DEMO MANUAL DC2745A LTC3309A 5V, 6A Synchronous Step-Down Silent Switcher in 2mm x 2mm LQFN DESCRIPTION Demonstration Circuit 2745A features the LTC(R)3309A 5V, 6A synchronous step-down silent switcher operating as a 2MHz, 3.3V to 1.2V 6A buck regulator. The LTC3309A supports adjustable output voltages from 0.5V to VIN, and operating frequencies from 1MHz up to 3MHz. The LTC3309A is a compact, ultralow emission, high efficiency, and high speed synchronous monolithic stepdown switching regulator. A minimum on-time of 22ns enables high VIN to low VOUT conversion ratios at high switching frequencies. The DC2745A operating mode may be selected as Burst Mode(R) operation, skip or forced continuous (FC) mode. Setting JP1 to the FC/SYNC position will allow the LTC3309A to sync to a clock frequency from 1MHz to 3MHz. The LTC3309A operates in forced continuous mode when syncing to an external clock. The DC2745A is set to a fixed 2MHz frequency by connecting RT to VIN through a 0 resistor, R9. The frequency can be easily changed by removing R9 and setting an appropriate resistor in the R4 location to obtain the desired frequency. Refer to the LTC3309A data sheet for the proper RT value for a desired switching frequency. The DC2745A also has an EMI filter to reduce conducted EMI. This EMI filter can be included by applying the input voltage at the VIN EMI terminal. The EMI performance of the board is shown in the EMI Test Results section. The red lines in the EMI performance graphs illustrate the CISPR25 Class 5 peak limits for the conducted and radiated emission tests. The LTC3309A data sheet gives a complete description of the device, operation and application information. The data sheet must be read in conjunction with this demo manual. The LTC3309A is assembled in a 2mm x 2mm LQFN package with exposed pads for low thermal resistance. The layout recommendations for low EMI operation and maximum thermal performance are available in the data sheet section Low EMI PCB Layout. The Efficiency vs Load graph shows the efficiency and the power loss of the circuit with a 3.3V input in Burst Mode operation. Design files for this circuit board are available. All registered trademarks and trademarks are the property of their respective owners. PERFORMANCE SUMMARY Specifications are at TA = 25C CONDITIONS SYMBOL PARAMETER VIN Input Voltage Range 2.25 VOUT VOUT Voltage Range* 1.183 IOUT OUTPUT Current fSW Switching Frequency tON Top Switch Minimum On Time Duty Cycle Top Switch Duty Cycle VIN Greater than VOUT MIN TYP 1.2 1 MAX UNITS 5.5 V 1.217 V 6 A 3 MHz 22 ns 100 % *With 1% resistors. Accuracy will improve to within 1% using 0.1% FB resistors. Rev. 0 1 DEMO MANUAL DC2745A BOARD PHOTO CIRCUIT SCHEMATIC High Efficiency, 2MHz, 1.2V 6A Step-Down Converter LTC3309A 3.3V to 1.2V Efficiency and Powerloss DC2745A in Burst Mode VIN = 2.25V TO 5.5V 1F 0201 1F 0201 VIN VIN 10F 220nH 6.8pF LTC3309A VOUT 1.2V 6A SW SW FB VIN 140k 100k 10nF MODE/SYNC RT PGND 1 70 0.1 60 50 40 30 AGND 20 PGOOD 10 dc2745a T01a fOSC = 2MHz 47F x2 EFFICIENCY 80 POWER LOSS (W) EN 90 EFFICIENCY (%) 10F 10 100 0.01 POWER LOSS 0 0.001 VIN = 3.3V VOUT = 1.2V fSW = 2MHz 0.001 XFRMS INC. XFHCL43LT-R22 0.01 0.1 1 LOAD CURRENT (mA) 6 0.0001 DC2745A TA01b 2 Rev. 0 DEMO MANUAL DC2745A EMI TEST RESULTS CISPR25 Conducted Emisions with Class 5 Peak Limits (Voltage Method) 60 AMPLITUDE (dBV/m) 50 40 