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onsemi FAN53526UC88X
- Part No.:
- FAN53526UC88X
- Manufacturer:
- onsemi
- Package:
- 15-UFBGA, WLCSP
- Datasheet:
-
FAN53526UC88X.pdf
- Description:
- IC REG BUCK PROG 3A 15WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
FAN53526UC88X from onsemi is a digitally programmable 3.0 A synchronous step-down DC-DC regulator with I²C interface, operating at 2.4 MHz fixed frequency and supporting 0.600 V to 1.39375 V output in 6.25 mV steps across 2.5 V–5.5 V input. It delivers >80% efficiency from 10 mA to 3.0 A load and integrates PFM/PWM auto-mode switching for mobile SoC core voltage regulation.
For engineers reviewing the FAN53526UC88X datasheet, pinout, applications, or equivalent options, key selection criteria include its 15-bump WLCSP package, 1.15 V power-up default, C0 I²C slave address, ±50 mV load transient response at 1.15625 V, and programmable slew rate for dynamic voltage scaling in ARM/Tegra/OMAP processors.
Technical Context
The FAN53526UC88X implements a proprietary non-linear fixed-frequency PWM modulator with synchronous rectification, enabling stable 2.4 MHz operation independent of input voltage and load current. Its architecture eliminates ESR dependency, allowing full use of low-ESR ceramic capacitors while maintaining fast transient response.
Control logic combines hardware (EN, VSEL) and software (I²C register writes) enablement, with dual VSEL registers (VSEL0/VSEL1), MODE bits for PFM/PWM selection, and OUTPUT_DISCHARGE bit for active output discharge. The device supports High-Speed I²C up to 3.4 Mbps and features integrated UVLO (2.45 V threshold), thermal shutdown (150 °C), and overvoltage protection (6.2 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3.0 A continuous - supports high-current SoC cores without external current sharing |
| Switching Frequency | 2.4 MHz nominal - enables compact 330 nH inductor and small ceramic output capacitors |
| Input Voltage Range | 2.5 V to 5.5 V - compatible with single-cell Li-ion, USB, and intermediate rail supplies |
| Digital Output Range | 0.600 V–1.39375 V in 6.25 mV steps - precise DVS for ARM/Krait/Tegra processor DVFS |
| I²C Interface Speed | Up to 3.4 Mbps (High-Speed Mode) - enables rapid voltage updates during workload transitions |
| Quiescent Current | 50 µA typical in PFM mode - extends battery life in always-on subsystems |
| Load Transient Response | ±50 mV at 0.01 A → 1.5 A step - maintains stable core voltage during CPU burst activity |
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 | Connects directly to input source; minimal trace length required to reduce noise and voltage drop |
| VOUT (E3) | Regulated Output | Sense node for feedback loop; must connect directly to output capacitor anode |
| SW (A2, B2) | Switching Node | Drives external inductor; high dV/dt node requiring tight layout and ground shielding |
| PGND (A3, B3, C2) | Power Ground | Reference for low-side MOSFET; return path for high-current inductor and input/output caps |
| AGND (C3, E1) | Analog Ground | Reference for control circuitry and I²C interface; isolated from PGND to prevent noise coupling |
| EN (D2) | Enable Input | Active-high digital control; internal 250 kΩ pull-down ensures safe shutdown at power-up |
| VSEL (D1) | Voltage Select | Selects between VSEL0/VSEL1 register sets; determines default output and PFM/PWM mode |
| SCL (E2) | I²C Clock | Input-only clock line; requires external pull-up to AGND or VIN for proper bus timing |
| SDA (D3) | I²C Data | Open-drain bidirectional data line; requires external pull-up and supports 3.4 Mbps HS mode |
Key Features
| Feature | Design Value |
|---|---|
| Digitally Programmable Output | 7-bit DAC resolution (128 steps) enables precise 6.25 mV granularity for adaptive core voltage scaling |
| Auto PFM/PWM Transition | Seamless mode switching maintains >80% efficiency from 10 mA to 3.0 A without audible switching noise |
| Programmable Slew Rate | 8 selectable rates (0.5–64 mV/s) prevent overshoot/undershoot during dynamic voltage transitions |
| Integrated Protection | UVLO (2.45 V), OVP (6.2 V), thermal shutdown (150 °C), and peak current limit (4.75 A) ensure robust system-level reliability |
| Soft-Start Control | Internal ramp limits inrush current; 150 µs to 95% VOUT prevents input rail collapse during startup |
Applications
| Mobile Application Processor Core Supply | LPDDR3/LPDDR4 Memory Rail |
|---|---|
Use Scenario: Powering ARM Cortex-A series, Tegra, OMAP, or Krait CPU cores in smartphones and tablets during dynamic workloads. IC Role / Device Role / Timing Role: Primary core voltage regulator with real-time I²C-controlled DVS to match CPU frequency scaling. Use Value: Enables energy-efficient operation by reducing VDD during low utilization while maintaining ±2.5% DC accuracy and ±50 mV transient response. | Use Scenario: Delivering tightly regulated supply to LPDDR3/LPDDR4 memory interfaces in ultra-thin mobile devices. IC Role / Device Role / Timing Role: Low-noise, fast-transient buck converter synchronized to memory controller timing requirements. Use Value: Supports memory bandwidth up to 3200 MT/s with <100 ns load step response and <10 mV ripple at 1.15625 V output. |
| Ultra-Mobile PC SoC Platform | Gaming Device Application Processor |
Use Scenario: Providing configurable core voltage to Intel Atom or ARMADA SoCs in netbooks and 2-in-1 devices. IC Role / Device Role / Timing Role: Digitally programmable PMIC rail with hardware/software enable and output discharge capability. Use Value: Allows firmware-controlled voltage sequencing and safe power-down via OUTPUT_DISCHARGE bit in CONTROL register. | Use Scenario: Regulating GPU and CPU cores in handheld gaming consoles with burst-intensive graphics workloads. IC Role / Device Role / Timing Role: High-efficiency, high-bandwidth power stage supporting rapid voltage transitions during frame rendering. Use Value: Maintains stable 1.15 V core rail under 0–3 A load swings with <120 ns edge response and no stability compromise from ceramic capacitor selection. |
