Pump Controller PCB Design Overview

flux

7:57

Looking for "inductor selection guidelines" in 1809050422_XLSEMI-XL1509-5-0E1_C61063.pdf

Looking for "output inductor value 3.3V recommendation" in 1809050422_XLSEMI-XL1509-5-0E1_C61063.pdf

Looking for "switching frequency" in 1809050422_XLSEMI-XL1509-5-0E1_C61063.pdf

Looking for "inductor ripple current equation" in 1809050422_XLSEMI-XL1509-5-0E1_C61063.pdf

Looking for "recommended inductor current rating or saturation current guidance" in 1809050422_XLSEMI-XL1509-5-0E1_C61063.pdf

Looking for "typical application circuit external component selection" in 1809050422_XLSEMI-XL1509-5-0E1_C61063.pdf

Searching for a component.

Searching library for: "47uH shielded power inductor Isat >= 3A Irms >= 2A low DCR SMD 6x6mm to 10x10mm for buck converter at 150 kHz (XL1509-3.3) 2A load; prefer available at Digikey/Mouser"

Creating search plan for: "47uH shielded power inductor Isat >= 3A Irms >= 2A low DCR SMD 6x6mm to 10x10mm for buck converter at 150 kHz (XL1509-3.3) 2A load; prefer available at Digikey/Mouser"

Searching: "47uH shielded power inductor Isat >= 3A Irms >= 2A low DCR SMD 6x6mm to 10x10mm for buck converter at 150 kHz (XL1509-3.3) 2A load; prefer available at Digikey/Mouser"

Found 20 results.

Searching: "47uH shielded power inductor Isat >= 3A Irms >= 2A low DCR SMD 6x6mm to 10x10mm for buck converter at 150 kHz (XL1509-3.3) 2A load; prefer available at Digikey/Mouser"

Searching: "47uH shielded power inductor Isat >= 3A Irms >= 2A low DCR SMD 6x6mm to 10x10mm for buck converter at 150 kHz (XL1509-3.3) 2A load; prefer available at Digikey/Mouser"

Found 16 results.

Searching: "47uH shielded power inductor Isat >= 3A Irms >= 2A low DCR SMD 6x6mm to 10x10mm for buck converter at 150 kHz (XL1509-3.3) 2A load; prefer available at Digikey/Mouser"

Searching.

Found 16 results.

Searching: "47uH shielded power inductor Isat >= 3A Irms >= 2A low DCR SMD 6x6mm to 10x10mm for buck converter at 150 kHz (XL1509-3.3) 2A load; prefer available at Digikey/Mouser"

Finished searching for a component.

Searching for components.

Searching library for: "47uH Inductor"

Searching library for: "47uH Power Inductor"

Searching library for: "47uH 3A Inductor"

Searching library for: "Shielded 47uH Inductor"

Searching library for: "68uH Inductor"

Creating search plan for: "47uH Inductor"

Creating search plan for: "47uH Power Inductor"

Creating search plan for: "47uH 3A Inductor"

Creating search plan for: "Shielded 47uH Inductor"

Creating search plan for: "68uH Inductor"

Searching: "68uH Inductor"

Searching.

Found 20 results.

Searching: "47uH Power Inductor"

Searching.

Found 16 results.

Searching: "47uH 3A Inductor"

Found 20 results.

Searching: "Shielded 47uH Inductor"

Searching.

Found 20 results.

Searching: "47uH Inductor"

Searching.

Found 20 results.

Searching: "68uH Inductor"

Searching.

Found 16 results.

Searching: "47uH 3A Inductor"

Searching.

Found 16 results.

Searching: "47uH 3A Inductor"

Finished searching for components.

Looking for "saturation current and rated current and DCR for CDRH127NP-470MC" in CDRH127.pdf

Looking for "saturation current and rated current and DCR for YSPI1050-680M 68uH" in 2304140030_YJYCOIN-YSPI1050-680M_C497902.pdf

Looking for "saturation current and rated current and DCR for YSPI1365-470M 47uH" in 2409271302_YJYCOIN-YSPI1365-470M_C497913.pdf

Selecting inductor specifications.

Summarizing inductor options.

