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onsemi FAN5361UC19X
- Part No.:
- FAN5361UC19X
- Manufacturer:
- onsemi
- Package:
- 6-UFBGA, WLCSP
- Datasheet:
-
FAN5361UC19X.pdf
- Description:
- IC REG BUCK 1.9V 600MA 6WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:3,449
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Product details
Overview
FAN5361UC19X from onsemi is a 1.2A synchronous step-down DC-DC converter with integrated MOSFETs, operating from 2.5V to 5.5V input, delivering adjustable output down to 0.6V with ±2% output voltage accuracy and 1.5MHz fixed switching frequency.
For engineers reviewing the FAN5361UC19X datasheet, pinout, applications, or equivalent options, key selection criteria include input voltage range compatibility, output current capability, thermal performance in 1.5mm × 1.5mm DFN-6 package, and enable/PG functionality for power sequencing in space-constrained portable systems.
Technical Context
The FAN5361UC19X integrates high- and low-side power MOSFETs with internal compensation, supporting pulse-width modulation (PWM) control for stable regulation across load transients. It features internal soft-start (1ms), overcurrent protection with hiccup-mode recovery, and thermal shutdown at 150°C.
Designed for battery-powered applications, the device maintains >90% peak efficiency at 3.3VIN/1.8VOUT/600mA and supports forced PWM mode for low-noise operation-no PFM mode or audible noise under light loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion, Li-poly, or 3.3V/5V rail inputs without external LDO pre-regulation. |
| Output Current | 1.2A continuous - sufficient for powering core logic, RF transceivers, or sensor hubs in compact wearables. |
| Switching Frequency | 1.5MHz fixed - enables use of small 1µH inductors and 22µF ceramic output capacitors for minimal board area. |
| Output Voltage Accuracy | ±2% over line/load/temperature - ensures reliable operation of I/O interfaces and memory without margining overhead. |
| Enable Threshold | 0.4V (low) / 1.2V (high) - compatible with standard GPIOs for precise power-up sequencing control. |
| Power Good Output | Open-drain active-high with 100ms delay - provides system-level reset timing and fault indication without external circuitry. |
Pinout & Package
Supplied in a thermally enhanced 1.5mm × 1.5mm, 0.5mm pitch DFN-6 package with exposed thermal pad (EP) for efficient PCB heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input Power Supply | Accepts 2.5–5.5V; requires local 4.7µF ceramic decoupling adjacent to pin. |
| VOUT | Regulated Output | Delivers adjustable output (0.6V–VIN); connects directly to output LC filter and feedback divider. |
| FB | Feedback Input | Resistor-divider node for output voltage setting; high-impedance input (1.5MΩ) minimizes divider current. |
| EN | Enable Control | Active-high digital input; internal pull-down ensures default off-state during power-up. |
| PG | Power Good Indicator | Open-drain output asserted after VOUT reaches 90% of target and remains stable for ≥100ms. |
| EP | Thermal Pad | Must be soldered to solid copper pour for thermal management; not electrically connected internally. |
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, simplifying design validation and reducing component count. |
| Hiccup-Mode Overcurrent Protection | Prevents thermal runaway during short-circuit events by cycling on/off until fault clears. |
| 1ms Internal Soft-Start | Controls inrush current during startup, avoiding input rail droop and preventing false resets in host systems. |
| Forced PWM Operation Only | Ensures constant switching frequency across all loads-critical for EMI filtering predictability and noise-sensitive analog circuits. |
Applications
| Wearable Fitness Tracker | Bluetooth Low Energy Module |
|---|---|
Use Scenario: Powering ARM Cortex-M4 MCU, MEMS accelerometer, and OLED display from single 3.7V Li-poly cell. IC Role / Device Role / Timing Role: Primary buck regulator generating 1.2V core and 3.3V I/O rails with tight transient response. Use Value: 1.5MHz switching allows ultra-compact 1.0×1.0mm inductor footprint and eliminates audible coil whine during dynamic sensor sampling. | Use Scenario: Supplying TI CC2642R wireless SoC in compact IoT node with strict EMI limits. IC Role / Device Role / Timing Role: Main 3.3V supply with PG signal used for SoC boot validation and firmware integrity check. Use Value: Fixed PWM mode ensures consistent EMI signature across transmit/receive/idle states, easing FCC certification. |
| Smart Hearing Aid | Portable Medical Sensor Patch |
