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onsemi FAN53555UC09X
- Part No.:
- FAN53555UC09X
- Manufacturer:
- onsemi
- Package:
- 20-UFBGA, WLCSP
- Datasheet:
-
FAN53555UC09X.pdf
- Description:
- IC REG BUCK PROG 5A 20WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
FAN53555UC09X from onsemi is a digitally programmable 3 A synchronous step-down DC-DC regulator with I²C interface, 2.4 MHz fixed switching frequency, and 0.603–1.411 V output voltage range in 12.826 mV steps. It delivers high efficiency (>80%) from 2.5 V to 5.5 V input for core processor power in compact handheld devices.
For engineers reviewing the FAN53555UC09X datasheet, pinout, applications, or equivalent options, key selection criteria include its 3 A RMS current rating, WLCSP-20 package footprint, programmable slew rate control, PFM/PWM mode flexibility, and I²C-compatible 3.4 Mbps interface for dynamic voltage scaling in battery-powered systems.
Technical Context
The FAN53555UC09X implements a proprietary non-linear fixed-frequency PWM modulator with synchronous rectification, enabling fast load transient response independent of output capacitor ESR. Its 2.4 MHz nominal switching frequency supports ultra-small external components - 330 nH or 470 nH inductors and minimal ceramic capacitance.
It operates in auto PFM/PWM mode: entering single-pulse PFM below ~10–50 mA (typical quiescent current 60 µA), then seamlessly transitioning to fixed-frequency PWM at higher loads. The 09 option features hardware-enforced 3 A maximum RMS output current and uses VSEL pin to toggle between two I²C-programmable voltage registers (1.10 V default each).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5 V to 5.5 V - supports single-cell Li-ion and USB-powered systems without pre-regulation. |
| Output Current (RMS) | 3 A - validated for sustained operation per datasheet Table 4 and Table 8; lower than 5 A variants due to thermal/footprint optimization. |
| Switching Frequency | 2.4 MHz (2.05–2.75 MHz) - enables use of sub-1 µH inductors and 0603/0402 MLCCs for space-constrained layouts. |
| Output Voltage Range | 0.603 V to 1.411 V in 12.826 mV steps - supports precise core voltage tuning for ARM/Krait processors with DVS. |
| I²C Interface Speed | Up to 3.4 Mbps (High-Speed Mode) - allows rapid voltage updates during CPU frequency scaling events. |
| Quiescent Current | 60 µA (typical, PFM mode) - maintains high light-load efficiency critical for standby and low-power states. |
| Thermal Shutdown | 150 °C with 17 °C hysteresis - protects die under sustained overload or poor PCB thermal design. |
Pinout & Package
Package: 20-bump, 1.6 mm × 2.0 mm, Wafer-Level Chip Scale Package (WLCSP) with 0.4 mm pitch - optimized for ultra-thin mobile PCBs and minimal board area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | VSEL | Selects between VSEL0/VSEL1 register banks; HIGH = VSEL1 (1.10 V default), LOW = VSEL0 (1.10 V default); no PGOOD function on 09 option. |
| A2 | EN | Hardware enable; LOW = shutdown (<1 µA ISD), registers retained; no reset-on-enable behavior (unlike 04/24 options). |
| 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 shortest possible trace for stability. |
| B1 | SDA | I²C bidirectional data line; open-drain, requires external pull-up; supports multi-master arbitration. |
| B2–B3, C1–C4 | GND | Power ground return for low-side MOSFET and input/output capacitors; multiple pins reduce impedance and improve EMI. |
| B4 | AGND | Analog ground reference for internal circuitry; isolated from noisy power GND paths to minimize noise coupling. |
| D1–D2, E1–E2 | VIN | Main input supply (2.5–5.5 V); connects to CIN with minimal loop area to limit high di/dt noise. |
| D3–D4, E3–E4 | SW | Switching node; connects to inductor; high dv/dt node requiring tight layout and guard ring for EMI control. |
Key Features
| Feature | Design Value |
|---|---|
| Digitally programmable output | Configurable via I²C to 0.603–1.411 V in 12.826 mV steps - enables precise DVS for performance/power trade-offs in application processors. |
| Programmable slew rate | Eight selectable rates (0.5–64 mV/µs) via CONTROL register - prevents overshoot/undershoot during voltage transitions and reduces system-level EMI. |
| Auto PFM/PWM mode | Seamless transition between 60 µA-quiescent PFM and 2.4 MHz PWM - sustains >80% efficiency from 10 mA to 3 A load range. |
| Internal soft-start | Ramped reference minimizes inrush current and prevents output overshoot - supports safe startup into pre-biased loads. |
| Comprehensive protection | Includes UVLO (2.45 V threshold), OVP (6.15 V shutdown), thermal shutdown (150 °C), and cycle-by-cycle current limiting (4.75 A peak). |
Applications
| Smartphones | Tablets & Ultra-Mobile PCs |
|---|---|
Use Scenario: Powering application processor cores (e.g., ARM Cortex-A series) during burst-mode operation with dynamic voltage/frequency scaling. IC Role / Device Role / Timing Role: Primary core voltage regulator delivering 3 A peak current at sub-1.2 V with <100 ns load transient response. Use Value: Enables 30%+ reduction in SoC active power by dynamically lowering VDD during low-compute intervals while maintaining regulation stability. | Use Scenario: Supplying GPU and multimedia subsystems in thin-profile tablets where board space and thermal envelope are constrained. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator using 0603/0402 external components and 1.6×2.0 mm WLCSP footprint. Use Value: Achieves >85% efficiency at 2 A load with 470 nH inductor and 22 µF total COUT - reducing heat generation and extending battery runtime. |
| Gaming Handhelds | Li-ion–Powered Embedded Systems |
