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onsemi FAN48630UC37AX
- Part No.:
- FAN48630UC37AX
- Manufacturer:
- onsemi
- Package:
- 16-UFBGA, WLCSP
- Datasheet:
-
FAN48630UC37AX.pdf
- Description:
- IC REG BOOST PROG 1.5A 16WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:1,589
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Product details
Overview
FAN48630UC37AX from onsemi is a synchronous boost regulator with integrated power switches, designed for single-cell Li-ion battery systems requiring 3.70 V to 3.77 V fixed output at up to 1500 mA load current. It features true bypass mode, 2.5 MHz switching frequency, and low-quiescent-current forced bypass (4–10 µA) for extended battery life in portable electronics.
For engineers reviewing the FAN48630UC37AX datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, validated WLCSP-16 pin mapping, real-world load transient behavior, and confirmed alternative options for brownout prevention, USB OTG power, and LTE RF supply.
Technical Context
The FAN48630UC37AX operates in current-mode control with valley-current limiting and supports seamless transitions between linear startup (LIN), soft-start (SS), continuous conduction mode (CCM) boost (BST), and automatic or forced bypass (BPS). Its 2.5 MHz nominal switching frequency enables compact 0.47 µH inductor and 0603-size capacitors.
Bypass activation occurs when VIN exceeds the target VOUT (3.70–3.77 V) by ≥25 mV hysteresis; forced bypass is triggered via dedicated BYP pin. Internal synchronous rectification uses P-channel MOSFETs with RDS(ON) of 65–85 mΩ, and thermal protection activates at 120 °C (trip) / 100 °C (release).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.70 V to 3.77 V - precisely targets 3.7 V nominal Li-ion system rails with ±2% DC regulation accuracy. |
| Max Load Current | 1500 mA at VIN = 2.6 V boosting to 3.5 V - sustains full system load during deep battery discharge down to 2.35 V input. |
| Switching Frequency | 2.5 MHz typical - enables use of ultra-small 0.47 µH inductors and minimizes EMI filtering requirements. |
| Quiescent Current (Forced Bypass) | 4–10 µA - extends shelf life and standby time in always-on portable devices without external disconnect circuitry. |
| Input Voltage Range | 2.35 V to 5.5 V - supports full single-cell Li-ion voltage range (including post-discharge recovery) and USB 5 V input compatibility. |
| Efficiency | Up to 96% - achieved at mid-load (500–1000 mA) and 3.6 V input, reducing thermal stress in space-constrained WLCSP packages. |
| Protection Features | Short-circuit, UVLO (2.20–2.35 V), OVP (6.0–6.3 V), thermal shutdown (120/150 °C), and PG fault signaling - ensures robust operation under fault conditions. |
Pinout & Package
Package: 16-bump Wafer-Level Chip-Scale Package (WLCSP), 1.78 mm × 1.78 mm × 0.586 mm, 0.4 mm pitch, case 567SY.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 (EN) | Enable control input | Logic-level enable (VIH ≥ 1.2 V, VIL ≤ 0.4 V); must be driven by 1.8 V logic - not directly from VIN to prevent latch-up. |
| A2 (PG) | Open-drain Power Good | Asserts HIGH after successful soft-start; pulled LOW during overload, thermal fault (>120 °C), or FAULT state - provides system-level health monitoring. |
| A3–A4 (VIN) | Main input power | Connects directly to Li-ion battery anode; supports 2.35–5.5 V range with internal UVLO hysteresis (200 mV). |
| B1 (VSEL) | Output voltage select | Adjusts VOUT_TARGET upward in fixed steps to pre-empt load transients - used for dynamic headroom optimization in audio/LTE applications. |
| B2, C2, D1 (AGND) | Analog ground reference | Signal return for internal error amplifier and reference - must be isolated from PGND plane to avoid noise coupling into regulation loop. |
| B3–B4 (VOUT) | Regulated output | Delivers stable 3.70–3.77 V; requires COUT placed adjacent to these pins and PGND for low-impedance high-frequency decoupling. |
| C1 (BYP) | Forced bypass control | Pull LOW to activate ultra-low-IQ bypass mode; reverse-current blocking prevents battery discharge during forced bypass. |
| C3–C4 (SW) | Switching node | Connects to inductor; carries high di/dt pulses - requires shortest possible trace to minimize EMI and voltage overshoot. |