30 20 10 0 -10 -20 PEAK LIMIT PEAK 0 10 20 30 40 50 60 70 FREQUENCY (MHz) 80 90 100 dc2745a G01 DC2745A DEMO BOARD (WITH EMI FILTER INSTALLED) 3.3V INPUT TO 1.2V OUTPUT AT 4.8A, fSW = 2MHz Radiated EMI Performance (CISPR25 Radiated Emisions Test with Class 5 Peak Limits) 50 Radiated EMI Performance (CISPR25 Radiated Emisions Test with Class 5 Peak Limits) 50 HORIZONTAL POLARIZATION PEAK DETECTOR 45 40 AMPLITUDE (dBV/m) 35 30 25 20 15 10 35 30 25 20 15 10 PEAK LIMIT PEAK 5 0 100 200 300 400 500 600 FREQUENCY (MHz) 700 800 900 1000 dc2745a G02 DC2629A DEMO BOARD (WITH EMI FILTER INSTALLED) 3.3V INPUT TO 1.2V OUTPUT AT 4.8A, fSW = 2MHz PEAK LIMIT PEAK 5 0 0 100 200 300 400 500 600 FREQUENCY (MHz) 700 800 Load Transient Response Forced Continuous Mode 900 1000 dc2745a G03 DC2745A DEMO BOARD (WITH EMI FILTER INSTALLED) 3.3V INPUT TO 1.2V OUTPUT AT 4.8A, fSW = 2MHz LTC3309A Load Regulation 1.210 VIN = 3.3V 1.208 VOUT = 1.2V FORCED CONTINUOUS MODE 1.206 VSG_INPUT 2V/DIV 1.204 VRSNS 200mV/DIV VOUT (V) AMPLITUDE (dBV/m) VERTICAL POLARIZATION PEAK DETECTOR 45 40 0 110 VOUT 50mV/DIV 1.202 1.200 1.198 1.196 20s/DIV 3.3VIN TO 1.2V OUT LOADSTEP 1.2A TO 4.8A 1A/s dc2745a G04 1.194 1.192 1.190 0.0 1.0 2.0 3.0 IOUT (A) 4.0 5.0 6.0 dc2745a G05 Rev. 0 3 DEMO MANUAL DC2745A QUICK START PROCEDURE Demonstration circuit 2745A is easy to set up and use to evaluate the performance of the LTC3309A. Refer to Figure1 for proper measurement equipment setup and follow the procedure below: NOTE: For accurate VIN, VOUT and efficiency measurements, measure VIN at the VIN SNSE and GND SNSE turrets and VOUT at the VOUT SNSE and GND SNSE turrets as illustrated as VM1 and VM2 in Figure1. When measuring the input or output voltage ripple, care must be taken to avoid a long ground lead on the oscilloscope probe. 1. Set the JP1 Jumper to the SKIP position and JP2 to the HI position. 2. With power off, connect the input power supply to VIN and GND. If the input EMI filter is desired, connect the input power supply to VIN EMI. 3. Slowly increase PS1 to 1.0V. If AM1 reads less than 20ma, increase PS1 to 3.3V. Verify that VM1 reads 3.3V and VM2 reads 1.2V. 4. Connect an oscilloscope voltage probe as shown in Figure2 in parallel with VM2. Set Channel to AC coupled, voltage scale to 20mV and time base to 10s. Observe the VOUT ripple voltage. NOTE: Measure the output voltage ripple by touching the probe tip directly across the output turrets or to TP1 as shown in Figure2. TP1 is designed for a 50 coax cable to reduce any high frequency noise that might couple into the oscilloscope probes. 5. Verify that PGOOD turret is high. 6. Increasing the load by 1A intervals up to 6A and record VM1, VM2, AM1 and AM2 for each interval. 7. Repeat step 6 for PS1 set to 2.5V and again for PS1 set to 5.0V. 8. Set the load to a constant 3A. Remove the oscilloscope voltage probe from VOUT. Place a ground clip on PGND terminal and set the voltage scale to 1V and the time scale to 500ns/Division. Trigger on the rising edge of the voltage probe. Using a tip on the voltage probe, contact the SW node on the pad of L1. Observe the 4 duty cycle and the period of the switching waveform (~500nanoseconds). 