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, 2.4 MHz, I²C-programmable (0.3–1.5375 V), but uses 12-pin 1.6 mm × 2.1 mm QFN vs. WLCSP | Requires PCB redesign due to different footprint and thermal pad layout; lacks VSEL pin hardware select | Preferred when board space allows larger package and QFN thermal performance is prioritized |
| RTQ2134BGQW | 2.7–5.5 V input, 3 A, 2.2 MHz, I²C-programmable (0.5–1.5375 V), 16-bump WLCSP (1.42 mm × 2.02 mm), C0 address | Nearly identical form factor and pin compatibility; slightly lower max frequency and wider input range | Drop-in alternative if 2.2 MHz switching suffices and same WLCSP layout can be reused |
Compared with TPS628641RQYR and RTQ2134BGQW, the FAN53526UC88X offers tighter output voltage granularity (6.25 mV vs. 12.5 mV), faster I²C speed (3.4 Mbps vs. 1 Mbps), and integrated VSEL hardware selection-making it optimal for legacy ARM-based platforms requiring precise DVS timing and minimal layout change.
Availability
FAN53526UC88X is available at Aetrix Electronics and suitable for mobile SoC core supplies, LPDDR memory rails, and ultra-mobile PC platform designs requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for FAN53526UC88X 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 leader delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The FAN53526UC88X belongs to onsemi's TinyBuck family of digitally programmable DC-DC regulators, designed specifically for high-efficiency, space-constrained core voltage regulation in mobile and portable computing platforms.
FAQ
What is the default output voltage of the FAN53526UC88X at power-up?
The FAN53526UC88X powers up with a default output voltage of 1.15 V, as specified in the ordering information table for this variant. This value corresponds to the VSEL1 register setting and is maintained until modified via I²C write or VSEL pin state change. The device retains register contents during EN-low shutdown, ensuring consistent restart behavior.
Does the FAN53526UC88X support forced PWM mode, and how is it enabled?
Yes, the FAN53526UC88X supports forced PWM mode. It is enabled by setting the MODE bits in the CONTROL register (address 02h) to '10' and configuring the VSEL pin HIGH, or by setting MODE to '01' with VSEL LOW. This disables PFM operation, locking the regulator to fixed 2.4 MHz switching regardless of load current - useful for noise-sensitive applications where frequency stability is critical.
What I²C slave address does the FAN53526UC88X use, and is it configurable?
The FAN53526UC88X uses I²C slave address 0xC0 (7-bit address 0x60), as confirmed in Table 12 of the datasheet. This address is fixed for the UC88X variant and not user-configurable. Other variants like UC168X use 0xC2, but FAN53526UC88X exclusively responds to 0xC0, simplifying multi-device bus design without address conflict concerns.
How does the FAN53526UC88X handle output capacitor discharge during shutdown?
The FAN53526UC88X discharges the output capacitor only when the OUTPUT_DISCHARGE bit (bit 7) in the CONTROL register (02h) is set to 1 AND the EN pin is LOW or BUCK_ENx is disabled. When activated, an internal 11 Ω pull-down connects VOUT to GND. This feature is disabled by default and must be explicitly programmed - ensuring safe, controlled discharge without unintended power loss during normal operation.
What is the maximum recommended output capacitance for reliable startup of the FAN53526UC88X?
The maximum recommended output capacitance for reliable startup of the FAN53526UC88X is governed by equation (1): COUTMAX ≈ 320 × VOUT / ILOAD, where COUTMAX is in µF, VOUT in volts, and ILOAD in amperes. For example, with 1.15 V output and 1 A soft-start load, COUTMAX ≈ 368 µF. Exceeding this may cause startup failure due to excessive inrush current limiting.
FAN53526UC88X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- TinyBuck®
- Package/Case:
- 15-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):
- 1.394V
- 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)
FAN53526UC88X FAQ
1.How can I place an order for FAN53526UC88X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN53526UC88X 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 FAN53526UC88X reliable?
The price and inventory of FAN53526UC88X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN53526UC88X is usually 5 days.
3.What payment methods are accepted for FAN53526UC88X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN53526UC88X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN53526UC88X?
FAN53526UC88X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN53526UC88X 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 FAN53526UC88X?
For technical support, including FAN53526UC88X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN53526UC88X requirements.
6.How does Aetrix verify that FAN53526UC88X is sourced from the original manufacturer or authorized distributors?
All FAN53526UC88X 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 FAN53526UC88X meets industry standards.
7.What is the process for return or replacement of FAN53526UC88X?
All FAN53526UC88X units undergo pre-shipment inspection (PSI). If there is an issue with FAN53526UC88X, 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 FAN53526UC88X part is unused and in its original packaging.
Return procedure for FAN53526UC88X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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