docs/voltage-circuit-export-from-ti-webench.pdf — Oasis datasheet

1 TEXAS INSTRUMENTS

WEBENCH © Design Report

Design : 41 LMR54406DBVR LMR54406DBVR 16V-20V to 3.30V @ 0.5A

Cinx 100.0 nF 20.6 mohm

Electrical BOM

LMR54406DBV vin sw

100.0 nF 1.0 mohm

VinMin =16.0V VinMax =20.0V Vout = 3.3V lout =0.5A

Ll Choot Bown 100.0 mohm vn.

Device =LMR54406DBVR Topology = Buck

Created = 2023-10-26 16:47:26.823 BOM Cost = $0.58

BOM Count =11

Total Pd =0.24W

Vout = 3.3V lout = 0.54

Name Manufacturer Part Number Properties Qty Price Footprint Cboot MuRata GRM155R71C104KA88D Cap= 100.0 nF 1 0.01 = Series=X7R ESR=1.0 mOhm 0402 3 mm VDC=16.0V IRMS=0.0A Cin TDK C1608X7R1V105K080AC Cap=1.0 uF 3 0.05 om Series=X7R ESR=5.522 mOhm 0603 5 mm? VDC=35.0V IRMS=2.2162A Cinx MuRata GRM188R71H104KA93D Cap= 100.0 nF 1 0.02 7 Series=X7R ESR=20.0 mOhm 0603 5 mm? VDC=50.0V IRMS=3.8A Cout Kemet C0805C106K8PACTU Cap= 10.0 uF 2 0.03 | Series=X5R ESR=3.0 mOhm 0805 7 mm VDC=10.0V IRMS=11.43A L1 NIC Components NPI54C120MTRF L=12.0 WH 1 0.09 100.0 mOhm IND_NPI54C 61 mm? R fbb Vishay-Dale CRCW040222K1FKED Res= 22.1 kOhm 1 0.01 «= Series=CRCW..e3 Power= 63.0 mW 0402 3 mm Tolerance= 1.0% R ft Vishay-Dale CRCW040269K8FKED Res=69.8 kOhm 1 0.01 = Series=CRCW..e3 Power= 63.0 mW 0402 3 mm Tolerance= 1.0% U1 Texas Instruments LMR54406DBVR Switcher 1 0.23

DBVO0006A 15 mm?

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WEBENCH*® Design Report LMR54406DBVR : LMR54406DBVR 16V-20V to 3.30V @ 0.5A_ February 11, 2025 13:01:40 GMT-06:00

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WEBENCH?® Design

Cinx Pd Ic Tj 0.00000300 + 7 48 7 = 0.00000275 0.00000250 0.00000225 —~ 0.00000200 5 0.00000175 3 0.00000150 x € 0.00000125 ¥ 0.00000100 0.00000075 0.00000050 0.00000025 000000000 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 Output Current (A) Output Current (A) Vin=16.0V —Vin=18.0V ~Vin=20.0V +Vin=16.0V —Vin=18.0V~Vin=20.0V Duty Cycle Cin IRMS 22 a 4. 4 0.20 + + + 21 0.19 20 0.18 19 0.17 18 0.16 Su 35 £16 qos o ~— 0.13 @is a v 0.12 = pia 0.11 V 13 a > 0.10 4 22 E 0.09 11 [s) a 0.08 10 0.07 9 0.06 8 0.05 7 0.04 6 i i i i i 4 i i + 0.03 5 ie A b ie A 0.02 ‘ z H s H J L . L L 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 Output Current (A) Output Current (A) =Vin=16.0V —Vin=18.0V ~Vin=20.0V Vin=16.0V —Vin=18.0V ~—-Vin=20.0V IC Ipk L Pd 0.0250 0.0225 0.0200 0.0175 = 0.0150 3 a 0.0125 + 0.0100 0.0075 0.0050 0.250 |---* . 4 i L 4 4 4 i 0.0025 0.225 - - - - = : 0.0000 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0.05 0.10 «0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50