9. Set the load current to 0.5A and repeat step 8. Observe that the switching waveform is now operating in Pulse Skip Mode. 10.Move the jumper on JP2 to LO. Verify that VOUT reads 0V and verify that PGOOD is low. Return jumper on JP2 to HI and verify VM2 is 1.2V and verify PGOOD2 is high. 11.If forced continuous or Burst Mode is desired, set PS1 to 0V. Move JP1 to FC/SYNC or BURST. Repeat steps 3 through 9. In step 9 observe that the switching waveform is now operating in forced continuous or Burst Mode. 12.To change the frequency, remove R9 if installed. Install the desired RT resistor in the R4 location. Size the inductor and output capacitors to provide the desired inductor ripple and a stable output. Refer to the LTC3309A data sheet and LTPowerCAD for more information on choosing the required components. 13.To test the transient response with a base load, add the desired resistor to produce a minimum load between VOUT and RSNS turrets (RL shown on Figure1). Note that the total load resistance will be RL plus R11 (100m). 14.Adjust a signal generator with a 10ms period, 10% duty cycle and an amplitude from 1V to 2V to start. 15.Measure the RSNS voltage to observe the current, VRSNS/100m. Adjust the amplitude of the pulse to provide the desired transient. Adjust the rising and falling edge of the pulse to provide the desired ramp rate. Refer to the following equations and the optional transient response circuit shown in Figure 3: IOUT = VRSNS/100m (2) where VRSNS = VSG_INPUT - VGS (3) 16.When done, turn off PS1 and Load. Remove all connections to demo board. Rev. 0 DEMO MANUAL DC2745A QUICK START PROCEDURE Figure1. Test Setup for the DC2745A Demo Board Rev. 0 5 DEMO MANUAL DC2745A QUICK START PROCEDURE Figure2. Technique for Measuring Output Ripple and Step Response a) With a Scope Probe. b) With a Low Inductance Connector (Not Supplied). VOUT TP1 VOUT 5 6 7 8 SG_INPUT 20V MAX 4 E19 Q1 SIR426DP-T1-GE3 R10 10k 5% 1 2 3 R11 0.1k 2W 2512 E20 RSNS TP2 ISTEP DC2745A F03 Figure3. Optional Transient Response Circuit 6 Rev. 0 DEMO MANUAL DC2745A THEORY OF OPERATION Introduction to the DC2745A The DC2745A demonstration circuit features the LTC3309A, a low voltage synchronous step-down silent switcher. The LTC3309A is a monolithic, constant frequency, current mode step-down DC/DC converter. An oscillator, with frequency set using a resistor on the RT pin, turns on the internal top power switch at the beginning of each clock cycle. Current in the inductor then increases until the top switch comparator trips and turns off the top power switch. If the EN pin is low, the LT3309A is in shutdown and in a low quiescent current state. When the EN pin is above its threshold, the switching regulator will be enabled. The MODE/SYNC pin sets the switching mode to pulse skip, forced continuous, or Burst Mode. If an external 1MHz to 3MHz clock is connected to the MODE/SYNC turret while the JP1 is set to the FC/SYNC position, the LTC3309A switching frequency will sync to the external clock while operating in forced continuous mode. See the LTC3309A data sheet for more detailed information. The maximum allowable operating frequency is influenced by the minimum on time of the top switch, the ratio of VOUT to VIN. The maximum allowable operating frequency may be calculated using a minimum tON of 42ns in the formula below. fSW(MAX) = VOUT VIN(MAX) * tON(MIN) Select an operating switching frequency below fSW(MAX). The recommended ripple current in the output inductor is 1.8A peak-to-peak for the LTC3309A. This determines the recommended inductor value for the application. playing on the scope. The demo board is set up to solder an U.FL, RECEPT, ST SMD, 0Hz to 6GHz 50 connector (TP1) near the output cap C4. These pads can also be used to solder a coax cable or other oscilloscope probe connector if desired. 