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onsemi FAN53526UC84X
- Part No.:
- FAN53526UC84X
- Manufacturer:
- onsemi
- Package:
- 15-UFBGA, WLCSP
- Datasheet:
-
FAN53526UC84X.pdf
- Description:
- IC REG BUCK PROG 3A 15WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:2,940
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Product details
Overview
FAN53526UC84X from onsemi is a digitally programmable 3.0 A synchronous step-down DC-DC regulator with I²C interface, 2.4 MHz fixed switching frequency, 0.600 V to 1.39375 V output voltage range in 6.25 mV steps, and input voltage support from 2.5 V to 5.5 V. It delivers high efficiency (>80%) across 10 mA–3.0 A load range and is used for core voltage regulation in mobile application processors.
For engineers reviewing the FAN53526UC84X datasheet, pinout, applications, or equivalent options, key selection criteria include its 15-bump WLCSP package, programmable slew rate (0.5–64 mV/s), PFM/PWM auto-mode transition behavior, and thermal shutdown at 150 °C with 17 °C hysteresis.
Technical Context
The FAN53526UC84X 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 transition between continuous conduction mode (CCM) and discontinuous conduction mode (DCM) single-pulse PFM at light loads.
Control is delivered via an I²C interface compliant with Standard, Fast, Fast Plus, and High-Speed (3.4 Mbps) modes using slave address 0xC0. Voltage selection is dual-path: hardware-selectable via VSEL pin (choosing between VSEL0/VSEL1 registers) and software-programmable through 7-bit NSEL fields, with power-up default output set to 1.125 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3.0 A continuous - supports full-core operation of ARM/Tegra/OMAP processors without derating. |
| Switching Frequency | 2.4 MHz nominal - enables use of compact 330 nH inductors and reduces EMI filtering burden. |
| Input Voltage Range | 2.5 V to 5.5 V - compatible with single-cell Li-ion, USB PD, and intermediate bus rails. |
| Output Voltage Range | 0.600 V to 1.39375 V in 6.25 mV steps - provides precise core voltage tuning for dynamic voltage scaling (DVS). |
| I²C Interface Speed | Up to 3.4 Mbps (High-Speed Mode) - enables rapid voltage reconfiguration during processor state transitions. |
| Quiescent Current | 50 µA typical in PFM mode - extends battery life in always-on subsystems. |
| Thermal Shutdown | 150 °C activation with 17 °C hysteresis - prevents permanent damage during sustained overload or poor PCB thermal design. |
Pinout & Package
Package: 15-bump Wafer-Level Chip Scale Package (WLCSP), 1.310 mm × 2.015 mm, 0.4 mm ball pitch, case 567QS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (A1, B1, C1) | Power Input | Supplies 2.5–5.5 V input; requires low-inductance connection to CIN and PGND. |
| SW (A2, B2) | Switching Node | Connects directly to inductor; carries high dI/dt; must be routed with minimal loop area. |
| VOUT (E3) | Regulated Output | Sense and power output node; connects to COUT and load; critical for feedback stability. |
| PGND (A3, B3, C2) | Power Ground | Reference for low-side MOSFET; return path for high-current inductor and output capacitor. |
| AGND (C3, E1) | Analog Ground | Reference for control circuitry and I²C interface; must be isolated from noisy PGND paths. |
| EN (D2) | Enable Input | Active-high logic control; internal 250 kΩ pull-down ensures safe shutdown at power-up. |
| VSEL (D1) | Voltage Select | Selects between VSEL0 (1.125 V default) and VSEL1 registers; internal 250 kΩ pull-down. |
| SCL (E2) | I²C Clock | Input-only clock line; must be pulled up externally if used; supports up to 3.4 MHz. |
| SDA (D3) | I²C Data | Open-drain bidirectional data line; requires external pull-up; supports ACK/NACK signaling. |
Key Features
| Feature | Design Value |
|---|---|
| Digitally Programmable DVS | 7-bit NSEL register + VSEL pin selection enables real-time core voltage adjustment for performance/power trade-offs. |
| Programmable Slew Rate | Eight discrete settings (0.5–64 mV/s) prevent overshoot/undershoot during voltage transitions under varying load conditions. |
| Auto PFM/PWM Mode | Seamless transition between high-efficiency PFM (light load) and stable-frequency PWM (heavy load) without external intervention. |
| Output Discharge Control | Software-enabled internal 11 Ω discharge path (via OUTPUT_DISCHARGE bit) safely collapses VOUT during shutdown. |
| Robust Protection Suite | Integrated UVLO (2.45 V threshold), OVP (6.15 V shutdown), peak current limit (4.75 A typ), and thermal shutdown (150 °C). |
Applications
| Mobile Application Processor Core Supply | LPDDR3/LPDDR4 Memory I/O Supply |
|---|---|
Use Scenario: Powers CPU/GPU cores in smartphones and tablets requiring dynamic voltage scaling across performance states. IC Role / Device Role / Timing Role: Primary buck regulator delivering digitally reprogrammable output voltage synchronized to processor DVFS commands via I²C. Use Value: Enables >80% efficiency from 10 mA to 3.0 A, reducing thermal load and extending battery runtime during mixed-use workloads. | Use Scenario: Supplies I/O voltage (1.2 V or 1.1 V) to LPDDR3/LPDDR4 memory subsystems in ultra-thin portable devices. IC Role / Device Role / Timing Role: Secondary regulated rail generator with fast transient response (<±50 mV deviation for 0.01–1.5 A step) to maintain memory signal integrity. Use Value: Maintains tight DC accuracy (±2.5%) and low output ripple under burst read/write loads, preventing memory timing violations. |
| Ultra-Mobile PC SoC Power Management | Gaming Device Application Processor Rail |
