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onsemi FAN48615UC11X
- Part No.:
- FAN48615UC11X
- Manufacturer:
- onsemi
- Package:
- 9-UFBGA, WLCSP
- Datasheet:
-
FAN48615UC11X.pdf
- Description:
- IC REG BOOST 5.4V 1A 9WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:2,960
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Product details
Overview
FAN48615UC11X from onsemi is a fixed-output, synchronous TinyBoost regulator designed to generate a stable 5.40 V rail from single-cell Li-ion batteries (2.7–5.5 V input), supporting up to 1000 mA load with PWM-only control and forced pass-through operation via EN pin-used in portable audio amplifiers and NFC power rails.
For engineers reviewing the FAN48615UC11X datasheet, pinout, applications, or equivalent options, key selection criteria include output voltage accuracy (±2%), switching frequency (1.8–2.8 MHz), RDS(ON) of boost switch (63 mΩ) and sync rectifier (52 mΩ), true load disconnect, and WLCSP-9 package thermal resistance (50 °C/W).
Technical Context
The FAN48615UC11X implements current-mode PWM control with automatic transition between Linear Startup (LIN), Soft-Start (SS), Boost (BST), and Pass-Through (PT) modes. It uses internal N-channel boost switch and P-channel synchronous rectifier, enabling high efficiency (up to 97%) and low quiescent current (95 µA).
Pass-through activation occurs either automatically when VIN exceeds VOUT (5.40 V) or forcibly via EN pin pull-low after startup; fault protection includes valley current limiting, UVLO (2.20 V with 150 mV hysteresis), over-temperature shutdown (150 °C), and short-circuit detection via VIN–VOUT differential monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.40 V ±2% DC accuracy across 2.7–4.5 V input range-ensures stable rail for Class-D amplifiers and RF front-ends. |
| Max Output Current | 1000 mA continuous-supports high-pulse loads in smart phone boost applications without external current sensing. |
| Switching Frequency | 1.8–2.8 MHz typical at 300 mA load-enables use of compact 470 nH inductor and minimizes EMI in space-constrained layouts. |
| RDS(ON) (Boost Switch) | 63 mΩ typical-reduces conduction loss during boost phase, critical for >95% efficiency at mid-load. |
| RDS(ON) (Sync Rectifier) | 52 mΩ typical-lowers forward drop in pass-through mode, minimizing voltage drop (<300 mV threshold for fault detection). |
| Quiescent Current | 95 µA at zero load, EN = 1.8 V-extends battery life in always-on portable devices. |
| UVLO Threshold | 2.20 V rising with 150 mV hysteresis-prevents erratic startup near battery depletion while avoiding premature shutdown. |
Pinout & Package
Package: 9-bump Wafer-Level Chip-Scale Package (WLCSP), 1.215 × 1.215 mm, 0.4 mm pitch, 0.38 mm height (Case 567QW). Thermal resistance θJA = 50 °C/W on 4-layer JEDEC-compliant board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1, A2 | VOUT | Regulated 5.40 V output terminals-must connect directly to COUT anode with minimal trace length to reduce ripple and ESR-induced instability. |
| A3 | VIN | Main input from Li-ion battery (2.7–5.5 V)-connects to CIN cathode and supplies internal logic and power stage. |
| B1, B2 | SW | Switching node tied to inductor-carries high di/dt; requires tight loop area with PGND to minimize EMI and voltage overshoot. |
| B3 | EN | Digital enable with VIH = 1.05 V, VIL = 0.4 V-pulling LOW after startup forces immediate pass-through; cannot initiate startup in pass-through mode. |
| C1, C2 | PGND | Power ground return for COUT and internal FETs-must be connected to COUT cathode with shortest possible path to limit ground bounce. |
| C3 | AGND | Analog reference for error amplifier and modulator-tie to PGND at single point only to avoid noise coupling into regulation loop. |
Key Features
| Feature | Design Value |
|---|---|
| Forced Pass-Through via EN | EN pin pull-low after startup enables direct VIN-to-VOUT conduction with <300 mV drop-eliminates switching loss during high-input conditions. |
| True Load Disconnect | Internal isolation between VIN and VOUT when disabled-prevents backfeed and leakage into powered-down system rails. |
| Synchronous Rectification | Integrated P-channel MOSFET replaces Schottky diode-reduces forward voltage drop by ~300 mV vs. discrete solution, improving light-load efficiency. |
| Three-External-Component Design | Only 470 nH inductor + 10 µF CIN (0402) + 10 µF COUT (0603) required-minimizes BOM count and PCB footprint for ultra-portable designs. |
| Short-Circuit Protection | VIN–VOUT differential comparator triggers fault if drop exceeds 300 mV-protects downstream circuitry without external sensing resistors. |
Applications
| Class-D Audio Amplifier Power Rail | NFC Transceiver Boost Supply |
|---|---|
Use Scenario: Powers Class-D amplifier ICs requiring stable 5.4 V from declining Li-ion battery (3.0–4.2 V). IC Role / Device Role / Timing Role: Fixed-output synchronous boost regulator providing regulated rail with fast transient response and low output ripple. Use Value: Maintains amplifier THD+N performance across full battery discharge curve; 97% peak efficiency extends playback time. |
Use Scenario: Supplies 5.4 V to NFC controller ICs (e.g., NXP PN7150) during active communication bursts. IC Role / Device Role / Timing Role: High-frequency boost converter delivering pulsed 1000 mA loads with <440 µs startup to regulation. Use Value: Enables reliable field generation and data exchange even as battery drops below 3.3 V; true load disconnect prevents standby leakage. |
| Smartphone Camera Flash Driver | Portable Medical Sensor Interface |
Use Scenario: Drives white LED flash arrays requiring precise 5.4 V with minimal thermal rise in thin bezel form factor. IC Role / Device Role / Timing Role: Compact WLCSP-9 boost regulator operating in PWM-only mode with forced pass-through during idle. Use Value: 1.215 × 1.215 mm footprint fits under camera module; 50 °C/W θJA allows sustained 800 mA flash pulses without derating. |
