LTM4603-1

FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ LTM4603/LTM4603-1 6A DC/DC µModule with PLL, Output Tracking and Margining DESCRIPTIO The LTM®4603 is a complete 6A 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 LTM4603 supports an output voltage range of 0.6V to 5V as well as output voltage tracking and margining. The high efficiency design delivers 6A continuous current (8A peak). Only bulk input and output capacitors are needed to complete the design. The low profile (2.8mm) and light weight (1.73g) package easily mounts on the 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 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 LTM4603-1. The LTM4603/LTM4603-1 are pin compatible with the 12A LTM4601/LTM4601-1. , 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 Switch Mode Power Supply Wide Input Voltage Range: 4.5V to 20V 6A DC Typical, 8A Peak Output Current 0.6V to 5V Output Voltage Output Voltage Tracking and Margining Remote Sensing for Precision Regulation (LTM4603 Only) Typical Operating Frequency: 1MHz PLL Frequency Synchronization 1.5% Regulation Current Foldback Protection (Disabled at Start-Up) Pin Compatible with the LTM4601 Pb-Free (e4) RoHS Compliant Package with Gold Finish Pads Ultrafast Transient Response Current Mode Control Up to 93% 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 Efficiency vs Load Current with 12VIN 1.00 0.95 CLOCK SYNC TRACK/SS CONTROL EFFICIENCY (%) 0.90 0.85 VOUT 1.5V 6A 0.80 0.75 0.70 0.65 0.60 0.55 0.50 0.45 0.40 0 4603 TA01a 4603 TA01b 1.5V/6A Power Supply with 4.5V to 20V Input PLLIN TRACK/SS VOUT VFB MARG0 MARG1 VOUT_LCL DIFFVOUT VOSNS+ VOSNS– fSET 100pF MARGIN CONTROL 13.3k ON/OFF CIN LTM4603 COUT 392k 5% MARGIN PGND U 1 U U 12VIN, 1.2VOUT 12VIN, 1.5VOUT 12VIN, 1.8VOUT 12VIN, 2.5VOUT 12VIN, 3.3VOUT 12VIN, 5VOUT 4 3 2 5 OUTPUT CURRENT (A) 6 7 4603f 1 LTM4603/LTM4603-1 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 Remote Sense Amp) ............................ –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– .................................. 0V 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 *LTM4603-1 Only ORDER PART NUMBER LTM4603EV#PBF LTM4603IV#PBF LTM4603EV-1#PBF LTM4603IV-1#PBF LGA PART MARKING* LTM4603V LTM4603V LTM4603V-1 LTM4603V-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 TYP MAX 20 UNITS V CIN = 10µF ×2, COUT = 2×, 100µF/X5R/ Ceramic 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 ● ● 1.478 1.478 1.5 1.5 3.2 0.6 0.7 3.8 25 2.5 43 22 1.522 1.522 4 Input Specifications VIN(UVLO) IINRUSH(VIN) Undervoltage Lockout Threshold Input Inrush Current at Startup V A A mA mA mA mA µA 4603f IQ(VIN,NOLOAD) Input Supply Bias Current 2 U V V W U U WW W LTM4603/LTM4603-1 ELECTRICAL CHARACTERISTICS SYMBOL IS(VIN) PARAMETER Input Supply Current 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 VIN = 12V, VOUT = 1.5V, IOUT = 6A VIN = 12V, VOUT = 3.3V, IOUT = 6A VIN = 5V, VOUT = 1.5V, IOUT = 6A No Load 4.7 0 MIN TYP 0.85 1.78 