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onsemi FAN25800AUC28X
- Part No.:
- FAN25800AUC28X
- Manufacturer:
- onsemi
- Package:
- 4-XFBGA, WLCSP
- Datasheet:
-
FAN25800AUC28X.pdf
- Description:
- IC REG LINEAR 2.8V 250MA 4WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:3,100
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Product details
Overview
FAN25800AUC28X from ON Semiconductor is a 2.8 V, 250 mA linear low-dropout (LDO) regulator optimized for noise-sensitive portable applications. It delivers ultra-low quiescent current (17 µA), low output noise (19 nV/√Hz at 10 kHz, 8 µVRMS integrated), and <70 mV dropout at 250 mA load, operating from 2.3 V to 5.5 V input. It is used in WiFi modules and smart handhelds where compact size and clean power are critical.
For engineers reviewing the FAN25800AUC28X datasheet, pinout, applications, or equivalent options, key selection criteria include its WLCSP-4 package footprint, enable-controlled shutdown (<1 µA), thermal/short-circuit protection, and stability with 0201 ceramic capacitors - all validated for space-constrained, battery-powered designs.
Technical Context
The FAN25800AUC28X integrates a PMOS pass transistor with controlled soft-start to limit inrush current during enable assertion. Its internal reference and error amplifier maintain tight output regulation (±1.9%) across load (5–250 mA) and input (2.3–5.5 V) variations while delivering 85 dB PSRR at 100 Hz.
Protection logic includes under-voltage lockout (UVLO rising threshold 2.1–2.3 V, 150 mV hysteresis), thermal shutdown (150 °C trip, 20 °C hysteresis), and short-circuit current limiting (275–400 mA at 2.8 V). Shutdown supply current is specified at 0.125–1.0 µA with EN = 0 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VOUT | Fixed 2.8 V output - eliminates external feedback network; supports precise rail for RF front-ends or baseband ICs. |
| IOUT_MAX | 250 mA maximum continuous output - sufficient for WiFi transceivers or application processors' I/O rails. |
| Dropout Voltage | <70 mV at 250 mA - enables operation with minimal headroom (e.g., 3.0 V input → 2.8 V output), extending battery life. |
| Output Noise | 19 nV/√Hz at 10 kHz (8 µVRMS, 10 Hz–100 kHz) - suppresses switching noise coupling into analog/RF sections. |
| IQ | 17 µA typical quiescent current - minimizes standby power loss in always-on subsystems like Bluetooth LE or sensor hubs. |
| PSRR | 73 dB at 100 Hz, 76 dB at 10 kHz (250 mA load) - effective rejection of DC-DC ripple when used as post-regulator. |
| Enable Threshold | VIL ≤ 0.4 V, VIH ≥ 1.05 V - compatible with 1.8 V logic control without level-shifting. |
Pinout & Package
Package: 4-ball WLCSP, 0.65 mm × 0.65 mm, 0.35 mm pitch, 330 µm max thickness - designed for ultra-compact PCB layouts in mobile and wearable devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 VIN | Input power supply connection | Accepts 2.3–5.5 V; requires local 1.5 µF 0201 ceramic capacitor for stability and EMI filtering. |
| A2 VOUT | Regulated output voltage node | Delivers fixed 2.8 V; supports dual 1.5 µF 0201 output caps for optimal transient response and noise suppression. |
| B1 EN | Active-high enable control | Pulled low to enter shutdown (<1 µA IQ); must not float; driven by 1.8 V logic per recommendation. |
| B2 GND | Power and signal reference ground | Common return path for input/output currents; requires low-impedance connection to PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Stable with 0201 ceramics | Validated for use with two 1.5 µF, 0201 X5R MLCCs - reduces board area by >50% vs. 0402/0603 alternatives. |
| Controlled soft-start | Startup time 250–500 µs to 95% VOUT - prevents input rail sag and avoids false resets in system power sequencing. |
| Low-noise architecture | 8 µVRMS integrated noise over 10 Hz–100 kHz - meets stringent requirements for RF synthesizers and ADC reference supplies. |
| Thermal + SCP protection | Auto-recovery thermal shutdown (150 °C trip, 20 °C hysteresis) and current-limited short-circuit response - ensures robustness in unattended portable deployments. |
| UVLO with hysteresis | 2.1–2.3 V rising threshold with 150 mV hysteresis - prevents erratic startup during brown-out conditions in Li-ion battery discharge profiles. |
Applications
| WiFi Module Power | Smartphone Baseband Rail |
|---|---|
Use Scenario: Powers 2.4 GHz/5 GHz WiFi transceiver ICs (e.g., QCA9377, BCM4356) in compact IoT gateways and mobile hotspots. IC Role / Device Role / Timing Role: Post-regulator cleaning DC-DC output ripple and suppressing broadband switching noise before RF front-end stages. Use Value: Enables 20 dB improvement in adjacent channel power ratio (ACPR) by reducing phase noise contribution from supply-induced VCO jitter. | Use Scenario: Supplies I/O or auxiliary logic rails in smartphone application processors (e.g., Snapdragon 4xx series) during active and low-power modes. IC Role / Device Role / Timing Role: Low-quiescent LDO providing stable 2.8 V for SDIO, USB PHY, or camera interface blocks. Use Value: Extends standby battery life by maintaining 17 µA IQ while meeting ±1.9% accuracy and fast load transient recovery (<10 µs). |
| Portable Medical Sensor Hub | Wearable BLE Subsystem |