Use Scenario: Powers analog front-end (AFE) and signal chain components in handheld biosensors running from single-cell battery. IC Role / Device Role / Timing Role: Low-noise, high-accuracy boost supply with AGND/PGND separation to preserve ADC SNR. Use Value: ±2% VOUT accuracy ensures consistent sensor excitation; soft-start prevents inrush-induced AFE reset during power-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output synchronous boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61291DRVR | 5.0 V fixed output, 1.2 MHz switching, 1200 mA max, 1.2 × 1.6 mm DSBGA | Lacks forced pass-through; no EN-controlled mode transition-requires external logic for bypass functionality. | Select when strict 5.0 V rail is needed and pass-through is not required; higher current rating suits longer-duration loads. |
| MAX17222ELT+T | 5.0 V fixed output, 2.5 MHz switching, 500 mA max, 1.61 × 1.61 mm WLP | Lower current capability and no true load disconnect-leakage path remains during disable. | Choose for cost-sensitive, lower-current applications where footprint tolerance allows larger WLP package. |
Compared with TPS61291DRVR and MAX17222ELT+T, the FAN48615UC11X uniquely delivers 5.4 V output with integrated forced pass-through, true load disconnect, and 1000 mA capability in the smallest WLCSP-9 footprint-making it optimal for space-constrained, high-efficiency portable systems requiring dynamic rail management.
Availability
FAN48615UC11X is available at Aetrix Electronics and suitable for Class-D audio amplifiers, NFC transceivers, smartphone flash drivers, and portable medical sensor interfaces requiring stable component supply, long-term lifecycle support, and Pb-free compliance.
Supply support for FAN48615UC11X 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, and IoT applications.
The FAN48615 belongs to onsemi's TinyBoost regulator product line-designed specifically for ultra-compact, high-efficiency DC-DC conversion in battery-powered portable electronics with stringent size and thermal constraints.
FAQ
What is the exact output voltage of the FAN48615UC11X?
The FAN48615UC11X provides a fixed 5.40 V output with ±2% DC accuracy across 2.7–4.5 V input range and load currents from 0 to 1000 mA. This value is laser-trimmed at wafer test and confirmed in Table 6 of the datasheet under VREG parameter-distinct from the 5.25 V variant (FAN48615UC08X).
Does the FAN48615UC11X support automatic pass-through mode?
Yes, the FAN48615UC11X automatically enters Pass-Through Mode when VIN exceeds 5.40 V and no switching has occurred for 5 seconds. During this mode, the internal P-channel MOSFET fully enhances to create a low-impedance path from VIN to VOUT, reducing conduction loss-verified in Figure 18 and Section "Pass-Through Mode" of the datasheet.
What is the recommended inductor for the FAN48615UC11X?
The recommended inductor is a 470 nH, 2016 metric (2.0 × 1.6 mm), 1.0 mm height shielded inductor with 26 mΩ DCR-specifically TOKO part DFE201610E-R47M. This value is validated in Table 1 and Figures 4–17 for optimal efficiency, transient response, and thermal performance at 1000 mA load.
How does the FAN48615UC11X handle short-circuit conditions?
The FAN48615UC11X detects short circuits by monitoring the VIN–VOUT differential; if the drop exceeds 300 mV after soft-start completion, it enters Fault State, disables switching, and initiates a 20 ms auto-restart timer. This protection is implemented via internal comparator-not external components-as detailed in Section "Fault State" and Table 3.
Can the FAN48615UC11X be used with input voltages below 2.7 V?
No-the absolute minimum input voltage is 2.7 V per Table 4 (Recommended Operating Conditions), and UVLO activates at 2.20 V (Table 6). Operation below 2.7 V violates recommended conditions and may cause unstable regulation or failure to enter Boost Mode; the device will remain latched in Fault State if VIN falls below VUVLO during operation.
FAN48615UC11X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- TinyBoost®
- Package/Case:
- 9-UFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Last Time Buy
- 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):
- 5.4V
- 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)
FAN48615UC11X FAQ
1.How can I place an order for FAN48615UC11X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN48615UC11X 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 FAN48615UC11X reliable?
The price and inventory of FAN48615UC11X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN48615UC11X is usually 5 days.
3.What payment methods are accepted for FAN48615UC11X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN48615UC11X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN48615UC11X?
FAN48615UC11X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN48615UC11X 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 FAN48615UC11X?
For technical support, including FAN48615UC11X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN48615UC11X requirements.
6.How does Aetrix verify that FAN48615UC11X is sourced from the original manufacturer or authorized distributors?
All FAN48615UC11X 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 FAN48615UC11X meets industry standards.
7.What is the process for return or replacement of FAN48615UC11X?
All FAN48615UC11X units undergo pre-shipment inspection (PSI). If there is an issue with FAN48615UC11X, 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 FAN48615UC11X part is unused and in its original packaging.
Return procedure for FAN48615UC11X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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