Use Scenario: Provides core voltage to ARMADA or Krait-based SoCs in netbooks and 2-in-1 convertibles with constrained board space. IC Role / Device Role / Timing Role: Compact WLCSP regulator supporting high-density layout; integrates soft-start, enable control, and I²C telemetry in one die. Use Value: 1.31 mm × 2.02 mm footprint minimizes PCB area while delivering 3.0 A with <150 µs startup time to 95% VOUT. | Use Scenario: Delivers adaptive core voltage to gaming SoCs during rapid GPU/CPU load changes in handheld consoles. IC Role / Device Role / Timing Role: High-bandwidth power stage with programmable slew rate and best-in-class load transient response. Use Value: ±16 mV transient deviation at 100 ns edge (0–500 mA) ensures stable clock domain operation during frame-rendering bursts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS628641RQYR | 2.5–5.5 V input, 3 A, 2.25 MHz, I²C interface, but fixed 0.3–1.5375 V range with 12.5 mV steps; no VSEL pin. | Lacks hardware-selectable dual-voltage registers; requires full software control for all voltage changes. | Choose when I²C-only configuration suffices and board layout prioritizes TI ecosystem compatibility. |
| RTQ2134BGQW | 2.5–5.5 V input, 3 A, 2.2 MHz, I²C interface, 0.5–1.52 V range in 6.25 mV steps; includes PMBus v1.3 support. | Supports PMBus READ_VOUT/READ_IOUT telemetry; higher quiescent current (75 µA vs. 50 µA) in light-load mode. | Prefer when real-time current monitoring and standardized PMBus command set are required for system-level power management. |
Compared with TPS628641RQYR and RTQ2134BGQW, the FAN53526UC84X uniquely combines dual-register hardware/software voltage selection (VSEL0/VSEL1), lowest PFM quiescent current (50 µA), and best-in-class transient response-making it optimal for battery-sensitive mobile SoC designs demanding both flexibility and efficiency.
Availability
FAN53526UC84X is available at Aetrix Electronics and suitable for smartphone power management, LPDDR memory supply, and ultra-mobile PC SoC applications requiring stable component supply and long-term lifecycle support.
Supply support for FAN53526UC84X 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 FAN53526UC84X belongs to onsemi's TinyBuck family of highly integrated, digitally programmable DC-DC regulators designed specifically for space-constrained, battery-powered mobile processors requiring dynamic voltage scaling and ultra-low quiescent current.
FAQ
What is the default output voltage of the FAN53526UC84X at power-up?
The FAN53526UC84X powers up with a default output voltage of 1.125 V, as specified in Table 1 of the datasheet for part number FAN53526UC84X. This value corresponds to the VSEL0 register setting and is active when the VSEL pin is held low. The device retains register contents during hardware shutdown (EN = LOW), allowing consistent boot behavior across power cycles.
Does the FAN53526UC84X support I²C High-Speed Mode, and what is its slave address?
Yes, the FAN53526UC84X supports I²C High-Speed Mode up to 3.4 Mbps. Its default 7-bit slave address is 0xC0 (1100000b), with the R/W bit appended to form an 8-bit address. This address is fixed for FAN53526UC84X per Table 12; other variants like FAN53526UC168X use 0xC2. No address configuration pins or registers are provided - the address is hardwired.
How does the FAN53526UC84X handle output voltage transitions, and can the slew rate be controlled?
The FAN53526UC84X supports programmable positive-going voltage transition slew rates via the SLEW bits (bits 6–4) in the CONTROL register (0x02). Eight discrete settings are available from 0.5 mV/s to 64 mV/s. Negative transitions rely on load discharge; the IC halts switching until VOUT reaches the new setpoint. This control prevents overshoot and ensures clean state transitions during DVFS.
What protection features are integrated into the FAN53526UC84X?
The FAN53526UC84X integrates input under-voltage lockout (UVLO, 2.45 V threshold), input over-voltage protection (OVP, 6.15 V shutdown), thermal shutdown (150 °C with 17 °C hysteresis), and peak current limiting (4.75 A typical). It also includes output discharge capability via the OUTPUT_DISCHARGE bit and soft-start current limiting to prevent inrush during startup.
Is the FAN53526UC84X pin-compatible with other variants in the FAN53526 family?
Yes, all FAN53526 variants-including FAN53526UC84X, FAN53526UC89X, and FAN53526UC100X-share identical 15-bump WLCSP packaging, pinout, and mechanical footprint (case 567QS). Differences are limited to factory-programmed default voltages (VSEL0/VSEL1) and I²C slave addresses; no PCB redesign is needed when substituting within the family for voltage or addressing adjustments.
FAN53526UC84X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- TinyBuck®
- Package/Case:
- 15-UFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- 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):
- 1.125V
- Voltage - Output (Max):
- 1.125V
- 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)
FAN53526UC84X FAQ
1.How can I place an order for FAN53526UC84X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN53526UC84X 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 FAN53526UC84X reliable?
The price and inventory of FAN53526UC84X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN53526UC84X is usually 5 days.
3.What payment methods are accepted for FAN53526UC84X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN53526UC84X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN53526UC84X?
FAN53526UC84X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN53526UC84X 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 FAN53526UC84X?
For technical support, including FAN53526UC84X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN53526UC84X requirements.
6.How does Aetrix verify that FAN53526UC84X is sourced from the original manufacturer or authorized distributors?
All FAN53526UC84X 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 FAN53526UC84X meets industry standards.
7.What is the process for return or replacement of FAN53526UC84X?
All FAN53526UC84X units undergo pre-shipment inspection (PSI). If there is an issue with FAN53526UC84X, 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 FAN53526UC84X part is unused and in its original packaging.
Return procedure for FAN53526UC84X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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