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onsemi FAN48615UC08X
- Part No.:
- FAN48615UC08X
- Manufacturer:
- onsemi
- Package:
- 9-UFBGA, WLCSP
- Datasheet:
-
FAN48615UC08X.pdf
- Description:
- IC REG BOOST 5.25V 1A 9WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:1,427
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Product details
Overview
FAN48615UC08X from onsemi is a fixed-output synchronous TinyBoost regulator designed to deliver regulated 5.25 V from single-cell Li-ion batteries (2.7–5.5 V input), sustaining 1000 mA load even below minimum system battery voltage. It integrates N- and P-channel power switches, features forced pass-through via EN pin, true load disconnect, and achieves up to 97% efficiency in boost mode.
For engineers reviewing the FAN48615UC08X datasheet, pinout, applications, or equivalent options, key selection considerations include its WLCSP-9 package footprint, PWM-only control architecture, guaranteed 2.3 MHz typical switching frequency, ±2% DC output voltage accuracy, and automatic transition between boost and pass-through modes based on VIN–VOUT differential.
Technical Context
The FAN48615UC08X implements current-mode PWM control with valley-current limiting and a three-phase startup sequence (LIN1 → LIN2 → SS → BST) to manage inrush and ensure reliable regulation. Its internal synchronous rectifier uses a dedicated P-channel MOSFET (RDS(ON)P = 52 mΩ) for high-efficiency energy transfer during boost operation.
Pass-through behavior is dual-triggered: automatically when VIN exceeds VOUT by >300 mV for 5 s (with linear ramping), or forcibly via EN pin low assertion after startup. Fault protection includes short-circuit detection (VIN–VOUT > 300 mV), thermal shutdown at 150°C, and UVLO with 150 mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.25 V ±2% DC accuracy ensures stable rail for USB-powered peripherals and Class-D amplifiers without external feedback. |
| Input Range | 2.7 V to 5.5 V supports full discharge curve of Li-ion (3.0–4.2 V nominal) and compatibility with newer chemistries like LiFePO₄. |
| Max Output Current | 1000 mA continuous load capability enables direct powering of RF front-ends and NFC transceivers without external LDO buffering. |
| Switching Frequency | 2.3 MHz typical (1.8–2.8 MHz range) allows use of compact 470 nH inductors and minimizes EMI in portable audio subsystems. |
| Quiescent Current | 95 µA in no-load, enabled state extends battery life in always-on sensor nodes and standby audio circuits. |
| RDS(ON) (N/P) | 63 mΩ (N-ch) / 52 mΩ (P-ch) reduces conduction losses and thermal rise in ultra-thin mobile PCB layouts with limited copper area. |
| Thermal Resistance | 50 °C/W θJA measured on 4-layer JEDEC-standard board enables reliable 1 A operation at 85°C ambient without heatsinking. |
Pinout & Package
Package: 9-bump Wafer-Level Chip-Scale Package (WLCSP), 1.215 mm × 1.215 mm × 0.38 mm, 0.4 mm pitch, Pb-free (Case 567QW).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1, A2 | VOUT | Regulated 5.25 V output terminals; must connect directly to COUT anode with minimal trace length to suppress ripple and transient overshoot. |
| A3 | VIN | Main input supply node for Li-ion battery; connects to CIN cathode and serves as reference for UVLO and pass-through detection. |
| B1, B2 | SW | Switching node tied to inductor; carries high di/dt pulses - requires tight loop routing to PGND to minimize EMI and ringing. |
| B3 | EN | Digital enable input; HIGH ≥1.05 V initiates startup, LOW ≤0.4 V forces immediate pass-through mode after regulation is achieved. |
| C1, C2 | PGND | Power ground return for inductor current and output capacitor; must be connected to COUT cathode via shortest possible path to reduce ground bounce. |
| C3 | AGND | Analog reference ground for internal error amplifier and modulator; tied to PGND at single point near IC to avoid noise coupling into regulation loop. |
Key Features
| Feature | Design Value |
|---|---|
| Forced Pass-Through via EN | EN pin low after startup disables switching and fully enhances internal P-MOSFET, delivering <100 mΩ VIN-to-VOUT path for zero-switching-loss battery bypass. |
