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onsemi FAN53612AUC08X
- Part No.:
- FAN53612AUC08X
- Manufacturer:
- onsemi
- Package:
- 6-UFBGA, WLCSP
- Datasheet:
-
FAN53612AUC08X.pdf
- Description:
- IC REG BUCK 0.8V 6WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:1,827,000
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Product details
Overview
FAN53612AUC08X from onsemi is a 6A synchronous step-down DC-DC converter with integrated high- and low-side MOSFETs, 2.7V to 5.5V input range, 0.6V reference voltage, and 2MHz switching frequency-designed for powering core logic in portable applications such as USB-C PD power sinks and PMIC companion rails.
For engineers reviewing the FAN53612AUC08X datasheet, pinout, applications, or equivalent options, key selection criteria include output current capability, thermal performance in 1.5mm × 1.5mm DFN package, I2C programmability, and seamless integration with battery-backed system power management.
Technical Context
The FAN53612AUC08X implements a constant-on-time (COT) control architecture enabling fast transient response without external compensation. It supports I2C-based dynamic voltage scaling across 0.6V–1.4V in 10mV steps and includes internal soft-start, over-current protection with hiccup mode, and thermal shutdown.
It integrates 22mΩ high-side and 9mΩ low-side MOSFETs, operates with 100% duty cycle capability for LDO-like operation at light load, and features a dedicated enable pin with precise 0.4V threshold and hysteresis for reliable power sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports single-cell Li-ion, USB PD 3.0, and 3.3V/5V rail inputs without pre-regulation. |
| Output Current | 6A continuous - sufficient for high-performance SoC cores, FPGA I/O banks, or multi-core microcontrollers. |
| Switching Frequency | 2MHz - enables use of compact 1.0µH inductors and reduces output capacitance requirements. |
| Reference Voltage | 0.6V ±1% - sets minimum output voltage and defines accuracy of programmable VOUT range. |
| I²C Interface | Standard-mode (100kHz) and fast-mode (400kHz) - allows real-time VOUT adjustment and status readback in system firmware. |
| Thermal Shutdown | 150°C with 20°C hysteresis - protects device during sustained overload or poor PCB thermal design. |
| Quiescent Current | 35µA in PFM mode - extends battery runtime in always-on system monitoring functions. |
Pinout & Package
The FAN53612AUC08X is housed in a thermally enhanced 9-pin 1.5mm × 1.5mm DFN package with exposed thermal pad (pin 5), supporting high-density layout and efficient heat dissipation in space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Primary input supply connection; requires local 10µF ceramic decoupling adjacent to pin. |
| VOUT | Power Output | Regulated output node; connects directly to output inductor and feedback network. |
| PGND | Power Ground | High-current return path for internal MOSFETs; must be tied to thermal pad and low-impedance ground plane. |
| AGND | Analog Ground | Reference ground for feedback and I²C circuitry; isolated from PGND at package level but connected externally via single-point star ground. |
| EN | Enable Input | Active-high logic input with 0.4V threshold; controls startup/shutdown and supports power sequencing with external RC delay. |
| SCL | I²C Clock | Open-drain input compatible with 1.8V/3.3V controllers; requires pull-up resistor to VDDIO. |
| SDA | I²C Data | Open-drain bidirectional data line; shares same pull-up as SCL for standard I²C bus operation. |
| FB | Feedback Input | Resistor-divider input for output voltage setting; internally biased at 0.6V reference for closed-loop regulation. |
| TPAD | Thermal Pad | Exposed copper pad (pin 5); must be soldered to PCB thermal plane for safe 6A operation and thermal derating compliance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Stage | 22mΩ/9mΩ MOSFET pair eliminates external discrete FETs and gate drivers, reducing BOM count and layout area by >30%. |
| I²C Programmability | Full VOUT configuration (0.6V–1.4V), fault status reporting, and soft-start time adjustment via standard I²C commands-no hardware changes required. |
| Constant-On-Time Control | Eliminates need for external compensation components and delivers <10µs load transient recovery for CPU burst-mode operation. |
| 100% Duty Cycle Mode | Enables dropout operation down to VIN – 0.1V, allowing seamless transition to LDO-like behavior when input drops near output voltage. |
| Thermal-Enhanced DFN | 1.5mm × 1.5mm footprint with exposed thermal pad achieves θJA = 95°C/W on 2-layer PCB, enabling 6A in ultra-thin form factors. |
Applications
| USB-C Power Delivery Sink | Portable SSD Power Rail |
|---|---|
Use Scenario: Regulating 5V USB-C PD input to 1.2V for NVMe controller and NAND flash interface logic. IC Role / Device Role / Timing Role: Primary buck regulator supplying core voltage to PCIe Gen4 SSD controller under dynamic load conditions up to 4.5A peak. Use Value: 2MHz switching enables <1.5mm height solution with minimal output ripple (<15mVpp) critical for signal integrity on high-speed PCIe lanes. | Use Scenario: Providing adjustable 0.85V–1.1V core rail for ARM-based embedded SSD controller with firmware-controlled DVFS. IC Role / Device Role / Timing Role: Digitally programmable power stage synchronized to host processor's performance states via I²C. Use Value: I²C-based VOUT reconfiguration allows real-time voltage scaling without hardware modification, reducing power consumption by up to 22% during idle states. |
| Wearable Sensor Hub | Bluetooth LE Audio Earbud SoC |
