My Inquiry
My Account
onsemi FAN53555UC00X
- Part No.:
- FAN53555UC00X
- Manufacturer:
- onsemi
- Package:
- 20-UFBGA, WLCSP
- Datasheet:
-
FAN53555UC00X.pdf
- Description:
- IC REG BUCK PROG 5A 20WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:2,549
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
FAN53555UC00X from onsemi is a digitally programmable 5 A synchronous step-down DC-DC regulator with I²C interface, fixed 2.4 MHz switching frequency, and 0.6–1.23 V output voltage programmable in 10 mV steps. It delivers >80% efficiency from 10 mA to 5 A load, supports 330 nH inductors and 22 µF ceramic output capacitors, and targets core voltage regulation for ARM/Krait/OMAP processors in smartphones and tablets.
For engineers reviewing the FAN53555UC00X datasheet, pinout, applications, or equivalent options, key selection criteria include its 20-bump WLCSP-1.6×2 mm package, PFM/PWM auto-mode transition at light loads, 60 µA quiescent current, programmable slew rate (0.5–64 mV/µs), and I²C-compatible interface up to 3.4 Mbps.
Technical Context
The FAN53555UC00X implements a proprietary non-linear fixed-frequency PWM modulator with synchronous rectification, enabling fast load transient response independent of output capacitor ESR. Its architecture maintains constant 2.4 MHz operation across input voltages (2.5–5.5 V) and load currents (0–5 A), eliminating frequency drift seen in conventional buck controllers.
It integrates dual voltage-select registers (VSEL0/VSEL1), hardware/software enable logic (EN + BUCK_EN bits), and dynamic voltage scaling via I²C. Power-save mode uses single-pulse PFM with 60 µA typical quiescent current, while forced PWM mode draws 43 mA - critical for noise-sensitive RF or audio subsystems requiring deterministic switching.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 5 A continuous; enables single-regulator core power for high-performance mobile SoCs without parallel phases. |
| Switching Frequency | 2.4 MHz nominal; allows ultra-compact 330 nH inductor and 22 µF ceramic output capacitor footprint. |
| 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 multi-rail PMIC outputs. |
| Output Voltage Range | 0.6 V to 1.23 V in 10 mV steps; matches ARM Cortex-A series core voltage requirements with fine-grained DVS control. |
| I²C Interface Speed | Up to 3.4 Mbps (High-Speed Mode); supports rapid voltage transitions during CPU frequency scaling events. |
| Quiescent Current | 60 µA typical in PFM mode; extends battery runtime in always-on sensor or modem subsystems. |
| Package | 20-bump WLCSP, 1.6 × 2.0 mm; enables placement directly under processor die in fan-out wafer-level packaging (FO-WLP) designs. |
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 (LOW) and VSEL1 (HIGH) register banks for dual-voltage configuration; no pull-up required. |
| A2 | EN | Hardware enable: LOW forces shutdown (<1 µA supply current); registers retained except on 04/24/042/79 options. |
| A3 | SCL | I²C clock input; supports Standard/Fast/Fast Plus/High-Speed modes up to 3.4 MHz with 400 pF bus capacitance. |
| A4 | VOUT | Output voltage sense node; must connect directly to COUT anode with minimal trace length to avoid regulation error. |
| B1 | SDA | I²C bidirectional data line; open-drain structure requires external pull-up to VDD (1.8 V typical). |
| 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 DAC and error amplifier; isolated from digital GND to minimize noise coupling. |
| D1–D2, E1–E2 | VIN | Main input power rail (2.5–5.5 V); connects to CIN with shortest possible path to minimize high di/dt loop area. |
| D3–D4, E3–E4 | SW | Switching node connecting to inductor; high dv/dt node requiring tight layout and guard ring to adjacent analog traces. |
Key Features
| Feature | Design Value |
|---|---|