29mV 10mV/DIV 500ns/DIV dc2745a G06 VIN = 3.3V VOUT = 1.2V IOUT = 6A The high frequency spikes are partially attributed to the inter-winding capacitance of the inductor and the voltage step is partially attributed to the inductance in the output capacitors. This can be reduced by choosing low ESL capacitors or adding small low ESL capacitors in parallel to the output capacitors as close to the inductor as possible. Adding capacitors close to the load creates a filter between the output caps, trace inductance, and load decoupling caps and will also help to reduce the ripple. Below is the output ripple using a 500MHz scope, 50 probe with C4 and C5 reduced to 22F 0603 caps. The capacitors near the VOUT turret on the bottom of the board were also populated with C17 = 1F 0402, plus C18 and C19 = 10F 0603 capacitors. The output ripple was measured at TP3 on the bottom of the board near the VOUT turrets. Accurately Measuring Output Ripple of the LTC3309A With the fast edge rates of the circuit, high frequency noise can be observed when measuring the output voltage with 1M terminated oscilloscope probes. To better view the output ripple with oscilloscopes of 400MHz bandwidth and above a 50 coax cable connected as close to the output caps as possible should be used with the oscilloscope channel terminated to 50 at the scope. This will help to reduce the noise coupling onto and dis- 9mV 10mV/DIV 500ns/DIV dc2745a G07 VIN = 3.3V VOUT = 1.2V IOUT = 6A C4, C5 = 22F 0603 C17 = 1F 0402 C18, C19 = 10F 0603 Rev. 0 7 DEMO MANUAL DC2745A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 1 C1 CAP., 0.01F, X7R, 10V, 10%, 0201 MURATA, GRM033R70J103KA01D 2 2 C2, C3 CAP., 10F, X7S, 6.3V, 20%, 0603 TDK, C1608X7S0J106M080AC 3 2 C4, C5 CAP., 47F, X6S, 6.3V, 20%, 0805 TAIYO YUDEN, JMK212BC6476MG-T 4 1 C6 CAP., 6.8pF, C0G/NP0, 50V, 0.5pF, 0402 AVX, 04025A6R8DAT2A 5 2 C15, C16 CAP., 1F, X7T, 6.3V, 20%, 0201 MURATA, GRM033D70J105ME01D 6 1 L1 IND., 0.22H, PWR, SHIELDED, 20%, 8A, 13m, 2.5mmx2.0mm, SMD XFMRS, INC., XFHCL43LT-R22M 7 1 R1 RES., 140k, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402140KFKED 8 1 R2 RES., 100k, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402100KFKED 9 1 U1 IC, 6A LOW VOLTAGE MONOLITHIC SYNC, LQFN-12(2x2) LINEAR TECH., LTC3309AEV#PBF Additional Demo Board Circuit Components 1 2 C7, C8 CAP., 330F, TANT. POSCAP, 6.3V, 20%, 7343, 25m, TPE PANASONIC, 6TPE330ML 2 1 C9 CAP., 0.1F, X7R, 25V, 10%, 0402, AEC-Q200 MURATA, GCM155R71E104KE02D 3 2 C10, C11 CAP., 10F, X7S, 6.3V, 20%, 0603 TDK, C1608X7S0J106M080AC 4 2 C13, C14 CAP., 1F, X7T, 6.3V, 20%, 0201 MURATA, GRM033D70J105ME01D 5 1 L2 IND., 100 @ 100MHz, FERRITE BEAD, 25%, 8A, 6m, 1812 WURTH ELEKTRONIK, 74279226101 6 1 Q1 XSTR., MOSFET, N-CH, 40V, 30A, PPAK SO-8 VISHAY, SIR426DP-T1-GE3 7 1 R3 RES., 20, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW040220R0FKED 8 1 R5 RES., 10k, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW040210K0JNED 9 1 R6 RES., 1M, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW04021M00FKED 10 1 R7 RES., 249k, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402249KFKED 11 1 R8 RES., 100k, 