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onsemi FAN53528GUC48X
- Part No.:
- FAN53528GUC48X
- Manufacturer:
- onsemi
- Package:
- 15-UFBGA, WLCSP
- Datasheet:
-
FAN53528GUC48X.pdf
- Description:
- IC REG BUCK PROG 3A 15WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:3,348
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Product details
Overview
FAN53528GUC48X from onsemi is a digitally programmable 3.0 A synchronous buck regulator with I²C interface, fixed 2.4 MHz switching frequency, and 0.35 V–1.14375 V output voltage range in 6.25 mV steps. It delivers >80% efficiency from 10 mA to 3.0 A load, supports PFM/PWM auto-mode transition, and targets core voltage regulation for mobile application processors including ARM, Tegra, and OMAP.
For engineers reviewing the FAN53528GUC48X datasheet, pinout, applications, or equivalent options, key selection criteria include its WLCSP-15 package footprint, 2.4 MHz constant-frequency operation enabling compact 330 nH inductor use, I²C-compatible interface up to 3.4 Mbps, and dual-VSEL register architecture enabling hardware-selectable output voltage presets (0.65 V / 0.70 V).
Technical Context
The FAN53528GUC48X employs a proprietary non-linear fixed-frequency PWM modulator with synchronous rectification, maintaining stable 2.4 MHz operation across input voltages (2.5–5.5 V) and load currents (0–3.0 A). Its architecture eliminates ESR dependency, enabling full compatibility with low-ESR ceramic output capacitors.
It integrates dual programmable VSEL registers (VSEL0/VSEL1), slew-rate control (0.5–64 mV/s), and hardware/software enable logic. The device enters Discontinuous Conduction Mode (DCM) single-pulse PFM at light loads (<10 mA), achieving 50 µA typical quiescent current while preserving fast transient response (±13 mV load step from 0→800 mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3.0 A continuous - supports high-current SoC core rails without external current sharing |
| Switching Frequency | 2.4 MHz nominal - enables use of 330 nH inductors and reduces external component size |
| Input Voltage Range | 2.5 V to 5.5 V - compatible with single-cell Li-ion, USB PD, and intermediate bus supplies |
| Output Voltage Range | 0.35 V to 1.14375 V in 6.25 mV steps - meets precise core voltage requirements for modern mobile processors |
| I²C Interface Speed | Up to 3.4 Mbps (High-Speed Mode) - enables rapid dynamic voltage scaling during CPU DVFS transitions |
| Quiescent Current | 50 µA typical in PFM mode - minimizes battery drain during system idle states |
| Thermal Shutdown | 150 °C with 17 °C hysteresis - protects die under sustained overload or poor PCB thermal design |
| Package | 15-bump WLCSP, 1.310 mm × 2.015 mm, 0.4 mm pitch - ultra-compact footprint for space-constrained mobile PCBs |
Pinout & Package
Package: 15-bump Wafer-Level Chip Scale Package (WLCSP), Case 567QS, 1.310 mm × 2.015 mm, 0.4 mm ball pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D1 - VSEL | Voltage select control | Selects between VSEL0 (0.65 V default) and VSEL1 (0.70 V default) output registers; internal 250 kΩ pull-down |
| D2 - EN | Hardware enable | Active-high shutdown control; retains register state when LOW; no EN delay for FAN53528GUC48X |
| E2 - SCL | I²C clock input | Accepts standard/fast/fast-plus/high-speed I²C clocks up to 3.4 MHz |
| D3 - SDA | I²C bidirectional data | Open-drain interface supporting ACK/NACK and repeated START for read/write sequences |
| E3 - VOUT | Output voltage sense | Direct connection point for output capacitor; used for feedback and regulation monitoring |
| A3/B3/C2 - PGND | Power ground return | Low-side MOSFET reference; requires minimal impedance path to CIN/COUT ground planes |
| C3/E1 - AGND | Analog ground reference | Reference for internal analog circuits; must be isolated from high di/dt PGND paths |
