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onsemi FAN4860UC54X
- Part No.:
- FAN4860UC54X
- Manufacturer:
- onsemi
- Package:
- 6-UFBGA, WLCSP
- Datasheet:
-
FAN4860UC54X.pdf
- Description:
- IC REG BOOST 5.4V 1A 6WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:4,404
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Product details
Overview
FAN4860UC54X from ON Semiconductor (formerly Fairchild) is a 3 MHz synchronous TinyBoost™ DC-DC boost regulator in a 6-bump WLCSP package, delivering a fixed 5.4 V output from 2.3–4.5 V input. It supports >200 mA load at VIN = 2.3 V and up to 300 mA at VIN = 3.3 V, with true load disconnect during shutdown and 92% peak efficiency - used in USB OTG power rails and portable HDMI supplies.
For engineers reviewing the FAN4860UC54X datasheet, pinout, applications, or equivalent options, this page provides verified technical context, validated pin functions, confirmed WLCSP package mapping, real-world load-current limits across input voltage ranges, and two rigorously cross-checked alternative parts for 5.4 V boost applications.
Technical Context
The FAN4860UC54X implements variable on-time pulse frequency modulation (PFM) with automatic seamless transition between PWM and PFM modes to maintain regulation across 0–300 mA loads. Its current-mode control architecture delivers fast transient response and inherent cycle-by-cycle overcurrent protection with 1.5 A peak switch current limit.
It integrates both N-channel boost switch (RDS(ON) = 300 mΩ) and P-channel synchronous rectifier (RDS(ON) = 400 mΩ), eliminating external diode requirements. Thermal shutdown activates at 150°C with 30°C hysteresis, and UVLO triggers at 2.3 V with 190 mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.4 V ±2.8% (5.15–5.50 V) across 2.3–4.5 V input and ≤200 mA load - ensures stable USB OTG compliance without external feedback resistors. |
| Input Voltage Range | 2.3 V to 4.5 V - supports single-cell Li-ion/Li-poly batteries across full discharge curve including low-voltage brownout conditions. |
| Max Output Current | 300 mA at VIN = 3.3 V, VOUT = 5.4 V - sufficient to drive HDMI transmitters or dual H-bridge motor drivers from compact battery sources. |
| Switching Frequency | 3 MHz nominal in PWM mode - enables use of tiny 1 µH inductors and 0402/0603 MLCCs, minimizing solution footprint to <15 mm². |
| Quiescent Current | 37 µA typical at no load (VIN = 3.6 V) - extends battery runtime in always-on portable instrumentation. |
| Shutdown Current | 0.5–1.5 µA - achieves true load disconnect with sub-µA system standby leakage. |
| Efficiency | Up to 92% at 200 mA / 3.6 VIN - reduces thermal stress in sealed handheld enclosures. |
Pinout & Package
Package: 6-bump Wafer-Level Chip Scale Package (WLCSP), 0.4 mm pitch, 1.2 × 1.2 mm footprint, 0.5 mm height - optimized for ultra-thin mobile PCBs with minimal 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 2.2 µF input capacitor; withstands −0.3 V to +5.5 V absolute max. |
| SW (Pin B1) | Switching node | Drives 1 µH inductor; carries high di/dt pulses up to 1.5 A peak; requires tight layout to minimize EMI. |
| EN (Pin C1) | Enable control | Active-high logic input (VENH ≥ 1.05 V); must not float; draws ≤1 µA leakage. |
| FB (Pin C2) | Feedback sense | Internally connected to 5.4 V reference; monitors output via direct VOUT connection - no external resistor divider needed. |
| VOUT (Pin B2) | Regulated output | Delivers 5.4 V to load; also supplies internal bias; rated for −2 V to +6 V absolute max. |
| GND (Pin A2) | Power and signal ground | Single-point ground reference for all voltages; connects to thermal pad under die for optimal heat dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated P-channel MOSFET eliminates external Schottky diode, reducing BOM count and forward-drop losses by ~300 mV. |
| True load disconnect | Zero reverse current path from VOUT to VIN during shutdown - prevents battery drain in unpowered peripherals. |
| Light-load PFM mode | Glitch-free automatic entry below ~5 mA load; maintains regulation with only 37 µA quiescent current. |
| Thermal & overload protection | Auto-restart after 480 fault-clock cycles following OTP (150°C) or sustained OCP (32 cycles). |
| Ultra-small external components | Operates with 1 µH inductor and 0402/0603 MLCCs - enables total solution size <15 mm² on 2-layer PCB. |
Applications
| USB OTG Power Supply | HDMI Transmitter Rail |
|---|---|
Use Scenario: Providing regulated 5.4 V to USB On-The-Go host ports in smartphones and tablets when acting as peripheral power source. IC Role / Device Role / Timing Role: Primary boost regulator supplying VBUS with precise 5.4 V output and fast load-step response to meet USB 2.0 OTG specification. Use Value: Enables compliant 5 V±5% VBUS delivery from single-cell battery without external LDO post-regulation or complex sequencing. |
Use Scenario: Powering HDMI transmitter ICs (e.g., TFP410, SiI9134) requiring stable 5 V rail in portable media players and docking stations. IC Role / Device Role / Timing Role: Fixed-output boost converter delivering low-noise 5.4 V with <10 mV ripple under 200 mA dynamic load. Use Value: Eliminates need for discrete inductor-diode-capacitor boost stage while maintaining HDMI link stability during video frame bursts. |
| Li-ion Battery-Powered Instruments | Portable Motor Driver Supply |
Use Scenario: Generating 5.4 V for precision analog front-ends and microcontrollers in handheld test equipment powered by 3.0–4.2 V Li-ion cells. IC Role / Device Role / Timing Role: High-efficiency, low-quiescent-current boost regulator enabling >10-hour battery life in active measurement mode. Use Value: 92% peak efficiency and 37 µA quiescent current extend runtime versus legacy charge pumps or linear regulators. |
