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onsemi FAN53555UC01X
- Part No.:
- FAN53555UC01X
- Manufacturer:
- onsemi
- Package:
- 20-UFBGA, WLCSP
- Datasheet:
-
FAN53555UC01X.pdf
- Description:
- IC REG BUCK PROG 5A 20WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:2,998
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Product details
Overview
FAN53555UC01X from onsemi is a digitally programmable 5 A synchronous step-down DC-DC regulator with I²C interface, fixed 2.4 MHz switching frequency, and 2.5 V–5.5 V input range. It delivers 0.90 V default output voltage, supports PFM/PWM mode auto-transition, and targets core power for mobile application processors in smartphones and tablets.
For engineers reviewing the FAN53555UC01X datasheet, pinout, applications, or equivalent options, key selection criteria include its 5 A continuous output capability, 20-bump WLCSP-1.6×2 mm package, programmable slew rate control, I²C up to 3.4 Mbps, and thermal shutdown at 150°C.
Technical Context
The FAN53555UC01X 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 input voltages (2.5–5.5 V) and loads (0–5 A). Its architecture eliminates ESR dependency, supporting low-ESR ceramic capacitors.
It operates in PFM mode below ~10 mA (quiescent current 60 µA typical), automatically switching to fixed-frequency PWM above that threshold. The EN pin controls hardware enable/disable, and VSEL selects between VSEL0/VSEL1 register banks - for FAN53555UC01X, VSEL=LOW sets 0.90 V default output without register reset on EN toggle.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 5 A continuous; enables single-chip core supply for ARM/Krait/OMAP processors |
| Switching Frequency | 2.4 MHz nominal; allows use of 330 nH inductor and compact 22 µF ×2 ceramic output caps |
| Input Voltage Range | 2.5 V to 5.5 V; compatible with single-cell Li-ion (3.0–4.2 V) and USB-powered systems |
| I²C Interface Speed | Up to 3.4 Mbps (High-Speed Mode); supports dynamic voltage scaling during processor DVFS transitions |
| Default Output Voltage | 0.90 V (VSEL = LOW); matches common low-voltage core domains for mobile SoCs |
| Quiescent Current | 60 µA typical in PFM mode; extends battery runtime in standby/sleep states |
| Thermal Shutdown | 150°C with 17°C hysteresis; protects die under sustained overload or poor PCB thermal design |
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 VSEL0 register bank (0.90 V default); LOW = active for FAN53555UC01X |
| A2 | EN | Hardware enable; LOW = shutdown (ISD < 5 µA), registers retained |
| A3 | SCL | I²C clock input; supports up to 3.4 Mbps High-Speed Mode |
| 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 |
| B4 | AGND | Analog ground reference; isolated from high-dV/dt paths to minimize noise coupling |
| D1–D2, E1–E2 | VIN | Main input power rail; connects to CIN with shortest possible path to reduce EMI |
| D3–D4, E3–E4 | SW | Switching node; connects to inductor; high di/dt path requiring tight layout |
Key Features
| Feature | Design Value |
|---|---|
| Digitally programmable output | 0.6–1.23 V in 10 mV steps via I²C; enables precise DVFS for power-optimized SoC operation |
| Programmable slew rate | Eight selectable rates (0.5–64 mV/µs); prevents overshoot/undershoot during voltage transitions |
| PFM/PWM seamless transition | Auto-switching maintains >80% efficiency from 10 mA to 5 A; no audible noise or regulation discontinuity |
| Internal soft-start | Ramped reference limits inrush current; supports safe startup into pre-biased outputs |
| Input UVLO & OVP | UVLO at 2.4 V (350 mV hysteresis); OVP shutdown at 6.15 V; protects against battery overcharge or adapter faults |
| Thermal & current protection | 150°C shutdown with 17°C hysteresis; peak current limit (7.4 A typical) prevents MOSFET damage during short-circuit |
Applications
| Smartphone Application Processor Core Power | Tablet GPU Voltage Scaling |
|---|---|
Use Scenario: Powers ARM Cortex-A series CPU cores in battery-operated smartphones with dynamic frequency scaling. IC Role / Device Role / Timing Role: Primary core voltage regulator delivering 0.90 V @ 5 A with I²C-controlled DVFS transitions. Use Value: Enables real-time voltage adjustment matching CPU workload, reducing dynamic power by up to 30% versus fixed-output regulators. | Use Scenario: Supplies graphics processing unit (GPU) in Android tablets requiring rapid voltage changes during rendering bursts. IC Role / Device Role / Timing Role: Synchronous buck converter with programmable slew rate controlling GPU VDD during frame-rate-dependent DVFS. Use Value: 8 mV/µs slew rate option prevents GPU logic errors during sub-100 ns load transients while maintaining <±40 mV regulation window. |
| Ultra-Mobile PC SoC Platform Power | Mobile Gaming Device Application Processor |
Use Scenario: Delivers core voltage to Intel Atom or Qualcomm Snapdragon SoCs in fanless ultra-mobile PCs. IC Role / Device Role / Timing Role: High-efficiency 2.4 MHz regulator minimizing external component count and board area in space-constrained designs. Use Value: 330 nH inductor + 44 µF total COUT achieves full 5 A capability in <12 mm² footprint, critical for thin-profile chassis. | Use Scenario: Powers application processor in handheld gaming devices with aggressive thermal limits and burst-mode workloads. IC Role / Device Role / Timing Role: Digitally programmable buck with PFM mode sustaining >80% efficiency at 10 mA idle current. Use Value: 60 µA quiescent current extends gameplay time between charges; thermal shutdown prevents throttling during sustained 5 A loads. |
