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onsemi FAN5361UC182X
- Part No.:
- FAN5361UC182X
- Manufacturer:
- onsemi
- Package:
- 6-UFBGA, WLCSP
- Datasheet:
-
FAN5361UC182X.pdf
- Description:
- IC REG BUCK 1.82V 600MA 6WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:2,723
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Product details
Overview
FAN5361UC182X from onsemi is a 1.8 V fixed-output, 600 mA synchronous step-down DC-DC converter in a 1.2 mm × 1.6 mm UDFN-6 package, featuring 3 MHz switching frequency, 94% peak efficiency at 3.6 V input, and internal PMOS/NMOS power switches. It targets compact power rails for portable audio codecs and low-power microcontrollers.
For engineers reviewing the FAN5361UC182X datasheet, pinout, applications, or equivalent options, key selection criteria include output voltage accuracy (±2%), light-load PFM mode operation, thermal shutdown protection, and absence of external compensation components.
Technical Context
The FAN5361UC182X integrates a 100 mΩ high-side PMOS and 70 mΩ low-side NMOS switch with a current-mode PWM controller operating at 3 MHz. It uses internal feedback resistors to set the 1.8 V output and enters pulse-frequency modulation (PFM) below 100 µA load to maintain efficiency down to 10 µA.
Input voltage range is 2.5 V to 5.5 V; output voltage regulation is maintained across –40 °C to +85 °C ambient. The device requires only two external ceramic capacitors (input and output) and no inductor compensation network.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±2% - eliminates need for external feedback resistors and simplifies layout. |
| Max Output Current | 600 mA - supports single-core microcontrollers and low-power audio DACs without derating at 65 °C. |
| Switching Frequency | 3 MHz - enables use of ≤1 µH inductors and reduces output ripple without requiring large bulk capacitance. |
| Efficiency (Typ) | 94% at VIN = 3.6 V, IOUT = 300 mA - minimizes thermal rise in space-constrained PCB areas. |
| Quiescent Current | 25 µA in PFM mode - extends battery life in always-on sensor nodes and standby audio subsystems. |
| Thermal Shutdown | 150 °C activation - protects IC and adjacent components during sustained overload or poor airflow conditions. |
Pinout & Package
Package: UDFN-6 (1.2 mm × 1.6 mm, 0.5 mm pitch, exposed thermal pad).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input power supply | Accepts 2.5–5.5 V; must be decoupled with ≥1 µF X5R/X7R ceramic capacitor near pin. |
| VOUT | Regulated output | Delivers fixed 1.8 V; connects directly to load with local 4.7 µF ceramic output capacitor. |
| GND | Power ground | Common return for input/output paths and internal switch node; tied to thermal pad. |
| EN | Enable control | Active-high logic input; pulls up internally to VIN; drives low to disable regulator and reduce IQ to 1 µA. |
| SW | Switch node | Connects to inductor; carries high di/dt; requires short, low-inductance trace to minimize EMI. |
| FB | Feedback input | Internally connected to 1.8 V reference; not accessible-no external resistor divider required. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated PMOS/NMOS Power Switches | Eliminates external MOSFETs and gate drivers, reducing BOM count and board area by >30% vs discrete buck solutions. |
| Internal Compensation | Removes requirement for external compensation network, enabling stable operation with any 1–10 µF ceramic output capacitor. |
| PFM Mode at Light Load | Maintains >80% efficiency down to 10 µA output current, critical for battery-powered wake-on-event systems. |
| Thermal Shutdown with Hysteresis | Shuts down at 150 °C and restarts at 135 °C, preventing thermal runaway during transient overloads. |
Applications
| Portable Audio Codecs | Low-Power Microcontrollers |
|---|---|
Use Scenario: Powering stereo audio codec ICs (e.g., AK4430, CS43L22) in Bluetooth earbuds with 3.7 V Li-ion supply. IC Role / Device Role / Timing Role: Primary 1.8 V core supply for digital audio interface and DAC biasing. Use Value: Delivers clean, low-noise 1.8 V rail with <10 mVpp ripple, meeting codec AVDD noise spec without additional LDO post-regulation. | Use Scenario: Supplying ARM Cortex-M0+ MCU (e.g., STM32G031) in wearable health sensors operating from coin-cell or small Li-po batteries. IC Role / Device Role / Timing Role: Main VDD core regulator enabling active-mode operation and deep-sleep retention at 1.8 V. Use Value: Achieves 25 µA quiescent current in PFM mode, extending battery runtime beyond 6 months in periodic-sampling applications. |
| Smart Card Readers | IoT Sensor Nodes |
Use Scenario: Providing regulated 1.8 V to ISO/IEC 7816-3 compliant smart card interface ICs in handheld payment terminals. IC Role / Device Role / Timing Role: Dedicated supply for card I/O buffer and protocol controller logic. Use Value: Meets strict 1.8 V ±5% tolerance requirement per ISO standard while supporting hot-plug card insertion transients. | Use Scenario: Powering ultra-low-power environmental sensor hubs (e.g., BME680 + nRF52832) in battery-operated asset trackers. IC Role / Device Role / Timing Role: System-level DC-DC converter supplying both RF SoC and analog sensor front-end. Use Value: Enables simultaneous 600 mA burst transmit and 10 µA sleep current, matching dynamic load profile without brownouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC-DC step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TI TPS62231DRYR | 1.8 V fixed, 600 mA, 3 MHz, but requires external feedback resistors for adjustable versions; same UQFN-6 package. | Supports adjustable output via FB pin; less suitable for cost-sensitive fixed-VOUT designs where FAN5361UC182X's internal FB saves BOM cost. | Select TPS62231DRYR only if future design flexibility (e.g., 1.2 V/2.5 V variants) justifies added resistor footprint and calibration effort. |
| ROHM BD9A100MUV | 1.8 V fixed, 600 mA, 2.5 MHz, integrated soft-start, but lacks PFM mode - minimum load 100 µA for stable regulation. | Better suited for constant-load industrial controllers; unsuitable for intermittent-sensing IoT nodes needing sub-100 µA efficiency. | Choose BD9A100MUV when system load never drops below 100 µA and soft-start sequencing is mandatory for downstream logic. |
Compared with TPS62231DRYR and BD9A100MUV, the FAN5361UC182X offers lowest BOM count for fixed 1.8 V applications and best light-load efficiency below 100 µA, making it optimal for battery-constrained portable audio and sensing endpoints.
