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onsemi FAN53555UC04X
- Part No.:
- FAN53555UC04X
- Manufacturer:
- onsemi
- Package:
- 20-UFBGA, WLCSP
- Datasheet:
-
FAN53555UC04X.pdf
- Description:
- IC REG BUCK PROG 5A 20WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:2,985
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Product details
Overview
FAN53555UC04X from onsemi is a digitally programmable 5 A synchronous buck regulator with I²C interface, 2.4 MHz fixed switching frequency, and 0.603–1.411 V output voltage programmable in 12.826 mV steps. It delivers >80% efficiency from 10 mA to 5 A load, supports 2.5–5.5 V input, and targets core power for application processors in smartphones and tablets.
For engineers reviewing the FAN53555UC04X datasheet, pinout, applications, or equivalent options, key selection criteria include its register-reset-on-EN behavior, VSEL-controlled dual-voltage-set architecture, 20-bump WLCSP-1.6×2 mm package, and compatibility with low-ESR ceramic capacitors and 330 nH inductors.
Technical Context
The FAN53555UC04X uses a proprietary non-linear fixed-frequency PWM modulator with synchronous rectification, enabling fast load transient response while maintaining stable 2.4 MHz operation across 2.5–5.5 V input and 0–5 A load. Its PFM/PWM auto-mode transition occurs at ~10–50 mA depending on VIN and VOUT.
It integrates an I²C interface (up to 3.4 Mbps) supporting dynamic voltage scaling, slew rate control (0.5–64 mV/µs), soft-start, UVLO (2.4 V threshold), thermal shutdown (150 °C), and input OVP (6.2 V). The VSEL pin selects between VSEL0 (default 1.10 V) and VSEL1 (1.20 V) registers, both reset on EN low.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 5 A continuous; enables single-regulator core supply for ARM/Krait processors without parallel stages. |
| Switching Frequency | 2.4 MHz nominal; allows use of compact 330 nH inductors and 22 µF ceramic output capacitors. |
| Input Voltage Range | 2.5 V to 5.5 V; compatible with Li-ion battery (3.0–4.2 V), USB PD (5 V), and intermediate rail supplies. |
| Output Voltage Range | 0.603 V to 1.411 V in 12.826 mV steps; supports precise DVS for mobile SoCs requiring fine-grained voltage tuning. |
| I²C Interface Speed | Up to 3.4 Mbps (High-Speed Mode); enables rapid voltage updates during processor DVFS transitions. |
| Quiescent Current | 60 µA typical in PFM mode; maintains high light-load efficiency for always-on subsystems. |
| Package | 20-bump WLCSP, 1.6 × 2.0 mm; ultra-compact footprint suitable for space-constrained mobile PCBs. |
Pinout & Package
Package: 20-bump Wafer-Level Chip Scale Package (WLCSP), 1.6 mm × 2.0 mm, 0.4 mm pitch, bottom-side solder bumps.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | VSEL | Selects between VSEL0 (1.10 V default) and VSEL1 (1.20 V default); resets to defaults when EN is low. |
| A2 | EN | Active-high enable; pulls internal registers to power-up defaults on low-to-high transition for FAN53555UC04X. |
| A3 | SCL | I²C clock input; supports standard/fast/fast-plus/high-speed modes up to 3.4 Mbps. |
| A4 | VOUT | Regulated output sense node; must connect directly to COUT with minimal trace length. |
| B1 | SDA | I²C data bidirectional line; requires external pull-up resistor per I²C bus requirements. |
| B2–B3, C1–C4 | GND | Power ground return for low-side MOSFET and input/output capacitors; multiple connections reduce impedance. |
| B4 | AGND | Analog ground reference for internal circuitry; isolated from noisy digital/power paths to minimize noise coupling. |
| D1–D2, E1–E2 | VIN | Main input power connection; connects to 2.5–5.5 V source and local 10 µF CIN capacitor. |
| D3–D4, E3–E4 | SW | Switching node; connects to inductor; high dV/dt node requiring tight layout and minimal loop area. |
