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onsemi FAN53555UC05X
- Part No.:
- FAN53555UC05X
- Manufacturer:
- onsemi
- Package:
- 20-UFBGA, WLCSP
- Datasheet:
-
FAN53555UC05X.pdf
- Description:
- IC REG BUCK PROG 5A 20WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:4,972
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Product details
Overview
FAN53555UC05X from onsemi is a digitally programmable 5 A synchronous buck regulator with I²C interface, fixed 2.4 MHz switching frequency, and 0.6–1.23 V output voltage range in 10 mV steps. It delivers 6.5 A pulse current capability (05 option), operates from 2.5–5.5 V input, and targets core power delivery for mobile application processors requiring fast transient response and high light-load efficiency.
For engineers reviewing the FAN53555UC05X datasheet, pinout, applications, or equivalent options, key selection criteria include its 20-bump WLCSP-1.6×2 mm package, PFM/PWM auto-mode transition, programmable slew rate, and integrated thermal/overcurrent protection - all critical for compact, battery-powered SoC power rails.
Technical Context
The FAN53555UC05X uses a proprietary non-linear fixed-frequency PWM modulator with synchronous rectification to maintain 2.4 MHz operation across load and input voltage variations while delivering 5 A continuous and 6.5 A pulse current. Its architecture eliminates ESR dependency, enabling stable ceramic capacitor use.
It integrates an I²C interface supporting up to 3.4 Mbps (High-Speed Mode), allowing dynamic reprogramming of output voltage, PFM enable/disable, and slew rate control. The device supports hardware enable via EN pin and software enable via BUCK_EN bits, with register retention during shutdown (except reset options).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 5 A continuous, 6.5 A pulse (50 ms) - enables support for CPU/GPU burst loads in mobile SoCs |
| Switching Frequency | 2.4 MHz nominal - allows ultra-small external components (330 nH inductor, 22 µF ×2 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 |
| Output Voltage Range | 0.6 V to 1.23 V in 10 mV steps - matches core voltage requirements of Arm/Krait/OMAP processors |
| I²C Interface Speed | Up to 3.4 Mbps (High-Speed Mode) - enables rapid DVS transitions during processor DVFS events |
| Quiescent Current | 60 µA typical in PFM mode - extends battery runtime during idle/sleep states |
| Package | 20-bump WLCSP, 1.6 × 2.0 mm - ultra-compact footprint 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/VSEL1 register banks; LOW = VSEL0, HIGH = VSEL1 - enables dual-voltage configuration without I²C traffic |
| A2 | EN | Hardware enable; LOW = shutdown (ISD < 1 µA), registers retained - supports system-level power sequencing |
| A3 | SCL | I²C clock input; supports Standard/Fast/Fast-Plus/High-Speed modes up to 3.4 MHz - ensures robust DVS timing |
| A4 | VOUT | Output voltage sense point; must connect directly to COUT - critical for accurate regulation under high di/dt loads |
| B1 | SDA | I²C bidirectional data line; open-drain, requires pull-up - enables read/write access to all control registers |
| B2–B3, C1–C4 | GND | Power ground; low-side MOSFET reference and CIN/COUT return path - minimizes ground bounce in high-current paths |
| B4 | AGND | Analog ground; reference for internal circuits and feedback - must be isolated from noisy digital/power grounds |
| D1–D2, E1–E2 | VIN | Main input supply (2.5–5.5 V); connects to CIN with minimal loop area - reduces EMI and input ripple |
| D3–D4, E3–E4 | SW | Switching node; connects to inductor; high dV/dt node - requires tight layout to minimize radiated emissions |
Key Features
| Feature | Design Value |
|---|---|
| Digitally programmable output | 0.6–1.23 V in 10 mV steps via I²C or VSEL pin - enables precise core voltage tuning for process/voltage/temp corners |
| Programmable slew rate | Eight selectable rates (0.5–64 mV/µs) - prevents overshoot/undershoot during DVS transitions and meets SoC ramp-rate specs |
| Auto PFM/PWM mode transition | Seamless switch at ~10 mA load - maintains >80% efficiency from 10 mA to 5 A without audible noise or regulation loss |
| Internal soft-start | ~300 µs to regulated VOUT - limits inrush current into large output capacitance and prevents input droop |
| Comprehensive protection | UVLO (2.4 V), OVP (6.2 V), thermal shutdown (150°C), and peak current limit (10 A for 05 option) - ensures robust operation under fault conditions |
Applications
| Application 1 | Application 2 |
|---|---|
Use Scenario: Core power supply for Arm-based application processors in smartphones and tablets. IC Role / Device Role / Timing Role: Primary buck regulator delivering dynamically scaled core voltage (e.g., 0.8–1.2 V) under DVFS control. Use Value: 6.5 A pulse current and 2.4 MHz switching enable fast load transients required by burst-mode CPU cores without compromising board area. | Use Scenario: Power delivery for Krait or OMAP DSP subsystems in ultra-mobile PCs. IC Role / Device Role / Timing Role: High-efficiency step-down converter supplying configurable logic voltage with I²C-based real-time adjustment. Use Value: 60 µA quiescent current in PFM mode extends battery life during low-activity periods while maintaining sub-40 mV load transient response. |
| Application 3 | Application 4 |