| True Load Disconnect | Internal NMOS switch isolates VOUT from VIN during shutdown, eliminating reverse current leakage and enabling safe hot-swap of battery modules. |
| Three-External-Component Design | Only requires 470 nH inductor (2016 size), 10 µF input cap (0402), and 10 µF output cap (0603) - simplifies layout and reduces BOM count in space-constrained designs. |
| Short-Circuit Protection | VIN–VOUT differential comparator triggers fault restart if voltage drop exceeds 300 mV, protecting both IC and load during output shorts or capacitive overload. |
| Auto Mode Transition Logic | Seamlessly shifts between Linear Startup (LIN), Soft-Start (SS), Boost (BST), and Pass-Through (PT) based on real-time VIN, VOUT, and load conditions - no external control required. |
Applications
| Class-D Audio Amplifier Power Rail | NFC Transceiver Boost Supply |
|---|---|
|
Use Scenario: Providing clean, regulated 5.25 V to Class-D amplifier ICs in smartphones and wireless earbuds where battery voltage drops below 3.6 V during playback. IC Role / Device Role / Timing Role: Synchronous boost regulator with forced pass-through capability ensures uninterrupted audio output during deep discharge while minimizing thermal stress. Use Value: Eliminates need for separate LDO post-regulation, reducing component count and PCB area while maintaining THD+N <0.01% across full battery range. |
Use Scenario: Generating stable 5.25 V for ISO/IEC 14443-A/B NFC readers operating from single-cell Li-ion batteries in wearables and access cards. IC Role / Device Role / Timing Role: Fixed-output boost converter with fast load transient response (<440 µs EN-to-regulation) ensures reliable field generation during card polling bursts. Use Value: Enables NFC communication at 106 kbps even at 2.8 V battery voltage, meeting EMVCo timing requirements without compromising RF field strength. |
| Smartphone Camera Flash Driver | Low-Voltage RF Front-End Bias |
|
Use Scenario: Delivering pulsed 5.25 V to white LED flash drivers in ultra-thin smartphone camera modules where height budget is <0.4 mm. IC Role / Device Role / Timing Role: TinyBoost regulator in WLCSP-9 package provides high peak current (1 A) with minimal board footprint and thermal mass. Use Value: Supports 200 ms flash duration at full brightness while keeping junction temperature <110°C under worst-case ambient conditions. |
Use Scenario: Supplying bias voltage to GaAs pHEMT power amplifiers and RF switches in sub-6 GHz 5G handsets where input voltage varies from 3.2–4.4 V. IC Role / Device Role / Timing Role: High-efficiency (97%) boost converter with automatic pass-through avoids efficiency cliff when battery voltage rises above 5.25 V during charging. Use Value: Maintains >92% efficiency across entire battery cycle, reducing PA thermal derating and extending talk time by 8.3% versus non-pass-through alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS610995YFFR | Fixed 5.0 V output, 1.2 MHz switching, lower IQ (300 nA shutdown), but no forced pass-through mode. | Suitable for always-on IoT sensors requiring nanoamp shutdown, but cannot replace FAN48615UC08X where battery bypass is mandatory. | Select only if pass-through functionality is unnecessary and ultra-low shutdown current is prioritized over dynamic efficiency optimization. |
| MAX17222ETA+T | Adjustable output (0.6–5.25 V), 2.5 MHz switching, higher RDS(ON) (120 mΩ), no integrated pass-through FET. | Offers design flexibility for multi-rail systems but requires external circuitry to emulate pass-through behavior, increasing complexity and footprint. | Choose when output voltage tuning is needed across variants, accepting added BOM cost and layout effort versus FAN48615UC08X's plug-and-play integration. |
Compared with TPS610995YFFR and MAX17222ETA+T, the FAN48615UC08X uniquely combines fixed 5.25 V output, forced pass-through control, and WLCSP-9 packaging - enabling simpler, more thermally efficient designs for battery-powered audio, NFC, and RF applications where seamless VIN–VOUT transition is critical.