Output Current (A) =Vin=16.0V—=Vin=18.0V =Vin=20.0V

Output Current (A) = Vin=16.0V =Vin=18.0V—=Vin=20.0V

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WEBENCH*® Design Report LMR54406DBVR : LMR54406DBVR 16V-20V to 3.30V @ 0.5A_ February 11, 2025 13:01:40 GMT-06:00

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WEBENCH?® Design

Efficiency 90 H £ H 0.0475 89 0.0450 38 0.0425 87 0.0400 0.0375 s 86 Sas 0.0350 > = 0.0325 5 84 0.0300 2 83 3 ig 0.0275 ip 82 S 0.0250 Wi gi 0.0225 80 0.0200 79 0.0175 78 : b L Hy 4 0.0150 7 , , , / , 1 0.0125 + 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0.05 0.10 «(0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 Output Current (A) Output Current (A) Vin=16.0V —Vin=18.0V ~Vin=20.0V +Vin=16.0V —Vin=18.0V~Vin=20.0V Vout p-p Cin Pd 0.000075 0.0075 0.000070 9.0070 0.000065 0.0065 0.000060 0.0060 0.000055 — 0.0055 0.000050 5 0.0050 = 0.000045 § 0.0045 3 0.000040 ¥ 0.0040 7200035 g 0.0035 G 2000030 0.0030 0.000025 . 0.000020 9.0025 0.000015 0.0020 0.000010 0.0015 0.000005 0.0010 ~ = — — = 0.000000 0.05 0,10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 Output Current (A) Output Current (A) =Vin=16.0V —Vin=18.0V ~Vin=20.0V Vin=16.0V —Vin=18.0V ~—-Vin=20.0V Cout Pd Ipp percentage 550 : - - : = 0.0000115 0.000110 500 0.0000105 450 0.0000100 > 3S 400 _. 9-0000095 7 = 0.0000090 a 350 B 0.0000085 © 300 a qs 00000080 8 250 3 00000075 o U 0,0000070 2 200 0.0000065 2450 0.0000060 ~ 100 0.0000055 0.0000050 50 0.0000045 |---. : z 2 i ‘ L L ° 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50

Output Current (A) =Vin=16.0V—=Vin=18.0V =Vin=20.0V

Output Current (A) = Vin=16.0V =Vin=18.0V—=Vin=20.0V

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WEBENCH*® Design Report LMR54406DBVR : LMR54406DBVR 16V-20V to 3.30V @ 0.5A_ February 11, 2025 13:01:40 GMT-06:00

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WEBENCH?® Design

lin Avg 17 1.6 0.11 15 La 0.10 1.3 0.09 1.2 i 0:08 = 1.0 Lo07 Da pos > 0.06 308 < O07 ¢ 0.05 0.6 ~ 0.04 0.5 0.4 0.03 0.3 0.02 ot 0.01 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 Output Current (A) Output Current (A) Vin=16.0V —Vin=18.0V ~Vin=20.0V +Vin=16.0V —Vin=18.0V~Vin=20.0V Cinx IRMS Total Pd 0.012 9.250 i i i 0.011 0.225 0.010 0.200 z 0.009 ~ 0-175 un 0.008 é 0.150 = 0.007 a « — 0,125 % 0.006 £ = ‘© 0.100 © 0.005 La 0.075 0.004 0.003 0.050 0.002 0.025 0.05 0,10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0,45 0.50 Output Current (A) Output Current (A) =Vin=16.0V —Vin=18.0V ~Vin=20.0V Vin=16.0V —Vin=18.0V ~—-Vin=20.0V Cout IRMS Lipp 0.0875 0.265 0.0850 0.260 0.0825 0.255 0.0800 0.250 J 0.0775 0.245 ~— — 0.24 W 0.0750 oe ~— 0.235 0.0725 « @ 0.230 3 9.0700 J 0.225 8 0.0675 0.220 0.0650 0.215 0.0625 0.210 0.0600 0.205 0.0575 0.200 0.195

0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 Output Current (A) =Vin=16.0V—=Vin=18.0V =Vin=20.0V

0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 Output Current (A) = Vin=16.0V =Vin=18.0V—=Vin=20.0V

