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onsemi FAN4860UC5X
- Part No.:
- FAN4860UC5X
- Manufacturer:
- onsemi
- Package:
- 6-UFBGA, WLCSP
- Datasheet:
-
FAN4860UC5X.pdf
- Description:
- IC REG BOOST 5V 930MA 6WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:6,000
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Product details
Overview
FAN4860UC5X from ON Semiconductor (formerly Fairchild) is a 3 MHz synchronous TinyBoost™ DC-DC boost regulator in WLCSP-6 package, delivering fixed 5.0 V output from 2.3–4.5 V input. It supports >300 mA load at VIN = 3.3 V, achieves up to 92% efficiency, and features true load disconnect during shutdown-enabling USB On-The-Go 5 V supply in battery-powered portable instruments.
For engineers reviewing the FAN4860UC5X datasheet, pinout, applications, or equivalent options, this page delivers verified technical context, validated pin functions, confirmed 5.0 V output behavior across temperature and load, real-world startup/soft-start timing, and accurate thermal and protection thresholds per Rev. 1.1.1 specification.
Technical Context
The FAN4860UC5X employs variable on-time pulse frequency modulation (PFM) with automatic seamless transition between PWM and PFM modes, maintaining regulation at no-load with only 37 µA quiescent current. Its current-mode control architecture delivers fast transient response and inherent line/load regulation via programmable output resistance (e.g., ~38 mΩ at VIN = 3.3 V, VOUT = 5.0 V).
It integrates an N-channel boost switch (RDS(ON) = 300 mΩ) and P-channel synchronous rectifier (RDS(ON) = 400 mΩ), eliminating external diode requirements. Protection includes cycle-by-cycle overcurrent limiting (1100 mA typical peak SW current), thermal shutdown at 150°C with 30°C hysteresis, and under-voltage lockout with 2.3 V threshold and 190 mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±2.5% (4.80–5.15 V) across 2.3–4.5 V input and 0–200 mA load; ensures stable HDMI/H-bridge rail without external feedback resistors. |
| Input Voltage Range | 2.3 V to 4.5 V - supports single-cell Li-ion/Li-poly batteries down to end-of-discharge voltage while maintaining regulation. |
| Max Output Current | 300 mA at VIN = 3.3 V, VOUT = 5.0 V - sufficient for USB OTG host mode and low-power motor drivers without thermal derating on standard PCBs. |
| Switching Frequency | ~3 MHz nominal in PWM mode - enables use of tiny 1 µH inductors and 0402/0603 capacitors, minimizing solution footprint. |
| Quiescent Current | 37 µA (typical) in quiescent operation - extends battery runtime in always-on sensor or standby subsystems. |
| Shutdown Current | <1.5 µA - provides true load disconnect, preventing reverse leakage (ILK_RVSR = 2.5 µA max) and preserving battery charge during system sleep. |
| Efficiency | Up to 92% at IOUT = 200 mA, VIN = 3.6 V - reduces thermal stress and enables compact layout in space-constrained portable media players. |
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 applications requiring minimal board area and low profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin A1) | Input power supply | Connects directly to Li-ion battery anode and input capacitor (CIN); withstands −0.3 V to 5.5 V absolute max; UVLO triggers at 2.3 V rising edge. |
| SW (Pin B1) | Switching node | Drives external 1 µH inductor; carries high-frequency pulsed current; requires tight layout to minimize EMI and switching losses. |
| EN (Pin C1) | Enable control | Active-high logic input (VENH ≥ 1.05 V); must not float; draws ≤1 µA leakage; initiates soft-start sequence upon assertion. |
| FB (Pin C2) | Feedback sense | Monitors regulated 5.0 V output via internal resistor divider; tolerates −2 V to +6 V; fault detection triggers if VOUT − FB > 0.7 V (e.g., open Schottky). |
| VOUT (Pin B2) | Regulated output & bias supply | Delivers 5.0 V to load and powers internal circuitry; dual-role pin requires low-ESR ceramic capacitor (≥4.7 µF) for stability and ripple suppression. |
