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onsemi FAN53555BUC23X
- Part No.:
- FAN53555BUC23X
- Manufacturer:
- onsemi
- Package:
- 20-UFBGA, WLCSP
- Datasheet:
-
FAN53555BUC23X.pdf
- Description:
- IC REG BUCK PROG 5A 20WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
FAN53555BUC23X from onsemi is a digitally programmable 5 A synchronous step-down DC-DC regulator with I²C interface, fixed 2.4 MHz switching frequency, and 0.60–1.3875 V output voltage range in 12.5 mV steps. It operates from 2.5 V to 5.5 V input, delivers >80% efficiency from 10 mA to 5 A, and targets core power delivery for mobile application processors.
For engineers reviewing the FAN53555BUC23X datasheet, pinout, applications, or equivalent options, key selection criteria include its WLCSP-20 package, programmable slew rate control, PFM/PWM auto-mode transition, 60 µA typical quiescent current, and support for 3.4 Mbps I²C communication - all critical for compact, high-efficiency battery-powered designs.
Technical Context
The FAN53555BUC23X implements a proprietary non-linear fixed-frequency PWM modulator with synchronous rectification, enabling fast load transient response independent of output capacitor ESR. Its architecture supports seamless PFM-to-PWM mode transition across 10 mA–5 A load range while maintaining constant 2.4 MHz operation under moderate-to-heavy loads.
It integrates hardware enable (EN), voltage select (VSEL) logic, and I²C-controlled registers for dynamic output voltage reprogramming, slew rate selection (0.5–64 mV/µs), and PFM enable/disable. Input under-voltage lockout (2.45 V threshold) and thermal shutdown (150 °C) provide robust system-level protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 5 A continuous; supports processor core rail requirements without external current sharing. |
| Switching Frequency | 2.4 MHz nominal; enables use of ultra-small 330 nH inductors and low-ESR ceramic capacitors. |
| Input Voltage Range | 2.5 V to 5.5 V; compatible with single-cell Li-ion, USB PD, and wide-input PMIC rails. |
| Output Voltage Range | 0.60 V to 1.3875 V in 12.5 mV steps; matches ARM/Krait/DSP core VDD requirements. |
| I²C Interface Speed | Up to 3.4 Mbps (High-Speed Mode); enables rapid dynamic voltage scaling during CPU DVFS transitions. |
| Quiescent Current | 60 µA typical in PFM mode; minimizes standby power loss in always-on subsystems. |
| Package | 20-bump WLCSP, 1.6 × 2.0 mm; optimized for space-constrained mobile PCB layouts. |
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; determines default output voltage at power-up (1.15 V for FAN53555BUC23X). |
| A2 | EN | Hardware enable input; LOW forces shutdown with register retention (non-resetting behavior per datasheet Note 1). |
| 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 be connected directly to COUT for accurate feedback. |
| 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 pins minimize impedance. |
| B4 | AGND | Analog ground reference for internal circuitry; isolated from noisy digital/power paths. |
| D1–D2, E1–E2 | VIN | Main input power supply (2.5–5.5 V); connects to CIN with minimal loop area. |
| D3–D4, E3–E4 | SW | Switching node; connects to inductor; high dV/dt node requiring tight layout control. |
Key Features
| Feature | Design Value |
|---|---|
| Digitally programmable output | 0.60–1.3875 V in precise 12.5 mV steps via I²C or VSEL pin; enables dynamic voltage scaling for ARM/Krait cores. |
| Programmable slew rate | Eight selectable rates (0.5–64 mV/µs) via CONTROL register; prevents overshoot during VDD transitions in multi-core SoCs. |
| Auto PFM/PWM mode switching | Seamless transition at ~10–50 mA load; maintains >80% efficiency from light-load standby to full 5 A operation. |
| Internal soft-start | Ramped reference limits inrush current; supports safe startup into pre-biased outputs and heavy capacitive loads. |
| Thermal & overload protection | 150 °C thermal shutdown with 17 °C hysteresis; cycle-by-cycle current limiting with 16-cycle fault timeout and auto-recovery. |
| Input UVLO & OVP | 2.45 V UVLO with 350 mV hysteresis; 6.15 V input overvoltage shutdown with noise filtering to prevent false triggers. |
Applications
| Mobile Application Processor Core Power | Ultra-Mobile PC SoC Rail |
|---|---|
|
Use Scenario: Powers ARM Cortex-A series or Qualcomm Krait CPU cores in smartphones and tablets during DVFS transitions. IC Role / Device Role / Timing Role: Primary core voltage regulator with I²C-controlled dynamic voltage scaling and sub-100 ns load transient response. Use Value: Enables energy-efficient operation across performance states while meeting tight ±40 mV transient regulation spec at 1.2 V output. |
Use Scenario: Supplies configurable VDD for Intel Atom or ARMADA SoCs in netbooks and 2-in-1 devices. IC Role / Device Role / Timing Role: High-current buck converter delivering stable 0.8–1.3 V rails with programmable startup timing and soft-start control. Use Value: Supports rapid boot sequences and thermal-aware throttling via real-time I²C voltage updates without firmware intervention. |
| Smartphone GPU Power Management | Embedded DSP Voltage Scaling |
|
Use Scenario: Delivers scalable power to Mali or Adreno GPUs during graphics-intensive workloads. IC Role / Device Role / Timing Role: Digitally programmable buck regulator synchronized with GPU clock domains for coordinated power-state changes. Use Value: Reduces GPU power consumption by 15–25% through fine-grained 12.5 mV voltage steps and controlled slew rates. |
Use Scenario: Supplies dynamically adjustable voltage to TI C6000 or Analog Devices SHARC DSPs in portable audio systems. IC Role / Device Role / Timing Role: Low-noise, high-efficiency core regulator supporting real-time voltage adaptation based on algorithmic load. Use Value: Achieves >85% efficiency at 100 mA–3 A loads while maintaining <10 mV output ripple for analog signal integrity. |
