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Q1
Manufacturer Part Number
LMR16030SDDAR
for COUT1 and 2 can I use a T495X477K010ATE100
ril3y

ril3y

@copilot for COUT1 and 2 can I use a T495X477K010ATE100
2y

copilot

The T495X477K010ATE100 is a tantalum capacitor from Kemet. It has a capacitance of 470uF, a voltage rating of 10V, and is packaged in a SMD_2917 case.
The capacitors COUT1 and COUT2 in your design are specified as 100uF capacitors. Therefore, the T495X477K010ATE100 with its 470uF capacitance is not a direct replacement for these capacitors.
Additionally, it's important to ensure that the voltage rating of the replacement capacitor is sufficient for your circuit. The T495X477K010ATE100 has a voltage rating of 10V. If your circuit requires a higher voltage, this capacitor would not be suitable.
Finally, the physical size and footprint of the capacitor need to be compatible with your PCB layout. The T495X477K010ATE100 is in a SMD_2917 package, so you would need to check if this footprint is compatible with your design.
So, while the T495X477K010ATE100 is a high-quality capacitor, it might not be suitable for your specific needs based on the provided information. Always double-check the specs and requirements of your design before making a part substitution.
2y
ril3y

ril3y

right but they would work, they just have a higher capaciance?
2y

copilot

Yes, using a capacitor with a higher capacitance than originally specified can often work, but it may also impact the performance of your circuit.
For the LMR16030SDDAR regulator circuit, the output capacitors (COUT1 and COUT2 in your design) play a key role in maintaining the stability of the output voltage. While a higher capacitance could potentially provide better voltage stability, it could also lead to issues such as:
  • Slower response to changes in load current.
  • Potentially higher inrush current at startup.
  • Depending on the ESR (Equivalent Series Resistance) of the capacitor, it could impact the stability of the regulator.
Also, the physical size and the voltage rating are also important considerations. The T495X477K010ATE100 capacitor has a 10V rating, which may not be sufficient depending on the input voltage to your regulator.
So while it might work, it's important to consider these factors and potentially simulate the circuit behavior with the new capacitor value to ensure that it meets your specific requirements.
2y
ril3y

ril3y

could this work instead C4532X6S0J107MT000N
2y

copilot

The C4532X6S0J107MT000N is a ceramic capacitor from TDK Corporation. It has a capacitance of 100uF, a voltage rating of 6.3V, and is packaged in a SMD_1812 case.
The capacitors COUT1 and COUT2 in your design are specified as 100uF capacitors, so the capacitance of the C4532X6S0J107MT000N matches your design specification.
However, you should consider the following points:
  1. Voltage Rating: The C4532X6S0J107MT000N has a voltage rating of 6.3V. Ensure that this is sufficient for your circuit. If your circuit requires a higher voltage, this capacitor would not be suitable.
  2. Package Size: The C4532X6S0J107MT000N comes in a SMD_1812 package. Ensure that this footprint is compatible with your PCB layout.
  3. Ceramic vs Electrolytic: The C4532X6S0J107MT000N is a ceramic capacitor, whereas the original capacitors in your design are not specified. Ceramic capacitors have different characteristics compared to electrolytic capacitors (such as ESR and ESL), which can affect the performance of the circuit.
Always double-check the specs and requirements of your design before making a part substitution. It's also a good idea to simulate the circuit behavior with the new capacitor value to ensure that it meets your specific requirements.
2y
ril3y

ril3y

The design sheet for this buck suggested GRM32EC80J107ME20L which i think the C4532X6S0J107MT000N is a decent replacement? Do you agree?
2y

copilot

Yes, the C4532X6S0J107MT000N from TDK Corporation is a good replacement for the GRM32EC80J107ME20L from Murata.
Here's why:
  1. Capacitance: Both capacitors have the same capacitance value of 100uF.
  2. Voltage Rating: Both capacitors have the same voltage rating of 6.3V.
  3. Dielectric Material: Both capacitors use X6S dielectric material, so they have similar temperature stability and loss characteristics.
  4. Size: Both capacitors come in a similar package size (1812 SMD), so the footprint should match.
As always, it's crucial to double-check the datasheets to ensure compatibility, especially if there are specific performance or reliability requirements in your design.
2y
if I wanted to enable or disable this buck converter how would I do this with th...
ril3y