2.034 5 5.3 6 MAX UNITS A A A V A INTVCC Output Specifications IOUTDC VIN = 12V, RUN > 2V Output Continuous Current Range VIN = 12V, VOUT = 1.5V (See Output Current Derating Curves for Different VIN, VOUT and TA) VOUT = 1.5V, IOUT = 0A, VIN = 4.5V to 20V VOUT = 1.5V, IOUT = 0A to 6A VIN = 12V, with Remote Sense Amp VIN = 12V, LTM4603-1 IOUT = 0A, COUT = 2×, 100µF/X5R/Ceramic VIN = 12V, VOUT = 1.5V VIN = 5V, VOUT = 1.5V IOUT = 3A, VIN = 12V, VOUT = 1.5V COUT = 2×, 100µF/X5R/Ceramic, VOUT = 1.5V, IOUT = 0A VIN = 12V VIN = 5V COUT = 2×, 100µF/X5R/Ceramic, 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 ● VOUT(NOM) – VOUT(ΔLINE) Line Regulation Accuracy VOUT(NOM) VOUT(NOM) – VOUT(ΔLOAD) Load Regulation Accuracy VOUT(NOM) VOUT(AC) Output Ripple Voltage 0.3 % ● ● 0.25 0.5 10 10 1000 % % mVP-P mVP-P kHz fS ΔVOUT(START) Output Ripple Voltage Frequency Turn-On Overshoot, TRACK/SS = 10nF 20 20 mV mV tSTART Turn-On Time, TRACK/SS = Open 0.5 0.7 ms ms ΔVOUTLS Peak Deviation for Dynamic Load 35 35 25 8 8 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 tSETTLE IOUTPK Settling Time for Dynamic Load Step Load: 0% to 50% to 10% of Full Load VIN = 12V Output Current Limit COUT = 2×, 100µF/X5R/Ceramic VIN = 12V, VOUT = 1.5V VIN = 5V, VOUT = 1.5V Remote Sense Amp (LTM4603 Only, Not Supported in the LTM4603-1) (Note 3) VOSNS+, VOSNS– CM Range DIFFVOUT Range VOS AV GBP SR RIN CMRR 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 Ratio VOSNS+ to GND VIN = 12V, DIFF OUT Load = 100k 20 100 4603f 3 LTM4603/LTM4603-1 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 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 13 –13 3 0.4 % % % 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 and VFB Margin Reference Voltage MARG0, MARG1 Voltage Thresholds VOUT = 1.5V, IOUT = 1A, Frequency = 1MHz, DRVCC = 5V 60.098 VSS/TRACK = 0V (Note 4) (Note 4) IOUT = 0A, VOUT = 1.5V ● ELECTRICAL CHARACTERISTICS PARAMETER CONDITIONS MIN 0.594 1 –1 TYP 0.6 1.5 –1.5 50 250 50 18 60.4 1.18 1.4 MAX 0.606 1.9 –2 100 400 25 60.702 UNITS 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 LTM4603E/LTM4603-1 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 LTM4603E/LTM4603-1 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. 4603f 4 LTM4603/LTM4603-1 TYPICAL PERFOR A CE CHARACTERISTICS (See Figure 18 for all curves) Efficiency vs Load Current with 5VIN 1.00 0.95 0.90 EFFICIENCY (%) 0.85 EFFICIENCY (%) 0.80 0.75 0.70 0.65 0.60 0.55 0.50 0 1 5VIN, 0.6VOUT 5VIN, 1.2VOUT 5VIN, 1.5VOUT 5VIN, 1.8VOUT 5VIN, 2.5VOUT 5VIN, 3.3VOUT 4 3 2 5 OUTPUT CURRENT (A) 6 7 4603 G01 EFFICIENCY (%) 1.2V Transient Response LOAD STEP 1A/DIV VOUT 50mV/DIV 25µs/DIV 1.2V AT 3A/µs LOAD STEP COUT: 1x 22µF, 6.3V CERAMIC 1x 330µF, 4V SANYO POSCAP 2.5V Transient Response LOAD STEP 1A/DIV VOUT 50mV/DIV 25µs/DIV 2.5V AT 3A/µs LOAD STEP COUT: 1x 22µF, 6.3V CERAMIC 1x 330µF, 4V SANYO POSCAP UW Efficiency vs Load Current with 12VIN 1.00 0.95 0.90 0.85 0.80 0.75 0.70 0.65 0.60 0.55 0.50 0.45 0.40 0 1 