5%, 1/16W, 0402 YAGEO, RC0402JR-07100KL 12 1 R9 RES., 0, 1/16W, 0402 VISHAY, CRCW04020000Z0ED 13 1 R10 RES., 10k, 5%, 1/10W, 0402, AEC-Q200 PANASONIC, ERJ2GEJ103X 14 1 R11 RES., 0.1, 1%, 2W, 2512, SENSE, AEC-Q200 IRC, LRC-LR2512LF-01-R100-F Hardware: For Demo Board Only 1 10 E1-E3, E5, E12, E14-E16, E19, E21 TEST POINT, TURRET, 0.064" MTG. HOLE, PCB 0.062" THICK MILL-MAX, 2308-2-00-80-00-00-07-0 2 6 E4, E7, E11, E13, E18, E20 TEST POINT, TURRET, 0.094" MTG. HOLE, PCB 0.062" THICK MILL-MAX, 2501-2-00-80-00-00-07-0 3 5 E6, E8-E10, E17 CONN., BANANA JACK, FEMALE, THT, NON-INSULATED, SWAGE, 0.218" KEYSTONE, 575-4 4 1 JP1 CONN., HDR, MALE, 1x4, 2mm, VERT, STR, THT WURTH ELEKTRONIK, 62000411121 5 1 JP2 CONN., HDR, MALE, 1x3, 2mm, VERT, STR, THT WURTH ELEKTRONIK, 62000311121 6 4 MP1-MP4 STANDOFF, NYLON, SNAP-ON, 0.50" WURTH ELEKTRONIK, 702935000 7 0 TP1, TP3 CONN., U.FL, RECEPT, ST SMD, 0Hz to 6GHz 50 HIROSE ELECTRIC, U.FL-R-SMT-1(10) 8 2 XJP1, XJP2 CONN., SHUNT, FEMALE, 2 POS, 2mm WURTH ELEKTRONIK, 60800213421 8 Rev. 0 A B C E15 E12 E11 E9 E6 E4 E3 E17 E18 E2 E1 E21 + VIN C8 330uF C7 330uF + JP1 R5 10k LO JP2 EN HI R6 1M C9 0.1uF 249k R7 74279226101 C11 C10 10uF 10uF 0603 0603 100 OHMS@100MHz L2 OPTIONAL EMI FILTER VIN SG_INPUT 20V MAX Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. 5 R10 10k 5% E19 4 R11 0.1 2W 2512 TP1 VOUT E20 SIR426DP-T1-GE3 Q1 VOUT TP2 ISTEP RSNS OPTIONAL TRANSIENT RESPONSE CIRCUIT EN GND SNSE GND GND 2.25V - 5.5V VIN VIN VIN SNSE 2.25V - 5.5V VIN EMI VIN EMI GND 5.5V MAX MODE/SYNC GND MODE/SYNC BURST FC/SYNC SKIP 5 6 7 8 1 2 3 D 5 EN VIN 4 PCB1 STNCL1 PCB, DC2745A REV06 TOOL, STENCIL, 700-DC2745A REV06 LABEL STANDOFF,NYLON,SNAP-ON,0.50" MP4 LB1 STANDOFF,NYLON,SNAP-ON,0.50" MP3 STANDOFF,NYLON,SNAP-ON,0.50" 2 8 MP2 PCA ADDITIONAL PARTS C14 1uF 0201 C13 1uF 0201 VIN STANDOFF,NYLON,SNAP-ON,0.50" RT R9 0 C3 10uF 0603 C2 10uF 0603 3 MP1 VIN C1 0.01uF 0201 VIN 4 U1 R4 OPT FSW=2MHz RT C6 6.8pF C4 47uF 0805 CUSTOMER NOTICE 1 11 10 L1 0.22uH XFHCL43LT-R22M TPA1 R2 100k R1 140k R3 20 TPB1 APPROVALS C5 47uF 0805 2 3 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SIZE: N/A 2 C16 1uF 0201 C18 OPT 0805 E5 E8 E7 E16 E14 E13 VOUT SNSE 06-11-19 DATE PGOOD GND SNSE GND GND 1.2V 6A VOUT VOUT TP3 C17 OPT E10 VOUT MM DATE: 06-11-19 1 SHEET 1 OF 710-DC2745A_REV06 SCHEMATIC NO. AND REVISION: 1 5V, 6A SYNCHRONOUS STEP-DOWN SILENT SWITCHER www.linear.com Phone: (408)432-1900 TITLE: DEMO CIRCUIT SCHEMATIC, NOTES: UNLESS OTHERWISE SPECIFIED 1. RESISTORS: OHMS, 0402, 1%, 1/16W 2. CAPACITORS: 0402 R8 100k C19 OPT 0805 PRODUCTION www.analog.com C15 1uF 0201 6 1 REVISION HISTORY DESCRIPTION APPROVED PCA BOM: 700-DC2745A_REV07 PCA ASS'Y: 705-DC2745A_REV06 C12 OPT - ECO REV SCALE = NONE DC2745A SKU NO. LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A NC CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; PCB DES. HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO MM APP ENG. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED IC NO. CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR LTC3309A TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. 4 7 13 PGND AGND PGOOD RT VFB 12 9 5 MODE/SYNC SW 6 SW LTC3309A-LQFN 3 A B C D DEMO MANUAL DC2745A SCHEMATIC DIAGRAM Rev. 0 9 DEMO MANUAL DC2745A ESD Caution ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality. 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