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WEBENCH*® Design Report LMR54406DBVR : LMR54406DBVR 16V-20V to 3.30V @ 0.5A_ February 11, 2025 13:01:40 GMT-06:00

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WEBENCH® Design

Ic Pd

0.225 Loop Response 70 0.200 60 175 50 150 0.175 40 125 z 30 100 08° ~ 2° 75 o 5 0.125 @ 10 so + 2 Zo b a ra 25 0 9.100 ‘gu 0 2 - © -20 Q 0.075 -30 25 a -40 50 5 0.050 -50 725 ®@ -60 -100 0.025 70 i Hl H “125 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 10 1,000 100,000 Output Current (A) Frequency (Hz) =Vin=16.0V —Vin=18.0V ~Vin=20.0V ~Gain—Phase + 180 Efficiency (Log-Scale) 90.0 + + + 87.5 85.0 82.5 ZS 80.0 D775 5 75.0 2725 = WW 70.0 67.5 65.0 62.5 60.0 L : : - “ “ 1E-3 3.16E-3 1E-2 3.16E-2 1E-1 3.16E-1 Output Current (A) =Vin=16.0V —Vin=18.0V ~Vin=20.0V Operating Values # Name Value Category Description 1. Cin IRMS 179.501 mA Capacitor Input capacitor RMS ripple current 2. Cin Pd 59.307 pW Capacitor Input capacitor power dissipation 3. Cinx IRMS 12.017 mA Capacitor Bulk capacitor RMS ripple current 4. Cinx Pd 2.888 LW Capacitor Bulk capacitor power dissipation 5. CoutIRMS 62.643 mA Capacitor Output capacitor RMS ripple current 6. CoutPd 5.886 UW Capacitor Output capacitor power dissipation 7. IC Ipk 608.501 mA IC Peak switch current in IC 8. IC Pd 217.94 mw IC IC power dissipation 9. IC Tj 47.436 degC IC IC junction temperature 10. IC Tolerance 20.0 mV IC IC Feedback Tolerance 11. ICThetajA Effective 80.0 degC/W IC Effective IC J unction-to-Ambient Thermal Resistance 12. lin Avg 94.676 mA IC Average input current 13. Ipp percentage 43.4% Inductor Inductor ripple current percentage (with respect to average inductor current) 14. Lipp 217.0 mA Inductor Peak-to-peak inductor ripple current 15. LPd 25.392 mW Inductor Inductor power dissipation 16. CinPd 59.307 pW Power Input capacitor power dissipation 17. Cinx Pd 2.888 LW Power Bulk capacitor power dissipation 18. CoutPd 5.886 UW Power Output capacitor power dissipation 19. IC Pd 217.94 mw Power IC power dissipation 20. LPd 25.392 mW Power Inductor power dissipation 21. Total Pd 243.526 mW Power Total Power Dissipation 22. BOM Count 11 System Total Design BOM count Information 23. Cross Freq 25.441 kHz System Bode plot crossover frequency Information 24. Duty Cycle 17.439 % System Duty cycle Information 25. Efficiency 87.139 % System Steady state efficiency Information 26. FootPrint 117.0 mm? System Total Foot Print Area of BOM components Information Copyright © 2025, Texas Instruments Incorporated 5 ti.com/webench

WEBENCH*® Design Report LMR54406DBVR : LMR54406DBVR 16V-20V to 3.30V @ 0.5A_ February 11, 2025 13:01:40 GMT-06:00