Here are XL1509-3.3–appropriate inductor suggestions, sized for a 2 A load with adequate saturation headroom, backed by the regulator’s datasheet.
What the XL1509-3.3 datasheet calls for
  • Switching frequency: 150 kHz (typ).
  • Typical 3.3 V application: L1 47 µH/2 A.
  • Table entry (fixed 3.3 V) shows: L1 = 47 µH.
Recommended inductors (47 µH primary, with ≥3 A Isat headroom)
  • Best headroom, shielded
    • YSPI1365-470M — 47 µH; Isat 7.0 A; Irms 5.0 A; DCR max 80 mΩ; SMD 13.8×12.6×6.5 mm. Plenty of margin for 2 A load and good copper loss.
  • Compact, widely used shielded drum core
    • CDRH127NP-470MC — 47 µH; DCR 0.10 Ω max (76 mΩ typ); Isat 3.6 A (4.5 A typ); Irms 3.2 A. Meets the current and saturation needs with moderate DCR.
Alternative (only if you must increase L)
  • YSPI1050-680M — 68 µH; Isat 4.0 A; Irms 3.0 A; DCR typ 240 mΩ (max 300 mΩ); 10×10 mm. Higher DCR; use only if your input conditions push you to a higher L. Verify loop stability if deviating from 47 µH.
Selection notes for your 2 A design
  • Per best practices, operate at no more than 90% of Isat and no more than 60% of Imax (thermal/Irms). The 47 µH parts above clear this easily.
  • The XL1509-3.3’s own examples specify 47 µH for 3.3 V; it’s the right starting point unless a special VIN/ripple target requires otherwise.
  • Favor shielded inductors with low DCR to reduce copper loss and EMI.
Want me to add one of these to your project and wire it into U2 per the datasheet? If yes, pick the part and I’ll place it.
Choose preferred inductor
Go smaller package
Check inductor stress
Confirm BOM caps/diode
Datasheet-based reference
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MTMS
MTDO
GND
MTCK
GPIO21/D6/TX
GPIO7/D5/SCL
GPIO5/A3/D3
VCC_3V3
MTDI
GPIO20/D7/RX
VBUS
GPIO4/A2/D2
GPIO2/A0/D0
PUMP-
EN
GPIO9/D9/MISO
GND
GPIO8/D8/SCK
BAT-
GPIO10/D10/MOSI
GPIO3/A1/D1
BAT+
GPIO6/D4/SDA
PUMP+
J3
Q1 S - GND GND
GND
  • Ground
    Ground
    A common return path for electric current. Commonly known as ground.
    jharwinbarrozo
    20.5M
  • Net Portal
    Net Portal
    Wirelessly connects nets on schematic. Used to organize schematics and separate functional blocks. To wirelessly connect net portals, give them same designator. #portal
    jharwinbarrozo
    43.0M
  • Power Net Portal
    Power Net Portal
    Wirelessly connects power nets on schematic. Identical to the net portal, but with a power symbol. Used to organize schematics and separate functional blocks. To wirelessly connect power net portals, give them the same designator. #portal #power
    jharwinbarrozo
    11.4M
  • Generic Resistor
    Generic Resistor
