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Diodes Incorporated PI5PD2557ZCEX
- Part No.:
- PI5PD2557ZCEX
- Manufacturer:
- Diodes Incorporated
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
PI5PD2557ZCEX.pdf
- Description:
- IC PWR SWITCH N-CHAN 1:1 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,844
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Product details
Overview
PI5PD2557ZCEX from Diodes Incorporated is a precision adjustable current-limited high-side power switch IC featuring ±6.5% current-limit accuracy at 4.0 A, 22 mΩ RDS(on), 3.5 μs over-current response, and programmable current limit from 500 mA to 5 A via external resistor. It operates from 2.5 V to 5.5 V and is designed for USB port protection in digital TV, set-top boxes, and VoIP phones.
For engineers reviewing the PI5PD2557ZCEX datasheet, PI5PD2557ZCEX pinout, PI5PD2557ZCEX application, or PI5PD2557ZCEX equivalent, key selection criteria include enable polarity (active-high), ILIM resistor programming range (20–187 kΩ), /FAULT deglitch timing (9 ms typ), thermal shutdown thresholds (135°C/155°C), and TDFN 3×3-8L package compatibility with high-density PCB layouts.
Technical Context
The PI5PD2557ZCEX integrates an N-channel MOSFET with internal charge pump and gate driver to enable full enhancement down to 2.5 V input. Its constant-current limiting mode activates when load current exceeds the ILIM-set threshold, reducing output voltage by operating the MOSFET in linear region rather than shutting off completely.
It features dual thermal protection: OTSD (135°C min, active during current limit) and OTSD2 (155°C min, ambient-triggered), each with 20°C hysteresis. The /FAULT pin uses a 9-ms deglitch circuit for over-current events but remains undeglitched during over-temperature faults to prevent oscillation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Current Limit Range | 500 mA–5 A (typ), set by external 20–187 kΩ resistor on ILIM pin |
| RDS(on) | 22 mΩ (typ), enabling low conduction loss and <100 mV drop at 4.5 A |
| Over-current Response | 3.5 μs (typ), fast enough to protect downstream components before energy dissipation escalates |
| /FAULT Assertion Delay | 4–15 ms deglitch window, suppressing false triggers during capacitive inrush |
| Supply Current (Disabled) | ≤2 μA max, minimizing standby power in always-on systems like set-top boxes |
| UVLO Threshold | 2.35–2.45 V with 35 mV hysteresis, preventing erratic switching during brown-out conditions |
| Thermal Shutdown | 135°C (current-limit mode) and 155°C (ambient mode), both with 20°C hysteresis for stable cycling |
Pinout & Package
Package: TDFN 3×3-8L (exposed thermal pad), RoHS-compliant, Pb-free, tape-and-reel (ZCEX suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Power ground reference and thermal path via exposed pad |
| 2, 3 | IN | Input power rail (2.5–5.5 V); dual pins reduce IR drop and improve current handling |
| 4 | /EN | Active-low enable: logic low enables switch; compatible with TTL/CMOS |
| 5 | ILIM | Analog input for current-limit programming; sources regulated current proportional to RILIM |
| 6, 7 | OUT | Switched output; dual pins support high-current routing and thermal spreading |
| 8 | /FAULT | Open-drain fault flag asserted low during over-current, over-temperature, or reverse-voltage events |
Key Features
| Feature | Design Value |
|---|---|
| Built-in soft-start | Controlled rise/fall times (1–4 ms) minimize inrush current into heavy capacitive loads |
| System-level ESD protection | 15 kV contact / 8 kV air per IEC 61000-4-2, eliminating need for external TVS diodes in USB ports |
| Reverse-voltage blocking | Detects and flags reverse bias (VOUT > VIN) to prevent backfeed damage in multi-rail systems |
| UL & CB certification | UL File E341484 and CB Scheme certified, simplifying safety compliance for consumer electronics |
| Charge-pump gate drive | Enables full N-MOSFET enhancement from 2.5 V input, avoiding P-MOSFET trade-offs in RDS(on) and size |
Applications
| USB 3.0 Host Port Protection | Digital TV Power Distribution |
|---|---|
|
Use Scenario: Protecting individual USB 3.0 downstream ports against short circuits and hot-plug in-stream surges. IC Role / Device Role / Timing Role: High-side current-limited power switch with active fault reporting and auto-recovery. Use Value: Maintains ±6.5% current accuracy across temperature while delivering up to 4.5 A, meeting USB BC1.2 and Type-C power delivery requirements without external sensing. |
Use Scenario: Isolating HDMI, tuner, and audio subsystems in smart TVs to prevent fault propagation. IC Role / Device Role / Timing Role: Programmable load switch enabling independent power sequencing and brown-out immunity. Use Value: 2.5 V UVLO with hysteresis ensures clean power-up even under weak 3.3 V rails; 2 μA standby current extends sleep-mode battery life in remote-controlled units. |
| Set-Top Box USB Hub | VoIP Phone Power Management |
|
Use Scenario: Distributing power to multiple USB peripherals (e.g., Wi-Fi dongle, storage) behind a single upstream port. IC Role / Device Role / Timing Role: Adjustable current limiter with ILIM resistor tuning to match peripheral draw profiles. Use Value: Resistor-programmable limit (e.g., 1.2 A for Wi-Fi + 2.1 A for HDD) avoids overdesign while ensuring UL-certified fault containment. |
Use Scenario: Managing PoE-powered Ethernet interface and local codec supply in enterprise VoIP handsets. IC Role / Device Role / Timing Role: Fault-aware power switch with /FAULT signaling to MCU for real-time diagnostics. Use Value: 9-ms /FAULT deglitch prevents false alarms during Ethernet link negotiation surges; 15 kV ESD rating meets IEC 61000-4-2 for field-deployed devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-limited power switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS2557DRCT | Fixed 5-A limit (no ILIM resistor), 17-mΩ RDS(on), 1.5-μs response, no reverse-voltage detection | Best for cost-sensitive designs where fixed limit suffices and faster trip is critical | Select when programmability is unnecessary and minimal propagation delay is prioritized over flexibility |
| AP22653WU-7 | Adjustable 0.5–3.7 A limit, 45-mΩ RDS(on), 10-μs response, no UL/CB certification | Suitable for non-safety-critical industrial modules where certification overhead is avoided | Choose when lower RDS(on) is not required and regulatory approvals are not mandated |
Compared with TPS2557DRCT and AP22653WU-7, the PI5PD2557ZCEX uniquely balances wide-range adjustability (500 mA–5 A), industry certifications (UL/CB), and system-level ESD robustness-making it optimal for consumer-facing USB and broadcast equipment where reliability and compliance are non-negotiable.
