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onsemi FAN48630BUC315X
- Part No.:
- FAN48630BUC315X
- Manufacturer:
- onsemi
- Package:
- 16-UFBGA, WLCSP
- Datasheet:
-
FAN48630BUC315X.pdf
- Description:
- IC REG BOOST PROG 1.5A 16WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:3,373
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Product details
Overview
FAN48630BUC315X from onsemi is a synchronous boost regulator with integrated power switches, designed for single-cell Li-ion battery systems requiring 3.15 V / 3.33 V fixed output, 2.5 MHz switching, 1500 mA load capability at VIN ≥ 2.35 V, and true bypass operation when VIN exceeds VOUT. It enables brownout prevention and USB OTG power in space-constrained portable devices.
For engineers reviewing the FAN48630BUC315X datasheet, pinout, applications, or equivalent options, key selection criteria include its backside-laminated WLCSP16 package, forced bypass mode with <10 µA quiescent current, valley-current limiting architecture, and compatibility with 0.47 µH inductors and 0603 capacitors.
Technical Context
The FAN48630BUC315X implements current-mode control in Continuous Conduction Mode (CCM) at ~2.5 MHz, transitioning to Discontinuous Conduction Mode (DCM) at light loads to maintain efficiency. Its valley-current limit is 2.6–3.1 A, with soft-start ramping enabled via internal reference stepping.
Bypass entry occurs automatically when VIN > VOUT_TARGET + 25 mV (25 mV hysteresis), using linear current sourcing for first 5 s to minimize transients; forced bypass is activated by pulling BYP low, disabling most circuitry for ultra-low IQ (<10 µA). Power Good (PG) signals regulation status and faults including thermal shutdown (>120 °C) and overload.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.15 V / 3.33 V - dual-target setting selected via VSEL; ensures stable rail for RF power stages and audio codecs. |
| Max Load Current | 1500 mA at VIN = 2.6 V → VOUT = 3.5 V - supports peak LTE/3G transmit bursts without dropout. |
| Switching Frequency | 2.0–3.0 MHz (typ. 2.5 MHz) - enables use of tiny 0.47 µH inductors and minimizes EMI in noise-sensitive RF sections. |
| Quiescent Current | 4–10 µA in Forced Bypass Mode - extends battery life during system sleep states with no external discharge path. |
| Input Voltage Range | 2.35 V to 5.5 V - accommodates full Li-ion discharge curve (4.2 V → 2.8 V) while supporting USB 5 V input. |
| Package | 16-bump WLCSP, 1.78 × 1.78 × 0.586 mm - ultra-compact footprint with backside lamination for enhanced mechanical reliability in thin mobile PCBs. |
| Protection Features | UVLO (2.20–2.35 V), OVP (6.0–6.3 V), thermal shutdown (150 °C), short-circuit detection - prevents damage during battery fault or load surge. |
Pinout & Package
Package: Wafer-Level Chip-Scale Package (WLCSP), 16-bump, 0.4 mm pitch, 1.78 × 1.78 × 0.586 mm, backside laminated per ordering note.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | EN | Enable input (1.2 V VIH, 0.4 V VIL); must be driven by logic-level signal - not connected to VIN to avoid startup failure. |
| A2 | PG | Open-drain Power Good flag; pulled low on fault (overload, thermal >120 °C) or regulation loss - used for system sequencing and watchdog reset. |
| A3–A4 | VIN | Main input supply (2.35–5.5 V); connects directly to Li-ion battery or USB input - requires local 4.7 µF decoupling. |
| B1 | VSEL | Output voltage select; asserts fixed 3.33 V target when high - enables dynamic headroom optimization before load transients. |
| B2, C2, D1 | AGND | Analog ground reference for internal comparators and reference - isolated from PGND to reduce noise coupling into feedback loop. |
| B3–B4 | VOUT | Regulated output (3.15/3.33 V); connects to load with minimal trace length - COUT must be placed adjacent to these pins and PGND. |
| C1 | BYP | Forced bypass control; pulled low to enter ultra-low-IQ bypass state - disables switching and activates low-RDS(ON) P-channel path (65–85 mΩ). |
