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onsemi FAN48619UC50X
- Part No.:
- FAN48619UC50X
- Manufacturer:
- onsemi
- Package:
- 9-UFBGA, WLCSP
- Datasheet:
-
FAN48619UC50X.pdf
- Description:
- IC REG BOOST 5V 1A 9WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:2,865
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Product details
Overview
FAN48619UC50X from onsemi is a fixed-output 5.0 V synchronous TINYBOOST DC-DC boost regulator in WLCSP-9 package, designed for single-cell Li-ion battery systems requiring regulated 5 V rail down to 2.7 V input. It delivers up to 1000 mA load current with PWM-only control, 97% peak efficiency, and forced pass-through operation via EN pin. Used in portable audio amplifiers and NFC power rails where compact size and true load disconnect are critical.
For engineers reviewing the FAN48619UC50X datasheet, pinout, applications, or equivalent options, key selection criteria include its 2.7–4.5 V input range, 5.0 V ±2% output accuracy, 2.3 MHz typical switching frequency, internal synchronous rectification, and backside-laminated WLCSP-9 thermal performance for space-constrained mobile designs.
Technical Context
The FAN48619UC50X implements a current-mode PWM-only boost architecture with integrated N-channel switch (63 mΩ RDS(ON)) and P-channel synchronous rectifier (52 mΩ RDS(ON)). It supports three operating modes: Linear Startup (LIN), Soft-Start (SS), and Boost (BST), plus Forced Pass-Through (PT) triggered by pulling EN low after startup.
Its control logic includes under-voltage lockout (2.20 V with 150 mV hysteresis), valley-current limiting, automatic fault restart (20 ms timer), and over-temperature shutdown at 150°C. The device maintains regulation below minimum system battery voltage and provides true load disconnect during shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±2% DC accuracy across 0–1000 mA load and −40°C to +85°C ambient - ensures stable USB-compliant rail for peripherals. |
| Input Voltage Range | 2.7 V to 4.5 V - supports full discharge curve of single-cell Li-ion (3.0–4.2 V nominal) and advanced chemistries like LiFePO₄. |
| Max Output Current | 1000 mA continuous - sufficient to drive Class-D audio amplifiers or dual-band RF power stages without external boost stages. |
| Switching Frequency | 1.8–2.8 MHz typical - enables use of ultra-small 470 nH 2016-inductor and 0402 capacitors, minimizing PCB footprint. |
| Quiescent Current | 95 µA at no load - extends battery runtime in always-on NFC or sensor wake-up circuits. |
| Efficiency | Up to 97% at mid-load - reduces thermal stress in sealed portable enclosures and preserves battery capacity. |
| Thermal Resistance | Junction-to-ambient θJA = 101°C/W - validated on 4-layer JEDEC-standard board; requires minimal copper pour for thermal management. |
Pinout & Package
Package: 9-bump Wafer-Level Chip-Scale Package (WLCSP), 1.215 mm × 1.215 mm × 0.38 mm, 0.4 mm pitch, Case 567QW, with backside lamination for enhanced thermal and mechanical reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1, A2 | VOUT | Regulated 5.0 V output node - must connect directly to COUT with shortest possible trace to minimize ripple and EMI. |
| A3 | VIN | Battery input (2.7–4.5 V) - connects to CIN and Li-ion cell; feeds internal linear startup and boost circuitry. |
| B1, B2 | SW | Switching node - connects to inductor L1; carries high di/dt pulses; requires tight layout to PGND to reduce ringing. |
| B3 | EN | Enable/Pass-Through control - HIGH enables boost mode; LOW (after startup) forces direct VIN-to-VOUT conduction with <3.5 µA quiescent current. |
| C1, C2 | PGND | Power ground return - dedicated low-impedance path for inductor current and COUT; must be tied to AGND at single point. |
| C3 | AGND | Analog ground reference - signal reference for feedback and control logic; isolated from PGND except at one star point. |
Key Features
| Feature | Design Value |
|---|---|
| Internal Synchronous Rectification | Eliminates external Schottky diode, reducing conduction loss and enabling >97% efficiency at 500 mA with 470 nH inductor. |