Use Scenario: GPU core rail in gaming handhelds with aggressive thermal constraints. IC Role / Device Role / Timing Role: Synchronous buck regulator managing high di/dt loads with integrated thermal shutdown and current limiting. Use Value: 150°C thermal shutdown with 17°C hysteresis prevents die damage during sustained GPU boost clocks, ensuring long-term reliability. | Use Scenario: System-on-chip (SoC) power management in netbooks with Li-ion battery input. IC Role / Device Role / Timing Role: Main processor buck converter operating from 3.0–4.2 V battery range with UVLO and OVP protection. Use Value: 2.5–5.5 V input range and 6.2 V OVP threshold accommodate full battery discharge curve while protecting against adapter overvoltage events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS628641RQYR | 4 A continuous, 1.8 MHz, I²C-programmable, 0.3–1.5 V output; smaller 1.2×1.6 mm QFN | Limited pulse current (5.5 A) and lower max output current - suitable for mid-tier processors but not high-performance burst loads | Choose when board space is more constrained than peak current demand and 4 A continuous suffices |
| MP2143GQZ-12 | 5 A continuous, 2.2 MHz, analog-programmable (resistor-set), no I²C; 3×3 mm QFN | No digital interface or DVS capability - requires fixed output or external DAC for voltage scaling | Choose for cost-sensitive designs where dynamic voltage scaling is unnecessary and analog control is acceptable |
Compared with TPS628641RQYR and MP2143GQZ-12, the FAN53555UC05X uniquely combines 5 A continuous + 6.5 A pulse delivery, 2.4 MHz switching, and full I²C programmability in a 1.6×2.0 mm WLCSP - making it optimal for space-limited, high-performance mobile SoC core rails demanding both burst capability and software-controlled DVS.
Availability
FAN53555UC05X is available at Aetrix Electronics and suitable for smartphone processors, tablet SoCs, ultra-mobile PC power rails, and gaming handheld GPU supplies requiring stable component supply, consistent WLCSP packaging, and guaranteed long-term availability.
Supply support for FAN53555UC05X 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 (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient power and sensing solutions for automotive, industrial, cloud, and mobile applications.
The FAN53555UC05X belongs to the TinyBuck® family of high-density, digitally programmable DC-DC regulators designed specifically for core power delivery in battery-operated mobile processors and SoCs.
FAQ
What is the maximum pulse current rating for the FAN53555UC05X?
The FAN53555UC05X supports a maximum pulse current of 6.5 A for durations up to 50 ms, as specified in the ordering information table for the "05" option. This capability is enabled by its higher peak current limit (10 A typical) and optimized thermal design, making it suitable for handling CPU/GPU burst loads in mobile devices without requiring external current boosting circuitry.
Does the FAN53555UC05X retain register settings during shutdown?
Yes, the FAN53555UC05X retains all register values when the EN pin is pulled LOW, as confirmed in Table 1 and the Operation Description section. Unlike options 04, 24, 042, and 79, the 05 variant does not reset registers on hardware shutdown - enabling seamless resume of configured output voltage, PFM mode, and slew rate after wake-up.
What is the recommended output capacitor configuration for the FAN53555UC05X?
The recommended output capacitor configuration for the FAN53555UC05X is two 22 µF, 6.3 V, X5R, 0805 ceramic capacitors (total 44 µF), as specified in Table 2. This value ensures stable regulation during load transients while maintaining compatibility with the 2.4 MHz switching frequency and low-ESR ceramic requirements.
Can the FAN53555UC05X operate with a 3.3 V input supply?
Yes, the FAN53555UC05X operates reliably with a 3.3 V input supply, as its specified input voltage range is 2.5 V to 5.5 V. At 3.3 V input and 1.2 V output, typical efficiency exceeds 88% at 2 A load (per Figure 7), and the device maintains full functionality including I²C communication, PFM/PWM mode transition, and protection features.
What is the purpose of the VSEL pin on the FAN53555UC05X?
The VSEL pin on the FAN53555UC05X selects between two pre-programmed output voltage registers: LOW selects VSEL0 (default 0.90 V), HIGH selects VSEL1 (default OFF). This hardware-selectable dual-voltage feature enables simple boot-time voltage selection or static configuration without I²C traffic, complementing full digital control via the I²C interface.
FAN53555UC05X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- TinyBuck®
- Package/Case:
- 20-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):
- 1.23V
- 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)
FAN53555UC05X FAQ
1.How can I place an order for FAN53555UC05X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN53555UC05X 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 FAN53555UC05X reliable?
The price and inventory of FAN53555UC05X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN53555UC05X is usually 5 days.
3.What payment methods are accepted for FAN53555UC05X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN53555UC05X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN53555UC05X?
FAN53555UC05X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN53555UC05X 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 FAN53555UC05X?
For technical support, including FAN53555UC05X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN53555UC05X requirements.
6.How does Aetrix verify that FAN53555UC05X is sourced from the original manufacturer or authorized distributors?
All FAN53555UC05X 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 FAN53555UC05X meets industry standards.
7.What is the process for return or replacement of FAN53555UC05X?
All FAN53555UC05X units undergo pre-shipment inspection (PSI). If there is an issue with FAN53555UC05X, 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 FAN53555UC05X part is unused and in its original packaging.
Return procedure for FAN53555UC05X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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