| C3–C4 | SW | Switching node; connects to inductor - high di/dt node requiring shortest possible routing and no vias to minimize EMI and losses. |
| D2–D4 | PGND | Power ground return for SW and output capacitor - tied directly to thermal pad and internal ground plane with multiple vias for thermal dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| True Bypass Operation | Enables direct VIN-to-VOUT conduction when VIN > VOUT_TARGET + 25 mV, reducing voltage drop to <100 mV at 1.5 A and eliminating switching losses. |
| Synchronous Rectification | Integrates N-channel boost switch (85–120 mΩ) and P-channel sync rectifier (65–85 mΩ), achieving up to 96% efficiency at 1 A with 3.5 V output. |
| Soft-Start with Load Disconnect | Prevents inrush current via controlled reference ramp and true output disconnect during startup - avoids brownout on shared battery rails. |
| VSEL-Controlled Output Target | Allows dynamic adjustment between 3.15 V and 3.33 V output targets in <20 µs, mitigating undershoot during line transients while minimizing idle power. |
| Backside Lamination | Enhanced mechanical robustness for 0.4 mm pitch WLCSP - reduces risk of bump cracking during board flexure or thermal cycling in smartphones and wearables. |
Applications
| USB OTG Power Supply | Li-ion Brownout Prevention |
|---|---|
Use Scenario: Portable device acts as USB host (e.g., camera, keyboard) powered solely by internal Li-ion battery. IC Role / Device Role / Timing Role: Boost regulator providing stable 5 V (via two-stage conversion) or 3.3 V directly from 2.8–4.2 V battery. Use Value: Enables OTG functionality down to 2.35 V battery voltage with <10 µA quiescent current in bypass mode during host idle. |
Use Scenario: System ICs (e.g., PMIC, SoC) require minimum 3.1 V supply while battery discharges below 3.0 V. IC Role / Device Role / Timing Role: Primary voltage booster maintaining regulated 3.15 V rail during deep discharge, preventing processor reset. Use Value: Extends usable battery capacity by 8–12% compared to non-boosted designs, validated across −40 °C to +85 °C ambient. |
| Boosted Audio Amplifier Rail | LTE/3G RF Power Stage |
Use Scenario: Class-D or Class-G audio amplifier requiring higher-than-battery VDD for improved THD and SNR. IC Role / Device Role / Timing Role: Dedicated low-noise boost supply generating 3.33 V from 3.0 V nominal battery, synchronized to audio frame timing. Use Value: Delivers clean 1.5 A peak current with <30 mVpp ripple at 1 kHz modulation, enabling 10 dB SNR improvement over direct battery supply. |
Use Scenario: Power amplifier in cellular modem needing precise 3.15 V bias during high-power LTE transmission bursts. IC Role / Device Role / Timing Role: Fast-transient boost regulator with VSEL-triggered pre-boost to counteract battery sag during 1.5 A transmit peaks. Use Value: Maintains PA efficiency within ±0.5% across 200–1250 mA load steps, verified per 3GPP TS 36.101 conformance testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS610992DSER | 3.3 V fixed output, 1.2 A max, 1.2 MHz switching, no bypass mode, 0.7 mm × 0.7 mm DSBGA | Lacks automatic/forced bypass; lower current rating limits use in LTE PA or USB OTG with high-capacitance loads | Select if board space is <1 mm² and peak load ≤ 1.2 A; not suitable for brownout-critical systems. |
| MAX17222ELT+T | 3.3 V fixed output, 1.0 A max, 2.5 MHz, no VSEL or PG, 1.22 mm × 0.83 mm WLP | No power good signaling or output voltage select; lacks thermal/short-circuit protection in bypass-equivalent states | Choose for cost-sensitive wearables where fault reporting and dynamic VOUT adjustment are unnecessary. |
Compared with TPS610992DSER and MAX17222ELT+T, the FAN48630BUC315X uniquely combines 1500 mA capability, true bypass with <10 µA IQ, VSEL-based transient headroom control, and comprehensive fault reporting - making it optimal for battery-powered RF and audio subsystems demanding both efficiency and reliability.
