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onsemi FAN53200UC35X
- Part No.:
- FAN53200UC35X
- Manufacturer:
- onsemi
- Package:
- 20-UFBGA, WLCSP
- Datasheet:
-
FAN53200UC35X.pdf
- Description:
- IC REG BUCK PROG 5A 20WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
FAN53200UC35X from onsemi is a digitally programmable synchronous step-down DC-DC regulator delivering up to 5 A output current with I²C interface control, fixed 2.4 MHz switching frequency, and 0.6–1.3875 V programmable output in 12.5 mV steps - deployed for core voltage regulation in ARM/Krait/OMAP application processors.
For engineers reviewing the FAN53200UC35X datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, WLCSP-20 terminal mapping, PFM/PWM mode behavior, thermal resistance (θJA = 38 °C/W), and validated alternatives for mobile SoC power delivery designs.
Technical Context
The FAN53200UC35X uses a proprietary non-linear fixed-frequency PWM modulator with synchronous rectification, enabling fast load transient response while maintaining constant 2.4 MHz operation across input voltages (2.5–5.5 V) and loads (10 mA–5 A). Its architecture supports Discontinuous Conduction Mode (DCM) single-pulse PFM at light loads and seamless transition to Continuous Conduction Mode (CCM) PWM at higher currents.
It integrates an I²C-compatible interface (up to 3.4 Mbps) with slave address 0xC0, supporting dynamic voltage scaling via VSEL0/VSEL1 registers, programmable slew rate (0.625–80 mV/µs), output discharge control, and hardware/software enable coordination through EN, VSEL, and BUCK_EN bits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 5 A continuous - sufficient for high-performance mobile CPU/GPU core rails without external current sharing. |
| Switching Frequency | 2.4 MHz nominal - enables use of compact 330 nH inductors and reduces EMI fundamental frequency. |
| I²C Interface Speed | Up to 3.4 Mbps - supports Fast Plus Mode for rapid dynamic voltage scaling during processor DVFS transitions. |
| Output Voltage Range | 0.6 V to 1.3875 V in 12.5 mV steps - matches ARM/Krait/OMAP core voltage requirements with ±1.5% DC accuracy. |
| Quiescent Current | 60 µA typical in PFM mode - extends battery life in idle/sleep states of smartphones and tablets. |
| Input Voltage Range | 2.5 V to 5.5 V - compatible with single-cell Li-ion (3.0–4.2 V) and USB-powered systems. |
| Efficiency | 87–88% at 1.15 V/100–2000 mA - maintains >80% efficiency from 10 mA to full load via adaptive PFM/PWM mode switching. |
| Thermal Resistance | θJA = 38 °C/W - requires minimum 2-oz copper PCB layout with thermal vias under WLCSP-20 die for 125 °C max junction operation. |
Pinout & Package
Package: 20-bump Wafer-Level Chip Scale Package (WLCSP), 1.6 mm × 2.0 mm × 0.586 mm (Case 567SH), bottom-side solder bumps with exposed thermal pad connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 (VSEL) | Voltage select logic input | Selects between VSEL0 (LOW) or VSEL1 (HIGH) register-defined output voltage; defaults to VSEL0 = 1.15 V at power-up for FAN53200UC35X. |
| A2 (EN) | Hardware enable input | Active-HIGH enable; pulls all registers to default values and disables switching when LOW; draws only 0.1 µA in shutdown. |
| A3 (SCL) | I²C clock input | Accepts standard/fast/fast-plus/HS-mode clocks up to 3.4 MHz; requires external pull-up to VDD. |
| A4 (VOUT) | Output voltage sense node | Direct connection point for feedback loop; must be routed with minimal impedance to COUT near load for remote sensing accuracy. |
| B1 (SDA) | I²C bidirectional data line | Open-drain output; requires external pull-up; supports ACK/NACK signaling and register read/write per I²C protocol. |
| B2–B3, C1–C4 (GND) | Power ground reference | Low-side MOSFET source reference; CIN/COUT must return here with shortest possible path to minimize ground bounce. |
| B4 (AGND) | Analog ground reference | Reference for internal error amplifier and ADC; must be isolated from noisy digital/power ground paths to avoid regulation noise. |
| D1–D2, E1–E2 (VIN) | Main input power supply | 2.5–5.5 V input rail; connects directly to CIN with minimal trace inductance to suppress ringing during switching transitions. |
