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onsemi FAN53555BUC13X
- Part No.:
- FAN53555BUC13X
- Manufacturer:
- onsemi
- Package:
- 20-UFBGA, WLCSP
- Datasheet:
-
FAN53555BUC13X.pdf
- Description:
- IC REG BUCK PROG 5A 20WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:1,473
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Product details
Overview
FAN53555BUC13X from onsemi is a digitally programmable 5 A synchronous step-down DC-DC regulator with I²C interface, fixed 2.4 MHz switching frequency, 0.8–1.43 V output range in 10 mV steps, and 2.5–5.5 V input range-designed for core voltage regulation in mobile application processors.
For engineers reviewing the FAN53555BUC13X datasheet, pinout, applications, or equivalent options, key selection criteria include its WLCSP-20 package, PFM/PWM hybrid control, 60 µA quiescent current in light-load mode, and programmable slew rate for dynamic voltage scaling in battery-powered SoC systems.
Technical Context
The FAN53555BUC13X implements a proprietary non-linear fixed-frequency PWM modulator with synchronous rectification, enabling fast load transient response while maintaining constant 2.4 MHz operation across 2.5–5.5 V input and 0–5 A load. Its architecture eliminates ESR dependency, supporting low-ESR ceramic capacitors.
It integrates an I²C-compatible interface (up to 3.4 Mbps) for real-time reconfiguration of output voltage, PFM enable/disable, slew rate, and BUCK_EN control. The device uses dual VSEL registers (VSEL0/VSEL1), with hardware VSEL pin selecting between them-defaulting to 1.15 V for both on power-up per ordering table.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 5 A continuous; supports full-core processor loads without thermal derating at +85°C ambient. |
| Switching Frequency | 2.4 MHz nominal; enables use of compact 330 nH inductors and 22 µF ×2 ceramic output capacitors. |
| Output Voltage Range | 0.8–1.43 V in 10 mV steps; matches ARM/Krait/OMAP core rail requirements with fine-grained DVS control. |
| I²C Interface Speed | Up to 3.4 Mbps (High-Speed Mode); allows rapid voltage transitions during CPU frequency scaling. |
| Quiescent Current | 60 µA typical in PFM mode; extends battery life in idle/sleep states of smartphones and tablets. |
| Package | 20-bump WLCSP, 1.6 × 2.0 mm; ultra-compact footprint for space-constrained mobile PCBs. |
| Input Voltage Range | 2.5–5.5 V; compatible with single-cell Li-ion (3.0–4.2 V) and USB-powered systems. |
Pinout & Package
Package: 20-bump Wafer-Level Chip Scale Package (WLCSP), 1.6 mm × 2.0 mm, 0.4 mm pitch, bottom-side lamination (per Note 1 in Ordering Information).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | VSEL | Selects between VSEL0 (LOW) and VSEL1 (HIGH) register sets; defaults to 1.15 V for both in FAN53555BUC13X. |
| A2 | EN | Hardware enable; device enters shutdown (<0.5 µA) when LOW; register values retained across shutdown. |
| A3 | SCL | I²C clock input; supports Standard/Fast/Fast-Plus/High-Speed modes up to 3.4 MHz. |
| A4 | VOUT | Regulated output sense node; must connect directly to COUT with minimal trace length. |
| B1 | SDA | I²C bidirectional data line; open-drain, requires external pull-up. |
| B2–B3, C1–C4 | GND | Power ground return for low-side MOSFET and input/output capacitors; multiple parallel connections reduce impedance. |
| B4 | AGND | Analog ground reference for internal circuitry; isolated from high-dV/dt digital paths to minimize noise coupling. |
| D1–D2, E1–E2 | VIN | Main input power supply; connects to 2.5–5.5 V source and CIN with shortest possible path. |
| D3–D4, E3–E4 | SW | Switching node; connects to inductor; high di/dt node requiring tight layout and copper pour. |
Key Features
| Feature | Design Value |
