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onsemi FAN48618BUC53X
- Part No.:
- FAN48618BUC53X
- Manufacturer:
- onsemi
- Package:
- 9-UFBGA, WLCSP
- Datasheet:
-
FAN48618BUC53X.pdf
- Description:
- IC REG BOOST 5.25V 1.2A 9WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:11,986
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Product details
Overview
FAN48618BUC53X from onsemi is a 2.5 MHz fixed-output synchronous TinyBoost regulator designed to generate a stable 5.25 V rail from single-cell Li-ion batteries (2.7–4.8 V input), enabling USB OTG and Class-D audio supply in space-constrained portable devices. It integrates N- and P-channel power switches, supports true load disconnect, and delivers up to 1.2 A output current at 3.0 V input.
For engineers reviewing the FAN48618BUC53X datasheet, pinout, applications, or equivalent options, key selection criteria include its 2.5 MHz switching frequency, 9-bump WLCSP package, 5.25 V fixed output, under-voltage lockout at 2.2 V, and integrated synchronous rectification for high efficiency in battery-powered wearables and smartphones.
Technical Context
The FAN48618BUC53X employs current-mode control with valley-current limiting and operates in Continuous Conduction Mode (CCM) at ~2.5 MHz under moderate-to-heavy loads, transitioning to variable-frequency DCM at light loads to maintain efficiency. Its startup sequence includes Linear (LIN), Soft-Start (SS), and Boost (BST) modes, with automatic fault recovery after 20 ms.
It features dual ground domains-PGND for power return and AGND as analog reference-requiring single-point connection. Protection includes over-temperature shutdown at 150°C (20°C hysteresis), short-circuit protection, and true load disconnect during shutdown to prevent reverse leakage (<3.5 µA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.25 V ±4% DC accuracy ensures stable USB OTG and audio amplifier biasing without external feedback. |
| Switching Frequency | 2.5 MHz typical enables compact 0.47 µH inductor and small 0402/0603 capacitors for ultra-thin mobile designs. |
| Input Voltage Range | 2.7 V to 4.8 V supports full discharge of Li-ion cells while maintaining regulation below system brownout thresholds. |
| Max Output Current | 1200 mA at VIN ≥ 3.0 V enables driving Class-D amplifiers and USB peripherals directly from battery. |
| Quiescent Current | 90 µA typical at 3.6 V minimizes standby drain in always-on wearable sensors and low-power subsystems. |
| UVLO Threshold | 2.2 V rising with 150 mV hysteresis prevents oscillation during battery sag and enables graceful shutdown before critical voltage collapse. |
| RDS(ON) (N/P) | 80 mΩ / 65 mΩ typical reduces conduction loss and thermal rise in 1.215 mm × 1.215 mm WLCSP footprint. |
Pinout & Package
Package: 9-bump Wafer-Level Chip-Scale Package (WLCSP), 1.215 mm × 1.215 mm × 0.581 mm, 0.4 mm pitch, case 567QW.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (A1, A2) | Regulated output node | Direct connection point for 22 µF output capacitor; must be routed with minimal trace length to PGND for ripple suppression. |
| VIN (A3) | Battery input and gate drive bias source | Supplies internal logic and switch drivers; requires local 4.7 µF input capacitor to stabilize during pulsed load transients. |
| SW (B1, B2) | Internal boost switch node | Connects to 0.47 µH inductor; high di/dt path requiring tight loop area to minimize EMI and voltage overshoot. |
| EN (B3) | Logic-enable control input | Active-HIGH enable with 1.2 V VIH threshold; internal 300 kΩ pull-down ensures safe default-off state. |
| PGND (C1, C2) | Power ground return | Primary return path for inductor current and output capacitor; must connect to COUT ground via shortest possible path. |
| AGND (C3) | Analog reference ground | Signal reference for error amplifier and UVLO comparator; tied to PGND at single point near IC to avoid noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated P-channel MOSFET replaces external Schottky diode, eliminating 300–400 mV forward drop and improving efficiency by >8% at 500 mA. |
