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onsemi FAN48611UC53X
- Part No.:
- FAN48611UC53X
- Manufacturer:
- onsemi
- Package:
- 9-UFBGA, WLCSP
- Datasheet:
-
FAN48611UC53X.pdf
- Description:
- IC REG BOOST 5.25V 350MA 9WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
FAN48611UC53X from onsemi is a fixed-output, synchronous boost regulator in a 9-bump WLCSP package, delivering 5.25 V at up to 350 mA from 2.7–4.8 V input. It features true load disconnect, short-circuit protection, and 2.5 MHz switching for compact Class-D audio and USB OTG power supplies in wearables and smartphones.
For engineers reviewing the FAN48611UC53X datasheet, pinout, applications, or equivalent options, key selection criteria include its 5.25 V regulated output, 2.5 MHz operation with valley-current limiting, integrated synchronous rectification, and WLCSP9 thermal performance under 350 mA load.
Technical Context
The FAN48611UC53X implements a current-mode modulator operating in Continuous Conduction Mode (CCM) at ~2.5 MHz and transitions to Discontinuous Conduction Mode (DCM) at light loads to maintain efficiency. Its startup sequence includes Linear (LIN), Soft-Start (SS), and Boost (BST) modes with automatic fault recovery.
It integrates an N-channel boost switch (RDS(ON) = 80 mΩ typ.) and P-channel synchronous rectifier (RDS(ON) = 65 mΩ typ.), supports true load disconnect during shutdown, and incorporates under-voltage lockout (2.2 V typ.), over-temperature protection (150°C), and valley-current limiting (750 mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.25 V ±4% DC accuracy - ensures stable USB OTG and Class-D amplifier rail compliance. |
| Input Range | 2.7 V to 4.8 V - supports full discharge curve of single-cell Li-ion and advanced chemistries. |
| Max Output Current | 350 mA continuous - sufficient for portable audio amplifiers and low-power peripheral boosting. |
| Switching Frequency | 2.0–3.0 MHz (2.5 MHz typ.) - enables use of small 1 µH inductors and minimizes EMI filtering area. |
| Quiescent Current | 90 µA typ. at 3.7 V - extends battery life in always-on wearable applications. |
| Thermal Resistance | θJA = 50 °C/W - validated on 4-layer JEDEC-compliant PCB, supports 125°C max junction temperature. |
| UVLO Threshold | 2.2 V rising, 150 mV hysteresis - prevents erratic startup during battery sag and ensures clean enable sequencing. |
Pinout & Package
Package: WLCSP9 (Case 567QW), 1.215 mm × 1.215 mm × 0.581 mm, 0.4 mm pitch, Pb-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (A1, A2) | Regulated output node | Direct connection point for output capacitor; dual pads reduce IR drop and improve current sharing. |
| VIN (A3) | Main power input | Battery supply input and gate driver bias source; must be decoupled near A3 with CIN. |
| SW (B1, B2) | Switching node | Connects to inductor; high di/dt path requiring minimal trace length and no vias to minimize ringing. |
| EN (B3) | Enable control input | Logic-compatible enable (VIH ≥ 1.2 V); internal pull-down ensures default disable on power-up. |
| PGND (C1, C2) | Power ground return | Low-impedance return for inductor current and output capacitor; shortest possible path to COUT required. |
| AGND (C3) | Analog reference ground | Signal ground for feedback and regulation circuitry; tied to PGND at single point to avoid noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated P-channel MOSFET reduces conduction loss vs. external diode, enabling >90% efficiency at 200 mA. |
| True load disconnect | Zero reverse leakage (<3.5 µA) and open-circuit VIN-to-VOUT path during shutdown - critical for system-level power gating. |
| Valley-current limiting | 750 mA peak limit with soft-start current reduction (375 mA) - prevents inrush damage during startup into large COUT. |
| 2.5 MHz fixed-frequency operation | Enables use of 1 µH, 2012-size inductors and 0402 ceramic capacitors - reduces solution footprint to <15 mm². |
| Multi-stage startup (LIN/SS/BST) | Linear pre-charge + controlled soft-start avoids brownout and ensures reliable regulation even with 3×10 µF COUT. |
Applications
| Class-D Audio Power Supply | USB OTG Host Supply |
|---|---|
Use Scenario: Portable Bluetooth speaker with integrated Class-D amplifier requiring 5 V rail from 3.7 V Li-ion cell. IC Role / Device Role / Timing Role: Primary voltage booster providing regulated 5.25 V output with fast transient response to handle dynamic audio peaks. Use Value: Delivers 350 mA at >90% efficiency across battery discharge range, eliminating need for external LDO post-regulation. | Use Scenario: Smartphone enabling USB On-The-Go to power peripherals like flash drives or keyboards. IC Role / Device Role / Timing Role: Dedicated 5 V boost converter activated only during OTG mode, with true load disconnect to prevent backfeed. Use Value: Meets USB 2.0 5 V ±5% spec with <±30 mV load transient deviation and <30 mV ripple at full 350 mA load. |
| Smartphone Main Boost Rail | Wearable Sensor Hub Supply |
Use Scenario: Mid-tier smartphone using single-cell battery to power camera flash IC or display backlight drivers. IC Role / Device Role / Timing Role: High-efficiency, space-constrained boost stage with integrated power switches and minimal external components. Use Value: Achieves 92% efficiency at 300 mA with 2.5 MHz switching, reducing inductor size and easing EMI filter design. | Use Scenario: Fitness tracker with optical heart-rate sensor requiring stable 5 V supply during motion-induced battery voltage sag. IC Role / Device Role / Timing Role: Low-quiescent (90 µA), UVLO-protected boost regulator maintaining regulation down to 2.7 V input. Use Value: Sustains sensor operation during deep discharge without brownout, supported by 150 mV UVLO hysteresis. |
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 5.0 V output, 1.2 MHz switching, 400 mA max, 5-pin SOT-23 package | Larger footprint, lower frequency requires larger inductor; lacks true load disconnect and valley-current limiting | Choose when board space allows SOT-23 and 5.0 V (not 5.25 V) suffices for USB compliance |
| MAX17222ELT+T | Adjustable output (0.6–5.25 V), 2.5 MHz, 500 mA, 6-bump WLP package | Requires external feedback resistors; higher max current but no integrated EN pull-down or LIN-mode pre-charge | Choose when output voltage flexibility or higher current headroom is needed, accepting added BOM complexity |
Compared with TPS61291DRVR and MAX17222ELT+T, the FAN48611UC53X offers tighter 5.25 V output accuracy, integrated linear pre-charge for robust startup into large capacitance, and true load disconnect - making it optimal for space-constrained, battery-sensitive USB OTG and audio applications where rail precision and zero-backfeed are mandatory.