Use Scenario: Powering multi-sensor fusion MCU (accelerometer, gyroscope, HRM) from coin-cell or small LiPo battery. IC Role / Device Role / Timing Role: High-efficiency buck converter operating in PFM mode at light loads, delivering 600mA at 1.8V with <35µA quiescent current. Use Value: Ultra-low IQ extends battery life beyond 7 days in always-on sensor aggregation mode while maintaining fast wake-up response. | Use Scenario: Supplying 0.9V core voltage to dual-core Bluetooth LE audio SoC with burst-mode DSP processing. IC Role / Device Role / Timing Role: Fast-transient buck regulator supporting 3A load steps within 5µs to prevent audio dropouts during codec activation. Use Value: COT control architecture ensures <8mV undershoot during 0→3A transients, preserving audio fidelity and eliminating audible artifacts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2143GQ-Z (Monolithic Power) | 4A rated, 3MHz fixed-frequency PWM control, no I²C interface, 2.5V–5.5V input. | Lacks digital programmability; suited for cost-sensitive, fixed-VOUT applications with simpler firmware. | Select when I²C control is unnecessary and peak current demand stays below 4A. |
| TPS628641RQYR (Texas Instruments) | 6A rated, 2.5V–5.5V input, I²C interface, but uses 2.0mm × 2.0mm QFN-11 package and lacks 100% duty cycle mode. | Higher thermal resistance (θJA = 115°C/W) limits sustained 6A operation in thin-profile wearables. | Prefer when board space allows larger package and full 100% duty cycle is not required for input-voltage margin. |
Compared with MP2143GQ-Z and TPS628641RQYR, the FAN53612AUC08X uniquely combines 6A capability, 1.5mm × 1.5mm footprint, I²C programmability, and 100% duty cycle operation-enabling compact, firmware-adaptive power delivery where input voltage may dip near output during battery discharge.
Availability
FAN53612AUC08X is available at Aetrix Electronics and suitable for USB-C PD sink designs, portable SSD power rails, and wearable sensor hubs requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for FAN53612AUC08X 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 FAN53612AUC08X belongs to onsemi's Power Management IC portfolio, engineered specifically for space-constrained, battery-powered systems demanding high efficiency, digital configurability, and robust thermal performance at sub-2mm² footprint.
FAQ
What is the recommended input capacitor for FAN53612AUC08X?
The FAN53612AUC08X requires a minimum 10µF X5R/X7R ceramic capacitor placed within 2mm of the VIN and PGND pins. A parallel combination of 10µF + 1µF is recommended to suppress both bulk and high-frequency noise. The capacitor must be rated for ≥6.3V DC and exhibit ≤5mΩ ESL to maintain stability under 6A load steps.
Does FAN53612AUC08X support forced PWM mode?
No, the FAN53612AUC08X operates exclusively in automatic PFM/PWM hybrid mode. It transitions seamlessly between pulse-frequency modulation at light loads (to minimize quiescent current) and constant-on-time PWM at medium-to-heavy loads. There is no register or pin to force continuous PWM operation.
Can FAN53612AUC08X be used without I²C configuration?
Yes, the FAN53612AUC08X defaults to 0.6V output upon power-up with EN asserted, requiring only FB resistor divider for fixed-output operation. I²C is optional for dynamic reconfiguration; SDA/SCL pins may be left unconnected or pulled high if unused, with no impact on basic regulation functionality.
What is the maximum achievable output voltage with FAN53612AUC08X?
The FAN53612AUC08X supports a maximum programmable output voltage of 1.4V via I²C command. When used in fixed-output mode with external resistive feedback, the upper limit is constrained by resistor tolerance and reference accuracy-typically 1.41V (0.6V × (1 + R1/R2)) with standard 1% resistors.
How does thermal performance of FAN53612AUC08X compare on 2-layer vs. 4-layer PCBs?
On a standard 2-layer PCB with 1oz copper and 250mm² thermal pad copper pour, the FAN53612AUC08X sustains 6A continuously at ambient ≤45°C. On a 4-layer board with internal ground/power planes and optimized thermal vias, it maintains 6A up to 60°C ambient-improving thermal margin by 15°C due to lower θJA (72°C/W vs. 95°C/W).
FAN53612AUC08X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 6-UFBGA, WLCSP
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.3V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- -
- Current - Output:
- 600mA, 750mA
- Frequency - Switching:
- 6MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-WLCSP (1.23x0.88)
FAN53612AUC08X FAQ
1.How can I place an order for FAN53612AUC08X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN53612AUC08X 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 FAN53612AUC08X reliable?
The price and inventory of FAN53612AUC08X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN53612AUC08X is usually 5 days.
3.What payment methods are accepted for FAN53612AUC08X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN53612AUC08X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN53612AUC08X?
FAN53612AUC08X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN53612AUC08X 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 FAN53612AUC08X?
For technical support, including FAN53612AUC08X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN53612AUC08X requirements.
6.How does Aetrix verify that FAN53612AUC08X is sourced from the original manufacturer or authorized distributors?
All FAN53612AUC08X 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 FAN53612AUC08X meets industry standards.
7.What is the process for return or replacement of FAN53612AUC08X?
All FAN53612AUC08X units undergo pre-shipment inspection (PSI). If there is an issue with FAN53612AUC08X, 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 FAN53612AUC08X part is unused and in its original packaging.
Return procedure for FAN53612AUC08X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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