| D2–D4 (PGND) | Power ground return | High-current return path for boost switch and synchronous rectifier - must tie directly to COUT negative terminal via minimal-length copper. |
Key Features
| Feature | Design Value |
|---|---|
| True bypass operation | VIN-to-VOUT path with RDS(ON) ≤ 85 mΩ (P-ch bypass switch) - eliminates switching losses and reduces quiescent current to <10 µA during battery-sufficient conditions. |
| Synchronous rectification | Integrated N-ch boost switch (RDS(ON) 85–120 mΩ) + P-ch sync rectifier (65–85 mΩ) - avoids external Schottky loss and improves efficiency by 5–8% vs. asynchronous designs. |
| Soft-start with true load disconnect | Controlled 600 µs (FAST) ramp from EN HIGH to regulation - prevents inrush current damage to battery and downstream LDOs while isolating load until VOUT stabilizes. |
| VSEL-controlled VOUT targeting | Adjusts output setpoint in fixed increments before load step - mitigates undershoot during 100 ns edge transients (e.g., LTE PA burst) without over-designing output capacitance. |
| Short-circuit protection | Active during both boost and forced bypass modes (OCP-On variant); detects >200 mV VIN–VOUT drop - protects battery and PCB traces during accidental shorts. |
Applications
| Boosted Audio Power Supply | USB OTG Host Power |
|---|---|
Use Scenario: Portable speaker or headset IC requiring 3.7 V rail from 3.0–4.2 V Li-ion battery, with rapid 500–1250 mA load steps during bass transients. IC Role / Device Role / Timing Role: Synchronous boost regulator providing regulated 3.70–3.77 V output with <±4% load transient response and 2.5 MHz switching for minimal output ripple. Use Value: Eliminates need for oversized 22 µF ceramic output caps by leveraging fast transient response and VSEL pre-boost, reducing BOM cost and board area. |
Use Scenario: Smartphone acting as USB host for peripherals (keyboard, flash drive), drawing up to 1500 mA at 5 V from internal battery via boost converter. IC Role / Device Role / Timing Role: High-current boost regulator delivering stable 3.70–3.77 V intermediate rail to USB 5 V LDO, enabling compliance with USB 2.0 power delivery specs. Use Value: Maintains regulation down to 2.35 V battery voltage, preventing OTG disconnect during battery brownout - critical for field reliability. |
| LTE/3G RF Power Boost | Brownout Prevention in Smartphones |
Use Scenario: LTE power amplifier module demanding clean 3.7 V supply with <30 mVpp ripple during 100 ns edge modulation bursts. IC Role / Device Role / Timing Role: Low-noise boost regulator with 2.5 MHz fixed frequency and optimized layout guidance (SW/VOUT/PGND proximity) to suppress conducted EMI. Use Value: Achieves <50 mVpp ripple at 1000 mA using only 20 µF total COUT - meets RF PA spectral mask requirements without ferrite beads or LC filters. |
Use Scenario: Main SoC voltage rail in smartphone dropping below minimum operating voltage during peak CPU/GPU load with aging battery. IC Role / Device Role / Timing Role: System-level brownout prevention IC that boosts battery voltage to maintain 3.70–3.77 V VDD_SYS during transient dips to 2.6 V VIN. Use Value: Prevents unexpected reset or crash by sustaining regulated output at 1500 mA even at 2.35 V input - validated across −40 °C to +85 °C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS610995YFFR | 3.3 V fixed output, 1.2 MHz switching, 1200 mA max load, 0.7 µH inductor required | Lower output voltage and current limit; less suitable for 3.7 V RF PA or 1500 mA OTG loads | Select if system requires lower IQ (300 nA shutdown) and can accept 3.3 V rail with reduced headroom. |
| MAX17222ATA+T | 3.7 V output option, 2.2 MHz switching, 1000 mA max load, no forced bypass mode | Lacks true bypass and low-IQ forced bypass - higher standby current (2.5 µA) and no reverse-current blocking during bypass | Choose when board space allows larger inductor and bypass functionality is non-critical for battery longevity. |
Compared with TPS610995YFFR and MAX17222ATA+T, the FAN48630UC37AX uniquely delivers 3.70–3.77 V output with 1500 mA capability, true bypass (≤10 µA), and 2.5 MHz operation - making it optimal for Li-ion-powered RF, audio, and OTG applications where voltage precision, current headroom, and ultra-low standby power are jointly required.