12VIN, 1.2VOUT 12VIN, 1.5VOUT 12VIN, 1.8VOUT 12VIN, 2.5VOUT 12VIN, 3.3VOUT 12VIN, 5VOUT 4 3 2 5 OUTPUT CURRENT (A) 6 7 4603 G02 Efficiency vs Load Current with 20VIN 0.95 0.90 0.85 0.80 0.75 0.70 0.65 0.60 0.55 0.50 0.45 0.40 0 1 20VIN, 1.5VOUT 20VIN, 1.8VOUT 20VIN, 2.5VOUT 20VIN, 3.3VOUT 20VIN, 5VOUT 4 3 2 5 OUTPUT CURRENT (A) 6 7 4603 G03 1.5V Transient Response 1.8V Transient Response LOAD STEP 1A/DIV LOAD STEP 1A/DIV VOUT 50mV/DIV VOUT 50mV/DIV 4603 G04 25µs/DIV 1.5V AT 3A/µs LOAD STEP COUT: 1x 22µF, 6.3V CERAMIC 1x 330µF, 4V SANYO POSCAP 4603 G05 25µs/DIV 1.8V AT 3A/µs LOAD STEP COUT: 1x 22µF, 6.3V CERAMIC 1x 330µF, 4V SANYO POSCAP 4603 G06 3.3V Transient Response LOAD STEP 1A/DIV VOUT 50mV/DIV 4603 G07 25µs/DIV 3.3V AT 3A/µs LOAD STEP COUT: 1x 22µF, 6.3V CERAMIC 1x 330µF, 4V SANYO POSCAP 4603 G08 4603f 5 LTM4603/LTM4603-1 TYPICAL PERFOR A CE CHARACTERISTICS (See Figure 18 for all curves) Start-Up, IOUT = 0A Start-Up, IOUT = 6A (Resistive Load) Short-Circuit Protection, IOUT = 0A VOUT 0.5V/DIV 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 4603 G09 Short-Circuit Protection, IOUT = 6A 5.5 5.0 VOUT 0.5V/DIV 4.5 OUTPUT VOLTAGE (V) 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 IIN 2A/DIV 100µs/DIV VIN = 12V VOUT = 1.5V COUT = 1x 22µF, 6.3V CERAMIC 1x 330µF, 4V SANYO POSCAP SOFT-START = 3.9nF 4603 G12 6 UW VOUT 0.5V/DIV VOUT 0.5V/DIV IIN 0.5A/DIV IIN 2A/DIV 1ms/DIV VIN = 12V VOUT = 1.5V COUT = 1x 22µF, 6.3V CERAMIC 1x 330µF, 4V SANYO POSCAP SOFT-START = 3.9nF 4603 G10 100µs/DIV VIN = 12V VOUT = 1.5V COUT = 1x 22µF, 6.3V CERAMIC 1x 330µF, 4V SANYO POSCAP SOFT-START = 3.9nF 4603 G11 VIN to VOUT Step-Down Ratio 3.3V OUTPUT WITH 82.5k FROM VOUT TO fSET 5V OUTPUT WITH 150k 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 0 2 4 6 8 10 12 14 16 18 20 INPUT VOLTAGE (V) 4603 G13 4603f LTM4603/LTM4603-1 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 LTM4603-1. 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 LTM4603-1. DIFFVOUT (Pin K12): Output of the Remote Sense Amplifier. This pin connects to the VOUT_LCL pin. NC3 (Pin K12): No Connect on the LTM4603-1. 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 modules. 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 INTVCC PLLIN TRACK/SS RUN COMP MPGM fSET MARG0 MARG1 DRVCC VFB PGOOD SGND VOSNS+ (NC2, LTM4603-1) DIFFVOUT (NC3, LTM4603-1) VOUT_LCL VOSNS– (NC1, LTM4603-1) 4603f U U U (See Package Description for Pin Assignment) 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 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 LTM4603s, each requires an individual MPGM resistor. Do not tie MPGM pins together. fSET (Pin B12): Frequency Set Internally to 1MHz. 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 with a 60.4k precision resistor. Different output voltages can be TOP VIEW 7 LTM4603/LTM4603-1 PI FU CTIO S 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. 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 SI PLIFIED BLOCK DIAGRA VOUT_LCL >2V = ON