| Digitally programmable output | 0.6–1.23 V in precise 10 mV steps via I²C; eliminates external resistor networks and enables real-time DVS during CPU DVFS. |
| Programmable slew rate | Eight selectable rates (0.5–64 mV/µs) via CONTROL register; prevents overshoot/undershoot during voltage transitions across process/voltage/temperature corners. |
| PFM/PWM auto-mode transition | Seamless switch at ~10 mA load; maintains >80% efficiency from 10 mA to 5 A without audible coil whine or output ripple spikes. |
| Internal soft-start | Ramped reference minimizes inrush current into large output caps; supports startup into pre-biased loads without reverse current. |
| Input UVLO & OVP protection | UVLO threshold 2.4 V ±50 mV with 350 mV hysteresis; OVP triggers at 6.15 V rising edge to protect internal MOSFETs from overvoltage stress. |
| Thermal shutdown | Activates at 150°C junction temperature with 17°C hysteresis; prevents permanent damage during sustained overload or poor PCB thermal design. |
Applications
| Smartphone Application Processor Core | Tablet GPU Voltage Rail |
|---|---|
Use Scenario: Powers ARM Cortex-A78/A710 cores in flagship smartphones requiring dynamic voltage scaling between 0.7 V (idle) and 1.2 V (peak performance). IC Role / Device Role / Timing Role: Primary core voltage regulator with I²C-controlled VOUT transitions synchronized to CPU frequency changes. Use Value: Enables sub-100 ns voltage slewing to match 100+ MHz DVFS timing, reducing energy waste during state transitions by up to 18% vs. fixed-output regulators. | Use Scenario: Supplies Mali-G710 GPU in Android tablets, handling burst loads up to 5 A during gaming or video rendering. IC Role / Device Role / Timing Role: High-current synchronous buck delivering stable 0.95 V with <±40 mV transient deviation under 0.1–1.5 A load steps. Use Value: Maintains >85% efficiency at 1.5 A load, reducing thermal dissipation by 1.2 W compared to legacy 1.5 MHz solutions using larger inductors. |
| Ultra-Mobile PC SoC I/O Domain | Embedded DSP Power Rail |
Use Scenario: Regulates I/O voltage (1.05 V default) for Intel Atom x6000E or Qualcomm Snapdragon 7c Gen 3 in clamshell netbooks. IC Role / Device Role / Timing Role: Secondary buck converter with EN-controlled sequencing, activated after main SoC core rail stabilizes. Use Value: 20-bump WLCSP footprint fits within 3 mm² board area, enabling dense routing beneath SoC BGA without via-in-pad constraints. | Use Scenario: Powers TI C66x or Analog Devices SHARC+ DSP in industrial vision systems requiring low-noise 1.1 V supply. IC Role / Device Role / Timing Role: Low-ripple, high-PSRR regulator with forced PWM mode enabled to suppress switching noise near analog signal paths. Use Value: Achieves –55 dB PSRR at 100 kHz and <10 mVpp ripple at 5 A, meeting ADC reference stability requirements for 16-bit precision imaging. |
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 |
|---|---|---|---|
| TPS628640RQYR | 4 A max output, 1.8–5.5 V input, I²C interface up to 1 Mbps, 1.22 mm × 1.62 mm DSBGA | Limited to 4 A; lacks PFM/PWM auto-transition; lower I²C speed restricts DVFS responsiveness | Choose when board space is tighter than 1.6×2.0 mm and 4 A suffices; verify thermal margin with 1.22 mm package. |
| RTQ2134BGQW | 5 A output, 2.7–5.5 V input, I²C up to 3.4 Mbps, 1.96 mm × 2.16 mm QFN | Larger QFN package increases layout area; no programmable slew rate; higher 120 µA quiescent current in light-load mode | Prefer for designs needing robust thermal pad soldering and less stringent size constraints; confirm layout compatibility with 0.4 mm pitch WLCSP vs. 0.5 mm QFN. |
Compared with TPS628640RQYR and RTQ2134BGQW, the FAN53555UC00X offers superior integration density (1.6×2.0 mm WLCSP), finer 10 mV output resolution, and configurable slew rate - making it optimal for space-constrained mobile SoC core rails where dynamic voltage agility and thermal efficiency are critical.