ril3y

@copilot if I wanted to enable or disable this buck converter how would I do this with the EN pin?
2y

copilot

The EN (Enable) pin of the LMR16030SDDAR buck converter is used to turn the device on or off. Here's how you can control it:
  • To enable the buck converter (i.e., to turn it on), apply a voltage that is higher than the enable threshold voltage (V_EN) to the EN pin. According to the LMR16030SDDAR datasheet, the typical V_EN is 1.2V. So, you should apply a voltage higher than this.
  • To disable the buck converter (i.e., to turn it off), apply a voltage that is lower than the enable threshold voltage (V_EN) to the EN pin.
Please note, the voltage applied to the EN pin should not exceed the maximum rating specified in the datasheet. Also, if the EN pin is left open, the device may be in an undefined state. It is recommended that the EN pin be terminated, even if it is not being used to control the device.
2y
ril3y

ril3y

how much current does this pin sink? I am trying to figure out if I can turn it on via a GPIO on my microcontroller
2y

copilot

The Enable (EN) pin of the LMR16030SDDAR buck converter is a high-impedance digital input. The datasheet does not directly provide the current requirement for this pin. However, it is typically in the range of microamperes (µA) or less for such devices, which is within the sourcing/sinking capability of most microcontrollers' GPIO pins.
To be sure, you should consult the datasheet of the specific microcontroller you are using to verify that its GPIO pins can handle the control voltage and current requirements for the EN pin of LMR16030SDDAR.
However, in general practice, it should be safe to control the EN pin directly from a GPIO. For additional safety, you could add a series resistor (e.g., 1kΩ) between the GPIO pin and the EN pin to limit the current.
2y
ril3y

ril3y

so if I used a gpio and made that pin LOW it would be off. Can I have it normally on and then only the microcontroller could turn it off? Would I need a pullup resistor for this to work?
2y

copilot

Yes, you can certainly set up the circuit in this way. Here's how you can do it:
  1. Connect a pull-up resistor from the EN pin to the input voltage source. This will default the EN pin to a HIGH state, and the buck converter will be normally on.
  2. Connect the GPIO pin of the microcontroller to the EN pin. When you want to turn the buck converter off, make the GPIO pin output a LOW signal. This will pull the EN pin to a LOW state, turning the buck converter off.
The value of the pull-up resistor should be chosen such that it does not draw too much current from the power source when the GPIO is LOW. A common choice for the pull-up resistor value is between 10kΩ and 100kΩ.
Remember to ensure that the voltage level of the HIGH state of your microcontroller's GPIO pin is compatible with the voltage level expected by the EN pin of the buck converter.
Also, the GPIO pin should be set to output a LOW signal for off state, and should be set to high-impedance (input) state for on state. This way, when the GPIO is in high-impedance state, the pull-up resistor can pull the EN pin high and turn on the buck converter.
2y
ril3y

ril3y

the microcontroller is 3v3 and the input voltage is much higher. do you have an idea of how to accomplish what we talked about above with this new data?
2y

copilot

You can use a voltage divider to ensure that the voltage at the EN pin does not exceed the maximum allowable voltage for this pin. A voltage divider consists of two resistors. Here's how you can do it:
  1. Connect one resistor (R1) from the input voltage source to the EN pin.
  2. Then, connect a second resistor (R2) from the EN pin to the GPIO pin and to ground.
This arrangement will ensure that the voltage at the EN pin will be reduced to a safe level for the microcontroller when the GPIO pin is HIGH.
Here's how to calculate the resistor values:
The voltage at the EN pin (V_EN) can be calculated by the voltage divider rule:
V_EN = V_IN * (R2 / (R1 + R2))
Let's assume that you want to keep V_EN to be 3.3V when the GPIO is HIGH, and V_IN is higher than 3.3V (let's say 5V for this calculation).
If we choose R1 to be 10kΩ, we can rearrange the formula to solve for R2:
R2 = R1 * (V_EN / (V_IN - V_EN)) = 10kΩ * (3.3V / (5V - 3.3V)) = 10kΩ * 1.94 = 19.4kΩ
You can round R2 to the nearest standard resistor value, which would be 20kΩ.
Please note that these calculations are based on an assumed V_IN of 5V. If your V_IN is different, you should adjust the calculations accordingly. Also, this setup assumes that the GPIO pin is capable of sinking the current through the voltage divider when it goes LOW. Please ensure that your microcontroller's GPIO pin can handle this.
2y
5
can you recommend an alternative part for SBRD10200TR
ril3y

