Texas Instruments TPS2075DB

Overview

TPS2075DB from Texas Instruments is a four-port USB hub power controller IC with independent high-side N-channel MOSFET switches, integrated 3.3-V/100-mA LDO regulator, and bus/self-power mode auto-switching logic. It delivers 500 mA per port in self-powered mode (SP→OUTx) and 100 mA per port in bus-powered mode (BP→OUTx), supports USB 1.1/2.0 compliance, and operates across –40°C to 85°C ambient temperature.

For engineers reviewing the TPS2075DB datasheet, TPS2075DB pinout, TPS2075DB application, or TPS2075DB equivalent, key selection considerations include BPMODE polarity (active-high for TPS2075), PG_DLY-adjustable power-good timing, DP0_RST hub reset signaling, thermal/short-circuit protection per channel, and dual-supply enable logic compatible with TTL/CMOS levels.

Technical Context

The TPS2075DB implements two independent power switch domains: SP-to-OUTx paths use 100-mΩ MOSFETs rated for 500 mA continuous current, while BP-to-OUTx paths use 500-mΩ MOSFETs rated for 100 mA - both with no parasitic body diodes to prevent backfeed. Its control logic monitors BP and SP voltages against UVLO thresholds (BP start: 4.25 V, SP start: 4.5 V) and enables automatic switchover unless disabled via BP_DIS.

It integrates a 3.3-V LDO (3.2–3.4 V output, 100-mA max, 0.6-V dropout) with PG and PG_DLY pins for programmable delay (e.g., 0.47 µF → 190 ms), plus dedicated OCx outputs (active-low, 3.2-mA sink) per port and BPMODE output signaling bus-powered mode with active-high polarity - distinct from the TPS2074's active-low BPMODE.

Key Specifications

Pinout & Package

TPS2075DB is housed in a 24-pin SSOP (DB) package with 0.64-mm pitch, RoHS-compliant, and available taped/reel (TPS2075DBR). Pin functions are validated per TI SLVS288A datasheet.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar USB hub power management applications.

Compared with TPS2074DB, the TPS2075DB offers identical protection, switching, and regulation but with active-high BPMODE - eliminating firmware inversion. Versus TPS2064D, it adds four-port support, integrated LDO, and USB-compliant reset signaling - making it suitable for full-featured, single-chip hub designs.

Availability

TPS2075DB is available at Aetrix Electronics and suitable for USB hub development, industrial docking stations, and portable multiport adapters requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for TPS2075DB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, precision, and system-level integration.

The TPS207x family was designed specifically for USB hub power management - integrating high-side switches, LDO regulation, and USB-compliant signaling in a single IC to simplify compliance and reduce bill-of-materials for USB peripheral manufacturers.

FAQ

What is the BPMODE polarity difference between TPS2075DB and TPS2074DB?

The TPS2075DB features an active-high BPMODE output that asserts logic high when operating in bus-powered mode. In contrast, the TPS2074DB uses active-low BPMODE. This polarity difference requires corresponding firmware logic adjustments in the USB hub controller to correctly interpret power-source status - the TPS2075DB eliminates the need for external inversion circuitry or software negation.

Does TPS2075DB require external capacitors, and what are the critical values?

Yes, TPS2075DB requires several external capacitors: a 0.1-µF ceramic + 10-µF bulk capacitor on BP–AGND; 0.1-µF + 68-µF on SP–AGND; 33-µF (min) per OUTx–GND for heavy loads; and 4.7–33 µF on 3.3V_OUT–GND with 0.2–10 Ω ESR. The PG_DLY pin requires a timing capacitor (e.g., 0.47 µF) to set power-good delay - omission causes improper hub controller reset sequencing.

How does TPS2075DB handle overcurrent conditions on individual ports?

TPS2075DB monitors each port independently using internal sense FETs. When overcurrent is detected, it limits output current and pulls the corresponding OCx pin low (open-drain, 3.2-mA sink capability). OCx remains asserted until the fault clears - enabling microcontrollers to log faults per port. No external current-sense resistors are needed, preserving efficiency and board space.

Can TPS2075DB be used in a hub without an integrated 3.3-V regulator?

No - the TPS2075DB includes a mandatory 3.3-V/100-mA LDO regulator whose 3.3V_OUT pin must be used to power the USB hub controller. If a 5-V regulator is required instead, TI recommends the TPS2070 or TPS2071. The TPS2075DB is not functionally compatible with hub designs relying solely on external 3.3-V supplies, as its internal LDO is integral to PG generation and control logic operation.

What is the purpose of the DP0_RST pin on TPS2075DB, and how is it connected?

The DP0_RST pin on TPS2075DB generates a clean USB attach/detach signal on the upstream DP0 data line. It connects through a 1.5-kΩ resistor to the host's DP0 line. During attach, DP0_RST pulses low then goes Hi-Z to discharge cable capacitance, followed by a high state - ensuring proper enumeration. Detachment is signaled by Hi-Z. Its timing is synchronized with PG and adjustable via PG_DLY, making it essential for USB specification compliance.