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onsemi FAN53527UC84X
- Part No.:
- FAN53527UC84X
- Manufacturer:
- onsemi
- Package:
- 15-UFBGA, WLCSP
- Datasheet:
-
FAN53527UC84X.pdf
- Description:
- IC REG BUCK PROG 3A 15WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
FAN53527UC84X from onsemi is a 3.0 A synchronous buck regulator with I²C programmability and pin-selectable operation, supporting 2.5 V–5.5 V input and delivering 1.125 V (default) or 1.081 V output in a 15-bump WLCSP package. It achieves >80% efficiency across 10 mA–3.0 A load range, operates at 2.4 MHz fixed PWM frequency, and features Auto PFM mode for light-load efficiency-ideal for powering LPDDR4/5 memory and application processors in space-constrained mobile devices.
For engineers reviewing the FAN53527UC84X datasheet, pinout, applications, or equivalent options, this page provides verified technical context, validated pin functions, confirmed I²C timing compliance (up to 1 Mbps Fast Mode Plus), exact output voltage selection logic (VSEL0/VSEL1), and real-world transient response data (±15 mV for 1 mA→500 mA step in Forced PWM).
Technical Context
The FAN53527UC84X implements a proprietary non-linear fixed-frequency PWM modulator with synchronous rectification, maintaining 2.4 MHz switching across input voltages (2.5–5.5 V) and load currents (0–3.0 A). Its architecture decouples regulation performance from output capacitor ESR, enabling stable operation with low-ESR ceramic capacitors.
It supports dual control paths: hardware pin configuration (EN, VSEL, MODE) for standalone use and full I²C interface (7-bit slave address 0x60) for dynamic reprogramming of output voltage (1.000–1.39375 V in 6.25 mV steps), slew rate (0.5–64 mV/s), and operating mode (Auto PFM/Forced PWM). Internal protection includes UVLO (2.45 V threshold), thermal shutdown (150°C), and overcurrent limiting (4.75 A typical peak).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3.0 A continuous - supports high-current SoC cores and memory rails without external current sharing. |
| Switching Frequency | 2.4 MHz nominal - enables compact 470 nH inductors and reduces EMI filtering requirements. |
| Input Voltage Range | 2.5 V to 5.5 V - compatible with single-cell Li-ion (3.0–4.2 V), USB PD (5 V), and wide-input PMIC outputs. |
| Quiescent Current | 48 µA in Auto PFM - extends battery life in always-on subsystems (e.g., modem standby, sensor hubs). |
| Output Voltage Accuracy | ±2.5% (Auto PFM), ±1.5% (Forced PWM) - ensures reliable core voltage margining for LPDDR4/5 and application processors. |
| Load Transient Response | ±15 mV for 1 mA→500 mA step (Forced PWM) - maintains stable supply during CPU burst activity without external compensation. |
| I²C Interface Speed | Up to 1 Mbps (Fast Mode Plus) - enables fast DVS transitions during DVFS sequences in mobile SoCs. |
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, A2, B2) | Power Input | Main input supply node; requires local 4.7 µF decoupling (CIN) placed adjacent to minimize loop inductance. |
| SW (A3, B3) | Switching Node | Connects directly to inductor (L1); high dv/dt node requiring tight layout and minimal copper area to reduce EMI. |
| PGND (C3) | Power Ground | Low-side MOSFET return path; must be connected to CIN/COUT ground planes with low-inductance vias. |
| AGND (C2) | Analog Ground | Reference for control circuitry; isolated from PGND except at single-point star ground to avoid noise coupling. |
| VOUT (E3) | Output Feedback | Connects to positive terminal of output capacitors (COUT1/COUT2); used for regulation sensing and PGOOD monitoring. |
| VSEL (D1) | Voltage Select Control | Digital input selecting between VSEL0 (1.125 V) or VSEL1 (1.081 V) defaults; LOW = VSEL0, HIGH = VSEL1. |
| MODE (C2) | Operation Mode Control | Digital input selecting Auto PFM (LOW) or Forced PWM (HIGH); overrides I²C MODE bits when asserted. |
| EN (D2) | Enable Input | Active-HIGH enable; pulls internal regulators and gate drivers; supports hardware power sequencing with <1 µA shutdown current. |
| SCL (E2) | I²C Clock Input | Open-drain compatible clock line; requires external pull-up; routing away from noisy traces prevents timing violations. |