| A1/B1/C1 - VIN | Main power input | Supplies internal circuitry and high-side switch; connect CIN with shortest possible trace |
| A2/B2 - SW | Switching node | Connects to inductor; carries high-frequency AC current; critical for EMI and efficiency |
Key Features
| Feature | Design Value |
|---|---|
| Dual VSEL register architecture | Enables hardware-selectable output voltage presets (0.65 V / 0.70 V) without I²C transaction overhead |
| Programmable positive slew rate | Eight selectable rates (0.5–64 mV/s) prevent overshoot during dynamic voltage scaling transitions |
| PFM/PWM auto-mode transition | Maintains >80% efficiency from 10 mA to 3.0 A while delivering ±13 mV load transient response |
| Integrated protection suite | Includes UVLO (2.45 V threshold), OVP (6.15 V shutdown), thermal shutdown (150 °C), and peak current limit (4.75 A) |
| Output discharge control | Optional internal 11 Ω pull-down activated via OUTPUT_DISCHARGE bit to safely discharge VOUT during disable |
| ESR-independent regulation | Eliminates need for aluminum/polymer bulk capacitors; fully compatible with X5R/X7R ceramics only |
Applications
| Mobile Application Processor Core Rail | LPDDR3/LPDDR4 Memory I/O Supply |
|---|---|
Use Scenario: Powering ARM Cortex-A series or Qualcomm Krait CPU cores requiring dynamically scaled voltage between 0.6 V and 0.9 V. IC Role / Device Role / Timing Role: Primary core voltage regulator with I²C-controlled DVFS, synchronized to processor performance states. Use Value: Enables real-time voltage adjustment matching CPU frequency changes, reducing active power by up to 35% versus fixed-output regulators. |
Use Scenario: Delivering tightly regulated 1.2 V or 1.1 V supply to LPDDR3/LPDDR4 memory interfaces in smartphones and tablets. IC Role / Device Role / Timing Role: High-bandwidth, low-noise point-of-load regulator with fast load transient response for burst-mode memory access. Use Value: Maintains ±13 mV regulation during 0→800 mA load steps, preventing memory timing violations and data corruption. |
| Ultra-Mobile PC SoC Platform | Gaming Handheld GPU Core Supply |
Use Scenario: Providing 0.7–0.85 V core voltage to Intel Atom or Marvell ARMADA SoCs in fanless ultra-mobile PCs. IC Role / Device Role / Timing Role: Compact, thermally efficient buck converter operating in forced PWM mode to eliminate audible switching noise. Use Value: 2.4 MHz fixed frequency avoids interference with audio codecs and RF front-ends; WLCSP-15 footprint saves >12 mm² vs. QFN alternatives. |
Use Scenario: Supplying scalable GPU core voltage (0.65–0.95 V) in portable gaming devices with thermal constraints. IC Role / Device Role / Timing Role: Digitally programmable regulator supporting GPU boost clocks and thermal throttling via I²C commands. Use Value: Dual VSEL register support allows hardware-triggered voltage jumps during frame rendering spikes, improving FPS consistency. |
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 |
|---|---|---|---|
| TPS62864DRLR | 2.5–5.5 V input, 3 A, 1.8–4.0 MHz adjustable frequency, 0.4–1.95 V output, 12-pin WSON | Larger 2.0 mm × 2.0 mm package; lacks dual-hardware-VSEL; supports higher max output voltage | Choose for designs needing >1.14 V output or adjustable switching frequency; avoid if board space is constrained below 1.31×2.02 mm |
| RTQ2132BGQW | 2.5–5.5 V input, 3 A, 2.2 MHz fixed frequency, 0.5–1.52 V output, 16-pin QFN | 4× larger QFN-16 footprint; includes PMBus interface instead of I²C; no VSEL pin | Prefer for industrial systems requiring PMBus telemetry; not suitable for mobile PCBs where WLCSP area savings are critical |
Compared with TPS62864DRLR and RTQ2132BGQW, the FAN53528GUC48X offers the smallest footprint (1.31×2.02 mm), hardware-selectable dual output presets, and I²C speed optimized for mobile DVFS latency - making it uniquely suited for space- and responsiveness-critical smartphone/tablet SoC power delivery.