|---|---|
| Digitally programmable output | 0.8–1.43 V in precise 10 mV steps via I²C-enables dynamic voltage scaling for ARM cores without external DAC or resistor network. |
| PFM/PWM seamless transition | Auto-switching between 60 µA PFM (light load) and 2.4 MHz PWM (heavy load) maintains >80% efficiency from 10 mA to 5 A. |
| Programmable slew rate | Eight selectable rates (0.5–64 mV/µs); prevents overshoot/undershoot during CPU voltage transitions and meets SoC timing margins. |
| Internal soft-start | Ramped reference limits inrush current; supports safe startup into pre-biased outputs and heavy constant-current loads. |
| Comprehensive protection | Includes UVLO (2.4 V threshold), OVP (6.2 V shutdown), thermal shutdown (150°C), and cycle-by-cycle current limiting (7.4 A typical peak). |
Applications
| Smartphone Application Processor Core Rail | Tablet SoC DVFS Supply |
|---|---|
Use Scenario: Powers ARM Cortex-A series or Qualcomm Krait CPU cores in flagship smartphones during burst workloads and deep sleep. IC Role / Device Role / Timing Role: Primary core voltage regulator with I²C-controlled DVS; responds to SoC voltage requests within microseconds. Use Value: Enables 10 mV-precision voltage scaling to match CPU frequency bins, reducing dynamic power by up to 25% versus fixed-output regulators. | Use Scenario: Supplies OMAP or ARMADA application processors in Android tablets with aggressive power budget constraints. IC Role / Device Role / Timing Role: High-efficiency buck converter delivering 5 A at 1.1–1.3 V; synchronized to GPU/CPU voltage transitions via I²C. Use Value: Maintains >85% efficiency at 100 mA idle current and >90% at 3 A, extending tablet runtime by 45+ minutes per charge cycle. |
| Gaming Handheld System-on-Chip | Ultra-Mobile PC Platform Controller Hub |
Use Scenario: Regulates core voltage for NVIDIA Tegra or MediaTek gaming SoCs under sustained GPU load and thermal throttling. IC Role / Device Role / Timing Role: Digitally programmable power stage with programmable slew rate to prevent voltage droop during frame-render spikes. Use Value: Delivers 6.5 A pulse capability (shared architecture) and <±40 mV transient deviation-ensuring stable clock domains during 120 FPS rendering. | Use Scenario: Supplies Intel Atom or AMD Jaguar platform controller hub (PCH) in fanless UMPCs with strict thermal envelope. IC Role / Device Role / Timing Role: Compact 1.6×2 mm WLCSP regulator with integrated soft-start and PGOOD monitoring for system-level power sequencing. Use Value: Eliminates need for external sequencer IC; enables reliable cold-boot and reset recovery with built-in UVLO and thermal hysteresis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digitally programmable buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62864B0RQYR | 4 A output, 1.8–3.3 V programmable range via I²C, 2.2 MHz switching, 0.6 mm × 0.6 mm WLCSP-15 | Lower current rating and higher minimum output voltage; suited for I/O or auxiliary rails-not core CPU rails. | Select if system requires smaller footprint and lower cost, and core current demand is ≤4 A. |
| RTQ2132BGQW | 5 A output, 0.6–1.8 V range, PMBus interface, 2.2 MHz, 2.0×2.5 mm QFN-16 | Larger QFN package, PMBus (not I²C) protocol, no programmable slew rate; requires different firmware stack. | Select if PMBus infrastructure exists and board area permits QFN; avoid for space-constrained mobile designs. |
Compared with TPS62864B0RQYR and RTQ2132BGQW, the FAN53555BUC13X uniquely combines 5 A capability, 0.8–1.43 V 10-mV-step programmability, 2.4 MHz operation, and 1.6×2.0 mm WLCSP-making it optimal for next-gen smartphone and tablet core rail applications where size, precision, and efficiency are co-constrained.
