USB3503/ML

USB3503/ML is a USB 3.0 hub controller IC used to add multiple USB ports to a host or embedded system. The “ML” suffix usually denotes a specific package type (often Micro Leadframe) for compact, board-level implementations.
Key points:
- Upstream: USB 3.0 port to the host; downstream: typically three ports (hub function).
- Data rate: supports SuperSpeed (5 Gbps) with USB 2.0/1.1 compatibility.
- Power: supports bus-powered or self-powered operation; includes per-port power switching and overcurrent protection.
- Management: standard hub control/status interface; suitable for embedded designs with OS driver support.
Design notes:
- Check the exact port count, power requirements, and packaging in the datasheet.
- Ensure proper USB 3.0 high-speed layout and any external power considerations.
- Verify OS driver support and compliance for your target platform.
Common uses: external USB hubs, docking stations, and embedded devices needing multiple USB ports. If you have a specific vendor version, I can tailor features from its datasheet.

USB3503/ML features (concise)
- 4 downstream USB 3.0 ports + 1 upstream USB 3.0 port (hub controller)
- Full USB 3.0 SuperSpeed data path (5 Gbps) with USB 2.0/1.1 backward compatibility
- Integrated USB 3.0 PHY and hub logic (no external PHY required)
- Per-port power switching with per-port over-current protection (external FETs needed)
- Hot-plug support, port status/LED indications, and plug-and-play enumeration
- Management interface for configuration and status (I2C or SPI via control registers)
- Power management: suspend/resume, Link Power Management (LPM) and low-power states
- USB 2.0/1.1 compatibility for legacy devices
- ESD/over-voltage protection on I/O lines; suitable for reliable consumer electronics
- Package: ML (micro leadframe) QFN footprint (compact, suitable for small boards)
Note: Exact pinout, current figures, and control interface details vary by revision and packaging; consult the latest datasheet for integration specifics.

ML denotes Molded Leadframe. The USB3503/ML is an 8‑pin molded leadframe (SMD) package.

- Pin count: 28 pins in the ML package.
- Function: USB 2.0 hub controller with one upstream port and three downstream ports (i.e., a 4-port hub) and integrated per-port power switching/overcurrent protection.

Manufacturer: Standard Microsystems Corporation (SMSC), now part of Microchip Technology.
What kind of company: A semiconductor company that designs and sells USB controller/hub ICs and other interface ICs (USB, Ethernet, etc.). SMSC was acquired by Microchip in 2012 and is currently part of Microchip.

USB3503/ML are USB 3.0 hub/root-port controller ICs. Common application areas:
- Multi-port USB 3.0 hubs (external/embedded)
- Docking stations and USB expansion enclosures
- PCs, NAS, printers, set-top boxes, media players
- Automotive and industrial equipment needing high-speed USB
- OEM devices requiring USB 3.0 connectivity or OTG support

Equivalents are other USB 3.0 hub controllers from different vendors. Common options:
- VIA Labs VL812 (4-port USB 3.0 hub)
- Genesys Logic GL3520/GL3530 (USB 3.0 hub controllers)
- Texas Instruments TUSB8041 (4-port USB 3.0 hub)
Note: choose by upstream port count and package. Verify electrical/firmware/thermal specs for compatibility with your design.