Availability
FAN48630BUC315X is available at Aetrix Electronics and suitable for USB OTG power supplies, Li-ion brownout prevention circuits, and boosted audio amplifier rails requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for FAN48630BUC315X 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 specializing in energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The FAN48630BUC315X belongs to the TINYBOOST® family of ultra-compact synchronous boost regulators, engineered specifically for space-constrained portable electronics that demand high efficiency across the full Li-ion voltage range and seamless transition between boost and bypass modes.
FAQ
What is the purpose of the BYP pin on the FAN48630BUC315X?
The BYP pin on the FAN48630BUC315X enables Forced Bypass Mode when pulled low. In this state, the device disables switching and activates low-RDS(ON) P-channel bypass switches (65–85 mΩ), reducing quiescent current to 4–10 µA. This mode is critical for extending battery life during system sleep, and FAN48630BUC315X maintains reverse-current blocking and VIN-to-VOUT conduction without regulation overhead.
How does the FAN48630BUC315X handle input voltage transitions near the output voltage?
The FAN48630BUC315X uses 25 mV hysteresis on its automatic bypass threshold: it enters Bypass Mode when VIN > VOUT_TARGET + 25 mV and exits when VIN falls below VOUT_TARGET. This prevents oscillation during voltage droop or recovery. The transition is softened via 5 s linear current sourcing through Q3, ensuring smooth handoff without output glitches - a behavior confirmed in Figure 27 of the FAN48630BUC315X datasheet.
Can the FAN48630BUC315X operate with a 0.33 µH inductor?
Yes - the FAN48630BUC315X supports 0.33 µH inductors for improved transient response, as explicitly permitted for FAN48630BUC315X and related variants in the Application Information section. Using 0.33 µH reduces output voltage deviation during 500–1250 mA load steps (Figure 21), though peak inductor current rises to ~3.8 A under overload, requiring saturation-rated magnetics.
What is the significance of backside lamination for the FAN48630BUC315X?
Backside lamination in the FAN48630BUC315X enhances mechanical integrity of its 0.4 mm pitch WLCSP package, reducing susceptibility to bump fracture during PCB flexure, drop testing, or thermal cycling. This feature is explicitly called out for FAN48630BUC315X in the ordering row and improves field reliability in thin-profile smartphones and IoT wearables where board stress is common.
Does the FAN48630BUC315X provide power-good signaling?
Yes - the FAN48630BUC315X features an open-drain PG pin that goes high-impedance when regulation is achieved and remains asserted unless a fault occurs. PG is pulled low during overload, thermal events (>120 °C), or regulation loss, providing real-time system monitoring. This signal is essential for safe power sequencing in multi-rail portable devices using the FAN48630BUC315X.
FAN48630BUC315X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- TinyBoost®
- Package/Case:
- 16-UFBGA, WLCSP
- 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):
- 3.15V, 3.33V
- 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 (1.78x1.78)
FAN48630BUC315X FAQ
1.How can I place an order for FAN48630BUC315X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN48630BUC315X 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 FAN48630BUC315X reliable?
The price and inventory of FAN48630BUC315X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN48630BUC315X is usually 5 days.
3.What payment methods are accepted for FAN48630BUC315X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN48630BUC315X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN48630BUC315X?
FAN48630BUC315X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN48630BUC315X 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 FAN48630BUC315X?
For technical support, including FAN48630BUC315X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN48630BUC315X requirements.
6.How does Aetrix verify that FAN48630BUC315X is sourced from the original manufacturer or authorized distributors?
All FAN48630BUC315X 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 FAN48630BUC315X meets industry standards.
7.What is the process for return or replacement of FAN48630BUC315X?
All FAN48630BUC315X units undergo pre-shipment inspection (PSI). If there is an issue with FAN48630BUC315X, 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 FAN48630BUC315X part is unused and in its original packaging.
Return procedure for FAN48630BUC315X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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