Availability
FAN48630UC37AX is available at Aetrix Electronics and suitable for USB OTG host power, LTE RF power supply, and smartphone brownout prevention requiring stable component supply, long-term lifecycle support, and RoHS-compliant WLCSP packaging.
Supply support for FAN48630UC37AX 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 FAN48630UC37AX belongs to the TINYBOOST® family of high-frequency synchronous boost regulators, engineered specifically for space-constrained portable electronics using advanced Li-ion batteries and demanding low-quiescent-power operation.
FAQ
What is the exact output voltage range of the FAN48630UC37AX?
The FAN48630UC37AX provides a factory-trimmed fixed output voltage range of 3.70 V to 3.77 V, with ±2% DC regulation accuracy over temperature and load. This range is specified in Table 1 of the datasheet and corresponds to the "UC37AX" suffix designation - distinct from other variants like UC35X (3.50–3.70 V) or UC45X (4.50–4.76 V).
Does the FAN48630UC37AX support true bypass mode, and how is it activated?
Yes, the FAN48630UC37AX supports true bypass mode. It activates automatically when VIN exceeds the target VOUT (3.70–3.77 V) by ≥25 mV hysteresis, or manually via the BYP pin (C1) pulled LOW. In bypass, internal P-channel switches conduct with RDS(ON) ≤ 85 mΩ, delivering VIN directly to VOUT with <10 µA quiescent current in forced bypass mode.
What is the recommended inductor value and type for the FAN48630UC37AX?
The recommended inductor is 0.47 µH with 30% tolerance, rated for ≥3.8 A saturation current (e.g., Toko DFE201612C or Cyntec PIFE20161B). The device uses valley-current limiting, so inductor saturation must accommodate short-duration peak currents up to 3.8 A during overload - critical for maintaining regulation during 1250 mA load steps.
How does the VSEL pin function on the FAN48630UC37AX?
The VSEL pin (B1) adjusts the internal output voltage reference upward in fixed increments to pre-empt load transients. When asserted, it raises VOUT_TARGET to mitigate undershoot during fast 100 ns load steps (e.g., LTE PA burst), then ramps back down after stabilization - enabling smaller COUT and improved dynamic response without sacrificing light-load efficiency.
What thermal protection features does the FAN48630UC37AX include?
The FAN48630UC37AX includes dual thermal thresholds: PG is pulled LOW at 120 °C (T120A) and released at 100 °C (T120R); full shutdown occurs at 150 °C (T150T) with 20 °C hysteresis (T150H). Junction-to-board thermal resistance is 42 °C/W, and layout must maximize AGND/PGND copper pour with thermal vias to sustain 1500 mA continuous load at +85 °C ambient.
FAN48630UC37AX 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):
- 3.7V, 3.77V
- 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)
FAN48630UC37AX FAQ
1.How can I place an order for FAN48630UC37AX through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN48630UC37AX 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 FAN48630UC37AX reliable?
The price and inventory of FAN48630UC37AX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN48630UC37AX is usually 5 days.
3.What payment methods are accepted for FAN48630UC37AX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN48630UC37AX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN48630UC37AX?
FAN48630UC37AX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN48630UC37AX 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 FAN48630UC37AX?
For technical support, including FAN48630UC37AX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN48630UC37AX requirements.
6.How does Aetrix verify that FAN48630UC37AX is sourced from the original manufacturer or authorized distributors?
All FAN48630UC37AX 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 FAN48630UC37AX meets industry standards.
7.What is the process for return or replacement of FAN48630UC37AX?
All FAN48630UC37AX units undergo pre-shipment inspection (PSI). If there is an issue with FAN48630UC37AX, 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 FAN48630UC37AX part is unused and in its original packaging.
Return procedure for FAN48630UC37AX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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