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onsemi FAN53526UC64X
- Part No.:
- FAN53526UC64X
- Manufacturer:
- onsemi
- Package:
- 15-UFBGA, WLCSP
- Datasheet:
-
FAN53526UC64X.pdf
- Description:
- IC REG BUCK PROG 3A 15WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
FAN53526UC64X 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 FAN53526UC64X datasheet, pinout, applications, or equivalent options, key selection criteria include its 15-bump WLCSP package, 1.00 V power-up default output, I²C slave address 0xC0, thermal shutdown at 150 °C, and programmable slew rate for dynamic voltage scaling in ARM/Tegra/OMAP processors.
Technical Context
The FAN53526UC64X 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 supports seamless transition between continuous conduction mode (CCM) and discontinuous conduction mode (DCM) single-pulse PFM for high light-load efficiency.
Control is delivered via an I²C interface compliant with Standard, Fast, Fast Plus, and High-Speed (3.4 Mbps) modes. Voltage selection is dual-path: hardware-selectable via VSEL pin (choosing between VSEL0/VSEL1 registers) and software-programmable through 7-bit NSEL fields, with register-based slew rate control (0.5–64 mV/s) and forced PWM/autonomous PFM mode configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3.0 A continuous - supports full-core operation of application processors without derating. |
| Switching Frequency | 2.4 MHz nominal - enables use of compact 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, and intermediate bus rails. |
| Digital Output Range | 0.600 V to 1.39375 V in 6.25 mV steps - provides precise DVS for ARM/Tegra/Krait cores. |
| I²C Interface Speed | Up to 3.4 Mbps (High-Speed Mode) - enables rapid voltage transitions during DVFS events. |
| Quiescent Current | 50 µA typical in PFM mode - extends battery life in always-on subsystems. |
| Thermal Protection | 150 °C shutdown with 17 °C hysteresis - prevents permanent damage under sustained overload. |
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 | Power Input | 2.5–5.5 V supply input; connects directly to CIN with minimal loop area for EMI control. |
| VOUT | Regulated Output | Feedback-sense node; must connect to COUT bulk capacitor for stability and transient response. |
| SW | Switching Node | Connects to inductor; high dV/dt node requiring tight layout and isolation from analog traces. |
| PGND | Power Ground | Low-side MOSFET return; ties CIN/COUT ground planes with shortest possible path to minimize noise. |
| AGND | Analog Ground | Reference for I²C, VSEL, EN, and internal circuitry; must be isolated from PGND except at single-point star connection. |
| EN | Enable Control | Active-high logic input; internal 250 kΩ pull-down ensures safe shutdown at power-up. |
| VSEL | Voltage Select | Selects between VSEL0 (1.00 V default) and VSEL1 registers; internal pull-down enables default boot behavior. |
| SCL / SDA | I²C Interface | Open-drain bidirectional (SDA) and input-only (SCL); require external pull-ups to AGND-referenced rail. |
Key Features
| Feature | Design Value |
|---|---|
| Digitally Programmable Output | 0.600–1.39375 V in 6.25 mV steps via I²C or VSEL pin - enables precise core voltage tuning for process/voltage/temp corners. |
| PFM/PWM Auto-Transition | Seamless mode switching maintains >80% efficiency from 10 mA to 3.0 A - eliminates efficiency valleys common in hybrid controllers. |
| Programmable Slew Rate | Eight selectable rates (0.5–64 mV/s) - balances voltage transition speed against system-level noise and inrush current. |
| Integrated Protection | UVLO (2.45 V), OVP (6.2 V), thermal shutdown (150 °C), and peak current limit (4.75 A) - reduces need for external fault management circuitry. |
| Soft-Start & Output Discharge | 150 µs soft-start ramp + optional internal 11 Ω discharge path - prevents inrush surges and enables controlled power sequencing. |
Applications
| Mobile Application Processor Core Supply | LPDDR3/LPDDR4 Memory I/O Supply |
|---|---|
Use Scenario: Dynamic voltage and frequency scaling (DVFS) for ARM Cortex-A series, Tegra, OMAP, and Krait application processors in smartphones and tablets. IC Role / Device Role / Timing Role: Primary core voltage regulator with real-time I²C reprogramming of output during CPU state transitions. Use Value: Enables 1.00 V boot default (FAN53526UC64X) and fine-grained 6.25 mV DVS steps to minimize active power while maintaining timing margins. | Use Scenario: Stable, low-noise power delivery to LPDDR3/LPDDR4 memory interfaces requiring fast transient response and tight voltage tolerance. IC Role / Device Role / Timing Role: Dedicated memory I/O rail regulator with ±2.5% DC accuracy and ±50 mV load transient deviation at 1.5 A step. Use Value: Maintains signal integrity during burst read/write operations by delivering sub-50 mV transient deviation and <150 µs soft-start. |
| Ultra-Mobile PC SoC Power Management | Gaming Device GPU Core Supply |
Use Scenario: Multi-rail power solution for Intel Atom or Qualcomm Snapdragon SoCs in netbooks and 2-in-1 devices with aggressive thermal constraints. IC Role / Device Role / Timing Role: High-efficiency core rail regulator operating in PFM at idle and forced PWM under load, managed via platform firmware. Use Value: Delivers >80% efficiency down to 10 mA while maintaining 2.4 MHz switching for compact passive sizing - critical for fanless thermal design. | Use Scenario: Adaptive voltage scaling for mobile GPU cores (e.g., Adreno, Mali-T) during graphics-intensive gaming sessions. IC Role / Device Role / Timing Role: Fast-transient capable buck converter programmed via I²C to track GPU workload demands in real time. Use Value: Achieves ±16 mV transient deviation at 500 mA step with 100 ns edge, preventing GPU throttling 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 |
|---|---|---|---|
| TPS62864DRLR | 3.0 A, 2.5 V–5.5 V input, I²C-programmable 0.3–1.5375 V output (6.25 mV steps), 2.2 MHz switching, 20-pin WQFN. | Requires external compensation; larger footprint than WLCSP; higher quiescent current (75 µA vs. 50 µA). | Preferred when board space allows larger package and design requires TI ecosystem integration. |
| RTQ2132BWGE | 3.0 A, 2.5 V–5.5 V input, I²C-programmable 0.5–1.5375 V (6.25 mV), 2.2 MHz, 16-pin WLCSP (1.49 × 1.99 mm). | Same WLCSP form factor but different ball layout; no VSEL pin; uses different I²C address (0x60). | Considered for pin-compatible redesign where VSEL hardware select is not required and RTQ2132B's 1.2 V default aligns with system needs. |
Compared with TPS62864DRLR and RTQ2132BWGE, the FAN53526UC64X offers identical 3.0 A capability and 6.25 mV programming resolution but uniquely combines 1.00 V power-up default, VSEL hardware select, and 2.4 MHz operation in a 1.31 × 2.015 mm WLCSP - optimizing for minimal footprint and deterministic boot voltage in space-constrained mobile SoC designs.
