Hardware CC Logic / FUSB302 / Dual CC Controller
10V-15V To 5V Synchronous USB-C Buck Converter
Overview
A synchronous buck converter designed to step down a 10V to 15V input to 5V for powering single or multiple USB-C charging ports.
William noyeSystem architecture
POWER
MCU
- POWER_IN → HIGH_CURRENT_SYNC_BUCK10V-15VSupplies raw DC input voltage to the synchronous buck regulator.
- HIGH_CURRENT_SYNC_BUCK → PORT_POWER_DISTRIBUTION5.0VDelivers regulated 5V power to the port power distribution switches.
- PORT_POWER_DISTRIBUTION → VBUS_OUT5.0VRoutes protected 5V VBUS to the USB-C output receptacles.
- USB_C_PORT_CTRL → VBUS_OUT3.3VConnects CC lines for cable orientation and device attach detection.
Bill of materials
| Part number | Type | Component | Manufacturer | Package | Qty | Datasheet | Match |
|---|---|---|---|---|---|---|---|
| 0T001001CH | POWER | DC Barrel Jack / Terminal Block + Input Filtering Accepts 10V-15V DC input and provides bulk capacitance and reverse polarity protection. | Various | — | 1 | Pending | |
3 alternatives consideredAI verified | |||||||
| APK43070Q | POWER | Monolithic Power Systems MP2481 / Diodes Inc APK43070Q Steps down 10V-15V input to stable 5V output with synchronous rectification for high efficiency (>90%). | Various | — | 1 | Pending | |
3 alternatives consideredAI verified | |||||||
| TPS2052CDGNR | POWER | USB Type-C Port Power Switch & Current Limit Controller Distributes 5V VBUS to multiple USB-C ports with individual overcurrent protection (OCP) and electronic fusing. | Texas Instruments | 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad | 1 | Matched | |
| FUSB302B | MCU | Hardware CC Logic / FUSB302 / Dual CC Controller Provides CC1/CC2 pulldowns, orientation detection, and attach/detach signaling for standard 5V USB Type-C delivery. | On Semiconductor | — | 1 | Matched | |
5 alternatives consideredAI verified | |||||||
| DX07B024JJ3R1600 | POWER | Dual USB Type-C Receptacles Physical connection interface for connected devices to draw 5V power. | JAE Electronics | Tape & Reel (TR) Cut Tape (CT) Digi-Reel® | 2 | Matched | |
Build guide
3-5 hoursIntermediate
1
Procurement & Preparation
- Procure all required Bill of Materials including the DC Barrel Jack (0T001001CH), the synchronous step-down regulator APK43070Q, the current limit controller TPS2052CDGNR, the FUSB302B CC controller, and two DX07B024JJ3R1600 dual USB Type-C receptacles.
- Prepare the PCB stencil, solder paste (SAC305 lead-free), and verify Gerber files for the 10V-15V to 5V USB-C buck converter layout, checking thermal vias under the APK43070Q regulator.
2
Hardware Assembly & Wiring
- Apply SAC305 solder paste to the PCB pads using the stencil, then use a pick-and-place machine or precision tweezers to populate the DC barrel jack (0T001001CH), input filtering capacitors, and the synchronous buck regulator (APK43070Q).
- Place the USB Type-C power switch and current limit controller (TPS2052CDGNR), the hardware CC logic controller (FUSB302B), and the dual USB Type-C receptacles (DX07B024JJ3R1600) onto their respective footprints.
- Pass the populated PCB through a reflow oven using a standard lead-free thermal profile (peak temperature ~245°C) to solder all surface-mount components, followed by manual soldering of the through-hole DC barrel jack if necessary.
3
Firmware Setup
- Connect the I2C and configuration lines of the FUSB302B CC controller to the programming interface jig to flash or verify default register configurations for standard 5V USB Type-C pull-down current sourcing (Default USB power vs. 1.5A/3.0A capability).
4
Testing & Calibration
- Apply a controlled 12V DC input across the POWER_IN interface (DC Barrel Jack / Terminal Block) using a DC power supply with current limiting enabled, and measure the intermediate bus voltage to verify the APK43070Q steps down cleanly to 5.0V VOUT.
