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onsemi FAN4860UC33X
- Part No.:
- FAN4860UC33X
- Manufacturer:
- onsemi
- Package:
- 6-UFBGA, WLCSP
- Datasheet:
-
FAN4860UC33X.pdf
- Description:
- IC REG BOOST 3.3V 650MA 6WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:4,753
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Product details
Overview
FAN4860UC33X from ON Semiconductor (formerly Fairchild) is a 3 MHz synchronous boost DC-DC regulator in WLCSP-6 package, delivering fixed 3.3 V output from 2.3–3.2 V input, supporting up to 300 mA load at VIN = 2.7 V, with true load disconnect during shutdown and integrated synchronous rectifier. It targets Li-ion battery-powered portable systems requiring compact, high-efficiency voltage boosting.
For engineers reviewing the FAN4860UC33X datasheet, pinout, applications, or equivalent options, key selection criteria include its 3.3 V fixed output, 2.3–3.2 V input range, 300 mA max load capability at 2.7 V input, 92% peak efficiency, and ultra-small 6-bump WLCSP (0.4 mm pitch) footprint for space-constrained designs.
Technical Context
The FAN4860UC33X implements variable on-time pulse frequency modulation (PFM) with automatic seamless transition between PWM and PFM modes to maintain high efficiency across light to heavy loads. Its current-mode control architecture delivers fast transient response and stable regulation under varying input and load conditions.
It integrates both N-channel boost switch (RDS(ON) = 300 mΩ) and P-channel synchronous rectifier (RDS(ON) = 400 mΩ), eliminating external diode requirements. Protection features include thermal shutdown (150 °C), overcurrent limiting (650–950 mA peak SW current), UVLO (2.2–2.3 V with 190 mV hysteresis), and true load disconnect during shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±3.3% (3.17–3.41 V) across 2.5–3.2 V input and 0–200 mA load - ensures stable core rail supply without external feedback resistors. |
| Input Voltage Range | 2.3 V to 3.2 V - matches single-cell Li-ion/Li-poly discharge profile, enabling full battery utilization down to 2.3 V cutoff. |
| Max Output Current | 300 mA at VIN = 2.7 V, VOUT = 3.3 V - supports moderate-power peripherals like USB OTG PHYs or low-power microcontrollers. |
| Switching Frequency | Up to 3 MHz in PWM mode - allows use of tiny 1 µH inductors and 0402/0603 capacitors, minimizing PCB area. |
| Quiescent Current | 50–65 µA (typical) at VIN = 2.7 V, IOUT = 0 - extends battery life in always-on or low-duty-cycle applications. |
| Shutdown Current | <1.5 µA - enables deep sleep states with negligible battery drain. |
| Efficiency | Up to 92% at 200 mA load and VIN = 3.0 V - reduces thermal stress and improves runtime in portable devices. |
Pinout & Package
Package: 6-bump Wafer-Level Chip Scale Package (WLCSP), 0.4 mm pitch, 1.2 × 1.2 mm footprint - optimized for ultra-compact portable layouts with minimal board area and thermal resistance (θJA = 130 °C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin A1) | Input power supply | Connects directly to Li-ion battery anode and input capacitor (CIN); supports 2.3–3.2 V operation with UVLO protection. |
| SW (Pin B1) | Switching node | Drives external 1 µH inductor; carries high-frequency pulsed current; requires tight layout to minimize EMI and losses. |
| EN (Pin C1) | Enable control | Active-high logic input (VENH ≥ 1.05 V); must be pulled high or driven externally - floating not allowed. |
| FB (Pin C2) | Feedback sense | Monitors regulated 3.3 V output via internal resistor divider; connects to COUT for stability and ripple filtering. |
| VOUT (Pin B2) | Regulated output | Delivers 3.3 V to load; also supplies internal bias - requires low-ESR ceramic capacitor (≥1.5 µF effective) for stability. |
| GND (Pin A2) | Power and signal ground | Single-point reference for all voltages; must be connected to low-impedance PCB ground plane beneath IC. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated P-channel MOSFET eliminates external Schottky diode, reducing conduction loss and board area. |
| True load disconnect | Zero reverse current flow from VOUT to VIN during shutdown - prevents battery drain through load path. |
| Light-load PFM mode | Automatic, glitch-free transition to variable-frequency operation below ~10 mA, maintaining regulation with only 37–65 µA quiescent current. |
| Thermal & overload protection | Auto-restart thermal shutdown at 150 °C (30 °C hysteresis) and cycle-by-cycle current limit (650–950 mA SW peak) prevent damage under fault conditions. |
| Ultra-small footprint | WLCSP-6 (1.2 × 1.2 mm, 0.4 mm pitch) enables placement in <1.5 mm² area - ideal for smartphones, wearables, and hearing aids. |
Applications
| USB OTG Power Supply | HDMI Interface Rail |
|---|---|
Use Scenario: Providing 3.3 V power to USB On-The-Go transceivers in smartphones or tablets when acting as host. IC Role / Device Role / Timing Role: Boost regulator supplying clean, regulated 3.3 V from declining Li-ion cell voltage (2.7–3.2 V). Use Value: Enables reliable OTG functionality across full battery range without external LDO post-regulation or larger inductors. |
Use Scenario: Powering HDMI 3.3 V auxiliary (AUX) or hot-plug detect (HPD) circuitry in portable media players or docking stations. IC Role / Device Role / Timing Role: Primary 3.3 V rail generator with fast transient response to handle HPD assertion spikes. Use Value: Meets HDMI specification's 3.3 V ±5% tolerance and 100 mA minimum current with <100 mV load step deviation. |
| Portable Instrument Core Rail | Smartphone Subsystem Supply |
Use Scenario: Delivering stable 3.3 V to microcontroller cores or sensor signal chains in handheld test equipment. IC Role / Device Role / Timing Role: Main system rail regulator with low-noise PFM/PWM hybrid operation and true shutdown isolation. Use Value: Maintains MCU operation down to 2.3 V battery voltage while consuming <65 µA quiescent current in standby. |