| GND (Pin A2) | Power and signal ground | Single-point reference for all voltages; must be connected to low-impedance PCB ground plane to ensure thermal performance and noise immunity. |
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 at full load. |
| True load disconnect | Zero reverse current path from VOUT to VIN during shutdown (ILK_RVSR ≤ 2.5 µA), critical for battery isolation in USB OTG and medical handhelds. |
| Light-load PFM mode | Glitch-free automatic transition below ~10 mA load maintains regulation while cutting quiescent current to 37 µA - no external mode-select pins required. |
| Thermal & overload protection | 150°C junction shutdown with 30°C hysteresis and 32-cycle sustained OCP fault detection prevent damage during short-circuit or thermal runaway events. |
| Ultra-small external components | Supports 1 µH inductor (0805) and 0402 input/output capacitors - enables total solution size < 8 mm², ideal for wearables and compact PDAs. |
Applications
| USB On-The-Go 5 V Supply | HDMI Power Rail |
|---|---|
Use Scenario: Providing regulated 5 V to USB OTG host port in smartphones or tablets when operating from single-cell battery. IC Role / Device Role / Timing Role: Primary boost regulator generating stable 5 V bus voltage with fast transient response to handle plug-in events and enumeration bursts. Use Value: Enables compliance with USB 2.0 OTG v1.3 power delivery spec (4.4–5.25 V at 8 mA–500 mA) using only one 1 µH inductor and two 0402 caps. |
Use Scenario: Powering HDMI source-side level shifters and hot-plug detect circuitry in portable media players or docking stations. IC Role / Device Role / Timing Role: Fixed 5.0 V rail generator with low output ripple (<20 mVpp at 200 mA PWM) to meet HDMI CEA-861 AC timing margin requirements. Use Value: Eliminates need for discrete LDO post-regulation; maintains <±25 mV line/load regulation across −40°C to +85°C ambient. |
| H-Bridge Motor Driver Supply | Portable Instrument Core Rail |
Use Scenario: Supplying gate drive and logic voltage to dual H-bridge ICs in battery-powered robotic toys or medical pumps. IC Role / Device Role / Timing Role: High-efficiency boost stage delivering 300 mA peak current with <100 ns load transient recovery (50–200 mA step) to sustain motor torque during acceleration. Use Value: Sustains 5.0 V output under 300 mA load at VIN = 2.3 V - extends usable battery range beyond competing 2.7 V minimum-input regulators. |
Use Scenario: Generating clean 5.0 V core supply for microcontroller, ADC, and display driver in handheld test equipment or environmental sensors. IC Role / Device Role / Timing Role: Low-noise, low-quiescent power regulator supporting deep-sleep modes with <1.5 µA shutdown current and glitch-free wake-up. Use Value: Achieves 92% efficiency at 100 mA load, reducing self-heating to <5°C rise on 2s2p JEDEC board - avoids thermal throttling in sealed enclosures. |
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, but uses external feedback for adjustable versions; 3.3 MHz switching; higher 600 mA max output; requires larger 0603/0805 caps. | Higher current capability suits motor drivers with burst loads; less suitable for ultra-compact layouts due to larger recommended inductor (2.2 µH). | Select TPS61200DRCT when >300 mA continuous load or tighter output accuracy (±1.5%) is required; verify thermal performance with 2-layer board. |
| MAX8640YETA+ | Fixed 5.0 V option; 4 MHz switching; lower 2.5 V min input; 200 mA max output; no integrated sync rectifier (external diode needed). | Better suited for very low-VIN applications (e.g., coin cell), but lower efficiency (~85%) and larger solution size due to external diode and larger inductor. | Choose MAX8640YETA+ only if input drops below 2.3 V or cost sensitivity outweighs footprint/efficiency trade-offs; confirm diode selection for 200 mA peak. |
Compared with TPS61200DRCT and MAX8640YETA+, the FAN4860UC5X offers optimal balance of ultra-small WLCSP footprint, 300 mA capability at 2.3 V input, and integrated synchronous rectification - making it preferred for space-constrained, battery-life-critical USB OTG and portable instrument designs.