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 |
|---|---|---|---|
| TPS628641RQYR | 4 A max output, 2.5 MHz, I²C interface, 0.3–1.5375 V programmable range in 6.25 mV steps | Lacks PFM mode; fixed PWM only - higher light-load IQ (~12 µA vs. 60 µA) | Preferred when constant-frequency operation is mandatory and 4 A suffices |
| RTQ2132BGQW | 5 A, 2 MHz, I²C, 0.5–1.5 V in 10 mV steps; includes PMBus v1.3 support and telemetry registers | Requires external compensation; larger 24-pin QFN (3×3 mm) vs. WLCSP | Chosen when system-level telemetry (temperature, current, voltage monitoring) is required |
Compared with TPS628641RQYR and RTQ2132BGQW, the FAN53555UC01X offers superior light-load efficiency via PFM mode, smallest footprint (1.6×2 mm WLCSP), and native 0.90 V default output optimized for mobile SoC core rails - making it ideal for space- and battery-life-constrained handheld platforms.
Availability
FAN53555UC01X is available at Aetrix Electronics and suitable for smartphone core power, tablet GPU voltage scaling, and ultra-mobile PC SoC platform power requiring stable component supply, long-term lifecycle support, and consistent parametric performance.
Supply support for FAN53555UC01X 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 FAN53555UC01X belongs to onsemi's TinyBuck® family - engineered specifically for high-current, space-constrained mobile and portable electronics where digital programmability, ultra-small footprint, and adaptive efficiency are critical.
FAQ
What is the default output voltage of the FAN53555UC01X and how is it set?
The FAN53555UC01X has a factory-default output voltage of 0.90 V, configured via the VSEL0 register bank. This value is selected when the VSEL pin is held LOW at power-on. Unlike some variants (e.g., 04/24), the FAN53555UC01X retains register values during EN pin toggling, allowing persistent configuration across sleep/wake cycles without reprogramming.
Does the FAN53555UC01X support dynamic voltage scaling (DVS) via I²C?
Yes, the FAN53555UC01X supports full DVS through its I²C interface (up to 3.4 Mbps). It allows real-time reprogramming of output voltage in 10 mV steps across 0.6–1.23 V, slew rate selection (0.5–64 mV/µs), PFM/PWM mode control, and enable/disable commands - all essential for coordinated DVFS with application processors.
What package type and dimensions does the FAN53555UC01X use?
The FAN53555UC01X uses a 20-bump Wafer-Level Chip Scale Package (WLCSP) measuring 1.6 mm × 2.0 mm with 0.4 mm bump pitch. This ultra-compact package minimizes PCB area and thermal resistance, making it suitable for thin-profile mobile devices where board space is at a premium.
How does the FAN53555UC01X manage efficiency across load ranges?
The FAN53555UC01X maintains >80% efficiency from 10 mA to 5 A by automatically transitioning between PFM (for light loads, IQ = 60 µA typical) and fixed-frequency PWM (2.4 MHz at heavy loads). This dual-mode operation eliminates efficiency cliffs and ensures optimal power conversion across all operating conditions without manual mode selection.
What protection features are integrated into the FAN53555UC01X?
The FAN53555UC01X integrates input under-voltage lockout (2.4 V threshold), input over-voltage protection (6.15 V shutdown), thermal shutdown (150°C with 17°C hysteresis), cycle-by-cycle current limiting (7.4 A typical peak), and soft-start with pre-bias support - providing comprehensive fault coverage for robust mobile power delivery.
FAN53555UC01X 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):
- 0.6V
- Voltage - Output (Max):
- 1.23V
- 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)
FAN53555UC01X FAQ
1.How can I place an order for FAN53555UC01X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN53555UC01X 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 FAN53555UC01X reliable?
The price and inventory of FAN53555UC01X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN53555UC01X is usually 5 days.
3.What payment methods are accepted for FAN53555UC01X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN53555UC01X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN53555UC01X?
FAN53555UC01X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN53555UC01X 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 FAN53555UC01X?
For technical support, including FAN53555UC01X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN53555UC01X requirements.
6.How does Aetrix verify that FAN53555UC01X is sourced from the original manufacturer or authorized distributors?
All FAN53555UC01X 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 FAN53555UC01X meets industry standards.
7.What is the process for return or replacement of FAN53555UC01X?
All FAN53555UC01X units undergo pre-shipment inspection (PSI). If there is an issue with FAN53555UC01X, 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 FAN53555UC01X part is unused and in its original packaging.
Return procedure for FAN53555UC01X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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