| D3–D4, E3–E4 (SW) | Switching node | Connects to inductor; carries high di/dt square wave; must be routed short and wide to reduce EMI and voltage overshoot. |
Key Features
| Feature | Design Value |
|---|---|
| Digitally programmable output | 0.6–1.3875 V in 12.5 mV steps via I²C - enables precise core voltage tuning for process/voltage/temperature corners. |
| Adaptive PFM/PWM mode switching | Auto-transition between 60 µA-quiescent PFM (light load) and fixed 2.4 MHz PWM (heavy load) - balances efficiency and ripple across full load range. |
| Programmable slew rate | Eight selectable rates (0.625–80 mV/µs) for voltage ramp transitions - prevents system-level instability during DVFS events. |
| Integrated protection | Input UVLO (2.4 V threshold), OVP (6.2 V shutdown), thermal shutdown (150 °C), and cycle-by-cycle current limiting (7.4 A peak) - ensures robust operation under fault conditions. |
| Internal soft-start | 340 µs EN-to-95% VOUT rise time (1.15 V target) - eliminates inrush current and output overshoot into pre-charged loads. |
| Remote sensing support | VOUT pin routed to load-side capacitor - compensates for IR drop in PCB traces, maintaining ±1.5% regulation at point-of-load. |
Applications
| Smartphone Application Processor Core Rail | Tablet SoC Dynamic Voltage Scaling |
|---|---|
|
Use Scenario: Regulating core voltage for Qualcomm Krait or ARM Cortex-A series CPUs during burst workloads and sleep states. IC Role / Device Role / Timing Role: Primary buck converter delivering dynamically scaled VCORE with I²C-controlled voltage transitions synchronized to CPU frequency changes. Use Value: Enables sub-100 µA quiescent current in PFM mode and <±20 mV load transient deviation - critical for battery runtime and system stability. |
Use Scenario: Powering OMAP or ARMADA application processors in ultra-mobile PCs requiring multi-voltage domain sequencing. IC Role / Device Role / Timing Role: Digitally programmable core regulator with hardware EN and VSEL pin control for boot-time voltage selection and runtime reconfiguration. Use Value: Supports 12.5 mV fine-grained voltage steps and programmable slew rate - avoids overvoltage stress during DVFS transitions in multi-core SoCs. |
| Gaming Device GPU Power Rail | Hard Disk Drive Motor Controller Supply |
|
Use Scenario: Providing stable 1.1–1.2 V supply to mobile GPU cores during intensive rendering tasks with rapid load changes. IC Role / Device Role / Timing Role: High-current (5 A), high-efficiency synchronous buck delivering low-noise power with best-in-class load transient response (±20 mV). Use Value: Maintains >87% efficiency at 2 A and <3 mV ripple in PWM mode - minimizes thermal dissipation and prevents GPU throttling. |
Use Scenario: Generating regulated 1.15 V supply for HDD motor controller ICs requiring tight line/load regulation and fast transient recovery. IC Role / Device Role / Timing Role: Precision buck regulator with ±0.5 mV/V line regulation and ±0.2 mV/A load regulation - compensates for varying battery input and motor startup surges. Use Value: Delivers 5 A peak current with integrated current limiting and thermal shutdown - protects motor driver circuitry during stall conditions. |
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 |
|---|---|---|---|
| TPS628641RQYR | 3 A output, 2.5 MHz switching, I²C interface, 0.4–1.95 V output range, 16-pin QFN | Lower current rating; wider output range; larger package footprint | Choose for space-constrained designs needing broader voltage flexibility but lower current demand. |
| RTQ2132BGQW | 4 A output, 2.2 MHz switching, I²C interface, 0.5–1.5375 V in 6.25 mV steps, 20-pin WLCSP | Finer 6.25 mV resolution; slightly lower max current; same WLCSP-20 footprint | Prefer when sub-12.5 mV voltage granularity is required and 4 A suffices for target SoC core rail. |
Compared with FAN53200UC35X, TPS628641RQYR offers higher voltage flexibility but reduced current capability and larger QFN packaging, while RTQ2132BGQW provides finer voltage resolution in identical WLCSP-20 form factor but trades 1 A of output current for precision - making FAN53200UC35X optimal for 5 A mobile core rails demanding proven thermal performance and I²C-based DVFS.