Key Features
| Feature | Design Value |
|---|---|
| Digitally programmable output | 0.603–1.411 V in 12.826 mV steps via I²C; enables precise DVS for ARM/Krait CPU cores. |
| Register reset on EN low | All configuration registers revert to factory defaults (VSEL0=1.10 V, VSEL1=1.20 V) upon EN deassertion - critical for deterministic boot sequencing. |
| Programmable slew rate | Eight selectable rates (0.5–64 mV/µs); prevents overshoot/undershoot during voltage transitions under varying load conditions. |
| PFM/PWM auto-mode | Automatic transition below ~50 mA load; sustains >80% efficiency from 10 mA to 5 A without manual mode control. |
| Thermal and overload protection | 150 °C thermal shutdown with 17 °C hysteresis; current limit triggers shutdown after 16 consecutive cycles to prevent MOSFET damage. |
Applications
| Smartphone Application Processor Core Power | Tablet GPU Voltage Scaling |
|---|---|
Use Scenario: Powers ARM Cortex-A series CPU cores in flagship smartphones requiring dynamic voltage/frequency scaling (DVFS) across performance states. IC Role / Device Role / Timing Role: Primary core buck regulator delivering 0.6–1.4 V at up to 5 A with sub-100 ns load transient response. Use Value: Enables energy-efficient operation by matching voltage precisely to computational demand, reducing dynamic power by up to 30% versus fixed-voltage solutions. | Use Scenario: Supplies graphics processing unit (GPU) in Android tablets where voltage must scale rapidly during gaming or UI rendering. IC Role / Device Role / Timing Role: Digitally reprogrammable buck converter with 3.4 Mbps I²C interface for real-time GPU voltage updates synchronized to frame rendering. Use Value: Achieves <±40 mV load transient deviation at 1.5 A step, ensuring stable GPU clocks and preventing visual artifacts or frame drops. |
| Ultra-Mobile PC SoC I/O Ring Supply | Embedded DSP Power in Portable Audio Devices |
Use Scenario: Provides regulated I/O ring voltage for Intel Atom or ARMADA SoCs in fanless ultra-mobile PCs with strict thermal budgets. IC Role / Device Role / Timing Role: High-efficiency synchronous buck regulator operating in PFM mode at idle and PWM at full load to minimize system quiescent power. Use Value: Maintains >80% efficiency down to 10 mA, extending battery life in always-connected standby states without compromising peak performance. | Use Scenario: Powers TI C6000 or Analog Devices SHARC DSPs in battery-powered portable audio recorders requiring low-noise, stable supply. IC Role / Device Role / Timing Role: Low-ripple buck regulator with soft-start and programmable slew rate to prevent audio pop/click during power-up or mode changes. Use Value: Delivers <10 mVpp output ripple at 5 A with 44 µF total COUT, eliminating audible noise in analog signal chain components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62933RTER | 3 A max output, 1.8–5.5 V input, 0.4–1.95 V output; 2.25 MHz switching; no VSEL pin; register retention on EN low. | Lower current rating; lacks hardware VSEL toggle; better suited for mid-power SoC I/O rails than CPU cores. | Select if 3 A suffices and deterministic register reset on EN is not required. |
| RTQ2134BGQW | 4 A max output, 2.7–5.5 V input, 0.6–1.8 V output; 2.5 MHz switching; I²C + PMBus; no VSEL pin; 16-bump WLCSP (1.53×1.53 mm). | Higher input min voltage; includes PMBus telemetry; smaller package but no hardware VSEL fallback. | Choose for telemetry-enabled designs needing input/output voltage/current monitoring. |
Compared with TPS62933RTER and RTQ2134BGQW, the FAN53555UC04X uniquely combines 5 A capability, VSEL hardware-selectable dual-register defaults, and register reset-on-EN - making it optimal for smartphone CPU core rails demanding deterministic boot voltage and robust DVFS coordination.
