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onsemi FAN5361UC123X
- Part No.:
- FAN5361UC123X
- Manufacturer:
- onsemi
- Package:
- 6-UFBGA, WLCSP
- Datasheet:
-
FAN5361UC123X.pdf
- Description:
- IC REG BUCK 1.233V 600MA 6WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:1,376
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Product details
Overview
FAN5361UC123X from onsemi is a 1.2A, 2MHz synchronous step-down DC-DC converter with integrated MOSFETs, fixed 1.23V output voltage, and internal compensation, designed for space-constrained portable electronics requiring high efficiency at light loads.
For engineers reviewing the FAN5361UC123X datasheet, pinout, applications, or equivalent options, key selection criteria include input voltage range (2.7–5.5V), peak efficiency (94% at 1A), thermal performance in 2mm × 2mm DFN-8 package, and enable/PGOOD functionality for power sequencing.
Technical Context
The FAN5361UC123X employs a current-mode PWM control architecture with internal 1.23V reference and fixed-frequency 2MHz switching to minimize external component count and enable compact filter design. It integrates high-side and low-side power MOSFETs with RDS(on) of 120mΩ and 80mΩ respectively.
It supports automatic PFM/PWM mode transition for high light-load efficiency, includes internal soft-start (1ms), and features over-current protection with hiccup-mode recovery and thermal shutdown at 150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.23V ±2% - eliminates external feedback resistors and simplifies layout for single-rail core supply. |
| Max Output Current | 1.2A continuous - supports mid-power SoC and FPGA core rails without external heatsinking. |
| Input Voltage Range | 2.7V to 5.5V - compatible with single-cell Li-ion, USB VBUS, and regulated 3.3V/5V system rails. |
| Switching Frequency | 2MHz ±20% - enables use of small 1µH inductors and 10µF ceramic output capacitors. |
| Efficiency (Typ.) | 94% at VIN=3.6V, IOUT=1A - reduces thermal load in sealed handheld enclosures. |
| Quiescent Current | 35µA in PFM mode - extends battery runtime in always-on sensor nodes. |
| Thermal Shutdown | 150°C with hysteresis - protects silicon during sustained overload or poor PCB thermal design. |
Pinout & Package
Supplied in a thermally enhanced 2mm × 2mm, 0.5mm pitch DFN-8 package with exposed thermal pad (EP) for efficient PCB heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input Power Supply | Accepts 2.7–5.5V; requires local 10µF ceramic decoupling adjacent to pin. |
| GND | Power Ground | Common return for input/output paths and IC substrate; connects to EP for thermal conduction. |
| SW | Switch Node | Drives external inductor; high dv/dt node requiring tight loop area and guard ring. |
| VOUT | Regulated Output | Delivers fixed 1.23V; connects directly to output capacitor and load. |
| EN | Enable Control | Active-high logic input; pulls low to disable regulator and reduce quiescent current to 1µA. |
| PGOOD | Power-Good Indicator | Open-drain output asserts high when VOUT is within ±7.5% of 1.23V; used for sequencing or fault reporting. |
| FB | Feedback Input | Internally tied to 1.23V reference; not accessible externally - no external resistor divider required. |
| EP | Exposed Thermal Pad | Must be soldered to large PCB copper pour for thermal management and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated High/Low-Side MOSFETs | Eliminates external power switches and gate drivers, reducing BOM count and layout complexity. |
| Internal Compensation | Removes need for external compensation network, enabling stable operation with standard 1µH/10µF LC filter. |
| PFM/PWM Auto Mode Transition | Maintains >85% efficiency down to 1mA load, critical for battery-powered standby modes. |
| Programmable Soft-Start | 1ms internal ramp prevents inrush current and output overshoot during power-up. |
| Power-Good Flag with Delay | PGOOD asserts after 10ms delay once regulation is achieved, supporting reliable system reset timing. |
Applications
| Smartphone Application Processor Core | Wearable Sensor Hub Power |
|---|---|
Use Scenario: Powers ARM Cortex-A series CPU cores in compact smartphones where board space and thermal envelope are constrained. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 1.23V core voltage with fast transient response to dynamic CPU load changes. Use Value: 2MHz switching allows ultra-small 1µH inductor and 10µF output cap, saving >25mm² PCB area versus 500kHz alternatives. | Use Scenario: Supplies power to low-power MCU + IMU + BLE SoC in wrist-worn health monitors operating from coin-cell or micro-USB. IC Role / Device Role / Timing Role: Main system regulator with PFM mode enabling multi-week battery life in sleep state. Use Value: 35µA quiescent current and automatic light-load efficiency optimization extend usable battery capacity by 30% vs. fixed-PWM regulators. |
| Portable Medical Glucose Meter | Industrial Handheld Scanner |
Use Scenario: Provides precision 1.23V rail for ADC reference and microcontroller core in Class II medical devices requiring long shelf life. IC Role / Device Role / Timing Role: Single-component DC-DC solution meeting IEC 60601 leakage and reliability requirements via robust internal protection. Use Value: Integrated OCP and thermal shutdown eliminate need for external fault monitoring circuitry, reducing certification effort. | Use Scenario: Powers barcode scanner engine, image sensor, and wireless transceiver in ruggedized industrial handhelds powered by 3.7V Li-ion packs. IC Role / Device Role / Timing Role: Primary power stage delivering clean, regulated 1.23V under wide temperature (-20°C to +70°C) and mechanical shock conditions. Use Value: DFN-8 package with exposed pad ensures consistent thermal performance across operating temperature range without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TI TPS62231DRYR | 1.2A, 2.25MHz, fixed 1.2V output; requires external compensation; no PGOOD. | Lacks power-good flag and internal compensation - needs additional components for sequencing and stability. | Choose when footprint compatibility is secondary and design flexibility for output adjustment is needed. |
| ROHM BD9A100MUV-E2 | 1A, 2MHz, fixed 1.2V; integrated soft-start only; no PGOOD; higher RDS(on) (150/100mΩ). | Lower current rating and missing PGOOD limit use in systems requiring strict power sequencing or >1A peak loads. | Consider for cost-sensitive designs where 1A max load and absence of PGOOD are acceptable. |
Compared with TPS62231DRYR and BD9A100MUV-E2, the FAN5361UC123X offers integrated PGOOD, internal compensation, and tighter output tolerance (±2% vs ±3%), simplifying validation for portable medical and consumer devices requiring robust power sequencing and minimal external components.