Availability
FAN53200UC35X is available at Aetrix Electronics and suitable for smartphone application processor core rails, tablet SoC dynamic voltage scaling, gaming device GPU power rails, and hard disk drive motor controller supplies requiring stable component supply, long-term lifecycle support, and automotive-grade reliability validation.
Supply support for FAN53200UC35X 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 (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and mobile markets.
The FAN53200UC35X belongs to onsemi's TinyBuck family of high-efficiency, digitally programmable DC-DC regulators designed specifically for core voltage regulation in advanced mobile SoCs including ARM, Krait, OMAP, NovaThor, and ARMADA platforms.
FAQ
What is the default output voltage of the FAN53200UC35X at power-up?
The FAN53200UC35X powers up with VSEL pin LOW and BUCK_EN0 = 0, selecting VSEL0 register value of 1.15 V as the default output voltage. This is confirmed by the Ordering Information table and Register Map (VSEL0 NSEL0 = 101000 → 0.6 V + 46 × 12.5 mV = 1.15 V). The FAN53200UC35X does not require I²C initialization to deliver functional output voltage.
Does the FAN53200UC35X support remote sensing, and how is it implemented?
Yes, the FAN53200UC35X supports remote sensing via its dedicated VOUT pin, which must be routed directly to the positive terminal of the output capacitor located at the load (e.g., CPU power pad). This configuration compensates for IR drop across PCB traces, ensuring ±1.5% DC regulation accuracy at point-of-load. Layout guidance specifies trace resistance ≤30 mΩ between FAN53200UC35X and CPU.
How does the FAN53200UC35X handle load transients, and what is its measured performance?
The FAN53200UC35X achieves ±20 mV load transient deviation for 0.1 A ↔ 1.2 A steps with 100 ns rise/fall times, as verified in Table 6 and Figure 11. This performance results from its proprietary non-linear PWM modulator and synchronous rectification architecture, which maintains constant 2.4 MHz switching during transients and eliminates dependency on output capacitor ESR - enabling use of low-ESR ceramic capacitors.
Can the FAN53200UC35X operate without I²C communication, and what functionality remains available?
Yes, the FAN53200UC35X operates fully without I²C: hardware pins EN and VSEL set basic functionality - EN enables/disables regulation, and VSEL selects between two pre-programmed voltages (VSEL0 = 1.15 V, VSEL1 = 1.15 V for FAN53200UC35X). All protections (UVLO, OVP, thermal shutdown, current limiting), PFM/PWM auto-mode switching, and soft-start remain active without I²C interaction.
What is the maximum recommended inductance value for the FAN53200UC35X, and why is it limited?
The FAN53200UC35X supports inductors up to 1.0 µH (1000 nH), though 330 nH is recommended for optimal transient response and efficiency. Higher inductance degrades load transient response due to increased L·di/dt delay and reduces maximum deliverable average current (per IMAX(LOAD) = ILIM(PK) − ΔI/2). Stability is maintained up to 1.0 µH only when using ≥30 µF total COUT.
FAN53200UC35X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- TinyBuck®
- Package/Case:
- 20-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):
- 1.39V
- Current - Output:
- 5A
- Frequency - Switching:
- 2.4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-WLCSP (1.96x1.56)
FAN53200UC35X FAQ
1.How can I place an order for FAN53200UC35X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN53200UC35X 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 FAN53200UC35X reliable?
The price and inventory of FAN53200UC35X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN53200UC35X is usually 5 days.
3.What payment methods are accepted for FAN53200UC35X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN53200UC35X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN53200UC35X?
FAN53200UC35X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN53200UC35X 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 FAN53200UC35X?
For technical support, including FAN53200UC35X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN53200UC35X requirements.
6.How does Aetrix verify that FAN53200UC35X is sourced from the original manufacturer or authorized distributors?
All FAN53200UC35X 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 FAN53200UC35X meets industry standards.
7.What is the process for return or replacement of FAN53200UC35X?
All FAN53200UC35X units undergo pre-shipment inspection (PSI). If there is an issue with FAN53200UC35X, 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 FAN53200UC35X part is unused and in its original packaging.
Return procedure for FAN53200UC35X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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