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onsemi FAN53200UC44X
- Part No.:
- FAN53200UC44X
- Manufacturer:
- onsemi
- Package:
- 20-UFBGA, WLCSP
- Datasheet:
-
FAN53200UC44X.pdf
- Description:
- IC REG BUCK PROG 5A 20WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:2,995
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Product details
Overview
FAN53200UC44X from onsemi is a digitally programmable synchronous step-down DC-DC regulator delivering 5 A continuous output at 1.15 V (VSEL1 default) or 0.85 V (VSEL0 default), operating from 2.5–5.5 V input with I²C interface up to 3.4 Mbps and fixed 2.4 MHz switching frequency for compact external component sizing. It targets core voltage regulation in mobile application processors.
For engineers reviewing the FAN53200UC44X datasheet, pinout, applications, or equivalent options, this page delivers verified technical context, real-world load transient performance (±20 mV), PFM/PWM mode behavior, thermal shutdown at 150°C, and WLCSP-20 package layout guidance - all confirmed from onsemi's official Rev. 5 datasheet (April 2025).
Technical Context
The FAN53200UC44X uses 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 auto-transition between PFM (60 µA quiescent current) and PWM (2.4 MHz) modes based on load current.
Output voltage is set via dual register banks (VSEL0/VSEL1) accessible through I²C or hardware-selectable by the VSEL pin; slew rate for rising transitions is programmable across eight values (0.625–80 mV/µs). Input UVLO triggers at 2.4 V with 350 mV hysteresis, and OVP shuts down switching above 6.15 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 5 A continuous - supports high-performance ARM/Krait/OMAP processor cores without derating at +85°C ambient. |
| Switching Frequency | 2.4 MHz nominal - enables use of ultra-small 330 nH inductors and reduces EMI fundamental frequency. |
| I²C Interface Speed | Up to 3.4 Mbps - compatible with Fast Plus Mode, allowing rapid dynamic voltage scaling during CPU DVFS transitions. |
| Quiescent Current | 60 µA typical in PFM mode - extends battery life in always-on subsystems like modem or sensor hubs. |
| Voltage Accuracy | ±3.0% over full load and input range - meets tight core rail tolerance requirements for 28 nm and finer process nodes. |
| Load Transient Response | ±20 mV for 0.1 A ↔ 1.2 A step - maintains stable core supply during sudden CPU activity bursts. |
| Thermal Shutdown | 150°C with 17°C hysteresis - protects die under sustained overload or poor PCB thermal design. |
Pinout & Package
Package: 20-bump Wafer-Level Chip Scale Package (WLCSP), 1.6 mm × 2.0 mm × 0.586 mm (Case 567SH), bottom-soldered bump array requiring controlled reflow profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 (VSEL) | Voltage select control | Hardware-selects between VSEL0 (0.85 V) and VSEL1 (1.15 V) output defaults; logic HIGH = VSEL1 active. |
| A2 (EN) | Enable input | Active-HIGH enable; drives IC into 0.1 µA shutdown when LOW; resets all registers to power-up defaults. |
| A3 (SCL) | I²C clock input | Accepts up to 3.4 Mbps clock; requires external pull-up; synchronizes all register read/write operations. |
| A4 (VOUT) | Output voltage sense | Direct connection point for feedback loop; must be routed with minimal impedance to COUT near load. |
| B1 (SDA) | I²C bidirectional data | Open-drain output; requires external pull-up; carries register address/data during I²C transactions. |
| B2–C4 (GND) | Power ground | Low-side MOSFET reference; return path for CIN/COUT; must be low-inductance polygon pour under IC. |
| B4 (AGND) | Analog ground | Reference for internal analog circuits; isolated from noisy digital/power GND paths to minimize noise coupling. |
| D1–E2 (VIN) | Input power supply | 2.5–5.5 V input; connects to CIN with shortest possible trace; multiple pins reduce IR drop and thermal stress. |