Availability
FAN53528GUC48X is available at Aetrix Electronics and suitable for mobile application processors, LPDDR memory supplies, and ultra-mobile PC platforms requiring stable component supply, consistent WLCSP-15 sourcing, and long-term lifecycle support.
Supply support for FAN53528GUC48X 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 FAN53528GUC48X belongs to onsemi's high-efficiency, digitally programmable DC-DC converter product line, engineered specifically for dynamic voltage scaling in mobile and ultra-mobile computing platforms.
FAQ
What is the default output voltage of the FAN53528GUC48X at power-on?
The FAN53528GUC48X defaults to 0.65 V when the VSEL pin is pulled LOW (VSEL0 register) and 0.70 V when VSEL is HIGH (VSEL1 register), per its ordering option GUC48X marking. These values are pre-programmed into the VSEL0 and VSEL1 registers and persist after power-on reset unless overwritten via I²C. The actual output depends on the external VSEL pin state at startup.
Does the FAN53528GUC48X support forced PWM mode, and how is it enabled?
Yes, the FAN53528GUC48X supports forced PWM mode. It is enabled by setting the MODE bits [1:0] = '10' in Control Register 02h and asserting the VSEL pin HIGH. This configuration overrides automatic PFM/PWM transition, ensuring fixed 2.4 MHz operation regardless of load current - critical for noise-sensitive applications like audio or RF subsystems.
What is the maximum recommended output capacitance for reliable startup of the FAN53528GUC48X?
The FAN53528GUC48X has a maximum recommended output capacitance of approximately COUTMAX = (ILIMPK − ILOAD) × 320 / VOUT μF for reliable startup into heavy constant-current loads, where ILIMPK = 4.75 A (typical peak current limit) and ILOAD is the soft-start load current. Exceeding this value may cause startup failure due to insufficient inrush current capability during the soft-start ramp.
How does the FAN53528GUC48X handle high-to-low voltage transitions?
During high-to-low voltage transitions, the FAN53528GUC48X stops switching and relies on the output load to discharge VOUT to the new setpoint. The NEG bit in Monitor Register 05 asserts to indicate the transition is in progress. No slew rate control applies to falling edges - discharge rate is determined solely by load resistance and output capacitance.
Is the FAN53528GUC48X pin-compatible with other variants in the FAN53528 family?
No, all FAN53528 variants - including FAN53528GUC48X, FAN53528DUC40X, and FAN53528BUC08X - share identical WLCSP-15 pinout and package dimensions. They differ only in factory-programmed VSEL0/VSEL1 default voltages and EN delay configuration, making them functionally interchangeable at the PCB layout level without redesign.
FAN53528GUC48X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 15-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):
- 0.35V
- Voltage - Output (Max):
- 1.14V
- Current - Output:
- 3A
- Frequency - Switching:
- 2.4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 15-WLCSP (2.02x1.31)
FAN53528GUC48X FAQ
1.How can I place an order for FAN53528GUC48X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN53528GUC48X 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 FAN53528GUC48X reliable?
The price and inventory of FAN53528GUC48X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN53528GUC48X is usually 5 days.
3.What payment methods are accepted for FAN53528GUC48X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN53528GUC48X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN53528GUC48X?
FAN53528GUC48X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN53528GUC48X 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 FAN53528GUC48X?
For technical support, including FAN53528GUC48X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN53528GUC48X requirements.
6.How does Aetrix verify that FAN53528GUC48X is sourced from the original manufacturer or authorized distributors?
All FAN53528GUC48X 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 FAN53528GUC48X meets industry standards.
7.What is the process for return or replacement of FAN53528GUC48X?
All FAN53528GUC48X units undergo pre-shipment inspection (PSI). If there is an issue with FAN53528GUC48X, 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 FAN53528GUC48X part is unused and in its original packaging.
Return procedure for FAN53528GUC48X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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