| SDA (D3) | I²C Data I/O | Bi-directional open-drain data line; must not float; supports standard/fast/fast-plus I²C protocols up to 1 Mbps. |
Key Features
| Feature | Design Value |
|---|---|
| I²C Programmability | 7-bit slave address 0x60; supports dynamic VOUT reprogramming (1.000–1.39375 V, 6.25 mV steps), slew rate (8 options), and mode control without hardware changes. |
| Auto PFM / Forced PWM Dual Mode | Seamless transition between high-efficiency PFM (for light loads) and stable PWM (for heavy loads); no audible noise or output voltage discontinuity. |
| Best-in-Class Load Transient Response | ±15 mV deviation for 1 mA→500 mA step in Forced PWM mode - eliminates need for large bulk capacitance in portable designs. |
| Integrated Protection Suite | UVLO (2.45 V), thermal shutdown (150°C, 17°C hysteresis), overvoltage protection (6.15 V), and cycle-by-cycle current limiting (4.75 A typical). |
| Pin-Selectable Default Outputs | VSEL0 = 1.125 V and VSEL1 = 1.081 V - enables board-level configuration for different SoC voltage domains without firmware update. |
Applications
| LPDDR4/5 Memory Power | Application Processor Core Rail |
|---|---|
|
Use Scenario: Powers DDR4/5 I/O and core rails in smartphones and tablets where tight voltage tolerance and fast load transients are required. IC Role / Device Role / Timing Role: Primary point-of-load (POL) regulator delivering regulated 1.081 V or 1.125 V with <±2.5% accuracy and sub-20 mV transient deviation. Use Value: Enables reliable high-speed memory operation up to 6400 MT/s while minimizing board area via 2.4 MHz switching and small 470 nH inductor. |
Use Scenario: Supplies core voltage to application processors (e.g., Qualcomm Snapdragon, MediaTek Dimensity) during DVFS transitions. IC Role / Device Role / Timing Role: Dynamically reprogrammable buck converter controlled via I²C to track processor voltage scaling requests in real time. Use Value: Achieves <75 µs soft-start and programmable slew rates (0.5–64 mV/s) to meet processor voltage ramp specifications without external circuitry. |
| Gaming Handheld SoC Power | Ultra-Mobile PC Platform Rail |
|
Use Scenario: Delivers high-current, low-noise power to GPU and CPU clusters in handheld gaming devices with aggressive thermal constraints. IC Role / Device Role / Timing Role: High-efficiency (≥85% at 2 A) synchronous buck with thermal shutdown and current limiting for sustained burst workloads. Use Value: Maintains >80% efficiency from 10 mA to 3.0 A, reducing heat generation and extending battery runtime during gameplay sessions. |
Use Scenario: Provides stable 1.125 V rail for Intel Atom or ARM-based ultra-mobile PCs requiring long battery life and compact form factor. IC Role / Device Role / Timing Role: Standalone-configurable regulator using EN/VSEL/MODE pins for simplified power sequencing without host processor involvement. Use Value: 48 µA quiescent current in Auto PFM mode extends standby time; WLCSP package saves >40% PCB area vs. QFN alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS628641RQYR | 3.0 A, 2.5–5.5 V input, 1.0–1.375 V output; 4-MHz switching; integrated inductor; no I²C interface. | Lacks programmable slew rate and real-time voltage reconfiguration; suited for fixed-voltage, space-constrained apps where inductor integration is prioritized. | Select when board area is critical and voltage is static; avoid when DVFS or fine-grained DVS is required. |
| RTQ2132BGQW | 3.0 A, 2.5–5.5 V input, 0.6–1.8 V output; 2.2-MHz switching; I²C-compatible; 1.2% output accuracy; no pin-selectable defaults. | Higher output accuracy and wider VOUT range but lacks hardware VSEL/MODE pins for standalone operation. | Prefer when tighter regulation (±1.2%) is mandatory and I²C control is always available; not suitable for pin-strapped fallback configurations. |
Compared with TPS628641RQYR and RTQ2132BGQW, the FAN53527UC84X uniquely combines pin-selectable default voltages, I²C programmability, and best-in-class transient response-making it optimal for mobile SoC power where both flexibility and performance are required.
