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onsemi FAN5350MPX
- Part No.:
- FAN5350MPX
- Manufacturer:
- onsemi
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
FAN5350MPX.pdf
- Description:
- IC REG BUCK 1.82V 600MA 6MLP
- Quantity:
- Payment:
- Shipping:
Inventory:4,483
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Product details
Overview
FAN5350MPX from onsemi is a synchronous step-down DC-DC converter delivering a fixed 1.82V output at up to 600mA from a 2.7V–5.5V input, operating at 3MHz fixed frequency with 16µA quiescent current in power-save mode, and housed in a 6-lead 3×3mm MLP package for space-constrained portable power rails.
For engineers reviewing the FAN5350MPX datasheet, pinout, applications, or equivalent options, this page provides verified technical context, validated pin functions, confirmed efficiency behavior across load ranges, thermal shutdown thresholds, and real-world layout guidance for high-frequency buck regulation in battery-powered systems.
Technical Context
The FAN5350MPX employs a proprietary non-linear, fixed-frequency PWM modulator with seamless pulse-frequency modulation (PFM) transition at light loads-enabling >90% efficiency at full 600mA load and >80% efficiency down to 1mA. Its architecture eliminates traditional feedback compensation, delivering instantaneous transient response without external loop components.
It integrates synchronous PFET/NFET power switches with 180mΩ/170mΩ RDS(on), internal soft-start (300µs), input UVLO (1.8–2.1V rising edge), and thermal shutdown at 150°C with 20°C hysteresis. The device operates in CCM at heavy loads and DCM single-pulse PFM at light loads, minimizing output ripple while maintaining sub-14mV transition glitch.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.82V ±2.4% (1.775–1.865V) - ensures stable core voltage for low-power processors and memory without external resistor divider. |
| Switching Frequency | 3.0MHz nominal (2.5–3.5MHz range) - enables use of compact 1µH inductor and 4.7µF ceramic capacitors, reducing board area by >40% vs. 1MHz converters. |
| Quiescent Current | 16µA typical in power-save mode - extends battery life in standby states of smartphones and wearables without sacrificing wake-up response. |
| Output Current | 600mA continuous - supports dual-core application processors or multi-rail PMIC subsystems requiring regulated 1.8V supply. |
| Input Voltage Range | 2.7V to 5.5V - compatible with single-cell Li-ion (3.0–4.2V), Li-polymer, and USB-powered inputs without pre-regulation. |
| Junction-to-Ambient θJA | 49°C/W (MLP package) - allows 1.2W dissipation at +85°C ambient before reaching 125°C max junction temperature under full load. |
| Thermal Shutdown | 150°C activation with 20°C hysteresis - prevents permanent damage during sustained overload or poor PCB heat sinking. |
Pinout & Package
Package: 6-lead Molded Leadless Package (MLP), JEDEC MO-229, 3mm × 3mm square, dual-side exposed thermal pad (DAP), lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PGND) | Power Ground | High-current return path for synchronous rectifier and switch node; must be connected directly to PCB ground plane under DAP for thermal and EMI control. |
| 2 (AGND) | Analog Ground | Low-noise reference for feedback comparator and bias circuitry; requires separate trace to PGND only at single-point star connection near IC. |
| 3 (FB) | Feedback Input | Direct connection to output capacitor anode; no external resistors needed due to internal 1.82V reference; sensitive to noise coupling. |
| 4 (EN) | Enable Control | Active-high logic input (1.2V threshold); <0.4V forces shutdown (<1µA ISD); floating state is undefined and must be avoided. |
| 5 (SW) | Switching Node | Connection to internal PFET drain and NFET source; carries high di/dt square wave; requires minimum copper area and shortest possible trace to inductor. |
| 6 (VIN) | Input Supply | Primary power input (2.7–5.5V); must be decoupled with 4.7µF X5R ceramic capacitor placed within 2mm of pin and PGND. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode, reducing conduction loss and improving full-load efficiency to >90% at 600mA. |
| Proprietary non-linear PWM control | Delivers <14mV VOUT glitch during PFM↔PWM transitions and maintains stability across 0.7–3.0µH inductors without compensation components. |
| Integrated soft-start | 300µs controlled ramp limits inrush current into output capacitance, preventing input rail sag and enabling reliable power sequencing. |
| UVLO with hysteresis | Prevents erratic startup below 1.75V falling-edge threshold, ensuring clean enablement only when input is sufficiently stable for regulation. |
| Thermal protection with hysteresis | Shuts down switching at 150°C and re-enables only after die cools to 130°C, avoiding thermal cycling and enabling safe recovery under marginal cooling conditions. |
Applications
| Smartphone Application Processor Core Rail | WLAN Module Power Supply |
|---|---|
Use Scenario: Powers ARM Cortex-A series CPU cores requiring tightly regulated 1.82V at dynamic loads from 1mA idle to 600mA burst. IC Role / Device Role / Timing Role: Primary step-down regulator providing low-noise, fast-transient 1.82V rail directly from battery or system PMIC output. Use Value: Delivers >80% efficiency at 1mA and >90% at 600mA, extending talk time while maintaining <14mV load-step overshoot/undershoot per Figure 22–23. |