Availability
FAN53555BUC13X is available at Aetrix Electronics and suitable for smartphone application processor core rails, tablet SoC DVFS supplies, gaming handheld SoC platforms, and ultra-mobile PC platform controller hubs requiring stable component supply, long-term lifecycle support, and consistent parametric performance.
Supply support for FAN53555BUC13X 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 (Nasdaq: ON) is a global semiconductor leader delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The FAN53555BUC13X belongs to onsemi's TinyBuck® family of high-density, digitally programmable DC-DC regulators-engineered specifically for core voltage regulation in battery-powered mobile SoCs with stringent size, efficiency, and dynamic response requirements.
FAQ
What is the default output voltage of the FAN53555BUC13X at power-up?
The FAN53555BUC13X powers up with both VSEL0 and VSEL1 registers set to 1.15 V, as specified in Table 1 of the datasheet. This default is hard-coded per the "Power-Up Defaults" column and applies regardless of VSEL pin state at POR. The output remains at 1.15 V until reprogrammed via I²C or toggled using the VSEL pin.
Does the FAN53555BUC13X support dynamic voltage scaling (DVS) with programmable slew rate?
Yes, the FAN53555BUC13X supports DVS through its I²C interface and includes eight programmable slew rates (0.5–64 mV/µs) controlled by the SLEW bits in the CONTROL register. For the FAN53555BUC13X, which uses 10 mV DVS steps, the selected slew rate applies directly-e.g., SLEW=011 yields 8.00 mV/µs-ensuring controlled transitions that meet SoC timing margins without overshoot.
What is the maximum pulse current capability of the FAN53555BUC13X?
The FAN53555BUC13X supports 5 A continuous output current but does not specify a higher pulse current rating like the 05 option (6.5 A). Per Table 1, its "Max. Pulse Current (50 ms)" field is marked "N/A", confirming it is rated only for 5 A DC operation. Designers must size thermal solution and inductor for sustained 5 A loads, not transient peaks beyond that.
Can the FAN53555BUC13X operate with ceramic output capacitors only?
Yes, the FAN53555BUC13X is explicitly designed for ceramic output capacitors. Its proprietary control architecture eliminates ESR dependency, allowing stable operation with low-ESR X5R/X7R ceramics. The recommended design uses two 22 µF, 6.3 V, 0805-case X5R capacitors (44 µF total), and additional capacitance improves transient response without compromising stability.
Is the FAN53555BUC13X pin-compatible with other variants in the FAN53555 family?
Yes, all FAN53555 variants-including FAN53555BUC13X-share identical 20-bump WLCSP-20 pinout and footprint per Figure 2 and Table 6. Hardware design is fully interchangeable across options (e.g., BUC05X, BUC13X, BUC23X); only I²C programming, default voltages, and current ratings differ. No PCB redesign is needed when migrating between variants.
FAN53555BUC13X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- TinyBuck®
- Package/Case:
- 20-UFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Last Time Buy
- 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):
- 0.8V
- Voltage - Output (Max):
- 1.43V
- Current - Output:
- 5A
- Frequency - Switching:
- 2.4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-WLCSP (1.96x1.56)
FAN53555BUC13X FAQ
1.How can I place an order for FAN53555BUC13X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN53555BUC13X 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 FAN53555BUC13X reliable?
The price and inventory of FAN53555BUC13X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN53555BUC13X is usually 5 days.
3.What payment methods are accepted for FAN53555BUC13X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN53555BUC13X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN53555BUC13X?
FAN53555BUC13X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN53555BUC13X 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 FAN53555BUC13X?
For technical support, including FAN53555BUC13X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN53555BUC13X requirements.
6.How does Aetrix verify that FAN53555BUC13X is sourced from the original manufacturer or authorized distributors?
All FAN53555BUC13X 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 FAN53555BUC13X meets industry standards.
7.What is the process for return or replacement of FAN53555BUC13X?
All FAN53555BUC13X units undergo pre-shipment inspection (PSI). If there is an issue with FAN53555BUC13X, 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 FAN53555BUC13X part is unused and in its original packaging.
Return procedure for FAN53555BUC13X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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