ril3y

@copilot can you recommend an alternative part for SBRD10200TR
2y

copilot

The SBRD10200TR is a Schottky diode from Diodes Incorporated with the following specifications:
  • Rectifier Type: Schottky
  • Voltage - DC Reverse (Vr) (Max): 200V
  • Current - Average Rectified (Io): 10A
  • Voltage - Forward (Vf) (Max) @ If: 0.98V @ 10A
  • Speed: Fast Recovery =< 500ns, > 200mA (Io)
  • Reverse Recovery Time (trr): -
  • Current - Reverse Leakage @ Vr: 500µA @ 200V
  • Capacitance @ Vr, F: -
  • Mounting Type: Surface Mount
  • Package / Case: TO-252-3, DPak (2 Leads + Tab), SC-63
Here are a few alternative parts that are similar:
  1. STPS20H100CT from STMicroelectronics: This is a 100V, 10A dual Schottky rectifier in a TO-220-3 package. Datasheet
  2. MBR20100CT from ON Semiconductor: This is a 100V, 20A dual Schottky rectifier in a TO-220-3 package. Datasheet
  3. MBRS10100CT from Fairchild/ON Semiconductor: This is a 100V, 10A dual Schottky rectifier in a TO-252-3, DPak (2 Leads + Tab), SC-63 package. Datasheet
Please note that while these alternatives have similar specifications, they may not be exact matches. Always verify the specifications and package compatibility of the alternative part with your circuit requirements before making a replacement.
2y
ril3y

ril3y

is there any in a smaller package?
2y

copilot

Sure, you can find similar Schottky diodes in smaller packages. Here are a few alternatives:
  1. PMGD290UN,115 from Nexperia USA Inc.: This is a 90V, 1A dual Schottky diode in a 6-TSSOP, SC-88, SOT-363 package. Datasheet
  2. BAS21HT,115 from Nexperia USA Inc.: This is a 200V, 0.2A dual Schottky diode in a 3-SOT-23 package. Datasheet
  3. BAT54CWT1G from ON Semiconductor: This is a 30V, 0.2A dual Schottky diode in a SC-70, SOT-323 package. Datasheet
Please note that these alternatives have smaller packages, but they also have different specifications. Always ensure that the replacement part meets your circuit's voltage, current, and speed requirements before making a replacement.
2y
ril3y

ril3y

it needs to be at least 4A
2y

copilot

I understand your requirement. Here are a few Schottky diodes in smaller packages which can handle at least 4A of current:
  1. PMDS10S120 from Nexperia: This is a 120V, 4.6A single Schottky diode in a 4-DFN package. Datasheet
  2. RB160VM-40TR from Rohm Semiconductor: This is a 40V, 4A single Schottky diode in a PMDU package. Datasheet
  3. SK54C-TP from Micro Commercial Co: This is a 40V, 5A single Schottky diode in a DO-214AB, SMC package. Datasheet
Please make sure to verify that the voltage rating and package of the chosen diode fit your application.
2y
ril3y

ril3y

it needs to be similar specs to SBRD10200TR and smaller
2y

copilot

Understood! Here are a few Schottky diodes with similar specifications to the SBRD10200TR but in smaller packages:
  1. VS-8TQ100SPBF from Vishay: This is a 100V, 8A single Schottky diode in a TO-277, 3-PowerVDFN package which is smaller than the original TO-252-3, DPak. Datasheet
  2. MBR1045CT-E3/45 from Vishay: This is a 45V, 10A dual Schottky diode in a TO-262-3 Long Leads, I²Pak, TO-262AA package, which is a bit smaller than the TO-252-3, DPak. Datasheet
  3. MBRD1045T4G from ON Semiconductor: This is a 45V, 10A dual Schottky diode in a smaller TO-252-3, DPak (2 Leads + Tab), SC-63 package. Datasheet
Please verify the specifications and package compatibility of the alternative part with your circuit requirements before making a replacement.
2y
ril3y