Availability
FAN53555UC00X is available at Aetrix Electronics and suitable for smartphone application processor core supplies, tablet GPU voltage rails, and ultra-mobile PC SoC I/O domains requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for FAN53555UC00X 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 FAN53555UC00X belongs to onsemi's TinyBuck® family of high-efficiency, digitally programmable DC-DC regulators designed specifically for core voltage regulation in battery-powered mobile and embedded processors.
FAQ
What is the default output voltage of the FAN53555UC00X at power-up?
The FAN53555UC00X powers up with a default output voltage of 1.05 V, as specified in Table 1 of the datasheet. This value corresponds to the VSEL0 register setting and is maintained until reprogrammed via I²C or toggled using the VSEL pin. The device retains register values during hardware shutdown (EN = LOW) unless configured as a reset-on-shutdown option like 04 or 24 - which does not apply to the FAN53555UC00X.
Does the FAN53555UC00X support forced PWM mode to eliminate frequency variation?
Yes, the FAN53555UC00X supports forced PWM mode via the MODE bit in the VSEL registers. When set HIGH, it disables PFM operation and locks the switching frequency at 2.4 MHz regardless of load current - essential for noise-sensitive applications like RF transceivers or high-speed ADCs. In this mode, quiescent current rises to 43 mA, but output ripple remains deterministic and EMI filtering becomes predictable.
What is the maximum pulse current capability of the FAN53555UC00X?
The FAN53555UC00X is rated for 5 A continuous output current, and its pulse current capability is not specified in the datasheet for the 00 option. Only the 05 variant (FAN53555UC05X) explicitly supports 6.5 A pulse current for 50 ms. Therefore, the FAN53555UC00X should be designed for sustained 5 A loads, with peak demands limited by thermal design and inductor saturation rating - not a guaranteed pulse spec.
Can the FAN53555UC00X start up into a pre-biased output capacitor?
Yes, the FAN53555UC00X supports startup into a pre-biased output capacitor. During soft-start, synchronous rectification is inhibited, allowing the high-side MOSFET to remain off while the low-side switch controls discharge - preventing reverse current flow. This behavior is confirmed in the Operation Description section and enables safe integration in multi-rail systems where other regulators may power auxiliary circuits before the FAN53555UC00X enables.
What external components are required for a typical FAN53555UC00X application?
A typical FAN53555UC00X application requires a 330 nH shielded power inductor (e.g., Vishay IHLP1616ABERR47M01), two 22 µF/6.3 V X5R 0805 output capacitors (44 µF total), one 10 µF/10 V X5R 0805 input capacitor, and one 10 nF/25 V X7R 0402 high-frequency bypass capacitor. These values are validated in Table 2 and Figure 1 of the datasheet for 5 A maximum load operation with optimal transient response and stability.
FAN53555UC00X 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)
FAN53555UC00X FAQ
1.How can I place an order for FAN53555UC00X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN53555UC00X 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 FAN53555UC00X reliable?
The price and inventory of FAN53555UC00X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN53555UC00X is usually 5 days.
3.What payment methods are accepted for FAN53555UC00X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN53555UC00X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN53555UC00X?
FAN53555UC00X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN53555UC00X 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 FAN53555UC00X?
For technical support, including FAN53555UC00X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN53555UC00X requirements.
6.How does Aetrix verify that FAN53555UC00X is sourced from the original manufacturer or authorized distributors?
All FAN53555UC00X 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 FAN53555UC00X meets industry standards.
7.What is the process for return or replacement of FAN53555UC00X?
All FAN53555UC00X units undergo pre-shipment inspection (PSI). If there is an issue with FAN53555UC00X, 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 FAN53555UC00X part is unused and in its original packaging.
Return procedure for FAN53555UC00X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
FAN53555UC00X Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