Availability
FAN48611UC53X is available at Aetrix Electronics and suitable for portable audio systems, USB OTG host implementations, and wearable sensor hubs requiring stable component supply with guaranteed long-term manufacturability.
Supply support for FAN48611UC53X 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient electronics, serving automotive, industrial, cloud, and consumer markets with power, analog, sensing, and connectivity solutions.
The FAN48611UC53X belongs to onsemi's TINYBOOST family - designed specifically for ultra-compact, high-frequency boost conversion in battery-powered portable devices where minimal external components and WLCSP packaging are essential.
FAQ
What is the output voltage tolerance of the FAN48611UC53X?
The FAN48611UC53X provides a fixed 5.25 V output with ±4% DC accuracy over temperature and load (−40°C to +85°C, 0–350 mA). This specification is measured at the VOUT pins under recommended operating conditions and accounts for line, load, and temperature variation - ensuring compatibility with USB 2.0 and Class-D amplifier input requirements without additional regulation.
Does the FAN48611UC53X support true load disconnect during shutdown?
Yes, the FAN48611UC53X provides true load disconnect: when EN is low, it presents a high-impedance path between VIN and VOUT, with reverse leakage limited to ≤3.5 µA at VOUT = 5.3 V and VIN = 2.7 V. This prevents backfeed into the battery and enables clean system-level power sequencing - a key differentiator versus basic boost regulators lacking integrated isolation.
What is the minimum input voltage required for the FAN48611UC53X to start regulating?
The FAN48611UC53X begins startup when VIN exceeds the under-voltage lockout (UVLO) threshold of 2.2 V (typical, with 150 mV hysteresis). Below this, the device remains in shutdown with near-zero quiescent current (2.7 µA typ.). Once enabled, its LIN-mode pre-charge can lift VOUT even if VIN is below 5.25 V - allowing regulation from deeply discharged Li-ion cells down to 2.7 V nominal input.
Can the FAN48611UC53X drive a 350 mA load continuously at 85°C ambient?
Yes, the FAN48611UC53X is rated for 350 mA continuous output current across −40°C to +85°C ambient, provided the PCB layout meets JEDEC 4-layer thermal guidelines (θJA = 50 °C/W). At 85°C ambient and full load, junction temperature remains within the 125°C limit due to its low RDS(ON) switches and efficient synchronous topology - confirmed by thermal characterization in the official datasheet.
What external components are required for basic operation of the FAN48611UC53X?
The FAN48611UC53X requires only three external components: a 1 µH, 2012-size inductor (e.g., PIXC20120F1R0MDR), and two 10 µF, 0402-case X5R ceramic capacitors - one for input (CIN) and one for output (COUT). No feedback resistors, compensation networks, or external MOSFETs are needed, enabling a total solution size under 15 mm² - consistent with its TINYBOOST designation and WLCSP9 footprint.
FAN48611UC53X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- TinyBoost®
- Package/Case:
- 9-UFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Last Time Buy
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 4.8V
- Voltage - Output (Min/Fixed):
- 5.25V
- Voltage - Output (Max):
- -
- Current - Output:
- 350mA
- Frequency - Switching:
- 2.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 9-WLCSP (1.22x1.22)
FAN48611UC53X FAQ
1.How can I place an order for FAN48611UC53X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN48611UC53X 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 FAN48611UC53X reliable?
The price and inventory of FAN48611UC53X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN48611UC53X is usually 5 days.
3.What payment methods are accepted for FAN48611UC53X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN48611UC53X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN48611UC53X?
FAN48611UC53X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN48611UC53X 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 FAN48611UC53X?
For technical support, including FAN48611UC53X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN48611UC53X requirements.
6.How does Aetrix verify that FAN48611UC53X is sourced from the original manufacturer or authorized distributors?
All FAN48611UC53X 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 FAN48611UC53X meets industry standards.
7.What is the process for return or replacement of FAN48611UC53X?
All FAN48611UC53X units undergo pre-shipment inspection (PSI). If there is an issue with FAN48611UC53X, 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 FAN48611UC53X part is unused and in its original packaging.
Return procedure for FAN48611UC53X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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