ril3y

VS-8TQ100SPBF is there a smd version of this?
2y

copilot

Yes, the VS-8TQ100SPBF from Vishay itself is an SMD (Surface Mount Device) component. It comes in a TO-277, 3-PowerVDFN package which is designed for surface mount applications.
Here is its Datasheet for more detailed information.
Please verify the package dimensions to make sure it fits in your design.
2y
ril3y

ril3y

STPS20H100CT is there a smd version o fthis?
2y

copilot

Yes, there is an SMD version of the STPS20H100CT. It's the STPS20H100CFP, which comes in the TO-220FP (Fully Plastic) package. This is a surface-mount variant of the TO-220 package.
Here is the Datasheet for more detailed information.
Please verify if the TO-220FP package fits your design requirements.
2y
ril3y

ril3y

would a SS510 be ok for D1?
2y

copilot

The SS510 is a Schottky Barrier Rectifier from Fairchild Semiconductor with the following specifications:
  • Rectifier Type: Schottky
  • Voltage - DC Reverse (Vr) (Max): 100V
  • Current - Average Rectified (Io): 5A
  • Voltage - Forward (Vf) (Max) @ If: 0.85V @ 5A
  • Speed: Fast Recovery =< 500ns, > 200mA (Io)
  • Reverse Recovery Time (trr): -
  • Current - Reverse Leakage @ Vr: 500µA @ 100V
  • Capacitance @ Vr, F: -
  • Mounting Type: Surface Mount
  • Package / Case: DO-214AA, SMB
Comparing this to the SBRD10200TR:
  • Rectifier Type: Schottky
  • Voltage - DC Reverse (Vr) (Max): 200V
  • Current - Average Rectified (Io): 10A
  • Voltage - Forward (Vf) (Max) @ If: 0.98V @ 10A
  • Speed: Fast Recovery =< 500ns, > 200mA (Io)
  • Reverse Recovery Time (trr): -
  • Current - Reverse Leakage @ Vr: 500µA @ 200V
  • Capacitance @ Vr, F: -
  • Mounting Type: Surface Mount
  • Package / Case: TO-252-3, DPak (2 Leads + Tab), SC-63
We see that the SS510 has a lower reverse voltage (100V vs 200V) and a lower average rectified current (5A vs 10A).
If your circuit does not require the higher reverse voltage and current handling capability of the SBRD10200TR, the SS510 could potentially work as a replacement. However, without knowing more about your specific application, it's impossible to say for sure. Always verify the specifications of the replacement part against the requirements of your circuit before making a substitution.
2y
ril3y

ril3y

i am not sure why this buck converter recommends so high voltages for D1. The max input is 56v and max output current is 3A.
2y

copilot

The diode in a buck converter experiences reverse voltage approximately equal to the input voltage. The specified maximum input voltage for LMR16030SDDAR is 60V, hence a diode with a reverse voltage specification above this value (e.g., 100V or 200V) is recommended to provide a safety margin.
The forward current specification of the diode should be at least equal to the maximum output current of the converter. In your case, a diode rated for more than 3A should be suitable.
Moreover, peak currents during transient conditions can be higher than the average output current. Therefore, it's always safe to choose components with ratings that provide sufficient margin above the maximum expected operating conditions.
In light of this, the SS510 with 100V reverse voltage and 5A forward current should be adequate for your application. However, it would be prudent to validate this with actual load and input conditions.
2y
2
PGND
PROJECT_ID: 10
Line 1
This is to keep track of my BOM
CIN2
Capacitance
3.3u F
VINPUT
FB
Cff
Capacitance
470p F
Cboot
Capacitance
100n F
VINPUT
Rt
Resistance
37.4k Ω
PGND
CIN1
Capacitance
3.3u F
VINPUT
L1
Not Recommended for New Designs
Inductance
4.7u H
Css
Capacitance
15n F
D2
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LMR16030SDDAR sublayout

LMR16030SDDAR sublayout
Description

Created
Last updated by ril3y
3 Contributor(s)
ril3y
giulioz
vasy_skral

Controls

Properties

Designator Prefix
SUBLAYOUT

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