- Test the dual USB Type-C receptacles (DX07B024JJ3R1600) using a USB-C sink analyzer and electronic load to verify proper CC1/CC2 orientation detection by the FUSB302B and that the TPS2052CDGNR power switch successfully delivers 5V VBUS under load with functioning overcurrent protection (OCP).
Document
10V-15V To 5V Synchronous USB-C Buck Converter
A synchronous buck converter designed to step down a 10V to 15V input to 5V for powering single or multiple USB-C charging ports.
Executive Summary
This reference design defines the system architecture, critical component candidates, risk register, and validation path for USB-C Buck Converter. It is a system-level design deliverable; verify critical claims with manufacturer evidence and prototype testing before production release.
Design Overview
Requirements Coverage
| Requirement | Architecture coverage | Status |
|---|---|---|
| Step down 10V-15V input voltage to 5V | Pending validation | Needs verification |
| Synchronous buck conversion for high efficiency | Pending validation | Needs verification |
| Power single or multiple USB-C charging ports | Pending validation | Needs verification |
| Item | Details |
|---|---|
| Product Type | USB-C Buck Converter |
| Key Functions | Step down 10V-15V input voltage to 5V, Synchronous buck conversion for high efficiency, Power single or multiple USB-C charging ports |
| Power Source | 10V to 15V DC Input |
| Connectivity | |
| Size | compact |
| Environment | indoor |
| Difficulty | Intermediate |
| Est. Time | 3-5 hours |
System Architecture
Power Topology: DC Input (10V-15V) -> Synchronous Buck Regulator (5V @ up to 6A) -> Port Power Distribution Switches -> Dual USB-C VBUS
Module List
| Module ID | Type | Name | Function | Voltage |
|---|---|---|---|---|
| POWER_IN | POWER | DC Barrel Jack / Terminal Block + Input Filtering | Accepts 10V-15V DC input and provides bulk capacitance and reverse polarity protection. | 12V |
| HIGH_CURRENT_SYNC_BUCK | POWER | Monolithic Power Systems MP2481 / Diodes Inc APK43070Q | Steps down 10V-15V input to stable 5V output with synchronous rectification for high efficiency (>90%). | 5V |
| PORT_POWER_DISTRIBUTION | POWER | USB Type-C Port Power Switch & Current Limit Controller | Distributes 5V VBUS to multiple USB-C ports with individual overcurrent protection (OCP) and electronic fusing. | 5V |
| USB_C_PORT_CTRL | MCU | Hardware CC Logic / FUSB302 / Dual CC Controller | Provides CC1/CC2 pulldowns, orientation detection, and attach/detach signaling for standard 5V USB Type-C delivery. | 3.3V |
| VBUS_OUT | POWER | Dual USB Type-C Receptacles | Physical connection interface for connected devices to draw 5V power. | 5V |
Power Tree and Signal Interfaces
| From | To | Type | Interface / rail | Voltage |
|---|---|---|---|---|
| POWER_IN | HIGH_CURRENT_SYNC_BUCK | power | 10V-15V | 10V-15V |
| HIGH_CURRENT_SYNC_BUCK | PORT_POWER_DISTRIBUTION | power | 5.0V | 5.0V |
| PORT_POWER_DISTRIBUTION | VBUS_OUT | power | 5.0V | 5.0V |
| USB_C_PORT_CTRL | VBUS_OUT | data | 3.3V | 3.3V |
Design Schemes
Multi-Port Synchronous Buck USB-C Power Solution ★
High-efficiency multi-port synchronous buck conversion leveraging an integrated controller and dual USB-C port power distribution.
Trade-offs: Higher component complexity and larger board footprint, but delivers multi-port flexibility and up to 6A total output current.
Single USB-C Port Synchronous Buck Solution
Utilizes an integrated synchronous buck regulator IC with internal MOSFETs powering a single USB-C port via a dedicated CC-line controller for standard 5V/3A output capability.
Trade-offs: Lowest BOM cost and smallest footprint; limited to single-port output current capability.
