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onsemi FAN5362UC33X
- Part No.:
- FAN5362UC33X
- Manufacturer:
- onsemi
- Package:
- 6-UFBGA, WLCSP
- Datasheet:
-
FAN5362UC33X.pdf
- Description:
- IC REG BUCK 3.3V 500MA 6WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:3,502
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Product details
Overview
FAN5362UC33X from ON Semiconductor is a 3.3V fixed-output, 500mA synchronous buck regulator operating at 3MHz with 45µA quiescent current and 2.7–5.5V input range. It delivers peak efficiency of 96% and supports seamless 100% duty-cycle operation for low-dropout scenarios in portable RF and memory power supplies.
For engineers reviewing the FAN5362UC33X datasheet, pinout, applications, or equivalent options, key selection criteria include its WLCSP-6 package footprint, PFM/PWM mode control via MODE pin, thermal shutdown at 150°C, and compatibility with 1µH inductors and 4.7–10µF ceramic output capacitors.
Technical Context
The FAN5362UC33X employs a proprietary non-linear fixed-frequency PWM modulator with synchronous rectification to achieve fast load transient response independent of output capacitor ESR. Its control loop maintains constant 3MHz switching across wide VIN and ILOAD ranges until tOFF(MIN) (35ns) forces frequency reduction near 100% duty cycle.
It integrates internal soft-start with exponential ramping, active FB discharge during shutdown, and dual-mode operation: forced PWM (MODE = HIGH) or auto-switching between PFM (light load, 45µA IQ) and PWM (≥500mA). UVLO triggers at 2.6V with 175mV hysteresis, and thermal shutdown activates at 150°C with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3% (guaranteed over 0–500mA, VIN ≥ VOUT + 300mV) |
| Max Output Current | 500mA continuous (verified at VOUT = 3.3V, TA ≤ +85°C) |
| Input Voltage Range | 2.7V to 5.5V (minimum VIN = max[2.7V, VOUT + 300mV]) |
| Switching Frequency | 3.0MHz nominal (2.7–3.3MHz range; synchronizable to external clock) |
| Quiescent Current | 45µA typical in PFM mode (enables >90% efficiency down to 1mA load) |
| Efficiency Peak | 96% at full load (VIN = 3.6V, VOUT = 3.3V), >90% maintained from 1mA to 500mA |
| Thermal Shutdown | Activates at TJ = 150°C with 20°C hysteresis (protects die under overload/high-ambient conditions) |
Pinout & Package
Package: 6-bump Wafer-Level Chip-Scale Package (WLCSP), 0.4mm pitch, 2×3 array, 547–625µm height, bottom-side bumps.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | MODE | Mode control: HIGH forces PWM-only; LOW enables auto PFM/PWM; also accepts sync clock (×2 frequency) |
| B1 | SW | Switching node: connects to inductor; carries high di/dt pulsed current; requires tight layout to GND |
| C1 | FB | Feedback input: directly connected to VOUT; no external resistor divider (fixed-output variant) |
| C2 | GND | Power and signal ground: primary return path for SW, VIN, EN, MODE; must be low-impedance plane |
| B2 | EN | Enable input: active HIGH (>1.2V); <0.4V disables IC and discharges FB to GND via 230Ω |
| A2 | VIN | Input supply: 2.7–5.5V; requires local 2.2µF ceramic capacitor placed adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Seamless 100% duty-cycle transition | Enables dropout operation down to VIN = VOUT + ILOAD × (RDS(on)_PMOS + DCRL) without overshoot or regulation loss |
| PFM/PWM auto-mode switching | Maintains 45µA IQ in light-load PFM while preserving <18mV glitch-free transitions to full 3MHz PWM at higher loads |
| Internal soft-start with exponential ramp | Prevents output overshoot and limits inrush; 180–300µs ramp time avoids current-limit fault during startup into pre-charged loads |
| Thermal and overload protection | Shuts down at 150°C junction temperature and cycles recovery after ~2.9ms; latches off for short-circuit events |
| Low-noise 3MHz fixed-frequency operation | Reduces external component size: enables 1µH inductor and 4.7µF ceramic output capacitor (0603) |
Applications
| SD Flash Memory Power Supply | RF Transceiver Power |
|---|---|
Use Scenario: Powering NAND/NOR flash in smartphones and tablets where supply must remain stable during burst read/write cycles. IC Role / Device Role / Timing Role: Primary DC/DC converter delivering regulated 3.3V from shared battery rail; handles rapid 0–500mA load transients. Use Value: Best-in-class load transient response minimizes VOUT droop (<15mV), preventing data corruption during high-speed access. | Use Scenario: Supplying voltage to LTE/WiFi transceivers during TX/RX mode switching with dynamic current demand. IC Role / Device Role / Timing Role: Dedicated LDO-replacement buck regulator providing clean, efficient 3.3V to RF front-end ICs. Use Value: 96% peak efficiency and 45µA PFM IQ extend battery life; 3MHz switching avoids interference in sensitive RF bands. |
| Smartphone Application Processor Core | Ultra-Mobile PC I/O Rail |
Use Scenario: Powering auxiliary I/O domains (USB PHY, display interface) in battery-constrained mobile SoC platforms. IC Role / Device Role / Timing Role: Secondary buck regulator supplying fixed 3.3V to peripheral subsystems with moderate, variable load profiles. Use Value: Small 0.4mm-pitch WLCSP-6 footprint saves PCB area; thermal resistance of 150°C/W suits compact stacked-die layouts. | Use Scenario: Providing stable 3.3V to embedded controllers and sensors in fanless ultra-mobile PCs and netbooks. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator supporting always-on functions with low standby power. Use Value: <1µA shutdown current and PFM mode enable multi-week battery hold-up; 2.7V min VIN supports aging Li-ion cells. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRVR | 3.3V fixed, 600mA, 3.6MHz, 17µA IQ, WSON-6 (2×2mm) | Higher switching frequency allows smaller inductor; lower IQ improves ultra-light-load efficiency | Preferred when board space permits WSON and sub-10µA standby is critical |