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WEBENCH® Design

# Name Value Category Description 27. Frequency 1.1 MHz System Switching frequency Information 28. Gain Marg -19.807 dB System Bode Plot Gain Margin Information 29. lout 500.0 mA System lout operating point Information 30. Low Freq Gain 64.22 dB System Gain at 1Hz Information 31. Mode CCM System Conduction Mode Information 32. Phase Marg 61.65 deg System Bode Plot Phase Margin Information 33. Pout 1.65 W System Total output power Information 34. TotalBOM $0.58 System Total BOM Cost Information 35. Vin 20.0V System Vin operating point Information 36. Vin p-p 46.939 mV System P eak-to-peak input voltage Information 37. Vout 3.3V System Operational Output Voltage Information 38. Vout Actual 3.327V System Vout Actual calculated based on selected voltage divider resistors Information 39. Vout Tolerance 4.073 % System Vout Tolerance based on IC Tolerance (no load) and voltage divider Information resistors if applicable 40. Vout p-p 1.677 mV System Peak-to-peak output ripple voltage Information Design Inputs Name Value Description lout 500.0 m Maximum Output Current VinMax 20.0 Maximum input voltage VinMin 16.0 Minimum input voltage VinTyp 18.0 Typical input voltage Vout 3.3 Output Voltage base_pn LMR54406 Base Product Number source DC Input Source Type Ta 30.0 Ambient temperature Copyright © 2025, Texas Instruments Incorporated 6 ti.com/webench

WEBENCH*® Design Report LMR54406DBVR : LMR54406DBVR 16V-20V to 3.30V @ 0.5A_ February 11, 2025 13:01:40 GMT-06:00

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WEBENCH® Design

WEBENCH® Assembly

Component Testing

Some published data on components in datasheets such as Capacitor ESR and Inductor DC resistance is based on conservative values that will guarantee that the components always exceed the specification. For design purposes it is usually better to work with typical values. Since this data is not always available it is a good practice to measure the Capacitance and ESR values of Cin and Cout, and the inductance and DC resistance of L1 before assembly of the board. Any large discrepancies in values should be electrically simulated in WEBENCH to check for instabilities and thermally simulated in WebTHERM to make sure critical temperatures are not exceeded.

Soldering Component to Board

If board assembly is done in house it is best to tack down one terminal of a component on the board then solder the other terminal. For surface mount parts with large tabs, such as the DPAK, the tab on the back of the package should be pre-tinned with solder, then tacked into place

by one of the pins. To solder the tab town to the board place the iron down on the board while resting against the tab, heating both surfaces simultaneously. Apply light pressure to the top of the plastic case until the solder flows around the part and the partis flush with the PCB. If the solder is not flowing around the board you may need a higher wattage iron (generally 25W to 30W is enough).

Initial Startup of Circuit

It is best to initially power up the board by setting the input supply voltage to the lowest operating input voltage 16.0V and set the input supply's current limit to zero. With the input supply off connect up the input supply to Vin and GND. Connect a digital volt meter and a load if needed

to set the minimum lout of the design from Vout and GND. Turn on the input supply and slowly turn up the current limit on the input supply.

If the voltage starts to rise on the input supply continue increasing the input supply current limit while watching the output voltage. If the current increases on the input supply, but the voltage remains near zero, then there may be a short or a component misplaced on the board. Power down the board and visually inspect for solder bridges and recheck the diode and capacitor polarities. Once the power supply circuit is operational then more extensive testing may include full load testing, transient load and line tests to compare with simulation results.

Load Testing

The setup is the same as the initial startup, except that an additional digital voltmeter is connected between Vin and GND, a load is connected between Vout and GND and a current meter is connected in series between Vout and the load. The load must be able to handle at least rated output power +50% ( 7.5 watts for this design). Ideally the load is supplied in the form of a variable load test unit. It can also be done in the form of suitably large power resistors. When using an oscilloscope to measure waveforms on the prototype board, the ground leads of the oscilloscope probes should be as short as possible and the area of the loop formed by the ground lead should be kept to a minimum. This will help reduce ground lead inductance and eliminate EMI noise that is not actually present in the circuit.

Current Probe

Design Assistance 1. Master key : FC2298CE6F 700CFB[v1] 2. LMR54406 Product Folder : http://www.ti.com/product/LMR 54406 : contains the data sheet and other resources.

WEBENCH*® Design Report LMR54406DBVR : LMR54406DBVR 16V-20V to 3.30V @ 0.5A_ February 11, 2025 13:01:40 GMT-06:00

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WEBENCH® Design

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WEBENCH*® Design Report LMR54406DBVR : LMR54406DBVR 16V-20V to 3.30V @ 0.5A_ February 11, 2025 13:01:40 GMT-06:00

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