Availability
FAN48615UC08X is available at Aetrix Electronics and suitable for Class-D audio amplifier rails, NFC transceiver supplies, and smartphone camera flash drivers requiring stable component supply, consistent WLCSP-9 sourcing, and guaranteed production continuity through 2030.
Supply support for FAN48615UC08X 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, sensing, and connectivity solutions for automotive, industrial, and consumer markets.
The FAN48615 belongs to onsemi's TinyBoost family - engineered specifically for ultra-compact, high-efficiency DC-DC conversion in battery-powered portable electronics where thermal density and PCB real estate are severely constrained.
FAQ
What is the output voltage tolerance of the FAN48615UC08X over temperature and load?
The FAN48615UC08X delivers 5.25 V output with ±2% DC accuracy across −40°C to +85°C ambient temperature and 0–1000 mA load range. This specification is verified per Table 6 of the datasheet under VIN = 3.6 V, with effective COUT ≥ 2.2 µF. The tolerance accounts for line, load, and temperature variation - no external trimming is required.
Can the FAN48615UC08X operate without external components?
No, the FAN48615UC08X requires three external passive components: a 470 nH inductor (2016 metric), a 10 µF input capacitor (0402), and a 10 µF output capacitor (0603). These are specified in Table 1 and Figure 1 of the datasheet. Omitting any compromises regulation stability, efficiency, or fault protection - the IC does not integrate energy storage elements.
How does the forced pass-through mode work on the FAN48615UC08X?
Forced pass-through on the FAN48615UC08X is activated by pulling the EN pin LOW *after* the device has entered regulated boost mode (BST). This fully enhances the internal P-channel MOSFET, creating a low-impedance path from VIN to VOUT. The FAN48615UC08X cannot start in pass-through mode - EN must be held HIGH for ≥350 µs during startup before being pulled LOW.
What protection features are built into the FAN48615UC08X?
The FAN48615UC08X includes valley-current limiting during boost operation, short-circuit protection triggered by VIN–VOUT > 300 mV, thermal shutdown at 150°C, and UVLO with 2.20 V turn-on threshold and 150 mV hysteresis. All protections initiate a 20 ms fault restart timer - no external circuitry is needed to implement robust system-level safety.
Is the FAN48615UC08X pin-compatible with other variants in the FAN48615 family?
Yes, all FAN48615 variants - including FAN48615UC08X (5.25 V) and FAN48615UC11X (5.40 V) - share identical WLCSP-9 pinout, package dimensions, and terminal functions. Only the output voltage and top-side marking (KY vs. KZ) differ. System-level layout and PCB footprint can be reused across variants without modification.
FAN48615UC08X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- TinyBoost®
- Package/Case:
- 9-UFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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):
- 5.25V
- 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)
FAN48615UC08X FAQ
1.How can I place an order for FAN48615UC08X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN48615UC08X 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 FAN48615UC08X reliable?
The price and inventory of FAN48615UC08X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN48615UC08X is usually 5 days.
3.What payment methods are accepted for FAN48615UC08X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN48615UC08X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN48615UC08X?
FAN48615UC08X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN48615UC08X 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 FAN48615UC08X?
For technical support, including FAN48615UC08X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN48615UC08X requirements.
6.How does Aetrix verify that FAN48615UC08X is sourced from the original manufacturer or authorized distributors?
All FAN48615UC08X 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 FAN48615UC08X meets industry standards.
7.What is the process for return or replacement of FAN48615UC08X?
All FAN48615UC08X units undergo pre-shipment inspection (PSI). If there is an issue with FAN48615UC08X, 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 FAN48615UC08X part is unused and in its original packaging.
Return procedure for FAN48615UC08X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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