| RT8059GJ6 | 3.3V fixed, 500mA, 2.5MHz, 25µA IQ, WDFN-6 (2×2mm) | Slightly lower fSW and IQ; different MODE logic (active-low vs. FAN5362's active-high PWM force) | Valid alternative where 2.5MHz is acceptable and layout accommodates WDFN-6 land pattern |
Compared with TPS62231DRVR and RT8059GJ6, the FAN5362UC33X offers superior load transient response and seamless 100% duty-cycle operation but uses a finer-pitch WLCSP-6 requiring tighter assembly control; its 45µA IQ sits between the two alternatives, balancing light-load efficiency and transient performance.
Availability
FAN5362UC33X is available at Aetrix Electronics and suitable for smartphone power management, RF transceiver supply, and SD flash memory applications requiring stable component supply, long-lifecycle support, and consistent wafer-level packaging.
Supply support for FAN5362UC33X 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 manufacturer specializing in energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The FAN5362UC33X belongs to ON Semiconductor's high-frequency synchronous buck regulator product line, designed specifically for space-constrained portable electronics requiring ultra-small footprint, high efficiency across load range, and robust transient performance.
FAQ
What is the recommended input capacitor for FAN5362UC33X?
The FAN5362UC33X requires a minimum 2.2µF X5R ceramic capacitor placed directly between VIN and GND, using 0402 or 0603 case size. This capacitor must be located adjacent to the VIN and GND pins to minimize parasitic inductance and ensure stable operation under high di/dt switching. Larger values improve input ripple suppression but are not required for basic functionality.
Does FAN5362UC33X support external frequency synchronization?
Yes, the FAN5362UC33X supports external clock synchronization via the MODE pin. When a square wave is applied to MODE, the regulator synchronizes its switching frequency to twice the input frequency (e.g., 1.5MHz input yields 3MHz output). This feature enables noise-sensitive system designs to avoid beat frequencies and align switching with other system clocks.
What is the maximum output capacitance allowed for FAN5362UC33X?
The FAN5362UC33X supports output capacitance up to 24µF. Exceeding this value may prevent successful startup due to excessive displacement current during soft-start, triggering current-limit protection. Recommended COUT is 4.7–10µF (X5R, 0603), which balances ripple reduction, transient response, and reliable startup behavior.
How does the MODE pin affect FAN5362UC33X operation?
The MODE pin on FAN5362UC33X controls operating mode: logic HIGH forces continuous PWM (fixed 3MHz), logic LOW enables automatic PFM/PWM switching for optimal light-load efficiency. It also serves as a synchronization input - toggling MODE at half the desired fSW locks the regulator to 2× that frequency. The pin must never be left floating and requires a series resistor if VIN exceeds 4.5V.
What thermal performance can be expected from FAN5362UC33X in WLCSP-6 package?
In its 6-bump WLCSP package, the FAN5362UC33X has a typical junction-to-ambient thermal resistance (θJA) of 150°C/W on a standard four-layer PCB per JEDEC JESD51. At 500mA output and 3.6V input, power dissipation remains below 120mW, resulting in <18°C junction rise above ambient - well within the 125°C max operating junction temperature limit.
FAN5362UC33X 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):
- 3.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 3.3V
- 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)
FAN5362UC33X FAQ
1.How can I place an order for FAN5362UC33X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN5362UC33X 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 FAN5362UC33X reliable?
The price and inventory of FAN5362UC33X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN5362UC33X is usually 5 days.
3.What payment methods are accepted for FAN5362UC33X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN5362UC33X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN5362UC33X?
FAN5362UC33X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN5362UC33X 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 FAN5362UC33X?
For technical support, including FAN5362UC33X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN5362UC33X requirements.
6.How does Aetrix verify that FAN5362UC33X is sourced from the original manufacturer or authorized distributors?
All FAN5362UC33X 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 FAN5362UC33X meets industry standards.
7.What is the process for return or replacement of FAN5362UC33X?
All FAN5362UC33X units undergo pre-shipment inspection (PSI). If there is an issue with FAN5362UC33X, 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 FAN5362UC33X part is unused and in its original packaging.
Return procedure for FAN5362UC33X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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