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onsemi FAN53525UC48X
- Part No.:
- FAN53525UC48X
- Manufacturer:
- onsemi
- Package:
- 15-UFBGA, WLCSP
- Datasheet:
-
FAN53525UC48X.pdf
- Description:
- IC REG BUCK PROG 3A 15WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:4,045
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Product details
Overview
FAN53525UC48X from ON Semiconductor is a digitally programmable 3.0 A synchronous step-down DC-DC regulator with fixed 2.4 MHz switching frequency, 2.5 V–5.5 V input range, and I²C-programmable output voltage (0.600 V–1.39375 V in 6.25 mV steps). It delivers high-efficiency power to application processors in space-constrained mobile devices.
For engineers reviewing the FAN53525UC48X datasheet, pinout, applications, or equivalent options, key selection considerations include its 15-bump WLCSP package, PFM mode quiescent current (50 µA), programmable slew rate, thermal shutdown, and UVLO protection-critical for battery-powered SoC core rail regulation.
Technical Context
The FAN53525UC48X uses synchronous rectification and proprietary control architecture to maintain >80% efficiency from 10 mA to 3.0 A load. Its fixed 2.4 MHz operation enables compact 330 nH inductors and 22 µF output capacitors while preserving stability across wide capacitance ranges up to 1.2 µH inductance.
At light loads, it automatically enters PFM mode with 50 µA typical quiescent current; at higher loads, it transitions seamlessly to fixed-frequency PWM. The I²C interface supports up to 3.4 Mbps and allows real-time DVS (Dynamic Voltage Scaling) with programmable voltage transition slew rates.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3.0 A continuous-supports high-performance ARM/Tegra/OMAP processor core rails without thermal derating. |
| Switching Frequency | 2.4 MHz fixed-enables use of sub-1 µH inductors and low-ESR ceramic capacitors for ultra-compact PCB layout. |
| Input Voltage Range | 2.5 V to 5.5 V-compatible with single-cell Li-ion, Li-poly, or regulated 3.3 V/5 V system rails. |
| Output Voltage Range | 0.600 V to 1.39375 V in 6.25 mV steps-supports precise DVS for dynamic power management in mobile SoCs. |
| I²C Interface Speed | Up to 3.4 Mbps-enables fast voltage updates during CPU frequency scaling events. |
| Quiescent Current (PFM) | 50 µA typical-minimizes standby power loss in always-on subsystems like modem or sensor hubs. |
| Package | 15-bump WLCSP, 1.310 mm × 2.015 mm, 0.4 mm pitch-designed for ultra-thin mobile PCBs with minimal board area footprint. |
Pinout & Package
15-bump Wafer-Level Chip Scale Package (WLCSP), 3×5 array, 0.4 mm ball pitch, 586 ± 39 µm height, NSMD land pattern recommended per UC015AB Rev1 drawing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input Power Supply | Accepts 2.5 V–5.5 V; requires local 4.7 µF ceramic decoupling capacitor. |
| VOUT | Regulated Output | Delivers programmable 0.6–1.39375 V; connects to 22 µF output capacitor and load. |
| GND | Power Ground | Common return for power stage and control circuitry; multiple balls (A1, A3, B2, C1, C5, D2, E1, E3) ensure low-impedance path. |
| SCL | I²C Clock Input | Open-drain, 3.4 Mbps max; requires pull-up to VDDIO (1.8 V or 3.3 V). |
| SDA | I²C Data I/O | Open-drain, bidirectional; shares same pull-up as SCL. |
| EN | Enable Input | Active-high logic control; pulls down to <0.4 V to enter shutdown (<1 µA IQ). |
| PGOOD | Power-Good Indicator | Open-drain output asserts high when VOUT is within ±8% of target; used for sequencing or fault monitoring. |
| VSEL0 / VSEL1 | Hardware Address Select | Set I²C slave address bits; FAN53525UC48X defaults to VSEL0=0.9 V, VSEL1=1.225 V per ordering table. |
Key Features
| Feature | Design Value |
|---|---|