    A generic fixed resistor ideal for rapid circuit topology development. Its footprint automatically adapts based on the selected package case code—supporting 0402, 0603, 0805, 1203, and many other standard SMD packages, as well as axial horizontal and vertical configurations. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard resistor values: 1.0 ohm, 10 ohm, 100 ohm, 1.0k ohm, 10k ohm, 100k ohm, 1.0M ohm 1.1 ohm, 11 ohm, 110 ohm, 1.1k ohm, 11k ohm, 110k ohm, 1.1M ohm 1.2 ohm, 12 ohm, 120 ohm, 1.2k ohm, 12k ohm, 120k ohm, 1.2M ohm 1.3 ohm, 13 ohm, 130 ohm, 1.3k ohm, 13k ohm, 130k ohm, 1.3M ohm 1.5 ohm, 15 ohm, 150 ohm, 1.5k ohm, 15k ohm, 150k ohm, 1.5M ohm 1.6 ohm, 16 ohm, 160 ohm, 1.6k ohm, 16k ohm, 160k ohm, 1.6M ohm 1.8 ohm, 18 ohm, 180 ohm, 1.8K ohm, 18k ohm, 180k ohm, 1.8M ohm 2.0 ohm, 20 ohm, 200 ohm, 2.0k ohm, 20k ohm, 200k ohm, 2.0M ohm 2.2 ohm, 22 ohm, 220 ohm, 2.2k ohm, 22k ohm, 220k ohm, 2.2M ohm 2.4 ohm, 24 ohm, 240 ohm, 2.4k ohm, 24k ohm, 240k ohm, 2.4M ohm 2.7 ohm, 27 ohm, 270 ohm, 2.7k ohm, 27k ohm, 270k ohm, 2.7M ohm 3.0 ohm, 30 ohm, 300 ohm, 3.0K ohm, 30K ohm, 300K ohm, 3.0M ohm 3.3 ohm, 33 ohm, 330 ohm, 3.3k ohm, 33k ohm, 330k ohm, 3.3M ohm 3.6 ohm, 36 ohm, 360 ohm, 3.6k ohm, 36k ohm, 360k ohm, 3.6M ohm 3.9 ohm, 39 ohm, 390 ohm, 3.9k ohm, 39k ohm, 390k ohm, 3.9M ohm 4.3 ohm, 43 ohm, 430 ohm, 4.3k ohm, 43K ohm, 430K ohm, 4.3M ohm 4.7 ohm, 47 ohm, 470 ohm, 4.7k ohm, 47k ohm, 470k ohm, 4.7M ohm 5.1 ohm, 51 ohm, 510 ohm, 5.1k ohm, 51k ohm, 510k ohm, 5.1M ohm 5.6 ohm, 56 ohm, 560 ohm, 5.6k ohm, 56k ohm, 560k ohm, 5.6M ohm 6.2 ohm, 62 ohm, 620 ohm, 6.2k ohm, 62K ohm, 620K ohm, 6.2M ohm 6.8 ohm, 68 ohm, 680 ohm, 6.8k ohm, 68k ohm, 680k ohm, 6.8M ohm 7.5 ohm, 75 ohm, 750 ohm, 7.5k ohm, 75k ohm, 750k ohm, 7.5M ohm 8.2 ohm, 82 ohm, 820 ohm, 8.2k ohm, 82k ohm, 820k ohm, 8.2M ohm 9.1 ohm, 91 ohm, 910 ohm, 9.1k ohm, 91k ohm, 910k ohm, 9.1M ohm #generics #CommonPartsLibrary
    jharwinbarrozo
    1.5M
  • Generic Capacitor
    Generic Capacitor
    A generic fixed capacitor ideal for rapid circuit topology development. You can choose between polarized and non-polarized types, its symbol and the footprint will automatically adapt based on your selection. Supported options include standard SMD sizes for ceramic capacitors (e.g., 0402, 0603, 0805), SMD sizes for aluminum electrolytic capacitors, and through-hole footprints for polarized capacitors. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard capacitor values: 1.0pF, 10pF, 100pF, 1000pF, 0.01uF, 0.1uF, 1.0uF, 10uF, 100uF, 1000uF, 10000uF 1.1pF, 11pF, 110pF, 1100pF 1.2pF, 12pF, 120pF, 1200pF 1.3pF, 13pF, 130pF, 1300pF 1.5pF, 15pF, 150pF, 1500pF, 0.015uF, 0.15uF, 1.5uF, 15uF, 150uF, 1500uF 1.6pF, 16pF, 160pF, 1600pF 1.8pF, 18pF, 180pF, 1800pF 2.0pF, 20pF, 200pF, 2000pF 2.2pF, 22pF, 220pF, 2200pF, 0.022uF, 0.22uF, 2.2uF, 22uF, 220uF, 2200uF 2.4pF, 24pF, 240pF, 2400pF 2.7pF, 27pF, 270pF, 2700pF 3.0pF, 30pF, 300pF, 3000pF 3.3pF, 33pF, 330pF, 3300pF, 0.033uF, 0.33uF, 3.3uF, 33uF, 330uF, 3300uF 3.6pF, 36pF, 360pF, 3600pF 3.9pF, 39pF, 390pF, 3900pF 4.3pF, 43pF, 430pF, 4300pF 4.7pF, 47pF, 470pF, 4700pF, 0.047uF, 0.47uF, 4.7uF, 47uF, 470uF, 4700uF 5.1pF, 51pF, 510pF, 5100pF 5.6pF, 56pF, 560pF, 5600pF 6.2pF, 62pF, 620pF, 6200pF 6.8pF, 68pF, 680pF, 6800pF, 0.068uF, 0.68uF, 6.8uF, 68uF, 680uF, 6800uF 7.5pF, 75pF, 750pF, 7500pF 8.2pF, 82pF, 820pF, 8200pF 9.1pF, 91pF, 910pF, 9100pF #generics #CommonPartsLibrary