Availability
FAN53527UC84X is available at Aetrix Electronics and suitable for LPDDR5 memory power, application processor core rails, and ultra-mobile PC platform designs requiring stable component supply, consistent WLCSP packaging, and guaranteed long-term availability for consumer electronics production.
Supply support for FAN53527UC84X 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 focused on energy-efficient innovation, delivering silicon solutions for automotive, industrial, cloud, and mobile markets with emphasis on reliability and sustainability.
The FAN53527UC84X belongs to onsemi's high-efficiency DC-DC converter product line, engineered specifically for mobile and portable applications demanding ultra-small footprint, dynamic voltage scaling, and robust light-load efficiency.
FAQ
What is the default output voltage of the FAN53527UC84X?
The FAN53527UC84X powers up with VSEL0 = 1.125 V as its default output voltage when the VSEL pin is held LOW. This value is factory-programmed and matches the marking "LQ" on the device. If VSEL is driven HIGH at startup, the output defaults to VSEL1 = 1.081 V. Both values are stored in registers 0x00 and 0x01 respectively and can be overwritten via I²C at any time.
Does the FAN53527UC84X support I²C communication at 1 Mbps?
Yes, the FAN53527UC84X supports Fast Mode Plus I²C operation up to 1 Mbps (1000 kHz), as specified in Table 9 of the datasheet. Its SCL and SDA pins meet timing requirements for tLOW = 0.5 µs, tHIGH = 0.26 µs, and tSU;DAT = 50 ns under Fast Mode Plus conditions, enabling rapid DVS transitions during processor DVFS events.
How does the FAN53527UC84X handle thermal overload?
The FAN53527UC84X activates thermal shutdown at a nominal junction temperature of 150°C, with 17°C hysteresis. When triggered, switching halts until die temperature falls below ~133°C, after which automatic restart occurs. This behavior is confirmed in Table 8 (TLIMIT = 150°C) and Operating Description section, ensuring safe operation under sustained 3.0 A loads in compact WLCSP layouts.
Can the FAN53527UC84X operate without an I²C controller?
Yes, the FAN53527UC84X supports full standalone operation using EN, VSEL, and MODE pins. With EN = HIGH, VSEL = LOW, and MODE = LOW, it delivers 1.125 V in Auto PFM mode-no I²C bus or firmware required. This pin-strapped functionality is validated in Table 10 (Hardware and Software Enable) and enables simple, robust power delivery in cost-sensitive or resource-limited designs.
What is the maximum recommended output capacitance for reliable startup of the FAN53527UC84X?
The FAN53527UC84X specifies a maximum output capacitance of approximately COUTMAX = 320 × VOUT / ILMPK for reliable startup into heavy constant-current loads, per Equation 1 in the datasheet. For VOUT = 1.125 V and ILMPK = 4.75 A, COUTMAX ≈ 76 µF. Exceeding this may cause soft-start failure due to excessive inrush current, as confirmed in the Enable and Soft-Start section.
FAN53527UC84X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- 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):
- 1.39V
- Voltage - Output (Max):
- 5.5V
- 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)
FAN53527UC84X FAQ
1.How can I place an order for FAN53527UC84X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN53527UC84X 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 FAN53527UC84X reliable?
The price and inventory of FAN53527UC84X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN53527UC84X is usually 5 days.
3.What payment methods are accepted for FAN53527UC84X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN53527UC84X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN53527UC84X?
FAN53527UC84X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN53527UC84X 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 FAN53527UC84X?
For technical support, including FAN53527UC84X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN53527UC84X requirements.
6.How does Aetrix verify that FAN53527UC84X is sourced from the original manufacturer or authorized distributors?
All FAN53527UC84X 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 FAN53527UC84X meets industry standards.
7.What is the process for return or replacement of FAN53527UC84X?
All FAN53527UC84X units undergo pre-shipment inspection (PSI). If there is an issue with FAN53527UC84X, 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 FAN53527UC84X part is unused and in its original packaging.
Return procedure for FAN53527UC84X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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