| Forced Pass-Through Operation | EN pin allows seamless transition from boost to direct conduction when VIN ≥ VOUT, cutting IQ to 3.5 µA and removing switching noise. |
| True Load Disconnect | High-impedance isolation between VIN and VOUT during shutdown - prevents battery drain in standby or fault states. |
| Short-Circuit Protection | Valley-current limiting and automatic 20 ms fault restart prevent latch-up or thermal runaway during output short events. |
| Three-Component Solution | Only requires 470 nH inductor and two 10 µF 0402 capacitors - simplifies BOM and layout for ultra-thin mobile PCBs. |
Applications
| Class-D Audio Power Supply | NFC Reader Power Rail |
|---|---|
|
Use Scenario: Powers Class-D amplifier ICs (e.g., NCP2820) from a single Li-ion cell in smartphones and wireless speakers. IC Role / Device Role / Timing Role: Fixed 5.0 V boost regulator providing clean, low-noise supply with fast transient response to dynamic audio loads. Use Value: Enables full amplifier output power even at 3.2 V battery voltage while maintaining THD+N <0.05% via low output ripple (<20 mVpp). |
Use Scenario: Supplies regulated 5.0 V to ISO14443-compliant NFC transceivers (e.g., PN5180) during card emulation or reader mode. IC Role / Device Role / Timing Role: Low-quiescent, fast-startup boost converter that powers NFC IC only during active communication bursts. Use Value: Achieves <425 µs start-up time to 95% regulation and supports duty-cycled operation with <3.5 µA IQ in forced pass-through between sessions. |
| Smartphone Peripheral Boost | RF Front-End Bias Supply |
|
Use Scenario: Generates 5.0 V for USB OTG accessories, camera flash ICs, or fingerprint sensors in space-constrained smartphone modules. IC Role / Device Role / Timing Role: Compact, laminated WLCSP-9 regulator delivering 1 A peak current with minimal board area and thermal footprint. Use Value: Backside lamination improves thermal coupling to PCB, allowing sustained 1000 mA output without derating in 1.2 mm² footprint. |
Use Scenario: Provides stable 5.0 V bias to GaAs pHEMT or SOI RF switches and LNAs in LTE/5G front-end modules. IC Role / Device Role / Timing Role: Low-noise, high-PSRR boost stage isolating sensitive RF circuitry from noisy battery rail fluctuations. Use Value: Delivers <1.0% VOUT accuracy and <20 mVpp ripple across temperature, ensuring consistent gain and linearity in RF power stages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS610995RTER | Fixed 5.0 V output, 1.2 MHz switching, 400 mA max, 0.7 µA IQ shutdown - lacks forced pass-through and true load disconnect. | Suitable for lower-current always-on sensors but not for 1 A audio or NFC burst loads requiring fast regulation recovery. | Choose FAN48619UC50X when >500 mA load, forced pass-through, or backside thermal lamination is required. |
| MAX17222ELT+T | Adjustable output (0.6–5.25 V), 1.2 MHz, 500 mA max, 300 nA IQ - no EN-controlled pass-through mode or internal sync rectifier. | Used in multi-rail systems needing programmability, but requires external MOSFET and adds complexity for fixed 5 V use cases. | Choose FAN48619UC50X for plug-and-play 5.0 V generation with minimal external components and guaranteed 1000 mA capability. |
Compared with TPS610995RTER and MAX17222ELT+T, the FAN48619UC50X uniquely combines 1000 mA capability, EN-triggered pass-through, true load disconnect, and backside-laminated WLCSP-making it optimal for thermally demanding, high-burst-power portable applications where layout area and startup behavior are critical.
Availability
FAN48619UC50X is available at Aetrix Electronics and suitable for Class-D audio amplifiers, NFC readers, and smartphone peripheral power supplies requiring stable component supply, high-volume tape-and-reel delivery, and long-term lifecycle support.
Supply support for FAN48619UC50X 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 focused on energy-efficient technologies for automotive, industrial, cloud, medical, and portable electronics.
