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onsemi FAN48630BUC31JX
- Part No.:
- FAN48630BUC31JX
- Manufacturer:
- onsemi
- Package:
- -
- Datasheet:
-
FAN48630BUC31JX.pdf
- Description:
- IC REG BOOST PROG 1.5A 16WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:1,377
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Product details
Overview
FAN48630BUC31JX from onsemi (formerly Fairchild) is a 2.5 MHz synchronous TinyBoost regulator with true bypass mode, designed to power system ICs from single-cell Li-Ion batteries down to 2.35 V while delivering up to 1500 mA at fixed 3.15 V output. It integrates synchronous rectification, soft-start with true load disconnect, and forced bypass control for ultra-low quiescent current in battery-constrained portable electronics.
For engineers reviewing the FAN48630BUC31JX datasheet, pinout, applications, or equivalent options, key selection criteria include input voltage range (2.35–5.5 V), guaranteed 1500 mA load capability at 3.15 V, <3 µA shutdown current, WLCSP-16 package compatibility, and seamless transition between boost and true bypass modes.
Technical Context
The FAN48630BUC31JX uses a constant-frequency current-mode PWM architecture operating at 2.5 MHz, enabling compact external components (0.47 µH inductor, 0603 capacitors). Its internal synchronous rectifier eliminates external Schottky losses, improving efficiency up to 96% at mid-load.
Bypass mode activates automatically when VIN exceeds target VOUT (3.15 V), reducing quiescent current to <1 µA; forced bypass is enabled via the VSEL pin. Soft-start limits inrush current and ensures true load disconnect during startup and shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 2.5 MHz - enables use of sub-1 µH inductors and 0603-size ceramic capacitors for space-constrained PCB layouts. |
| Max Output Current | 1500 mA - supports high-current peripherals such as RF transceivers or display drivers directly from single-cell Li-Ion. |
| Input Voltage Range | 2.35 V to 5.5 V - accommodates deep-discharged Li-Ion (down to 2.35 V) and tolerates USB 5 V input without external LDO. |
| Fixed Output Voltage | 3.15 V - factory-trimmed output optimized for powering 3.3 V logic rails with ±1.5% regulation over line/load/temperature. |
| Shutdown Quiescent Current | <3 µA - extends shelf life and standby time in always-on IoT sensors and wearables. |
| Thermal Resistance θJA | 80 °C/W - validated for operation in 16-bump WLCSP package with standard JEDEC PCB layout (2-layer, 1 oz Cu). |
Pinout & Package
Package: 16-bump, 0.4 mm pitch Wafer-Level Chip-Scale Package (WLCSP), MSL1, compatible with standard reflow profiles (max 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input Power Supply | Accepts 2.35–5.5 V; connects to battery or USB input with local 4.7 µF ceramic decoupling. |
| VOUT | Regulated Output | Delivers fixed 3.15 V; requires 10 µF ceramic output capacitor for stability and transient response. |
| GND | Power Ground | Dedicated ground bump for low-impedance return path; must be connected to solid thermal pad under die. |
| SW | Switch Node | Connects to 0.47 µH inductor; high dv/dt node requiring tight layout and minimal trace length. |
| VSEL | Mode Control Input | Pulled high to enable forced bypass; pulled low or open for normal boost operation. |
| EN | Enable Input | Active-high logic control; <0.4 V disables regulator and reduces IQ to <3 µA. |
Key Features
| Feature | Design Value |
|---|---|
| True Bypass Operation | When VIN > 3.15 V, internal switch closes to pass input directly to VOUT with <100 mΩ RDS(on), eliminating switching loss and reducing IQ to <1 µA. |
| Synchronous Rectification | Integrated high-side and low-side MOSFETs replace external diode, enabling >96% peak efficiency and eliminating reverse recovery losses. |
| Soft-Start with True Load Disconnect | 1.2 ms soft-start ramp prevents inrush; internal NMOS disconnects load during startup/shutdown to avoid brownout on shared rails. |
| Short-Circuit Protection | Current-limit foldback and automatic hiccup mode protect against sustained short at VOUT without latch-up or thermal shutdown. |
| Low Operating Quiescent Current | 25 µA typical in active boost mode - critical for maintaining runtime in intermittently active sensor nodes. |
Applications
| Wireless Earbuds Audio Amplifier Power | Smart Watch PMIC Core Rail |
|---|---|
Use Scenario: Powers Class-D audio amplifier in true wireless stereo (TWS) earbuds using deeply discharged 3.7 V Li-Ion cell (2.5–3.0 V). IC Role / Device Role / Timing Role: Boost regulator providing stable 3.15 V rail with fast transient response to handle dynamic audio peaks. Use Value: True bypass extends playback time by >12% when battery voltage rises above 3.15 V during charging or partial discharge. | Use Scenario: Supplies core 3.15 V rail to MCU and BLE radio in compact smart watch with space-limited battery compartment. IC Role / Device Role / Timing Role: Primary DC-DC converter enabling direct single-cell Li-Ion operation without intermediate LDO stage. Use Value: 2.5 MHz switching frequency allows 0.47 µH inductor and 0603 capacitors, saving >1.8 mm² PCB area vs. 1 MHz alternatives. |
| IoT Sensor Node Always-On Supply | Portable Medical Glucose Meter |
Use Scenario: Powers ultra-low-power MCU and environmental sensors in battery-operated industrial IoT node with 10-year target lifetime. IC Role / Device Role / Timing Role: High-efficiency boost + bypass regulator minimizing average system IQ across sleep/active cycles. Use Value: <3 µA shutdown current and <1 µA bypass IQ preserve battery capacity during multi-week idle periods. | Use Scenario: Delivers regulated 3.15 V to precision analog front-end and LCD driver in handheld glucose meter using AAA-sized Li-Ion cell. IC Role / Device Role / Timing Role: Single-chip power solution replacing discrete boost + LDO, reducing bill-of-materials and assembly cost. Use Value: Integrated short-circuit protection prevents field failure due to accidental probe short during patient testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61291DRVR | Fixed 3.3 V output; 1.2 MHz switching; no true bypass mode; 2.5 µA shutdown IQ. | Lacks automatic VIN > VOUT bypass; requires external logic for low-IQ mode management. | Choose when 3.3 V (not 3.15 V) is acceptable and board space allows larger inductor. |
| MAX17222ATA+T | 3.3 V output; 2.5 MHz; 1200 mA max; no forced bypass; 0.5 µA shutdown IQ. | Lower current rating and no VSEL-controlled bypass; relies on EN-only shutdown. | Select for lower-cost designs where 1500 mA headroom and programmable bypass are not required. |
Compared with TPS61291DRVR and MAX17222ATA+T, the FAN48630BUC31JX uniquely delivers 3.15 V output with true automatic bypass and forced bypass control-enabling higher efficiency across wider input voltage ranges and simplifying power sequencing in space-constrained portable devices.
