Diodes Incorporated PI5PD2556ZCEX

Overview

PI5PD2556ZCEX from Diodes Incorporated is a single-channel, adjustable current-limited high-side power switch using an N-channel MOSFET for USB and digital consumer power distribution. It delivers ±6.5% current-limit accuracy at 4.0 A, features 22 mΩ R_DS(on), operates from 2.5 V to 5.5 V, and responds to over-current in 3.5 μs - deployed in USB ports, set-top boxes, and VoIP phones.

For engineers reviewing the PI5PD2556ZCEX datasheet, PI5PD2556ZCEX pinout, PI5PD2556ZCEX application, or PI5PD2556ZCEX equivalent, key selection criteria include programmable current limit (500 mA–5 A), fast fault response, thermal shutdown behavior, and TDFN 3×3-8L package compatibility with high-density PCB layouts.

Technical Context

The device integrates an internal charge pump to drive the N-channel MOSFET gate above the source rail, enabling full enhancement down to 2.5 V input. Its current-limit threshold is set by an external resistor (R_ILIM) on the ILIM pin, with supported range 20 kΩ–187 kΩ yielding 500 mA–5 A typical limit.

Over-current detection triggers constant-current mode operation, reducing output voltage while maintaining precise load current. Fault reporting uses a deglitched (9 ms typ) active-low open-drain /FAULT output, and dual thermal protection activates at 135°C (current-limit mode) and 155°C (ambient mode), each with 20°C hysteresis.

Key Specifications

Pinout & Package

TDFN 3×3-8L package with exposed thermal pad; 0.5 mm pitch, 0.8 mm nominal height, RoHS-compliant and Pb-free (Green).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar current-limited power switch applications.

Compared with TPS2557DRCT and AP22653WU-7, PI5PD2556ZCEX uniquely balances wide programmability (500 mA–5 A), certified safety (UL E341484), and system-level ESD robustness - making it optimal for certified consumer electronics requiring field-reliable fault containment.

Availability

PI5PD2556ZCEX is available at Aetrix Electronics and suitable for USB ports, digital TV power rails, and VoIP phone subsystems requiring stable component supply, long-term lifecycle support, and certified safety compliance.

Supply support for PI5PD2556ZCEX 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for consumer, industrial, and communications markets.

The PI5PD2556ZCEX belongs to Diodes' precision power-distribution switch product line, engineered specifically for USB-compliant, safety-certified, and ESD-hardened applications in digital consumer electronics.

FAQ

What is the function of the ILIM pin, and how does resistor tolerance affect current-limit accuracy?

The ILIM pin accepts an external resistor to set the current-limit threshold between 500 mA and 5 A. A 1% resistor yields ±6.5% current-limit accuracy at 4 A; tighter tolerances (0.5% or 0.1%) improve system-level accuracy. For example, a 27.4 kΩ resistor targets 4.0 A, but its ±1% variation shifts the actual limit between 3.76 A and 4.26 A.

How does the /FAULT pin behave during a short-circuit event, and what is its deglitch timing?

The /FAULT pin asserts low during over-current, over-temperature, or reverse-voltage faults. It includes a 9 ms (typ) deglitch timer for over-current conditions to suppress false triggers from inrush into capacitive loads. No deglitch applies during thermal shutdown, ensuring immediate fault indication for die overheating.

Does PI5PD2556ZCEX support 3.3 V logic enable signals, and what are the voltage thresholds?

Yes - the /EN pin is TTL/CMOS-compatible. Logic high (>1.1 V) disables the switch; logic low (<0.66 V) enables it. At 3.3 V system rails, standard GPIO outputs meet these thresholds with margin. Input leakage is <100 nA, minimizing impact on driving circuitry.

What thermal protection mechanisms are implemented, and how do they differ?

Two independent thermal sensors exist: OTSD trips at 135°C (min) only during current-limit operation, and OTSD2 trips at 155°C (min) regardless of operating mode. Both include ~20°C hysteresis. After shutdown, the device auto-restarts once cooled - cycling until fault removal, preventing permanent latch-up under sustained overload.