| True load disconnect | High-impedance isolation between VIN and VOUT during shutdown prevents battery drain from downstream circuits and reverse leakage <3.5 µA. |
| Three-component solution | Only requires 0.47 µH inductor, 4.7 µF input cap, and 22 µF output cap-enabling <1.5 mm² total passive area in smartphone bezel designs. |
| 2.5 MHz fixed-frequency operation | Enables use of miniature 2012-size inductors and avoids AM radio band interference, simplifying EMI filtering in RF-sensitive layouts. |
| Linear startup mode | Internal current-limited charge path brings VOUT within 300 mV of VIN before switching begins, preventing inrush-induced brownout in systems with large output capacitance. |
Applications
| Class-D Audio Amplifier Supply | USB OTG Power Delivery |
|---|---|
Use Scenario: Powering mono/stereo Class-D audio amplifiers in smartphones and wireless earbuds where battery voltage drops below 3.3 V. IC Role / Device Role / Timing Role: Fixed 5.25 V boost regulator providing clean, low-noise rail independent of battery state-of-charge. Use Value: Enables consistent amplifier output power and THD+N performance across full 2.7–4.8 V battery range without requiring system-level voltage scaling. | Use Scenario: Supplying 5 V to USB On-The-Go peripherals (keyboards, flash drives) from a single Li-ion cell in tablets and portable hubs. IC Role / Device Role / Timing Role: High-efficiency synchronous boost converter with fast transient response to handle USB enumeration surges. Use Value: Delivers regulated 5.25 V at up to 1.2 A with <25 mV ripple, meeting USB 2.0 voltage tolerance and avoiding host negotiation failures. |
| Smartphone Main Camera Flash | Wearable Health Sensor Bias |
Use Scenario: Driving white LED flash arrays requiring >5 V from low-voltage battery in slim smartphone camera modules. IC Role / Device Role / Timing Role: Compact boost regulator with true load disconnect to isolate flash circuitry when inactive. Use Value: Eliminates need for external load switch; <3.5 µA reverse leakage preserves battery life during standby between photo sessions. | Use Scenario: Providing stable 5.25 V bias to low-power analog front-ends (ECG, SpO₂) in continuous-wear medical wearables. IC Role / Device Role / Timing Role: Ultra-low-quiescent-current (90 µA) boost regulator supporting multi-week battery life in always-on sensing. Use Value: Maintains regulation down to 2.7 V input while consuming less than 0.3 µW average standby power per sensor channel. |
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, 1.5 A max, 12-bump WLCSP (1.63 × 1.63 mm) | Larger footprint and lower frequency limit its use in ultra-thin bezel designs requiring 2.5 MHz EMI avoidance. | Select when higher output current headroom and lower quiescent current (5 µA shutdown) outweigh size and frequency constraints. |
| MAX17222ETA+T | Adjustable output (2.0–5.25 V), 2.5 MHz, 1 A max, 6-bump WLCSP (1.22 × 0.84 mm) | Lacks true load disconnect and has higher RDS(ON) (120 mΩ), increasing conduction loss in high-duty-cycle applications. | Select when output voltage flexibility is required and reverse leakage tolerance exceeds 10 µA. |
Compared with FAN48618BUC53X, TPS61291DRVR offers higher current but larger size and lower frequency, while MAX17222ETA+T provides adjustable output but sacrifices load isolation and efficiency-making FAN48618BUC53X optimal for fixed 5.25 V, space-constrained, low-leakage USB/audio applications.
Availability
FAN48618BUC53X is available at Aetrix Electronics and suitable for smartphone camera flash, wearable health sensor bias, and USB OTG power delivery requiring stable component supply, long-term lifecycle support, and wafer-level packaging compatibility with automated SMT assembly.
Supply support for FAN48618BUC53X 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 (Semiconductor Components Industries, LLC) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The FAN48618BUC53X belongs to onsemi's TinyBoost family-designed specifically for ultra-compact, high-frequency boost conversion in battery-powered portable electronics where board space, efficiency, and fast transient response are critical.
