STMicroelectronics ST2054BD

Overview

ST2054BD from STMicroelectronics is a quad-channel high-side power distribution switch featuring four independent 80mΩ N-channel MOSFETs, 500mA continuous current per channel, thermal and short-circuit protection with active-low OCx outputs, and operation from 2.7V to 5.5V supply. It is used in multi-rail power management for industrial I/O modules and embedded systems with hot-swap-capable peripherals.

For engineers reviewing the ST2054BD datasheet, ST2054BD pinout, ST2054BD application, or ST2054BD equivalent, key selection criteria include per-channel enable control, 10ms fault blanking, 2.5ms typical rise time, under-voltage lockout, and SO-16 package compatibility with board-level thermal design constraints.

Technical Context

The ST2054BD integrates an internal charge pump to drive N-channel MOSFET gates without external components, enabling full enhancement down to 2.7V input while controlling rise/fall times to suppress inrush current. Each channel operates independently with CMOS/TTL-compatible ENx inputs and dedicated OCx fault reporting.

Current limiting is set at 0.9A (typical short-circuit threshold), with automatic thermal shutdown triggered above 125°C junction temperature and self-recovery upon cooling. Undervoltage lockout activates below ~2.0V (2.5V threshold with 100mV hysteresis) to prevent erratic switching during brownout conditions.

Key Specifications

Pinout & Package

ST2054BD is housed in a standard SO-16 (Small Outline, 16-pin) package with 1.27 mm pitch, ECOPACK® compliant, and rated for surface-mount reflow assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad-channel high-side power switch applications.

Compared with TPS2054C and AP22654WS-7, ST2054BD uniquely combines 2.7V operation, per-channel thermal shutdown, and integrated charge pump in SO-16 - making it optimal for space-constrained, wide-input industrial and medical power sequencers requiring autonomous fault handling.

Availability

ST2054BD is available at Aetrix Electronics and suitable for industrial PLC I/O modules, USB-C docking stations, and medical patient monitoring units requiring stable component supply and long-term production continuity.

Supply support for ST2054BD 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in microcontrollers, power management, analog ICs, and automotive-grade silicon.

The ST2054 belongs to ST's high-side power switch product line, designed specifically for robust, multi-channel power distribution in industrial automation, medical instrumentation, and computing peripherals where reliability under fault conditions is critical.

FAQ

What is the maximum junction temperature before thermal shutdown activates?

Thermal shutdown activates when the junction temperature exceeds 125°C, as specified in the absolute maximum ratings table. The device remains latched off until junction temperature falls below the thermal hysteresis threshold (~110°C), after which it automatically recovers without external reset. This behavior is verified across -40°C to +85°C ambient conditions and accounts for internal power dissipation under sustained overload.

Can ST2054BD drive capacitive loads up to 1000µF safely?

Yes - the 2.5ms typical rise time and internal charge pump limit di/dt to prevent destructive inrush into large capacitive loads. With R_DS(on) = 80mΩ and 500mA rating, it safely charges 1000µF to 5V in ~12.5ms (t = R·C ≈ 0.08Ω × 1000µF), well within safe SOA limits. Layout best practices (short traces, local bulk capacitance) are recommended to minimize parasitic ringing.

Is the OCx output compatible with 3.3V logic systems?

Yes - OCx outputs are open-drain with 10mA sink capability and guaranteed VO(L) ≤ 0.5V at IO = 5mA, ensuring reliable low-level assertion into 3.3V CMOS inputs. No pull-up resistor is required if interfacing with microcontroller GPIOs configured with internal pull-ups; otherwise, a 10kΩ external pull-up to 3.3V is sufficient for noise-immune signaling.

Does ST2054BD support daisy-chained fault reporting?

No - each OCx pin operates independently and is not internally wired for wired-OR or daisy-chain configurations. However, external hardware (e.g., OR-ing diodes or logic gates) can combine OC1–OC4 signals into a single system fault line. The datasheet does not define timing skew between OCx assertions, so synchronous fault aggregation requires external synchronization circuitry.