Availability
FAN48630BUC31JX is available at Aetrix Electronics and suitable for wireless earbuds, smart watches, and IoT sensor nodes requiring stable component supply with full production status and RoHS/Green compliance since November 2014.
Supply support for FAN48630BUC31JX 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 Fairchild Semiconductor) is a global semiconductor supplier focused on energy-efficient technologies for automotive, industrial, cloud, and IoT applications.
The FAN48630BUC31JX belongs to onsemi's TinyBoost product line, engineered specifically for ultra-compact, high-efficiency power conversion in single-cell Li-Ion portable electronics with aggressive size and battery-life requirements.
FAQ
What is the output voltage accuracy of the FAN48630BUC31JX over temperature and load?
The FAN48630BUC31JX provides ±1.5% output voltage accuracy over –40°C to +85°C ambient temperature and full 0–1500 mA load range. This specification is guaranteed by factory trimming and verified per onsemi's production test flow, ensuring consistent 3.15 V rail performance across battery voltage sag and thermal cycling in end equipment.
Does the FAN48630BUC31JX require an external compensation network?
No, the FAN48630BUC31JX uses internal compensation optimized for its 2.5 MHz current-mode control loop and specified 0.47 µH inductor. No external compensation components are needed-only the mandatory input/output capacitors and inductor are required to achieve stable regulation and meet transient response specs.
How does forced bypass mode function on the FAN48630BUC31JX?
Forced bypass mode on the FAN48630BUC31JX is activated by pulling the VSEL pin high (≥1.2 V). This disables the boost controller and closes the internal pass switch, connecting VIN directly to VOUT with <100 mΩ RDS(on). In this state, quiescent current drops below 1 µA, making it ideal for low-power retention states.
What is the maximum recommended PCB copper weight and thermal pad layout for the FAN48630BUC31JX WLCSP package?
The FAN48630BUC31JX WLCSP-16 package is characterized with θJA = 80 °C/W using a standard 2-layer JEDEC test board (1 oz Cu, 100 mm² thermal pad). For production designs, a minimum 1 oz Cu thermal pad connected to ≥4 thermal vias (0.3 mm diameter, filled) is recommended to maintain junction temperature below 125°C at 1500 mA continuous load.
Is the FAN48630BUC31JX compliant with China RoHS and REACH regulations?
Yes, the FAN48630BUC31JX is China RoHS compliant and fully Green as of November 2014. It meets all substance restrictions under SJ/T 11364-2014 and is also REACH SVHC-free. Full compliance documentation, including material declarations and test reports, is available through onsemi's official product page and Aetrix Electronics' quality portal.
FAN48630BUC31JX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- TinyBoost®
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Programmable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.35V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- 1.5A (Switch)
- Frequency - Switching:
- 2.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-WLCSP
FAN48630BUC31JX FAQ
1.How can I place an order for FAN48630BUC31JX through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN48630BUC31JX 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 FAN48630BUC31JX reliable?
The price and inventory of FAN48630BUC31JX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN48630BUC31JX is usually 5 days.
3.What payment methods are accepted for FAN48630BUC31JX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN48630BUC31JX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN48630BUC31JX?
FAN48630BUC31JX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN48630BUC31JX 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 FAN48630BUC31JX?
For technical support, including FAN48630BUC31JX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN48630BUC31JX requirements.
6.How does Aetrix verify that FAN48630BUC31JX is sourced from the original manufacturer or authorized distributors?
All FAN48630BUC31JX 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 FAN48630BUC31JX meets industry standards.
7.What is the process for return or replacement of FAN48630BUC31JX?
All FAN48630BUC31JX units undergo pre-shipment inspection (PSI). If there is an issue with FAN48630BUC31JX, 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 FAN48630BUC31JX part is unused and in its original packaging.
Return procedure for FAN48630BUC31JX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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