Pump Controller PCB Design Overview

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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.

Dispatching Library tool to find: "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.

Dispatching Library tool to find: "47uH Inductor"

Dispatching Library tool to find: "47uH Power Inductor"

Dispatching Library tool to find: "47uH 3A Inductor"

Dispatching Library tool to find: "Shielded 47uH Inductor"

Dispatching Library tool to find: "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
44 days

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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 for rapid developing circuit topology. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard resistor values: 1.0Ω 10Ω 100Ω 1.0kΩ 10kΩ 100kΩ 1.0MΩ 1.1Ω 11Ω 110Ω 1.1kΩ 11kΩ 110kΩ 1.1MΩ 1.2Ω 12Ω 120Ω 1.2kΩ 12kΩ 120kΩ 1.2MΩ 1.3Ω 13Ω 130Ω 1.3kΩ 13kΩ 130kΩ 1.3MΩ 1.5Ω 15Ω 150Ω 1.5kΩ 15kΩ 150kΩ 1.5MΩ 1.6Ω 16Ω 160Ω 1.6kΩ 16kΩ 160kΩ 1.6MΩ 1.8Ω 18Ω 180Ω 1.8KΩ 18kΩ 180kΩ 1.8MΩ 2.0Ω 20Ω 200Ω 2.0kΩ 20kΩ 200kΩ 2.0MΩ 2.2Ω 22Ω 220Ω 2.2kΩ 22kΩ 220kΩ 2.2MΩ 2.4Ω 24Ω 240Ω 2.4kΩ 24kΩ 240kΩ 2.4MΩ 2.7Ω 27Ω 270Ω 2.7kΩ 27kΩ 270kΩ 2.7MΩ 3.0Ω 30Ω 300Ω 3.0KΩ 30KΩ 300KΩ 3.0MΩ 3.3Ω 33Ω 330Ω 3.3kΩ 33kΩ 330kΩ 3.3MΩ 3.6Ω 36Ω 360Ω 3.6kΩ 36kΩ 360kΩ 3.6MΩ 3.9Ω 39Ω 390Ω 3.9kΩ 39kΩ 390kΩ 3.9MΩ 4.3Ω 43Ω 430Ω 4.3kΩ 43KΩ 430KΩ 4.3MΩ 4.7Ω 47Ω 470Ω 4.7kΩ 47kΩ 470kΩ 4.7MΩ 5.1Ω 51Ω 510Ω 5.1kΩ 51kΩ 510kΩ 5.1MΩ 5.6Ω 56Ω 560Ω 5.6kΩ 56kΩ 560kΩ 5.6MΩ 6.2Ω 62Ω 620Ω 6.2kΩ 62KΩ 620KΩ 6.2MΩ 6.8Ω 68Ω 680Ω 6.8kΩ 68kΩ 680kΩ 6.8MΩ 7.5Ω 75Ω 750Ω 7.5kΩ 75kΩ 750kΩ 7.5MΩ 8.2Ω 82Ω 820Ω 8.2kΩ 82kΩ 820kΩ 8.2MΩ 9.1Ω 91Ω 910Ω 9.1kΩ 91kΩ 910kΩ 9.1MΩ #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 10,000uF 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 20pF 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 for rapid developing circuit topology. *You can now change the footprint and 3D model at the top level anytime you want. This is the power of #generics
    jharwinbarrozo
    15.5k
  • 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 thumbnail
2-Layer Pump Controller PCB with MOSFET Driver, Integrated Buck Converter, and ESP32-C3 Footprint (Reference Only; No Connectors)

Properties

mm
mm

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

Assets

Seeed-Studio-XIAO-ESP32-C3.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

Controls