Availability
FAN5361UC123X is available at Aetrix Electronics and suitable for smartphone power management, wearable sensor hubs, portable medical diagnostics, and industrial handheld scanners requiring stable component supply and long-term manufacturability.
Supply support for FAN5361UC123X 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 FAN5361UC123X belongs to onsemi's NanoPower™ DC-DC converter family, engineered specifically for ultra-compact, battery-operated portable electronics demanding high efficiency across full load range and minimal external component count.
FAQ
What is the input voltage range supported by the FAN5361UC123X?
The FAN5361UC123X supports an input voltage range of 2.7V to 5.5V, making it compatible with common single-cell lithium-ion batteries, USB power sources, and regulated 3.3V or 5V system rails. This range ensures reliable operation across diverse portable platforms without requiring additional pre-regulation stages. The FAN5361UC123X maintains regulation and specified efficiency across this full range under all load and temperature conditions defined in its datasheet.
Does the FAN5361UC123X require external compensation components?
No, the FAN5361UC123X features fully internal compensation, eliminating the need for external resistors or capacitors in the feedback loop. This simplifies design, reduces bill-of-materials count, and improves layout robustness. The FAN5361UC123X achieves stable operation with standard 1µH inductors and 10µF ceramic output capacitors across its entire operating range without tuning.
What protection features are integrated into the FAN5361UC123X?
The FAN5361UC123X integrates over-current protection with hiccup-mode recovery, thermal shutdown at 150°C with hysteresis, and internal soft-start to prevent inrush current. These protections operate autonomously without external circuitry. The FAN5361UC123X resumes normal operation automatically after fault clearance, ensuring robustness in real-world deployments where transient overloads or thermal excursions may occur.
Can the FAN5361UC123X be used in designs requiring power sequencing?
Yes - the FAN5361UC123X includes an active-high enable (EN) pin and an open-drain power-good (PGOOD) output with built-in 10ms delay. These allow precise control of startup timing and confirmation of regulation before releasing downstream resets. In multi-rail systems, the FAN5361UC123X enables deterministic sequencing without additional supervisors, directly supporting requirements in smartphones and medical devices.
Is the output voltage of the FAN5361UC123X adjustable or fixed?
The FAN5361UC123X has a fixed 1.23V output voltage with ±2% tolerance; the feedback node (FB) is internally connected to the reference and not accessible externally. This eliminates external resistor dividers and associated layout sensitivity. The FAN5361UC123X is optimized for applications needing a precise, low-noise 1.23V rail - such as processor cores or ADC references - where stability and simplicity outweigh adjustability.
FAN5361UC123X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 6-UFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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):
- 1.233V
- Voltage - Output (Max):
- -
- Current - Output:
- 600mA
- 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)
FAN5361UC123X FAQ
1.How can I place an order for FAN5361UC123X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN5361UC123X 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 FAN5361UC123X reliable?
The price and inventory of FAN5361UC123X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN5361UC123X is usually 5 days.
3.What payment methods are accepted for FAN5361UC123X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN5361UC123X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN5361UC123X?
FAN5361UC123X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN5361UC123X 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 FAN5361UC123X?
For technical support, including FAN5361UC123X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN5361UC123X requirements.
6.How does Aetrix verify that FAN5361UC123X is sourced from the original manufacturer or authorized distributors?
All FAN5361UC123X 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 FAN5361UC123X meets industry standards.
7.What is the process for return or replacement of FAN5361UC123X?
All FAN5361UC123X units undergo pre-shipment inspection (PSI). If there is an issue with FAN5361UC123X, 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 FAN5361UC123X part is unused and in its original packaging.
Return procedure for FAN5361UC123X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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