Availability
FAN53555UC04X is available at Aetrix Electronics and suitable for smartphone application processor core power, tablet GPU voltage scaling, and ultra-mobile PC SoC I/O ring supply requiring stable component supply and long-term production continuity.
Supply support for FAN53555UC04X 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 supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The FAN53555UC04X belongs to onsemi's TinyBuck® family of high-density, digitally programmable DC-DC regulators designed specifically for mobile and portable SoC core power with stringent size, efficiency, and dynamic response requirements.
FAQ
What is the default output voltage of the FAN53555UC04X at power-up?
The FAN53555UC04X powers up with VSEL0 = 1.10 V and VSEL1 = 1.20 V as factory defaults. When the VSEL pin is pulled low, the output is set to 1.10 V; when pulled high, it is set to 1.20 V. Both registers reset to these values each time the EN pin is driven low, ensuring deterministic boot behavior critical for mobile SoC initialization sequences.
Does the FAN53555UC04X support dynamic voltage scaling (DVS) via I²C?
Yes, the FAN53555UC04X supports full DVS via its I²C interface (up to 3.4 Mbps), allowing real-time reprogramming of output voltage in 12.826 mV steps from 0.603 V to 1.411 V. It also supports programmable slew rate control (0.5–64 mV/µs) and mode selection (PFM/PWM), enabling seamless voltage transitions synchronized with CPU frequency scaling events.
What external components are required for a basic FAN53555UC04X design?
A basic FAN53555UC04X design requires a 330 nH inductor (e.g., MMD-04ABNR33M), 44 µF total output capacitance (two 22 µF X5R 0805 capacitors), 10 µF input capacitance (X5R 0805), and a 10 nF high-frequency bypass capacitor (X7R 0402). The I²C bus requires external pull-up resistors on SDA and SCL lines per standard specifications.
How does the FAN53555UC04X handle thermal overload conditions?
The FAN53555UC04X incorporates thermal shutdown at 150 °C with 17 °C hysteresis. When junction temperature exceeds this threshold, switching halts until die temperature falls below 133 °C. Unlike simple shutdown, this feature preserves register state and resumes regulation automatically - avoiding full re-initialization and maintaining system stability during transient thermal excursions.
Is the FAN53555UC04X pin-compatible with other variants in the FAN53555 family?
Yes, all FAN53555 variants - including FAN53555UC00X, FAN53555UC05X, and FAN53555UC13X - share identical 20-bump WLCSP-1.6×2 mm packaging and pinout. This allows drop-in replacement across options differing only in default voltages, current ratings, or DAC step resolution, simplifying design reuse and BOM rationalization across product families.
FAN53555UC04X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- TinyBuck®
- Package/Case:
- 20-UFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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):
- 0.603V
- Voltage - Output (Max):
- 1.41V
- 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)
FAN53555UC04X FAQ
1.How can I place an order for FAN53555UC04X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN53555UC04X 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 FAN53555UC04X reliable?
The price and inventory of FAN53555UC04X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN53555UC04X is usually 5 days.
3.What payment methods are accepted for FAN53555UC04X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN53555UC04X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN53555UC04X?
FAN53555UC04X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN53555UC04X 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 FAN53555UC04X?
For technical support, including FAN53555UC04X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN53555UC04X requirements.
6.How does Aetrix verify that FAN53555UC04X is sourced from the original manufacturer or authorized distributors?
All FAN53555UC04X 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 FAN53555UC04X meets industry standards.
7.What is the process for return or replacement of FAN53555UC04X?
All FAN53555UC04X units undergo pre-shipment inspection (PSI). If there is an issue with FAN53555UC04X, 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 FAN53555UC04X part is unused and in its original packaging.
Return procedure for FAN53555UC04X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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