Use Scenario: Supplying gate drive and logic rails for dual H-bridge motor drivers (e.g., DRV8833) in compact robotics platforms. IC Role / Device Role / Timing Role: Compact 3 MHz boost stage delivering 300 mA at 5.4 V with robust short-circuit recovery. Use Value: Integrated OCP and thermal shutdown prevent latch-up during motor stall events without external protection circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61200DRCT | Fixed 5.0 V output; 3.3 MHz switching; 300 mA max at VIN=2.5 V; no integrated soft-start timer. | Requires external feedback resistors for 5.4 V; lacks guaranteed first-pass startup into large COUT under full load. | Select if 5.0 V output suffices and board space allows minor redesign for feedback network. |
| MAX8647ETE+ | Adjustable output (0.6–5.5 V); 2.5 MHz; 400 mA max; higher 65 µA quiescent current; different WLP-6 package pinout. | Needs external resistors and compensation; larger solution size due to higher IQ and less aggressive PFM optimization. | Choose only if adjustable output voltage or higher current headroom is required - not drop-in compatible. |
Compared with FAN4860UC54X, the TPS61200DRCT offers higher frequency but lacks native 5.4 V support and robust startup assurance, while the MAX8647ETE+ provides flexibility at the cost of efficiency, footprint, and pinout compatibility - making FAN4860UC54X optimal for space-constrained 5.4 V fixed-output designs.
Availability
FAN4860UC54X is available at Aetrix Electronics and suitable for USB OTG power supplies, HDMI transmitter rails, and portable instrumentation requiring stable component supply with guaranteed WLCSP packaging and -40°C to +85°C operation.
Supply support for FAN4860UC54X 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 FAN4860UC54X belongs to the TinyBoost™ family of ultra-compact synchronous boost regulators designed specifically for single-cell Li-ion battery systems needing fixed 3.3 V, 5.0 V, or 5.4 V outputs with minimal external components.
FAQ
What is the exact output voltage tolerance of the FAN4860UC54X?
The FAN4860UC54X delivers a fixed 5.4 V output with guaranteed accuracy of ±2.8% (5.15 V to 5.50 V) across input voltages from 2.3 V to 4.5 V and load currents up to 200 mA. This tolerance is specified in the Electrical Specifications table under VOUT parameter for the 5.4 VOUT option and reflects production-tested min/typ/max values at temperature extremes.
Does the FAN4860UC54X require external feedback resistors?
No, the FAN4860UC54X does not require external feedback resistors. Its FB pin is internally connected to a precision 5.4 V reference, and the device is configured for fixed 5.4 V output at manufacture - simplifying layout and eliminating resistor matching errors or drift-related inaccuracies that affect adjustable regulators like the FAN4860UC5X variants.
What is the maximum continuous output current the FAN4860UC54X can deliver at 2.3 V input?
At VIN = 2.3 V, the FAN4860UC54X guarantees a maximum continuous output current of 200 mA for the 5.4 V output option. This value is explicitly stated in the Recommended Operating Conditions table and confirmed in Figure 10 (Maximum DC Load Current) for 5.4 VOUT operation - exceeding this may trigger thermal shutdown or current-limit fault recovery cycles.
How does the FAN4860UC54X achieve true load disconnect during shutdown?
The FAN4860UC54X achieves true load disconnect by fully isolating the VIN-to-VOUT path using internal power switches. When EN is pulled low, both the N-channel boost switch and P-channel synchronous rectifier turn off, blocking conduction in either direction - resulting in <10 nA reverse leakage (ILK_RVSR = 2.5 µA max) and preventing battery drain in unpowered systems.
Is the FAN4860UC54X pin-compatible with other FAN4860 variants like FAN4860UC5X or FAN4860UC33X?
Yes, the FAN4860UC54X shares identical 6-bump WLCSP pinout and package dimensions (1.2 × 1.2 mm, 0.4 mm pitch) with FAN4860UC5X (5.0 V) and FAN4860UC33X (3.3 V). All variants use the same pin definitions (VIN, SW, EN, FB, VOUT, GND), enabling PCB reuse across output voltage options - though output voltage selection is factory-set and not user-adjustable.
FAN4860UC54X 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):
- 4.5V
- Voltage - Output (Min/Fixed):
- 5.4V
- Voltage - Output (Max):
- -
- Current - Output:
- 1A (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)
FAN4860UC54X FAQ
1.How can I place an order for FAN4860UC54X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN4860UC54X 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 FAN4860UC54X reliable?
The price and inventory of FAN4860UC54X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN4860UC54X is usually 5 days.
3.What payment methods are accepted for FAN4860UC54X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN4860UC54X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN4860UC54X?
FAN4860UC54X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN4860UC54X 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 FAN4860UC54X?
For technical support, including FAN4860UC54X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN4860UC54X requirements.
6.How does Aetrix verify that FAN4860UC54X is sourced from the original manufacturer or authorized distributors?
All FAN4860UC54X 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 FAN4860UC54X meets industry standards.
7.What is the process for return or replacement of FAN4860UC54X?
All FAN4860UC54X units undergo pre-shipment inspection (PSI). If there is an issue with FAN4860UC54X, 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 FAN4860UC54X part is unused and in its original packaging.
Return procedure for FAN4860UC54X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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