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onsemi FAN5362UC27X
- Part No.:
- FAN5362UC27X
- Manufacturer:
- onsemi
- Package:
- 6-UFBGA, WLCSP
- Datasheet:
-
FAN5362UC27X.pdf
- Description:
- IC REG BUCK 2.7V 500MA 6WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:3,672
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Product details
Overview
FAN5362UC27X from ON Semiconductor is a fixed-output, synchronous buck DC-DC regulator delivering 2.7V at up to 500mA from a 2.7V–5.5V input supply. It operates at 3MHz fixed frequency with 45µA quiescent current in PFM mode and features seamless 100% duty-cycle operation for low-dropout regulation-ideal for powering RF transceivers and SD flash memory in space-constrained mobile devices.
For engineers reviewing the FAN5362UC27X datasheet, pinout, applications, or equivalent options, key selection considerations include its WLCSP-6 package (0.4mm pitch), ±3% output voltage accuracy at 500mA, thermal shutdown at 150°C, forced PWM capability via MODE pin, and compatibility with 1µH inductors and 4.7µF ceramic output capacitors.
Technical Context
The FAN5362UC27X employs a proprietary non-linear fixed-frequency PWM modulator with synchronous rectification, enabling >96% peak efficiency and >90% efficiency down to 1mA load. Its control architecture maintains constant 3MHz switching across wide VIN and IOUT ranges while supporting automatic PFM/PWM transitions with <18mV VOUT glitch.
It integrates internal soft-start with exponential ramping, active FB discharge during shutdown, input UVLO (2.6V threshold, 175mV hysteresis), and cycle-by-cycle peak-current limiting (800–1150mA depending on VOUT). Thermal shutdown activates at 150°C with 15°C hysteresis, and minimum off-time (35ns) governs low-VIN frequency droop behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.7V ±3% over 0–500mA load and –40°C to +85°C ambient |
| Input Voltage Range | 2.7V to 5.5V - supports single-cell Li-ion and regulated 3.3V/5V rails |
| Switching Frequency | 3.0MHz nominal - enables use of 1µH inductor and compact 0603 ceramic capacitors |
| Quiescent Current | 45µA typical in PFM mode - extends battery life in standby without sacrificing transient response |
| Output Current | 500mA continuous - guaranteed with ≥300mV headroom (VIN ≥ VOUT + 300mV) |
| Efficiency | Peak >96%; >90% at 1mA - maintained across light-to-heavy loads via adaptive PFM/PWM |
| Thermal Shutdown | 150°C activation with 15°C hysteresis - protects die under sustained overload or high ambient |
Pinout & Package
Package: Wafer-Level Chip-Scale Package (WLCSP-6), 2×3 bump array, 0.4mm pitch, 0.547–0.625mm height, bottom-side solder bumps.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | MODE | Configures operating mode: logic HIGH forces PWM; logic LOW enables auto PFM/PWM transition; also accepts external sync clock (×2 frequency) |
| B1 | SW | Switching node - connects directly to inductor; carries high di/dt pulses; requires tight layout to minimize EMI |
| C1 | FB | Feedback input - internally connected to 2.7V reference; no external resistor divider needed |
| C2 | GND | Power and signal ground - all voltages referenced here; must be low-impedance connection to PCB ground plane |
| B2 | EN | Enable control - device enabled above 1.2V; shutdown below 0.4V; draws <1µA in shutdown |
| A2 | VIN | Main power input - accepts 2.7–5.5V; requires local 2.2µF ceramic capacitor placed adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Seamless 100% duty-cycle operation | Enables dropout as low as ~150mV at 500mA (via RDS(on)PMOS + DCRL), eliminating need for LDO post-regulation |
| PFM/PWM auto-transition | Glitch-free mode switching (<18mV VOUT disturbance) preserves output regulation during dynamic load changes |
| Internal soft-start | 180–300µs exponential ramp prevents output overshoot and limits inrush into large COUT or pre-biased loads |
| UVLO with hysteresis | 2.6V turn-on threshold with 175mV hysteresis ensures clean startup and avoids oscillation near brownout conditions |
| Synchronous rectification | Reduces conduction losses vs. diode-based buck; achieves >96% peak efficiency without external MOSFETs |
Applications
| RF Transceiver Power | SD Flash Memory Supply |
|---|---|
Use Scenario: Powering LTE/WiFi transceiver ICs requiring stable 2.7V rail with fast load transient response during TX bursts. IC Role / Device Role / Timing Role: Primary step-down regulator supplying core VCC for RF front-end ICs. Use Value: 3MHz switching minimizes output ripple and enables small 1µH inductor; PFM mode maintains >90% efficiency at µA-level standby currents. |
Use Scenario: Providing regulated 2.7V to high-speed SD card controllers during read/write cycles with bursty 100–400mA loads. IC Role / Device Role / Timing Role: Dedicated buck converter for embedded storage interface power domain. Use Value: Best-in-class load transient response prevents VOUT sag during sudden current demands; WLCSP-6 footprint saves board area in thin mobile modules. |
| Smartphone Application Processor Core | Ultra-Mobile PC SoC I/O Rail |
Use Scenario: Supplying 2.7V I/O voltage to application processors in smartphones where space and thermal density are critical. IC Role / Device Role / Timing Role: Secondary buck regulator for processor I/O supply, co-located near SoC BGA. Use Value: 0.55mm max height WLCSP allows placement under narrow-pitch SoC packages; thermal resistance of 150°C/W suits thermally constrained layouts. |
Use Scenario: Delivering 2.7V to USB 3.0 PHY or PCIe Gen1 I/O buffers in fanless ultra-mobile PCs with strict power budgets. IC Role / Device Role / Timing Role: Efficient point-of-load regulator for high-speed serial interface power domains. Use Value: Forced PWM mode eliminates frequency variation for EMI-sensitive designs; 45µA quiescent current reduces idle power draw. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | 2.7V fixed output, 500mA, 3MHz, but uses 1.2V reference + external resistors; no integrated FB | Requires external feedback network; lacks seamless 100% duty-cycle mode and PFM/PWM auto-transition | Select when design requires adjustable output or tighter tolerance than ±3% - otherwise FAN5362UC27X offers simpler layout and superior light-load efficiency. |
| RT8059GJ6 | 2.7V fixed output, 600mA, 2.5MHz, WLCSP-6, but higher IQ (60µA) and no MODE pin for forced PWM or sync | No external clock synchronization; less robust load transient response per datasheet graphs | Choose if slightly higher current rating is prioritized over efficiency at microamp loads or EMI-controlled sync capability. |
Compared with TPS62231DRYR and RT8059GJ6, the FAN5362UC27X delivers superior light-load efficiency (45µA IQ), integrated seamless 100% duty-cycle operation, and flexible MODE pin functionality - making it optimal for battery-powered mobile systems demanding minimal quiescent power and compact footprint.