| D3–E4 (SW) | Switching node | Connects to inductor; carries high di/dt square wave; requires tight loop area with CIN and GND to limit EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-register voltage programming | VSEL0 (0.85 V) and VSEL1 (1.15 V) defaults stored in non-volatile registers; selectable via I²C or VSEL pin for boot-time flexibility. |
| Programmable slew rate | Eight-step rising-edge slew control (0.625–80 mV/µs) prevents overshoot during dynamic voltage scaling in multi-core SoCs. |
| Auto PFM/PWM transition | Seamless mode switching at ~10 mA load threshold; maintains >80% efficiency from 10 mA to 5 A without audible switching noise. |
| Internal soft-start | 340 µs ramp time to 95% of target VOUT; prevents inrush current and output overshoot during power-up into pre-charged loads. |
| Output discharge on disable | Configurable via OUTPUT_DISCHARGE bit; pulls VOUT to GND through internal 160 Ω resistor when EN or BUCK_ENx is deasserted. |
Applications
| Mobile Application Processor Core Rail | Ultra-Mobile PC SoC Power Delivery |
|---|---|
Use Scenario: Regulating core voltage for ARM Cortex-A series CPUs during DVFS transitions in smartphones. IC Role / Device Role / Timing Role: Primary buck regulator providing dynamically scaled VDD_CORE with I²C-controlled voltage steps and slew-limited transitions. Use Value: Enables precise 12.5 mV granularity voltage tuning and ±20 mV load transient stability - critical for meeting ARM big.LITTLE cluster timing margins. |
Use Scenario: Powering Krait or OMAP-based tablets with aggressive battery life targets. IC Role / Device Role / Timing Role: High-efficiency 5 A step-down converter operating in PFM at light load (<10 mA) and PWM at peak load. Use Value: Delivers >87% efficiency at 100 mA and >88% at 2 A - directly extending runtime in always-on display and background sync modes. |
| Gaming Handheld GPU Voltage Rail | Hard Disk Drive Motor Controller Supply |
Use Scenario: Supplying programmable voltage to integrated GPU cores in portable gaming devices during burst rendering. IC Role / Device Role / Timing Role: Digitally reconfigurable power stage supporting real-time GPU frequency/voltage coordination via I²C. Use Value: Achieves 2.4 MHz fixed-frequency operation to avoid interference with audio/video clock domains while maintaining <1% output ripple in PWM mode. |
Use Scenario: Providing stable 1.15 V bias to HDD motor driver ICs during spin-up and seek operations. IC Role / Device Role / Timing Role: High-current, low-noise DC-DC source with robust line/load regulation (±0.5 mV/V line, 0.2 mV/A load). Use Value: Maintains ±20 mV line transient response during VIN dips from 3.0 V to 3.6 V - preventing motor controller lockup during mechanical load surges. |
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 |
|---|---|---|---|
| TPS62864DRLR | 3 A max output, 1.8–5.5 V input, 4-MHz switching, I²C interface with 10-bit VOUT resolution (6.25 mV steps). | Lower current rating; better resolution but no hardware VSEL pin; optimized for smaller footprint rather than highest current density. | Choose for space-constrained designs needing finer voltage granularity and lower quiescent current (12 µA), not for 5 A peak loads. |
| RTQ2132BGQW | 5 A output, 2.5–5.5 V input, 2.2 MHz switching, I²C interface, but no PFM mode - fixed-frequency only. | Lacks light-load efficiency optimization; higher 120 µA quiescent current; no slew rate control or VSEL pin. | Choose when deterministic EMI profile is mandatory and battery life is secondary to transient consistency. |
Compared with TPS62864DRLR and RTQ2132BGQW, the FAN53200UC44X uniquely combines 5 A capability, dual-hardware/software voltage selection, programmable slew rate, and sub-100 µA PFM quiescent current - making it optimal for high-performance mobile SoC core rails where both peak current and standby efficiency are critical.
Availability
FAN53200UC44X is available at Aetrix Electronics and suitable for smartphone baseband power delivery, tablet SoC core regulation, and gaming handheld GPU voltage scaling requiring stable component supply, consistent WLCSP-20 packaging, and guaranteed long-term production continuity.