Use Scenario: Delivering stable core voltage to high-performance gaming SoCs (e.g., Qualcomm Krait, MediaTek Helio) under rapid load transients. IC Role / Device Role / Timing Role: Synchronous buck converter with 2.4 MHz switching and programmable slew rate to suppress voltage droop during frame-rendering spikes. Use Value: Limits VOUT deviation to ±40 mV during 0.1–1.5 A load steps (100 ns edge), preventing GPU throttling or frame drops. | Use Scenario: Powering FPGA or DSP cores in portable industrial controllers requiring reliable low-noise, digitally adjustable rail. IC Role / Device Role / Timing Role: Digitally controlled PMIC element supporting remote firmware-based voltage updates over I²C bus. Use Value: Eliminates need for external DAC or resistor networks - simplifies BOM and enables field calibration of supply voltage. |
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 |
|---|---|---|---|
| TPS62864B09RQYR | 3 A, 2.5 MHz, I²C, 0.3–1.5 V output; 1.22 mm × 1.22 mm WCSP; lower quiescent current (25 µA) | Requires external VSEL resistors for default voltage; lacks programmable slew rate | Preferred when ultra-low IQ and smallest footprint are critical, and slew control is not required. |
| RTQ2132BGQW | 3 A, 2.2 MHz, I²C, 0.5–1.52 V output; 2.0 mm × 2.5 mm QFN; integrated boot capacitor | Higher pin count (16-pin QFN), larger footprint, no VSEL pin for hardware register selection | Chosen when board layout allows QFN and integrated boot cap simplifies design over WLCSP routing complexity. |
Compared with TPS62864B09RQYR and RTQ2132BGQW, the FAN53555UC09X uniquely combines VSEL pin-based dual-register selection, eight-step programmable slew rate, and 1.6×2.0 mm WLCSP in a 3 A solution - making it optimal for space-limited mobile SoC power where dynamic voltage transition control is essential.
Availability
FAN53555UC09X is available at Aetrix Electronics and suitable for smartphones, tablets, and gaming handhelds requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for FAN53555UC09X 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 is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The FAN53555UC09X belongs to onsemi's TinyBuck® family of ultra-compact, high-frequency DC-DC regulators designed specifically for core power delivery in Li-ion–powered portable electronics with stringent size and efficiency requirements.
FAQ
What is the maximum continuous output current rating for the FAN53555UC09X?
The FAN53555UC09X is rated for 3 A maximum RMS output current, as specified in Table 4 ("Reduced Output Current") and confirmed in Table 8 Recommended Operating Conditions. This is lower than the 5 A rating of base variants (e.g., UC00X) due to optimized thermal and footprint constraints for handheld devices - not a derating but a defined operational limit for this specific option.
Does the FAN53555UC09X support dynamic voltage scaling (DVS) via I²C?
Yes, the FAN53555UC09X supports DVS via its I²C interface, allowing real-time reprogramming of output voltage in 12.826 mV steps across 0.603 V to 1.411 V. It also supports programmable slew rate control (eight settings) and PFM/PWM mode selection - all critical for coordinated voltage/frequency scaling in ARM/Krait application processors.
What is the default output voltage configuration of the FAN53555UC09X at power-on?
At power-on reset (POR), the FAN53555UC09X defaults to 1.10 V on both VSEL0 and VSEL1 registers, as shown in Table 1 Ordering Information. The VSEL pin determines which register is active: LOW selects VSEL0 (1.10 V), HIGH selects VSEL1 (1.10 V). No PGOOD function is present on this option - A1 is dedicated to VSEL only.
Can the FAN53555UC09X operate with a 470 nH inductor?
Yes, the FAN53555UC09X explicitly supports 470 nH inductors per Table 4 and Table 5, especially for reduced-footprint applications. Using 470 nH (vs. 330 nH) increases inductor DCR slightly but allows smaller physical size (e.g., 2016 case) and is validated for stable operation with appropriate output capacitance (e.g., 22 µF ×2 for 08/24, 22 µF ×1 for 09).
Is the FAN53555UC09X pin-compatible with other FAN53555 variants like UC00X or UC05X?
No - while all FAN53555 variants share the same WLCSP-20 package and pinout, the FAN53555UC09X is not functionally interchangeable with UC00X or UC05X due to differences in maximum current rating (3 A vs. 5 A), pulse current capability (N/A vs. 6.5 A), and default voltage programming (12.826 mV steps vs. 10 mV steps). Substituting requires validation of thermal, transient, and register compatibility.
FAN53555UC09X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 20-UFBGA, WLCSP
- Packaging:
- Bulk
- 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)
FAN53555UC09X FAQ
1.How can I place an order for FAN53555UC09X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN53555UC09X 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 FAN53555UC09X reliable?
The price and inventory of FAN53555UC09X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN53555UC09X is usually 5 days.
3.What payment methods are accepted for FAN53555UC09X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN53555UC09X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN53555UC09X?
FAN53555UC09X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN53555UC09X 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 FAN53555UC09X?
For technical support, including FAN53555UC09X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN53555UC09X requirements.
6.How does Aetrix verify that FAN53555UC09X is sourced from the original manufacturer or authorized distributors?
All FAN53555UC09X 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 FAN53555UC09X meets industry standards.
7.What is the process for return or replacement of FAN53555UC09X?
All FAN53555UC09X units undergo pre-shipment inspection (PSI). If there is an issue with FAN53555UC09X, 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 FAN53555UC09X part is unused and in its original packaging.
Return procedure for FAN53555UC09X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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