Availability
FAN5362UC27X is available at Aetrix Electronics and suitable for RF transceiver power, SD flash memory supply, and smartphone application processor I/O rail applications requiring stable component supply, long-term lifecycle support, and consistent WLCSP-6 packaging.
Supply support for FAN5362UC27X 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
ON Semiconductor is a global semiconductor supplier specializing in energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and mobile markets.
The FAN5362UC27X belongs to ON Semiconductor's high-frequency synchronous buck regulator product line, designed specifically for space- and power-constrained portable electronics requiring ultra-small footprint, high efficiency across load range, and fast transient response.
FAQ
What is the output voltage tolerance of the FAN5362UC27X over temperature and load?
The FAN5362UC27X provides a fixed 2.7V output with ±3% accuracy across 0–500mA load and –40°C to +85°C ambient temperature. This specification holds when VIN ≥ VOUT + 300mV (i.e., VIN ≥ 3.0V). At lighter loads or higher VIN, output voltage remains within tighter bounds per the Electrical Characteristics table in the datasheet. The FAN5362UC27X does not require external feedback components due to its internally trimmed reference.
Can the FAN5362UC27X operate with input voltage equal to its 2.7V output?
Yes - the FAN5362UC27X supports seamless transition into 100% duty-cycle operation when VIN approaches or equals VOUT. In this mode, output voltage follows VIN minus dropout determined by PMOS RDS(on) and inductor DCR. Minimum dropout is ~150mV at 500mA, allowing functional regulation down to VIN ≈ 2.85V. The FAN5362UC27X exits 100% mode smoothly without overshoot when VIN recovers.
How does the MODE pin affect FAN5362UC27X operation?
The MODE pin on the FAN5362UC27X controls modulation mode and synchronization: logic LOW enables automatic PFM/PWM transition for best light-load efficiency; logic HIGH forces continuous PWM for fixed-frequency operation and reduced ripple. When driven with a square wave, the FAN5362UC27X synchronizes its switching to twice the MODE pin frequency - a feature not available on most competing 3MHz regulators.
What is the recommended output capacitor for the FAN5362UC27X?
The FAN5362UC27X is optimized for 4.7µF ceramic output capacitors (X5R/X7R, 0603 size), though values up to 24µF improve transient response and reduce ripple. Capacitances >24µF may prevent startup due to excessive displacement current during soft-start. The FAN5362UC27X does not require ESR tuning - it remains stable with low-ESR ceramics, unlike many older buck controllers.
Is the FAN5362UC27X pin-compatible with other variants in the FAN5362 family?
Yes - all FAN5362 variants (e.g., FAN5362UC21X, FAN5362UC25X, FAN5362UC27X) share identical WLCSP-6 pinout and package dimensions. Output voltage is factory-trimmed and non-adjustable; swapping variants requires only PCB-level voltage verification and no layout change. The FAN5362UC27X is functionally and mechanically interchangeable with other UC-series members in the same package.
FAN5362UC27X 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):
- 2.9V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.7V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 3MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-WLCSP (1.23x0.88)
FAN5362UC27X FAQ
1.How can I place an order for FAN5362UC27X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN5362UC27X 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 FAN5362UC27X reliable?
The price and inventory of FAN5362UC27X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN5362UC27X is usually 5 days.
3.What payment methods are accepted for FAN5362UC27X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN5362UC27X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN5362UC27X?
FAN5362UC27X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN5362UC27X 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 FAN5362UC27X?
For technical support, including FAN5362UC27X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN5362UC27X requirements.
6.How does Aetrix verify that FAN5362UC27X is sourced from the original manufacturer or authorized distributors?
All FAN5362UC27X 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 FAN5362UC27X meets industry standards.
7.What is the process for return or replacement of FAN5362UC27X?
All FAN5362UC27X units undergo pre-shipment inspection (PSI). If there is an issue with FAN5362UC27X, 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 FAN5362UC27X part is unused and in its original packaging.
Return procedure for FAN5362UC27X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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