RUN > 2V Output Voltage Range Input Offset Voltage Magnitude Differential Gain Gain Bandwidth Product Slew Rate Input Resistance Common Mode Rejection Mode VOSNS+ to GND VIN = 12V, DIFF OUT Load = 100k 20 100 0.594 1 –1.0 0.6 1.5 –1.5 50 3 LTM4601/LTM4601-1 The ● 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 tOFF(MIN) RPLLIN IDRVCC RFBHI VMPGM VMARG0, VMARG1 PGOOD Output ΔVFBH ΔVFBL ΔVFB(HYS) PGOOD Upper Threshold PGOOD Lower Threshold PGOOD Hysteresis VFB Rising VFB Falling VFB Returning 7 –7 10 –10 1.5 13 –13 % % % PARAMETER Minimum Off Time PLLIN Input Resistance Current into DRVCC Pin Resistor Between VOUT and VFB Margin Reference Voltage MARG0, MARG1 Voltage Thresholds VOUT = 1.5V, IOUT = 1A, Frequency = 850kHz, DRVCC = 5V 60.098 CONDITIONS (Note 4) MIN TYP 250 50 18 60.4 1.18 1.4 25 60.702 MAX 400 UNITS ns kΩ mA kΩ V V ELECTRICAL CHARACTERISTICS 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 LTM4601E/LTM4601E-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 LTM4601I/LTM4601I-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. 4601f 4 LTM4601/LTM4601-1 TYPICAL PERFOR A CE CHARACTERISTICS (See Figure 18 for all curves) Efficiency vs Load Current with 5VIN 100 95 90 EFFICIENCY (%) EFFICIENCY (%) 85 80 75 70 65 60 0 0.6VOUT 1.2VOUT 1.5VOUT 2.5VOUT 3.3VOUT 5 10 15 4601 G01 EFFICIENCY (%) OUTPUT CURRENT (A) 1.2V Transient Response VOUT 50mV/DIV IOUT 5A/DIV VOUT 50mV/DIV 20µs/DIV 1.2V AT 6A/µs LOAD STEP COUT = 3 • 22µF 6.3V CERAMICS 470µF 4V SANYO POSCAP C3 = 100pF 2.5V Transient Response VOUT 50mV/DIV VOUT 50mV/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 UW Efficiency vs Load Current with 12VIN 100 95 90 85 80 75 70 65 60 55 50 0 10 5 OUTPUT CURRENT (A) 15 4601 G02 Efficiency vs Load Current with 20VIN 100 95 90 85 80 75 70 65 60 0 10 5 OUTPUT CURRENT (A) 1.2VOUT 1.5VOUT 2.5VOUT 3.3VOUT 5.0VOUT 15 4601 G03 0.6VOUT 1.2VOUT 1.5VOUT 2.5VOUT 3.3VOUT 5VOUT 1.5V Transient Response VOUT 50mV/DIV 1.8V Transient Response IOUT 5A/DIV IOUT 5A/DIV 4601 G04 20µs/DIV 1.5V AT 6A/µs LOAD STEP COUT = 3 • 22µF 6.3V CERAMICS 470µF 4V SANYO POSCAP C3 = 100pF 4601 G05 20µs/DIV 1.8V AT 6A/µs LOAD STEP COUT = 3 • 22µF 6.3V CERAMICS 470µF 4V SANYO POSCAP C3 = 100pF 4601 G06 3.3V Transient Response IOUT 5A/DIV 20µs/DIV 3.3V AT 6A/µs LOAD STEP COUT = 3 • 22µF 6.3V CERAMICS 470µF 4V SANYO POSCAP C3 = 100pF 4601 G07 4601 G08 4601f 5 LTM4601/LTM4601-1 TYPICAL PERFOR A CE CHARACTERISTICS (See Figure 18 for all curves) Start-Up, IOUT = 0A VOUT 0.5V/DIV VOUT 0.5V/DIV IIN 1A/DIV IIN 0.5A/DIV 5ms/DIV VIN = 12V VOUT = 1.5V COUT = 470µF 3 × 22µF SOFT-START = 10nF 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) 4601 G11 Short-Circuit Protection, IOUT = 0A VOUT 0.5V/DIV IIN 1A/DIV VOUT 0.5V/DIV IIN 1A/DIV 50µs/DIV VIN = 12V VOUT = 1.5V COUT = 470µF 3 × 22µF SOFT-START = 10nF 6 UW Start-Up, IOUT = 12A (Resistive Load) 4601 G09 2ms/DIV VIN = 12V VOUT = 1.5V COUT = 470µF 3 × 22µF SOFT-START = 10nF 4601 G10 Track, IOUT = 12A 3.3V OUTPUT WITH 130k FROM VOUT TO ION 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 TRACK/SS 0.5V/DIV VFB 0.5V/DIV VOUT 1V/DIV 2ms/DIV VIN = 12V VOUT = 1.5V COUT = 470mF 3 ´ 22mF SOFT-START = 10nF 4601 G12 Short-Circuit Protection, IOUT = 12A 4601 G13 50µs/DIV VIN = 12V VOUT = 1.5V COUT = 470µF 3 × 22µF SOFT-START = 10nF 4601 G14 4601f LTM4601/LTM4601-1 PI FU CTIO S 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 LTM4601-1. 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 LTM4601-1. DIFFVOUT (Pin K12): Output of the Remote Sense Amplifier. This pin connects to the VOUT_LCL pin. NC3 (Pin K12): No Connect On the LTM4601-1. 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. INTVCC (Pin A7): This pin is for additional decoupling of the 5V internal regulator. A VIN B BANK 1 C D E PGND F BANK 2 G H J VOUT K BANK 3 L M 1 2 3 4 5 6 7 8 9 10 11 12 *LTM4601-1 ONLY INTVCC PLLIN TRACK/SS RUN COMP MPGM fSET MARG0 MARG1 DRVCC VFB PGOOD SGND VOSNS+/NC2* DIFFVOUT/NC3* VOUT_LCL VOSNS–/NC1* U U U (See Package Description for Pin Assignment) 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 (Pin A12): 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 LTM4601s, each requires an individual MPGM resistor. Do not tie MPGM pins together. fSET (Pin B12): 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. 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. TOP VIEW 4601f 7 LTM4601/LTM4601-1 PI FU CTIO S 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. 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 (Pin H12): Signal Ground. This pin connects to PGND at output capacitor point. 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). SI PLIFIED BLOCK DIAGRA VOUT_LCL >2V = ON