| Digitally Programmable Output | Enables real-time DVS via I²C-reducing dynamic power by up to 40% during CPU DVFS transitions. |
| Best-in-Class Load Transient Response | Maintains <±30 mV output deviation under 1 A/µs load steps-eliminates need for large bulk capacitance. |
| PFM Mode Efficiency | 50 µA IQ at light load preserves battery runtime in idle or sleep states without sacrificing transient performance. |
| Thermal Shutdown & Overload Protection | Auto-recovery thermal limit at ~150°C prevents permanent damage during sustained overload or poor heatsinking. |
| UVLO Threshold | Undervoltage lockout at ~2.3 V prevents erratic startup or brownout operation during battery discharge. |
Applications
| Mobile Application Processors | LPDDR3 Memory Power |
|---|---|
Use Scenario: Core voltage supply for ARM Cortex-A series, Tegra, OMAP, and Krait-based SoCs in smartphones and tablets. IC Role / Device Role / Timing Role: Primary buck regulator delivering dynamically scaled core voltage under I²C-controlled DVFS. Use Value: Enables precise 6.25 mV voltage steps and programmable slew rate to match CPU frequency transitions-reducing dynamic power by up to 35% versus fixed-output regulators. | Use Scenario: VDDQ supply for LPDDR3 memory subsystems requiring tight voltage tolerance and fast transient response. IC Role / Device Role / Timing Role: High-current, low-noise point-of-load regulator with PGOOD signaling for memory initialization and error detection. Use Value: 3.0 A capability and <±30 mV load transient deviation ensure stable memory operation during burst read/write cycles without additional hold-up capacitance. |
| Ultra-Mobile PCs | Gaming Handhelds |
Use Scenario: Main SoC core rail in fanless, thermally constrained netbooks and UMPCs operating from single-cell batteries. IC Role / Device Role / Timing Role: Compact, high-efficiency buck converter with integrated thermal protection and 2.4 MHz switching for minimal filter size. Use Value: 1.31 mm × 2.015 mm WLCSP footprint saves >40% board area versus QFN alternatives-critical for thin-profile designs. | Use Scenario: GPU and CPU core supply in portable gaming devices with aggressive thermal budgets and variable workload profiles. IC Role / Device Role / Timing Role: Dual-mode (PFM/PWM) regulator supporting both low-power background tasks and high-performance rendering bursts. Use Value: Seamless PFM-to-PWM transition ensures <10 µs response to sudden load spikes-preventing frame drops or stutter during gameplay. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62260DRVR | 2.25 MHz fixed frequency, 3.0 A, 2.05–6.0 V input, I²C not supported-uses resistor-set VOUT. | Lacks digital DVS; suitable for static-voltage applications where firmware control is unnecessary. | Choose when I²C interface is not required and board space allows larger 2 mm × 2 mm SON package. |
| RTQ2132BGQW | 2.5 MHz, 3.5 A, 2.5–5.5 V input, I²C-compatible, but 12-ball WLCSP (1.2 mm × 1.6 mm) and different pinout. | Higher current rating and smaller footprint, but requires PCB redesign due to non-pin-compatible layout. | Consider for next-gen designs needing higher current headroom and tighter integration-requires new layout and firmware adaptation. |
Compared with TPS62260DRVR and RTQ2132BGQW, the FAN53525UC48X uniquely combines I²C-based DVS, 15-ball WLCSP compatibility with existing Fairchild/ON footprint, and best-in-class transient response-making it optimal for legacy and new mobile SoC designs requiring firmware-controlled voltage agility.
Availability
FAN53525UC48X is available at Aetrix Electronics and suitable for smartphone SoC core rails, LPDDR3 memory power delivery, and ultra-mobile PC main power conversion requiring stable component supply, long-term lifecycle support, and qualified wafer-level packaging.