FAQ
What is the exact output voltage of the FAN48618BUC53X and how tightly is it regulated?
The FAN48618BUC53X provides a fixed 5.25 V output with ±4% DC accuracy over temperature and load (−40°C to +85°C, 0–1 A). This specification is measured at the VOUT pin with effective output capacitance ≥5 µF and accounts for ripple-induced measurement offset. The FAN48618BUC53X achieves this stability using an internal trimmed reference and current-mode control architecture that rejects input voltage variation.
Does the FAN48618BUC53X support true load disconnect, and how does it behave during shutdown?
Yes, the FAN48618BUC53X implements true load disconnect: when EN is pulled LOW, both VIN-to-VOUT forward conduction and VOUT-to-VIN reverse leakage are blocked. Reverse leakage is limited to ≤3.5 µA at 2.7 V input, and forward path impedance exceeds 10 MΩ. This behavior isolates downstream circuits completely, preserving battery life in always-connected portable systems using the FAN48618BUC53X.
What are the absolute maximum ratings for input voltage and junction temperature on the FAN48618BUC53X?
The FAN48618BUC53X has an absolute maximum VIN rating of 6.0 V and a maximum junction temperature (TJ) of +150°C. Exceeding 6.0 V on VIN risks permanent damage to internal gate drivers and logic circuits. Thermal shutdown activates at 150°C with 20°C hysteresis, and the device resumes operation only after die temperature falls below 130°C. These limits are validated per JEDEC JESD51 and apply regardless of PCB layout or airflow for the FAN48618BUC53X.
Can the FAN48618BUC53X operate with input voltages below 2.7 V, and what happens if VIN drops below UVLO?
No-the FAN48618BUC53X is not specified to operate below 2.7 V input. Its under-voltage lockout (UVLO) triggers at 2.2 V (rising) with 150 mV hysteresis. If VIN falls below 2.2 V, the device shuts down, disables switching, and enters high-impedance state between VIN and VOUT. Recovery requires VIN to rise above 2.35 V before restart. Operation below 2.7 V violates recommended conditions and may cause unstable regulation or excessive RDS(ON) heating in the FAN48618BUC53X.
What is the recommended output capacitor value and type for stable operation of the FAN48618BUC53X?
The FAN48618BUC53X requires a minimum effective output capacitance (CEFF) of 5 µF for guaranteed stability across all operating conditions. The datasheet specifies a 22 µF, 10 V, X5R, 0603 ceramic capacitor (e.g., SEMCO CL10A226MP8NUNE) as the typical solution. Due to DC bias derating, actual capacitance at 5.25 V bias must remain ≥5 µF-verified via manufacturer's CEFF curves. Lower values risk instability and increased ripple beyond the 25 mV typical spec for the FAN48618BUC53X.
FAN48618BUC53X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- TinyBoost®
- Package/Case:
- 9-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):
- 2.7V
- Voltage - Input (Max):
- 4.8V
- Voltage - Output (Min/Fixed):
- 5.25V
- Voltage - Output (Max):
- -
- Current - Output:
- 1.2A
- 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)
FAN48618BUC53X FAQ
1.How can I place an order for FAN48618BUC53X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN48618BUC53X 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 FAN48618BUC53X reliable?
The price and inventory of FAN48618BUC53X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN48618BUC53X is usually 5 days.
3.What payment methods are accepted for FAN48618BUC53X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN48618BUC53X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN48618BUC53X?
FAN48618BUC53X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN48618BUC53X 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 FAN48618BUC53X?
For technical support, including FAN48618BUC53X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN48618BUC53X requirements.
6.How does Aetrix verify that FAN48618BUC53X is sourced from the original manufacturer or authorized distributors?
All FAN48618BUC53X 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 FAN48618BUC53X meets industry standards.
7.What is the process for return or replacement of FAN48618BUC53X?
All FAN48618BUC53X units undergo pre-shipment inspection (PSI). If there is an issue with FAN48618BUC53X, 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 FAN48618BUC53X part is unused and in its original packaging.
Return procedure for FAN48618BUC53X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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