USB Multi-Rail LDO Design

flux

0:00

Work done
  • Built the multi-rail LDO schematic blocks and nets: J1 as 2-pin +5V input, U1 TLV70033, U2 TLV70018, and 1 uF input/output caps C1 - C6 wired to +5V_USB / rails / GND.
  • Labeled rails as +5V_USB, +3V3, +1V8, +1V1, and GND.
Success criteria review
  • ✅ Includes the 2-pin power connector, two TLV700xx regulators, and 1 uF input/output capacitors per regulator.
  • ✅ All required nets are labeled (+5V_USB, +3V3, +1V8, +1V1, GND).
  • ❌ Cannot place the required TLV70011 SOT-23-5 as U3: the library search for "TLV70011" returns only TLV7011 comparator variants, not the TLV70011 LDO.
Next steps I can finish this as soon as we have a valid TLV70011 LDO part in the library (or you provide a specific part UID/MPN that exists there). Want me to:
  • Use an approved alternative 1.1 V fixed SOT-23-5 LDO you choose, or
  • Keep the schematic as-is and wait until TLV70011 becomes available?
82 days
joshdopp

joshdopp

you you do the pcb layout and routing?
82 days

flux

1:26

Clarifying capabilities and actions.

Summarizing conversation guidelines.

Clarifying layout capabilities.

Checking if I can make the changes for you.

Accessing knowledge base.

Calling @action for PCB layout.

Short answer: I can’t directly place components or route traces for you in Flux. Component placement, starting/stopping Auto-Layout, and manual routing are human-only actions.
What I can do for you:
  • Prepare the PCB: add/replace parts, make net connections, sync schematic-to-PCB, and change the board size.
  • Verify: check footprints, net names, and run reviews. DRC runs continuously and is shown in the Review tab.
  • Guide: recommend layout rules, placement order, and routing strategy.
If you want, I can get the PCB ready (parts, nets, board size) so you can run Auto-Layout and finish routing.
Ask placement guidance
Set board outline
Find footprints
Review decoupling
Routing strategy check
82 days
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J1 1 - U1 IN
U2 OUT - C4 P1
U1 OUT - C2 P1
GND
U3
U3 VCC - C6 P1
U3 VCC - C6 P1
  • Ground
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  • Power Net Portal
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    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
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  • Generic Capacitor
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    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
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Divine Moccasin KITT

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Welcome to your new project. Imagine what you can build here.

Properties

flowchart TD J1["2-pin USB 5V input connector"] -->|+5V_USB| VINBUS["+5V_USB net"] GND0["GND"] --> GNDNET["GND net"] VINBUS --> U1["TLV70033 LDO"] VINBUS --> U2["TLV70018 LDO"] VINBUS --> U3["TLV70011 LDO"] U1 --> V33["+3V3 rail"] U2 --> V18["+1V8 rail"] U3 --> V11["+1V1 rail"] VINBUS --> C1["1uF input cap U1"] VINBUS --> C3["1uF input cap U2"] VINBUS --> C5["1uF input cap U3"] V33 --> C2["1uF output cap U1"] V18 --> C4["1uF output cap U2"] V11 --> C6["1uF output cap U3"] C1 --> GNDNET C2 --> GNDNET C3 --> GNDNET C4 --> GNDNET C5 --> GNDNET C6 --> GNDNET

Pricing & Availability

Distributor

Qty 1

Arrow

$1.14–$1.73

LCSC

$1.83

Mouser

$2.49

TME

$0.80

Verical

$0.34–$4.45

Controls