Use Scenario: Supplying 3.3 V to camera ISP, audio codec, or NFC controller in modern smartphones. IC Role / Device Role / Timing Role: Compact, high-efficiency boost stage placed near load to minimize IR drop and noise coupling. Use Value: Achieves >90% efficiency at 150–200 mA loads, reducing local heating and extending talk time by ~8% vs. legacy solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61291DRVR | Fixed 3.3 V output, 2.3–5.5 V input, 400 mA max, 1.2 MHz switching, WSON-6 (2 × 2 mm) | Larger package (2 × 2 mm vs. 1.2 × 1.2 mm), lower frequency limits inductor size flexibility; higher quiescent current (80 µA typical) | Preferred when higher output current or wider input range is required, but board area is less constrained. |
| MAX17222ELT+T | Adjustable or fixed 3.3 V output, 0.7–5.5 V input, 300 mA max, 2.5 MHz, 6-bump WLP (1.22 × 0.83 mm) | Smaller footprint (1.22 × 0.83 mm), lower min input (0.7 V), but no true load disconnect; FB pin requires external resistor for fixed 3.3 V | Selected for ultra-low-voltage harvesting or tighter area budgets where reverse current blocking is handled externally. |
Compared with TPS61291DRVR and MAX17222ELT+T, the FAN4860UC33X offers the smallest WLCSP footprint among 3.3 V boost regulators with true load disconnect, optimized for Li-ion systems operating strictly between 2.3–3.2 V, and delivers best-in-class light-load efficiency due to its ultra-low 50–65 µA quiescent current.
Availability
FAN4860UC33X is available at Aetrix Electronics and suitable for USB OTG power delivery, HDMI interface rails, portable instrument core supplies, and smartphone subsystem power requiring stable component supply, long-term lifecycle support, and consistent WLCSP packaging.
Supply support for FAN4860UC33X 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 (formerly Fairchild Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, and sensor solutions for automotive, industrial, and portable electronics.
The FAN4860 series belongs to ON Semiconductor's TinyBoost™ family of ultra-compact synchronous boost regulators, designed specifically for space- and battery-life-critical portable applications powered by single-cell Li-ion batteries.
FAQ
What is the output voltage accuracy of the FAN4860UC33X?
The FAN4860UC33X provides a fixed 3.3 V output with guaranteed accuracy of ±3.3% (3.17–3.41 V) across input voltages from 2.5 V to 3.2 V and load currents up to 200 mA. This tolerance is maintained over the full –40°C to +85°C operating temperature range and is specified in the Electrical Specifications table of the datasheet.
Does the FAN4860UC33X support true load disconnect during shutdown?
Yes, the FAN4860UC33X implements true load disconnect: when EN is pulled low, the internal switches isolate VIN from VOUT, preventing reverse current flow from the output capacitor or load back into the battery. This feature is confirmed in the Functional Description section and contributes to its sub-1.5 µA shutdown current.
What is the maximum output current the FAN4860UC33X can deliver at 2.7 V input?
At VIN = 2.7 V and VOUT = 3.3 V, the FAN4860UC33X delivers up to 300 mA of continuous DC output current, as specified in the Recommended Operating Conditions and Electrical Specifications tables. This value assumes proper thermal management and use of recommended external components (1 µH inductor, ≥4.7 µF COUT).
Which package type does the FAN4860UC33X use, and what are its dimensions?
The FAN4860UC33X uses a 6-bump Wafer-Level Chip Scale Package (WLCSP) with 0.4 mm pitch and a body size of 1.2 mm × 1.2 mm. This ultra-compact package is explicitly listed in the Ordering Information table and Pin Configurations section of the datasheet, and is distinct from the UMLP-6 variant used in other FAN4860 part numbers.
How does the FAN4860UC33X manage efficiency at light loads?
The FAN4860UC33X automatically transitions to pulse frequency modulation (PFM) mode under light loads (<10 mA), reducing switching frequency and maintaining regulation with only 37–65 µA quiescent current. This behavior is "glitch-free" and preserves output stability without external mode control, as detailed in the Functional Description and Typical Characteristics sections.
FAN4860UC33X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- TinyBoost®
- Package/Case:
- 6-UFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.3V
- Voltage - Input (Max):
- 3.2V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 650mA (Switch)
- Frequency - Switching:
- 3MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-WLCSP (1.23x0.88)
FAN4860UC33X FAQ
1.How can I place an order for FAN4860UC33X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN4860UC33X 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 FAN4860UC33X reliable?
The price and inventory of FAN4860UC33X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN4860UC33X is usually 5 days.
3.What payment methods are accepted for FAN4860UC33X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN4860UC33X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN4860UC33X?
FAN4860UC33X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN4860UC33X 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 FAN4860UC33X?
For technical support, including FAN4860UC33X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN4860UC33X requirements.
6.How does Aetrix verify that FAN4860UC33X is sourced from the original manufacturer or authorized distributors?
All FAN4860UC33X 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 FAN4860UC33X meets industry standards.
7.What is the process for return or replacement of FAN4860UC33X?
All FAN4860UC33X units undergo pre-shipment inspection (PSI). If there is an issue with FAN4860UC33X, 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 FAN4860UC33X part is unused and in its original packaging.
Return procedure for FAN4860UC33X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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