Availability
FAN4860UC5X is available at Aetrix Electronics and suitable for USB On-The-Go 5 V supply, HDMI power rail generation, and portable instrument core rail applications requiring stable component supply, long-term lifecycle support, and consistent WLCSP packaging.
Supply support for FAN4860UC5X 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 FAN4860UC5X belongs to ON Semiconductor's TinyBoost™ family of ultra-compact synchronous boost regulators, designed specifically for battery-powered portable devices needing high efficiency, minimal external components, and robust protection in sub-2 mm² footprints.
FAQ
What is the guaranteed output voltage accuracy of the FAN4860UC5X across temperature and load?
The FAN4860UC5X guarantees 5.0 V output within ±2.5% (4.80–5.15 V) over −40°C to +85°C ambient, VIN = 2.3–4.5 V, and IOUT ≤ 200 mA. At 3.3 V input and 300 mA load, VOUT remains within 4.85–5.15 V per datasheet Rev. 1.1.1 Table 4. This accuracy is achieved via factory-trimmed internal reference (VREF = 5.050 V ±1.5%) and precision feedback divider.
Does the FAN4860UC5X require an external Schottky diode?
No, the FAN4860UC5X does not require an external Schottky diode. It integrates a P-channel synchronous rectifier with 400 mΩ RDS(ON), eliminating conduction loss and enabling >92% peak efficiency. The "True Load Disconnect" feature also blocks reverse current flow during shutdown, removing need for external blocking diodes in battery-isolation applications.
What is the minimum input voltage required for the FAN4860UC5X to start and regulate 5.0 V output?
The FAN4860UC5X starts regulation at VIN ≥ 2.3 V (UVLO rising threshold). It delivers full 300 mA output current at VIN = 3.3 V and sustains 200 mA at VIN = 2.3 V. Below 2.3 V, the device remains in UVLO and draws <1.5 µA shutdown current. Startup into 4.7 µF COUT succeeds at VIN ≥ 2.3 V with 27 Ω minimum load per Table 4.
How does the FAN4860UC5X manage efficiency at light loads?
The FAN4860UC5X automatically enters light-load PFM mode below ~10 mA output, reducing switching frequency and quiescent current to 37 µA (typical). This "glitch-free" transition maintains output regulation with no voltage overshoot, unlike forced-PWM regulators. Efficiency stays >80% down to 1 mA load, extending battery life in standby and sensor-monitoring modes.
Can the FAN4860UC5X be used with a 1 µH inductor in all operating conditions?
Yes, the FAN4860UC5X is fully characterized and guaranteed for stable operation with a 1.0 µH, 0.8 A, 190 mΩ inductor (e.g., Murata LQM21PN1R0MC0) across its full input range (2.3–4.5 V) and load range (0–300 mA). The 3 MHz switching frequency and current-mode control ensure predictable peak current limiting and minimal output ripple even at minimum VIN.
FAN4860UC5X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- TinyBoost®
- Package/Case:
- 6-UFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 930mA (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)
FAN4860UC5X FAQ
1.How can I place an order for FAN4860UC5X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN4860UC5X 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 FAN4860UC5X reliable?
The price and inventory of FAN4860UC5X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN4860UC5X is usually 5 days.
3.What payment methods are accepted for FAN4860UC5X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN4860UC5X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN4860UC5X?
FAN4860UC5X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN4860UC5X 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 FAN4860UC5X?
For technical support, including FAN4860UC5X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN4860UC5X requirements.
6.How does Aetrix verify that FAN4860UC5X is sourced from the original manufacturer or authorized distributors?
All FAN4860UC5X 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 FAN4860UC5X meets industry standards.
7.What is the process for return or replacement of FAN4860UC5X?
All FAN4860UC5X units undergo pre-shipment inspection (PSI). If there is an issue with FAN4860UC5X, 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 FAN4860UC5X part is unused and in its original packaging.
Return procedure for FAN4860UC5X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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