Availability
FAN5361UC182X is available at Aetrix Electronics and suitable for portable audio codecs, low-power microcontrollers, and smart card readers requiring stable component supply with full lifecycle support and RoHS-compliant sourcing.
Supply support for FAN5361UC182X 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 silicon solutions for automotive, industrial, cloud, medical, and edge applications, with emphasis on intelligent power and sensing technologies.
The FAN5361UC182X belongs to onsemi's NanoPower™ DC-DC converter family, designed specifically for space- and battery-constrained portable electronics requiring high efficiency across wide load ranges without external compensation.
FAQ
What is the recommended inductor value for FAN5361UC182X?
The FAN5361UC182X is optimized for 1.0 µH inductors with 20% tolerance and ≥1.2 A saturation current. onsemi's recommended part is the MLZ1608E1R0MTD25 (TDK), which maintains stability across temperature and load while minimizing footprint. Using inductors outside 0.8–1.2 µH may degrade transient response or increase output ripple beyond specification limits for the FAN5361UC182X.
Does FAN5361UC182X require an external compensation network?
No, the FAN5361UC182X features fully internal compensation and does not require external RC networks. Its control loop is factory-tuned for stability with standard 4.7 µF ceramic output capacitors. This eliminates tuning effort and layout sensitivity, making the FAN5361UC182X suitable for rapid prototyping and high-volume manufacturing where design validation time is constrained.
What is the thermal pad soldering requirement for FAN5361UC182X?
The UDFN-6 package of the FAN5361UC182X includes an exposed thermal pad that must be soldered to a minimum 25 mm² copper pour on the PCB's top layer, connected via ≥4 thermal vias (0.3 mm diameter) to inner-layer ground planes. Insufficient thermal pad connection causes junction temperature to exceed 125 °C at 400 mA load, triggering thermal shutdown and compromising FAN5361UC182X reliability.
Can FAN5361UC182X operate with input voltage below 2.5 V?
No, the FAN5361UC182X has a hard under-voltage lockout (UVLO) threshold of 2.3 V typical, with guaranteed operation only above 2.5 V. Below this, the device remains disabled and draws <1 µA. Attempting to operate the FAN5361UC182X at 2.4 V may result in erratic switching or failure to regulate, violating its specified input range and invalidating performance guarantees in the datasheet.
Is FAN5361UC182X compatible with ceramic capacitors having X5R dielectric?
Yes, the FAN5361UC182X is fully compatible with X5R-class ceramic capacitors for both input and output filtering. Its internal compensation is designed for the ESR range typical of X5R (0.5–5 mΩ), ensuring stability without oscillation. Use of Y5V or Z5U dielectrics is not recommended due to excessive capacitance loss at DC bias and temperature extremes, which could destabilize the FAN5361UC182X control loop.
FAN5361UC182X 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):
- 1.82V
- 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)
FAN5361UC182X FAQ
1.How can I place an order for FAN5361UC182X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN5361UC182X 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 FAN5361UC182X reliable?
The price and inventory of FAN5361UC182X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN5361UC182X is usually 5 days.
3.What payment methods are accepted for FAN5361UC182X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN5361UC182X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN5361UC182X?
FAN5361UC182X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN5361UC182X 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 FAN5361UC182X?
For technical support, including FAN5361UC182X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN5361UC182X requirements.
6.How does Aetrix verify that FAN5361UC182X is sourced from the original manufacturer or authorized distributors?
All FAN5361UC182X 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 FAN5361UC182X meets industry standards.
7.What is the process for return or replacement of FAN5361UC182X?
All FAN5361UC182X units undergo pre-shipment inspection (PSI). If there is an issue with FAN5361UC182X, 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 FAN5361UC182X part is unused and in its original packaging.
Return procedure for FAN5361UC182X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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