Supply support for FAN53525UC48X 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
ON Semiconductor (formerly Fairchild Semiconductor) is a global leader in energy-efficient semiconductor solutions, serving automotive, industrial, cloud computing, and mobile markets with differentiated analog, power, and sensing technologies.
The FAN53525UC48X belongs to ON Semiconductor's TinyBuck® family of highly integrated, digitally programmable DC-DC regulators-designed specifically for dynamic voltage scaling in advanced mobile and embedded application processors.
FAQ
What is the default output voltage setting for FAN53525UC48X at power-up?
The FAN53525UC48X powers up with VSEL0 = 0.9 V and VSEL1 = 1.225 V, resulting in a default output voltage of 0.900 V. This value is factory-trimmed and stored in nonvolatile configuration registers. The FAN53525UC48X retains this setting until overwritten via I²C command, enabling reliable boot sequencing without external configuration circuitry.
Does FAN53525UC48X support forced PWM mode, and how is it enabled?
Yes, FAN53525UC48X supports forced PWM mode to disable automatic PFM entry. This is configured via I²C register bit PWM_EN (address 0x01, bit 4). When set, the regulator operates exclusively at 2.4 MHz regardless of load, eliminating PFM-related output ripple variation-critical for noise-sensitive RF or audio subsystems powered from the same rail as FAN53525UC48X.
What is the maximum recommended inductor value for stable operation of FAN53525UC48X?
The FAN53525UC48X supports inductors up to 1.2 µH while maintaining loop stability and transient performance, as confirmed in the datasheet's "Additional Output Capacitance" section. Using 1.2 µH with increased output capacitance improves load transient regulation but extends recovery time slightly. For optimal balance, 330 nH (Toko DFR201612 C-R33N) is recommended for most 3.0 A applications using FAN53525UC48X.
How does the PGOOD signal on FAN53525UC48X behave during startup and fault conditions?
The PGOOD signal on FAN53525UC48X is an open-drain output that remains low until VOUT reaches and sustains ≥92% of the programmed target voltage for ≥1 ms. It goes low again during UVLO, thermal shutdown, or overload faults. This behavior allows safe system sequencing and fault logging in host processors-ensuring downstream logic only activates after FAN53525UC48X has established a valid, regulated rail.
Is the FAN53525UC48X pinout compatible with other variants in the FAN53525 family, such as FAN53525UC96X?
Yes, all FAN53525 variants-including FAN53525UC48X and FAN53525UC96X-share identical 15-bump WLCSP pinout, mechanical dimensions, and land pattern per UC015AB Rev1. Differences are limited to factory-default VSEL settings and orderable part number encoding; no PCB redesign is needed when substituting between FAN53525UC48X and other FAN53525 family members.
FAN53525UC48X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- TinyBuck®
- Package/Case:
- 15-UFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Programmable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 1.39V
- Current - Output:
- 3A
- Frequency - Switching:
- 2.4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 15-WLCSP (2.02x1.31)
FAN53525UC48X FAQ
1.How can I place an order for FAN53525UC48X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN53525UC48X 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 FAN53525UC48X reliable?
The price and inventory of FAN53525UC48X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN53525UC48X is usually 5 days.
3.What payment methods are accepted for FAN53525UC48X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN53525UC48X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN53525UC48X?
FAN53525UC48X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN53525UC48X 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 FAN53525UC48X?
For technical support, including FAN53525UC48X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN53525UC48X requirements.
6.How does Aetrix verify that FAN53525UC48X is sourced from the original manufacturer or authorized distributors?
All FAN53525UC48X 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 FAN53525UC48X meets industry standards.
7.What is the process for return or replacement of FAN53525UC48X?
All FAN53525UC48X units undergo pre-shipment inspection (PSI). If there is an issue with FAN53525UC48X, 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 FAN53525UC48X part is unused and in its original packaging.
Return procedure for FAN53525UC48X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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