Key IC selection
Synchronous Buck Regulator
- Need: Step down 10V-15V input to 5V output with high efficiency (>90%) and sufficient current capability for multi-port USB charging
- Class: Monolithic Synchronous Step-Down DC-DC Converter
- Shortlist: MPS MP2481 family, Diodes Inc AP64307Q family
- Pick: Select catalog MPN based on continuous output current rating, switching frequency to avoid AM/FM bands, and thermal package performance.
USB-C Power Switch and Current Limit
- Need: Distribute 5V to multiple USB-C ports with programmable or fixed current limiting and fault reporting
- Class: High-Side Power Distribution Switch with Adjustable Current Limit
- Shortlist: TI TPS25810 family, Richtek RT9742 family
- Pick: Select catalog MPN based on number of channels required, accurate current-limit threshold, and built-in discharge function.
USB-C Type-C Controller / CC Logic
- Need: Provide CC line termination, attach/detach detection, and default 5V current advertisement (3A/1.5A/Default)
- Class: Stand-alone USB Type-C Controller / CC Logic IC
- Shortlist: FUSB302, TUSB321
- Pick: Select catalog MPN based on interface type (I2C vs. hardware pin-strapped) and system power consumption in standby.
Risk register
| ID | Area | Severity | Detail | Mitigation |
|---|---|---|---|---|
| r1 | thermal | high | High ambient temperature combined with step-down conversion from 15V to 5V under full multi-port load can cause excessive thermal stress in a compact enclosure. | Ensure adequate copper pour on the PCB for the thermal pad of the buck regulator and consider derating total output current if thermal limits are approached. |
| r2 | emi | med | High switching frequencies of the synchronous buck converter may cause conducted and radiated EMI issues near USB-C data lines. | Place input/output ceramic capacitors close to the IC pins, use a well-shielded inductor, and maintain a solid ground plane with careful layout to minimize switching loop area. |
| r3 | power | med | Simultaneous heavy loads on dual USB-C ports could trigger transient voltage drops or overcurrent protection false trips during dynamic load steps. | Select power switches with fast transient response and place low-ESR bulk capacitance at both the buck output and the VBUS distribution input. |
Bring-up and Validation Plan
- Power-off inspection and rail resistance checks
- Current-limited first power-up; verify every rail before enabling loads
- Validate interfaces and timing one subsystem at a time
- Run thermal, fault-injection, EMC pre-scan, and endurance tests for the target environment
Key Components
3/5 modules matched to real parts. See the BOM tab for the full component table.
DC Barrel Jack / Terminal Block + Input Filtering (0T001001CH)
Rejected weak/wrong-class catalog hits; using web recommendation: 0T001001CH
Monolithic Power Systems MP2481 / Diodes Inc APK43070Q (APK43070Q)
Rejected weak/wrong-class catalog hits; using web recommendation: APK43070Q
USB Type-C Port Power Switch & Current Limit Controller (TPS2052CDGNR)
The candidate MPN (TPS2052CDGNR) exactly matches the primary MPN and belongs to the correct power distribution switch co
Hardware CC Logic / FUSB302 / Dual CC Controller (FUSB302B)
FUSB302TMX from FAIRCHILD matches the primary MPN prefix FUSB302 with a valid ordering suffix (TMX), fitting the 'Variou
Dual USB Type-C Receptacles (DX07B024JJ3R1600)
The candidate's MPN (DX07B024JJ3R1600) matches the primary MPN and the manufacturer is JAE Electronics.
Build Summary
- Difficulty: Intermediate
- Estimated time: 3-5 hours
- Tools required: Inventory Management System, Antistatic Storage Bins, PCB Stencil, Squeegee, SAC305 Solder Paste, Pick and Place Machine
See the Build tab for the full step-by-step assembly guide.
Evidence and Limitations
- Confirm part parameters, certifications, and compatibility against current manufacturer documents.
- Treat industry compliance without test or certificate evidence as a compliance gap, not an approval.
- See Reference Images for visual artifacts and Build Guide for detailed assembly and bring-up steps.