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 |
|---|---|---|---|
| TPS62933RTER | 3 A max output, 1.8–5.5 V input, 0.4–1.95 V output; 2.2 MHz switching; no PFM mode; requires external compensation. | Limited to lower-current SoC peripherals; lacks light-load PFM efficiency and integrated soft-start. | Choose for simpler designs where 3 A suffices and I²C programmability is secondary to cost. |
| RTQ2132BGQW | 4 A max output, 2.7–5.5 V input, 0.6–1.8 V output; 2.5 MHz switching; I²C interface; 10 mV steps; 50 µA IQ. | Similar feature set but narrower input range and no backside lamination (FAN53555BUC23X includes it per Table 1 Note 1). | Consider when footprint compatibility with QFN-16 is preferred over WLCSP and 5 A headroom is not required. |
Compared with TPS62933RTER and RTQ2132BGQW, the FAN53555BUC23X provides higher 5 A current capability, wider 2.5–5.5 V input range, backside lamination for improved thermal performance in thin mobile form factors, and finer 12.5 mV output resolution - making it optimal for next-generation application processor core rails demanding both density and precision.
Availability
FAN53555BUC23X is available at Aetrix Electronics and suitable for smartphone SoC power, tablet GPU rails, and ultra-mobile PC embedded systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for FAN53555BUC23X 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 manufacturer specializing in energy-efficient power management, analog, and sensor solutions for automotive, industrial, and consumer markets.
The FAN53555BUC23X belongs to onsemi's TinyBuck® family of highly integrated, digitally programmable DC-DC regulators designed specifically for space-constrained, high-performance mobile and embedded applications requiring dynamic voltage scaling and ultra-low quiescent current.
FAQ
What is the default output voltage of the FAN53555BUC23X at power-up?
The FAN53555BUC23X powers up with a default output voltage of 1.15 V, as specified in Table 1 of the datasheet for the "23" option. This value corresponds to the VSEL0 register setting and is maintained unless modified via I²C command or VSEL pin state change. The device retains register values during hardware shutdown (EN = LOW), ensuring consistent behavior across power cycles.
Does the FAN53555BUC23X support dynamic voltage scaling (DVS) via I²C?
Yes, the FAN53555BUC23X supports full dynamic voltage scaling via its I²C interface, allowing real-time reprogramming of output voltage in 12.5 mV steps across the 0.60–1.3875 V range. It also enables software control of slew rate, PFM/PWM mode, and enable/disable functions - all essential for coordinating voltage transitions with CPU/GPU performance states in mobile SoCs.
What is the maximum supported I²C speed for the FAN53555BUC23X?
The FAN53555BUC23X supports I²C High-Speed Mode up to 3.4 Mbps, as confirmed in Table 11 and the Description section. This allows rapid voltage updates during DVFS events without introducing latency bottlenecks. The interface is fully compatible with standard, fast, and fast-plus modes, providing design flexibility across host controller capabilities.
How does the FAN53555BUC23X handle thermal overload conditions?
The FAN53555BUC23X incorporates thermal shutdown protection that disables switching when junction temperature reaches 150 °C, with 17 °C hysteresis to prevent oscillation. During sustained overload, the device enters a 3-state condition and attempts automatic restart after ~1700 µs. This behavior is documented in Table 10 (TLIMIT, THYST) and the Thermal Shutdown section of the datasheet.
Is the FAN53555BUC23X pin-compatible with other variants in the FAN53555 family?
Yes, all FAN53555 variants - including FAN53555BUC23X - share identical 20-bump WLCSP-20 packaging and pinout per Figure 3 and Table 6. This allows direct substitution within the same footprint for different output voltage or current options, provided external components (e.g., inductor, capacitors) are validated for the target variant's specifications.
FAN53555BUC23X 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):
- 1.39V
- 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)
FAN53555BUC23X FAQ
1.How can I place an order for FAN53555BUC23X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN53555BUC23X 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 FAN53555BUC23X reliable?
The price and inventory of FAN53555BUC23X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN53555BUC23X is usually 5 days.
3.What payment methods are accepted for FAN53555BUC23X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN53555BUC23X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN53555BUC23X?
FAN53555BUC23X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN53555BUC23X 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 FAN53555BUC23X?
For technical support, including FAN53555BUC23X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN53555BUC23X requirements.
6.How does Aetrix verify that FAN53555BUC23X is sourced from the original manufacturer or authorized distributors?
All FAN53555BUC23X 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 FAN53555BUC23X meets industry standards.
7.What is the process for return or replacement of FAN53555BUC23X?
All FAN53555BUC23X units undergo pre-shipment inspection (PSI). If there is an issue with FAN53555BUC23X, 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 FAN53555BUC23X part is unused and in its original packaging.
Return procedure for FAN53555BUC23X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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