Availability
PI5PD2557ZCEX is available at Aetrix Electronics and suitable for USB ports/hubs, digital TV power distribution, and VoIP phone subsystems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for PI5PD2557ZCEX 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 integrated circuits, specializing in high-performance, high-reliability components for power management, signal integrity, and protection applications.
The PI5PD2557ZCEX belongs to Diodes' Precision Power Switch family, engineered specifically for USB-compliant, safety-certified, and ESD-hardened power distribution in consumer electronics and communication devices.
FAQ
What is the correct enable polarity for PI5PD2557ZCEX?
The PI5PD2557ZCEX uses active-high enable (/EN pin): a logic high (≥1.1 V) turns the power switch ON, while a logic low (≤0.66 V) disables it. This differs from the pin-compatible PI5PD2556ZCEX, which uses active-low enable. Confirm logic levels match your host controller's GPIO output swing.
How does the ILIM resistor affect current-limit accuracy?
The ILIM resistor sets the current-limit threshold via a regulated internal current source. With a 1% resistor (e.g., 27.4 kΩ), the typical limit is 4.04 A, but tolerance stacking-resistor ±1%, device ±6.5%, and temperature drift-yields a total accuracy band of ±8.5% over –40°C to +85°C. For tighter control, use 0.5% resistors and validate at worst-case temperature.
Can PI5PD2557ZCEX be used in parallel for higher current?
No-PI5PD2557ZCEX is not designed for paralleling. Its current-limit loop relies on precise ILIM pin current sensing, and mismatched RDS(on) or thermal gradients between devices would cause unequal current sharing and premature fault triggering. For >5 A, select a higher-rated single-channel switch or use a dedicated multi-phase controller.
Does /FAULT require an external pull-up resistor?
Yes-/FAULT is an open-drain output and requires an external pull-up resistor (typically 4.7–10 kΩ to VCC or microcontroller I/O rail) to generate a valid logic-high level when inactive. The internal sink capability is rated for ≤10 mA continuous, sufficient to drive standard CMOS inputs without additional buffering.
PI5PD2557ZCEX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- 8-WDFN Exposed Pad
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Switch Type:
- USB Switch
- Number of Outputs:
- 1
- Ratio - Input:Output:
- 1:1
- Output Configuration:
- High Side
- Output Type:
- N-Channel
- Interface:
- On/Off
- Voltage - Load:
- 2.5V ~ 5.5V
- Voltage - Supply (Vcc/Vdd):
- Not Required
- Current - Output (Max):
- 5A
- Rds On (Typ):
- 22mOhm
- Input Type:
- Non-Inverting
- Features:
- Status Flag
- Fault Protection:
- Current Limiting (Adjustable), Over Temperature, UVLO
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TDFN (3x3)
PI5PD2557ZCEX FAQ
1.How can I place an order for PI5PD2557ZCEX through Aetrix?
Please submit a Request for Quotation (RFQ) for PI5PD2557ZCEX on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for PI5PD2557ZCEX reliable?
The price and inventory of PI5PD2557ZCEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI5PD2557ZCEX is usually 5 days.
3.What payment methods are accepted for PI5PD2557ZCEX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI5PD2557ZCEX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI5PD2557ZCEX?
PI5PD2557ZCEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI5PD2557ZCEX order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for PI5PD2557ZCEX?
For technical support, including PI5PD2557ZCEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI5PD2557ZCEX requirements.
6.How does Aetrix verify that PI5PD2557ZCEX is sourced from the original manufacturer or authorized distributors?
All PI5PD2557ZCEX products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that PI5PD2557ZCEX meets industry standards.
7.What is the process for return or replacement of PI5PD2557ZCEX?
All PI5PD2557ZCEX units undergo pre-shipment inspection (PSI). If there is an issue with PI5PD2557ZCEX, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The PI5PD2557ZCEX part is unused and in its original packaging.
Return procedure for PI5PD2557ZCEX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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