Supply support for FAN53200UC44X 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, sensors, and connectivity solutions for automotive, industrial, and consumer markets.
The FAN53200UC44X belongs to onsemi's TinyBuck family of high-density, digitally programmable DC-DC regulators designed specifically for core voltage regulation in advanced mobile application processors and SoCs.
FAQ
What is the default output voltage of the FAN53200UC44X at power-up?
The FAN53200UC44X powers up with VSEL1 register active by default, delivering 1.15 V output. This is determined by the NSEL1 bits (010100) in register 0x01 per the datasheet Table 12. The VSEL pin state does not override this default at POR - it only selects between VSEL0 and VSEL1 during normal operation. The FAN53200UC44X maintains this 1.15 V setting until reprogrammed via I²C or changed by toggling VSEL.
Does the FAN53200UC44X support remote sensing for improved load regulation?
Yes, the FAN53200UC44X supports remote sensing: the VOUT pin is intended for direct connection to the load's "+" side of the output capacitor, as shown in Figure 23 of the datasheet. Layout guidance (Figure 24) specifies that the FB trace resistance between FAN53200UC44X and CPU must not exceed 30 mΩ, and recommends placing additional small-value capacitors near the load to suppress high-frequency ripple - confirming true remote-sense capability for precision core rail regulation.
Can the FAN53200UC44X operate with an input voltage above 5.5 V?
No - the FAN53200UC44X has an absolute maximum VIN rating of 6.5 V during switching and 7.0 V when idle, but its recommended operating range is strictly 2.5 V to 5.5 V per Table 3. Input over-voltage protection triggers at 6.15 V (rising) and disables switching to prevent damage. Operating above 5.5 V violates the specified conditions for electrical characteristics including efficiency, regulation accuracy, and thermal performance - the FAN53200UC44X is not rated for sustained operation beyond 5.5 V.
How does the FAN53200UC44X handle output short-circuit conditions?
The FAN53200UC44X employs cycle-by-cycle peak current limiting with a typical ILIMPK of 7.4 A. If sixteen consecutive current-limit cycles occur, the device enters thermal shutdown and remains off for ~1700 µs before attempting soft-start again. It also features built-in thermal shutdown at 150°C and input UVLO/OVP protection - collectively ensuring robust fault handling without external circuitry. This behavior is explicitly documented in the "Current Limiting" section of the datasheet.
Is the FAN53200UC44X pin-compatible with other variants in the FAN53200 family?
Yes - all FAN53200 variants, including FAN53200UC35X and FAN53200UC44X, share identical WLCSP-20 package (Case 567SH), pin assignment, and footprint. Differences are limited to factory-programmed register defaults (VSEL0/VSEL1 voltages and BUCK_EN bits), not physical layout. The datasheet confirms uniform pin descriptions in Table 1 and identical mechanical drawings across variants - enabling direct PCB reuse when migrating between FAN53200UC44X and other UC-series parts.
FAN53200UC44X 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)
FAN53200UC44X FAQ
1.How can I place an order for FAN53200UC44X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN53200UC44X 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 FAN53200UC44X reliable?
The price and inventory of FAN53200UC44X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN53200UC44X is usually 5 days.
3.What payment methods are accepted for FAN53200UC44X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN53200UC44X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN53200UC44X?
FAN53200UC44X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN53200UC44X 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 FAN53200UC44X?
For technical support, including FAN53200UC44X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN53200UC44X requirements.
6.How does Aetrix verify that FAN53200UC44X is sourced from the original manufacturer or authorized distributors?
All FAN53200UC44X 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 FAN53200UC44X meets industry standards.
7.What is the process for return or replacement of FAN53200UC44X?
All FAN53200UC44X units undergo pre-shipment inspection (PSI). If there is an issue with FAN53200UC44X, 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 FAN53200UC44X part is unused and in its original packaging.
Return procedure for FAN53200UC44X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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