Use Scenario: Powers analog front-end (AFE) and low-power MCU in FDA-cleared wearable ECG monitors with single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Primary regulated supply for precision ADC reference and op-amp biasing circuits requiring ultra-low noise. Use Value: Delivers 8 µVRMS noise floor enabling sub-1 µVPP ECG signal integrity without additional filtering components. | Use Scenario: Supplies Nordic nRF52832 or TI CC2640R2F SoCs in hearables and fitness trackers where board space is constrained to <100 mm². IC Role / Device Role / Timing Role: Compact, enable-controlled LDO powering radio and sensor interface logic in intermittent transmit/receive duty cycles. Use Value: WLCSP-4 footprint (0.65 mm × 0.65 mm) saves >0.4 mm² vs. SOT-23-5; shutdown current <1 µA preserves battery during deep sleep. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6210B282MR-G | 2.8 V, 200 mA, 25 µA IQ, 25 µVRMS noise, SOT-25 package | Lower max output current and higher noise; larger SOT-25 footprint (2.9 mm × 2.8 mm) | Choose if board layout allows larger package and 200 mA suffices; avoid for high-transient WiFi loads. |
| Richtek RT9013-28GB | 2.8 V, 300 mA, 2.5 µA IQ, 40 µVRMS noise, SOT-23-5 package | Lower IQ but higher noise; no UVLO; different enable polarity (active-low) | Prefer for ultra-low standby power where noise tolerance >40 µVRMS; verify enable logic compatibility. |
Compared with XC6210B282MR-G and RT9013-28GB, the FAN25800AUC28X uniquely balances 250 mA capability, 17 µA IQ, 8 µVRMS noise, and UVLO/thermal protection in a 0.42 mm² WLCSP - making it optimal for miniaturized, noise-critical, battery-operated RF systems.
Availability
FAN25800AUC28X is available at Aetrix Electronics and suitable for WiFi modules, smartphone baseband rails, and portable medical sensor hubs requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for FAN25800AUC28X 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
ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power management, analog, and sensing solutions for automotive, industrial, and portable electronics.
The FAN25800 series was developed by Fairchild Semiconductor (now part of ON Semiconductor) specifically for ultra-compact, low-noise power regulation in space-constrained mobile and wireless devices.
FAQ
What is the maximum output current supported by the FAN25800AUC28X?
The FAN25800AUC28X supports a maximum continuous output current of 250 mA at 2.8 V output. This rating applies under recommended operating conditions (VIN = VOUT + 0.3 V, TA = –40°C to +85°C). Exceeding this current may trigger current-limit protection or thermal shutdown, especially without adequate PCB copper area for heat dissipation.
Does the FAN25800AUC28X require external compensation components?
No, the FAN25800AUC28X does not require external compensation. It is internally compensated and designed to be stable with small ceramic capacitors - specifically two 1.5 µF, 0201-case X5R MLCCs on the output. The device's loop stability is guaranteed across the full 400 nF–15 µF output capacitance range with ESR between 3–100 mΩ.
What is the enable pin behavior and recommended drive voltage for the FAN25800AUC28X?
The EN pin of the FAN25800AUC28X is active-high with VIH ≥ 1.05 V and VIL ≤ 0.4 V. It has no internal pull-down, so it must be actively driven - floating is prohibited. ON Semiconductor recommends using 1.8 V logic to drive EN, and direct tie-to-VIN is discouraged due to potential overvoltage risk during startup transients.
How does the FAN25800AUC28X handle thermal overload conditions?
The FAN25800AUC28X features thermal shutdown protection that activates at 150 °C junction temperature with 20 °C hysteresis. When triggered, the output is disabled until the die cools below 130 °C, after which a full soft-start sequence resumes regulation. This behavior is confirmed in the Electrical Specifications table and Circuit Description section of the FAN25800 datasheet Rev. 1.5.
Can the FAN25800AUC28X be used as a post-regulator after a DC-DC converter?
Yes, the FAN25800AUC28X is explicitly designed for post-DC-DC regulation. Its 85 dB PSRR at 100 Hz and low 19 nV/√Hz noise make it ideal for cleaning buck converter ripple in RF and precision analog applications. Figure 17 in the FAN25800 datasheet shows a validated implementation where the buck's output capacitor serves as the LDO's input capacitor.
FAN25800AUC28X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 4-XFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.13V @ 250mA
- Current - Output:
- 250mA
- Current - Quiescent (Iq):
- 25 µA
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- Enable
- Protection Features:
- Over Temperature, Short Circuit, Under Voltage Lockout (UVLO)
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 4-WLCSP (0.65x0.65)
FAN25800AUC28X FAQ
1.How can I place an order for FAN25800AUC28X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN25800AUC28X 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 FAN25800AUC28X reliable?
The price and inventory of FAN25800AUC28X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN25800AUC28X is usually 5 days.
3.What payment methods are accepted for FAN25800AUC28X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN25800AUC28X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN25800AUC28X?
FAN25800AUC28X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN25800AUC28X 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 FAN25800AUC28X?
For technical support, including FAN25800AUC28X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN25800AUC28X requirements.
6.How does Aetrix verify that FAN25800AUC28X is sourced from the original manufacturer or authorized distributors?
All FAN25800AUC28X 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 FAN25800AUC28X meets industry standards.
7.What is the process for return or replacement of FAN25800AUC28X?
All FAN25800AUC28X units undergo pre-shipment inspection (PSI). If there is an issue with FAN25800AUC28X, 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 FAN25800AUC28X part is unused and in its original packaging.
Return procedure for FAN25800AUC28X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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