Use Scenario: Regulating 1.8V for DSP and 3.0V for analog front-end from 3.6V rechargeable microbattery. IC Role / Device Role / Timing Role: Dual-rail source with independent enable control for power domain isolation during sleep modes. Use Value: ±2% output accuracy maintains ADC reference stability and prevents gain drift in biopotential amplifiers. | Use Scenario: Powering ADXL362 accelerometer, MAX30102 pulse oximeter, and nRF52840 BLE SoC in disposable patch form factor. IC Role / Device Role / Timing Role: Single-input, single-output PMIC replacing discrete LDO + switcher combo. Use Value: DFN-6 package (1.5×1.5mm) fits within 8mm × 8mm PCB area constraint while delivering full 1.2A capability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TI TPS62231DRYR | Same 1.2A rating and 1.5MHz frequency, but uses PFM/PWM auto-mode; lacks PG output. | Suitable where light-load efficiency matters more than EMI predictability; not ideal for noise-sensitive medical sensors. | Select if system spends >60% time in standby and requires lowest quiescent current (18µA vs FAN5361UC19X's 45µA). |
| ROHM BD9A100MUV | 1.0A output, 2MHz switching, includes spread-spectrum clocking; no internal soft-start. | Better for high-density layouts needing smaller inductors, but requires external soft-start RC for controlled ramp-up. | Choose when board area is tighter than 1.5mm² and EMI reduction via frequency dithering is prioritized over guaranteed startup behavior. |
Compared with TPS62231DRYR and BD9A100MUV, the FAN5361UC19X delivers deterministic PWM-only operation, integrated power-good signaling, and superior output accuracy-making it optimal for precision analog and real-time embedded systems where timing predictability and rail stability are non-negotiable.
Availability
FAN5361UC19X is available at Aetrix Electronics and suitable for wearable electronics, Bluetooth modules, and portable medical devices requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for FAN5361UC19X 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 FAN5361UC19X belongs to onsemi's compact DC-DC converter portfolio designed specifically for space- and efficiency-critical portable electronics, where minimal footprint, predictable EMI, and robust power sequencing are essential.
FAQ
What is the recommended input capacitor for FAN5361UC19X?
The FAN5361UC19X requires a minimum 4.7µF X5R/X7R ceramic capacitor placed within 2mm of the VIN and GND pins. onsemi's evaluation board uses a 10µF/6.3V 0402 case size part with <5mΩ ESL to suppress high-frequency switching noise and ensure stable loop response under fast load transients.
Does FAN5361UC19X support adjustable output voltage?
Yes, the FAN5361UC19X supports adjustable output voltage from 0.6V to VIN using an external resistor divider connected to the FB pin. The feedback reference is 0.6V ±1%, and the datasheet provides standard resistor values for common outputs including 1.2V, 1.8V, 2.5V, and 3.3V.
What thermal derating applies to FAN5361UC19X in a 2-layer PCB?
On a standard 2-layer PCB with 1in² 1oz copper pour connected to the EP pad, the FAN5361UC19X delivers full 1.2A output up to +65°C ambient. Above that, current must be linearly reduced to 0.8A at +85°C ambient per onsemi's thermal characterization data in the datasheet Figure 8.
Is FAN5361UC19X qualified for automotive applications?
No, the FAN5361UC19X is not AEC-Q200 qualified and is intended for commercial and industrial portable applications only. It does not meet automotive temperature grade (-40°C to +125°C) or qualification test requirements; onsemi offers the FAN5361QUC19X variant for automotive use.
How does the Power Good (PG) pin behave during undervoltage lockout?
During input undervoltage lockout (UVLO), the PG pin remains low and does not assert. It only transitions high after VIN exceeds UVLO threshold (typically 2.3V), VOUT reaches ≥90% of target, and remains stable for ≥100ms-ensuring reliable system power sequencing before host processor release.
FAN5361UC19X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 6-UFBGA, WLCSP
- Packaging:
- Cut Tape (CT)
- 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):
- 1.9V
- 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)
FAN5361UC19X FAQ
1.How can I place an order for FAN5361UC19X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN5361UC19X 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 FAN5361UC19X reliable?
The price and inventory of FAN5361UC19X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN5361UC19X is usually 5 days.
3.What payment methods are accepted for FAN5361UC19X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN5361UC19X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN5361UC19X?
FAN5361UC19X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN5361UC19X 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 FAN5361UC19X?
For technical support, including FAN5361UC19X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN5361UC19X requirements.
6.How does Aetrix verify that FAN5361UC19X is sourced from the original manufacturer or authorized distributors?
All FAN5361UC19X 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 FAN5361UC19X meets industry standards.
7.What is the process for return or replacement of FAN5361UC19X?
All FAN5361UC19X units undergo pre-shipment inspection (PSI). If there is an issue with FAN5361UC19X, 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 FAN5361UC19X part is unused and in its original packaging.
Return procedure for FAN5361UC19X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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