    jharwinbarrozo
    1.5M
  • Generic Inductor
    Generic Inductor
    A generic fixed inductor suitable for rapid circuit topology development. The footprint automatically adapts based on the selected package, supporting standard SMD sizes (e.g., 0402, 0603, 0805) as well as well-known inductor packages such as SDR1806, PA4320, SRN6028, and SRR1260. Standard inductor values: 1.0 nH, 10 nH, 100 nH, 1.0 µH, 10 µH, 100 µH, 1.0 mH 1.2 nH, 12 nH, 120 nH, 1.2 µH, 12 µH, 120 µH, 1.2 mH 1.5 nH, 15 nH, 150 nH, 1.5 µH, 15 µH, 150 µH, 1.5 mH 1.8 nH, 18 nH, 180 nH, 1.8 µH, 18 µH, 180 µH, 1.8 mH 2.2 nH, 22 nH, 220 nH, 2.2 µH, 22 µH, 220 µH, 2.2 mH 2.7 nH, 27 nH, 270 nH, 2.7 µH, 27 µH, 270 µH, 2.7 mH 3.3 nH, 33 nH, 330 nH, 3.3 µH, 33 µH, 330 µH, 3.3 mH 3.9 nH, 39 nH, 390 nH, 3.9 µH, 39 µH, 390 µH, 3.9 mH 4.7 nH, 47 nH, 470 nH, 4.7 µH, 47 µH, 470 µH, 4.7 mH 5.6 nH, 56 nH, 560 nH, 5.6 µH, 56 µH, 560 µH, 5.6 mH 6.8 nH, 68 nH, 680 nH, 6.8 µH, 68 µH, 680 µH, 6.8 mH 8.2 nH, 82 nH, 820 nH, 8.2 µH, 82 µH, 820 µH, 8.2 mH #generics #CommonPartsLibrary
    jharwinbarrozo
    15.8k
  • Terminal
    Terminal
    An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.
    natarius
  • RMCF0805JT47K0
    RMCF0805JT47K0
    47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film #forLedBlink
    jharwinbarrozo
    1.2M
  • 875105359001
    875105359001
    10uF Capacitor Aluminum Polymer 20% 16V SMD 5x5.3mm #forLedBlink #commonpartslibrary #capacitor #aluminumpolymer #radialcan
    jharwinbarrozo
    1.2M
  • CTL1206FYW1T
    CTL1206FYW1T
    Yellow 595nm LED Indication - Discrete 1.7V 1206 (3216 Metric) #forLedBlink
    jharwinbarrozo
    1.1M

Seeed Studio XIAO ESP32C3 SMD Version

Seeed Studio XIAO ESP32C3 SMD Version thumbnail
2-Layer Pump Controller PCB with MOSFET Driver, Integrated Buck Converter, and ESP32-C3 Footprint (Reference Only; No Connectors)

Properties

50

mm

2

{Pump: 1.0 mm, Signal: 0.25 mm}

graph LR subgraph Control ESP32[XIAO ESP32-C3] --> R100[100 Ω gate resistor] --> Q1[IRLR7843 MOSFET] --> Pump[Pump] end subgraph Power BatteryJST[Batt JST IN +] --> Pump USBCPower[USB-C VBUS] --> ESP32 end

Both layers

U

30

mm

113991054

Module

Microcontroller

seeedstudio.com/Seeed-XIAO-ESP32C3-p-5431.html

Seeed Studio

files.seeedstudio.com/wiki/XIAO_WiFi/Resources/esp32-c3_datasheet.pdf

Pricing & Availability

Distributor

Qty 1

Arrow

$0.69–$0.85

Digi-Key

$5.88–$7.93

LCSC

$14.76–$15.27

Mouser

$6.71–$6.77

TME

$1.77

Verical

$5.48–$7.14

Controls