The FAN48619UC50X belongs to onsemi's TINYBOOST family of ultra-compact synchronous boost regulators, engineered specifically for space- and power-constrained mobile devices requiring reliable 5 V generation from single-cell batteries.
FAQ
What is the function of the EN pin on the FAN48619UC50X?
The EN pin on the FAN48619UC50X controls both enable/disable and operating mode. When pulled HIGH (≥1.05 V), the device starts in boost mode; once regulation is achieved, pulling EN LOW forces immediate transition to Forced Pass-Through Mode, bypassing the boost circuitry to deliver VIN directly to VOUT with only 3.5 µA quiescent current. The FAN48619UC50X cannot start in Pass-Through Mode - EN must remain HIGH for ≥350 µs during startup to ensure reliable mode entry.
Does the FAN48619UC50X support true load disconnect during shutdown?
Yes, the FAN48619UC50X provides true load disconnect: when disabled (EN low after startup or fault condition), it presents a high-impedance path between VIN and VOUT, preventing reverse current flow and eliminating battery drain to downstream circuits. This behavior is confirmed in the datasheet's "Fault State" and "Pass-Through Mode" sections and is distinct from regulators that maintain a body-diode path. The FAN48619UC50X achieves this using internal control logic that gates both power switches off simultaneously.
What is the recommended inductor for the FAN48619UC50X and why?
The recommended inductor for the FAN48619UC50X is the TOKO DFE201610E-R47M: a 470 nH, 2016 metric case, 5.3 A saturation current, 26 mΩ DCR part. This value matches the device's 2.3 MHz typical switching frequency and 1000 mA load capability, minimizing peak-to-peak inductor current ripple and core losses. Using this inductor with 10 µF 0402 input/output capacitors achieves ≤20 mVpp output ripple and >95% efficiency at 500 mA - as verified in Figures 6–7 and Table 1 of the FAN48619UC50X datasheet.
How does the FAN48619UC50X handle input voltage dropout below 2.7 V?
The FAN48619UC50X incorporates under-voltage lockout (UVLO) with a 2.20 V threshold and 150 mV hysteresis. When VIN drops below 2.20 V, the device shuts down completely - disabling switching, disconnecting load, and drawing only leakage current. It remains latched off until VIN rises above 2.35 V. This protects the battery from deep discharge and prevents erratic regulation. The FAN48619UC50X does not operate below 2.7 V per Recommended Operating Conditions, and UVLO ensures safe shutdown before that limit is breached.
Is the FAN48619UC50X RoHS and REACH compliant?
Yes, the FAN48619UC50X is explicitly marked as Pb-free and halide-free in the datasheet (page 1, Features section), confirming compliance with RoHS Directive 2011/65/EU and EU REACH Regulation (EC) No. 1907/2006. The "Z" suffix in the marking diagram denotes Pb-free packaging, and the device meets JESD22-A112 moisture sensitivity level (MSL) 1 requirements. All materials declarations and substance reports for the FAN48619UC50X are available through onsemi's official product environmental page.
FAN48619UC50X 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):
- 4.5V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 1A
- Frequency - Switching:
- 2.3MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 9-WLCSP (1.22x1.22)
FAN48619UC50X FAQ
1.How can I place an order for FAN48619UC50X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN48619UC50X 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 FAN48619UC50X reliable?
The price and inventory of FAN48619UC50X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN48619UC50X is usually 5 days.
3.What payment methods are accepted for FAN48619UC50X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN48619UC50X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN48619UC50X?
FAN48619UC50X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN48619UC50X 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 FAN48619UC50X?
For technical support, including FAN48619UC50X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN48619UC50X requirements.
6.How does Aetrix verify that FAN48619UC50X is sourced from the original manufacturer or authorized distributors?
All FAN48619UC50X 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 FAN48619UC50X meets industry standards.
7.What is the process for return or replacement of FAN48619UC50X?
All FAN48619UC50X units undergo pre-shipment inspection (PSI). If there is an issue with FAN48619UC50X, 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 FAN48619UC50X part is unused and in its original packaging.
Return procedure for FAN48619UC50X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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