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
87 days
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Documents

    Documents are markdown text files which describe project goals, capture details, or even simulation outputs.

    Assets

    step

    Seeed-Studio-XIAO-ESP32-C3.step

    3D_Seeed-Studio-XIAO-ESP32-C33D Model
    XIAO-ESP32-C3-SMD

    XIAO-ESP32-C3-SMD

    XIAO-ESP32-C3-SMD XIAO-ESP32-C3-SMD_2_0 Symbol.svg
    kicad_mod

    XIAO-ESP32C3-SMD.kicad_mod

    FOOTPRINT_XIAO-ESP32C3-SMDFootprint
    esp32c3-smd.png

    esp32c3-smd.png

    esp32c3-smdThumbnail
    XIAO-ESP32-C3-SMD

    XIAO-ESP32-C3-SMD

    XIAO-ESP32-C3-SMD XIAO-ESP32-C3-SMD_1_0 Symbol.svg

    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