Availability
FAN53526UC64X is available at Aetrix Electronics and suitable for mobile processor core supplies, LPDDR memory rails, and ultra-mobile PC power management requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for FAN53526UC64X 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 FAN53526 belongs to onsemi's TinyBuck family of ultra-compact, digitally programmable DC-DC regulators designed specifically for dynamic voltage scaling in mobile and portable SoC platforms.
FAQ
What is the default output voltage of the FAN53526UC64X at power-up?
The FAN53526UC64X powers up with a default output voltage of 1.00 V, determined by its factory-programmed VSEL0 register value. This setting is active when the VSEL pin is held low at startup and remains the initial regulated output until modified via I²C command or VSEL pin toggle. The 1.00 V default is specified in Table 1 of the datasheet and aligns with common core voltage requirements for ARM and Tegra processors.
Does the FAN53526UC64X support I²C High-Speed Mode, and what is its maximum clock frequency?
Yes, the FAN53526UC64X supports I²C High-Speed Mode with a maximum clock frequency of 3.4 Mbps, as confirmed in Table 9 and the Operating Description section. This capability enables rapid voltage reconfiguration during DVFS events. The interface also supports Standard (100 kHz), Fast (400 kHz), and Fast Plus (1 MHz) modes, ensuring compatibility across diverse host controller implementations without requiring protocol translation.
How does the FAN53526UC64X manage efficiency across light and heavy loads?
The FAN53526UC64X maintains high efficiency across the full load range by automatically switching between Pulse Frequency Modulation (PFM) at light loads (<100 mA) and fixed-frequency PWM at heavier loads. In PFM mode, it achieves a typical quiescent current of 50 µA, preserving battery life. At 3.0 A, it sustains >80% efficiency using synchronous rectification and a 2.4 MHz switching frequency - eliminating the efficiency "valley" typical of non-hybrid architectures.
What protection features are integrated into the FAN53526UC64X?
The FAN53526UC64X integrates input under-voltage lockout (UVLO, 2.45 V), input over-voltage protection (OVP, ~6.2 V), thermal shutdown (150 °C with 17 °C hysteresis), and peak current limiting (4.75 A). These functions operate autonomously without host intervention. The Monitor register (Reg 05) provides real-time status flags (PGOOD, UVLO, OVP, POS, NEG) accessible via I²C, enabling firmware-level fault detection and recovery for the FAN53526UC64X.
Can the FAN53526UC64X be used without I²C communication?
Yes, the FAN53526UC64X can operate without I²C communication by relying solely on the VSEL pin to select between two pre-programmed output voltages (VSEL0 = 1.00 V, VSEL1 = configurable). The EN pin provides hardware enable/disable control, and all protection features remain fully functional. This mode simplifies integration in systems lacking I²C resources while retaining robust regulation - making the FAN53526UC64X viable for both programmable and fixed-output applications.
FAN53526UC64X 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)
FAN53526UC64X FAQ
1.How can I place an order for FAN53526UC64X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN53526UC64X 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 FAN53526UC64X reliable?
The price and inventory of FAN53526UC64X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN53526UC64X is usually 5 days.
3.What payment methods are accepted for FAN53526UC64X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN53526UC64X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN53526UC64X?
FAN53526UC64X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN53526UC64X 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 FAN53526UC64X?
For technical support, including FAN53526UC64X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN53526UC64X requirements.
6.How does Aetrix verify that FAN53526UC64X is sourced from the original manufacturer or authorized distributors?
All FAN53526UC64X 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 FAN53526UC64X meets industry standards.
7.What is the process for return or replacement of FAN53526UC64X?
All FAN53526UC64X units undergo pre-shipment inspection (PSI). If there is an issue with FAN53526UC64X, 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 FAN53526UC64X part is unused and in its original packaging.
Return procedure for FAN53526UC64X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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