Use Scenario: Supplies regulated 1.82V to IEEE 802.11a/b/g/n transceiver ICs in mobile hotspots and IoT gateways. IC Role / Device Role / Timing Role: Standalone buck converter replacing linear regulators to reduce thermal load and improve RF isolation. Use Value: 3MHz operation minimizes EMI interference in 2.4GHz/5GHz bands; 49°C/W θJA enables operation in thermally constrained module PCBs. |
| Portable Hard Disk Drive (HDD) Logic Board | PDA/Media Player SoC I/O Rail |
Use Scenario: Provides 1.82V to HDD controller ASIC and NAND flash interface logic during spin-up and data transfer phases. IC Role / Device Role / Timing Role: High-efficiency intermediate rail generator between main 5V supply and low-voltage logic domains. Use Value: 600mA capability supports peak current demands during servo write operations; thermal shutdown protects against enclosure overheating. |
Use Scenario: Powers I/O buffers and display interface circuits in handheld media players with 2.7–5.5V battery input. IC Role / Device Role / Timing Role: Compact, fixed-output DC-DC converter eliminating need for external feedback network and trimming. Use Value: 3×3mm MLP footprint fits tight layouts; 16µA quiescent current preserves battery charge during long-duration audio playback pauses. |
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 TPS62231DRVR | 1.8V fixed output, 600mA, 3MHz, but uses external compensation and lacks integrated soft-start; higher 25µA quiescent current. | Requires additional RC network for loop stability; less suitable for space-constrained designs where layout simplicity is critical. | Choose if existing design already uses TI's WEBENCH tools or requires adjustable output via feedback resistors. |
| ROHM BD9A100MUV | 1.8V fixed output, 600mA, 3MHz, but rated only to 85°C ambient (vs. FAN5350MPX's 125°C junction limit); 22µA IQ. | Limited thermal margin in enclosed industrial handhelds; lower efficiency at 1mA load due to higher quiescent draw. | Consider only for cost-sensitive consumer applications with verified ambient <70°C and no requirement for extended temperature validation. |
Compared with TPS62231DRVR and BD9A100MUV, the FAN5350MPX offers superior light-load efficiency (16µA IQ), inherent stability without compensation, and tighter output accuracy (±2.4%), making it optimal for battery-critical portable electronics where layout area and standby power are primary constraints.
Availability
FAN5350MPX is available at Aetrix Electronics and suitable for smartphone power management, WLAN module design, and portable storage systems requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for FAN5350MPX 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 (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The FAN5350MPX belongs to onsemi's high-frequency DC-DC converter product line, engineered specifically for ultra-compact, battery-powered portable electronics demanding minimal board area, low quiescent power, and robust transient response without external compensation.
FAQ
What is the recommended inductor value for FAN5350MPX?
The FAN5350MPX is optimized for a 1µH shielded power inductor rated ≥650mA saturation current and ≤90mΩ DCR. It remains stable with inductors from 0.7µH to 3.0µH, but deviation affects peak current limit, PFM/PWM transition point, and transient response-per Equation 2 and Table 1 in the datasheet. For FAN5350MPX, using 1µH achieves best balance of size, efficiency, and regulation.
Does FAN5350MPX require external feedback resistors?
No, the FAN5350MPX has an internal 1.82V reference and fixed-output configuration-no external feedback resistors are needed. The FB pin connects directly to the output capacitor anode. This simplifies layout, reduces BOM count, and eliminates resistor tolerance errors affecting output accuracy. All FAN5350MPX units deliver 1.82V ±2.4% without adjustment.
What is the maximum allowable PCB trace length between VIN and CIN for FAN5350MPX?
VIN and the 4.7µF input capacitor must be placed within 2mm of each other and connected with wide, low-inductance traces. Longer paths increase switching noise coupling and risk instability or excessive input ripple. The FAN5350MPX datasheet explicitly states "place CIN as close as possible between VIN pin and PGND" - exceeding 2mm degrades EMI performance and may cause startup failure under high di/dt conditions.
How does FAN5350MPX handle load transients from 1mA to 600mA?
The FAN5350MPX delivers exceptional transient response due to its proprietary non-linear control architecture-no traditional feedback loop is required. Load steps from 1mA to 600mA produce <14mV output deviation (Figures 22–23), recovering in <5µs. This is enabled by instantaneous valley-current sensing and direct pulse-width adjustment, making FAN5350MPX ideal for processor core rails with bursty workloads.
Is FAN5350MPX pin-compatible with FAN5350UCX?
No, FAN5350MPX (6-lead MLP) and FAN5350UCX (5-bump WLCSP) have fundamentally different packages, pin counts, and pinouts. FAN5350MPX uses pins 1–6 (PGND, AGND, FB, EN, SW, VIN); FAN5350UCX uses bumps A1, A3, C1, C3, B2 (VIN, GND, EN, FB, SW). They are functionally identical but not mechanically or electrically interchangeable-PCB redesign is required for substitution.
FAN5350MPX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 6-WDFN Exposed Pad
- 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):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.82V
- Voltage - Output (Max):
- -
- Current - Output:
- 600mA
- Frequency - Switching:
- 3MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-MLP (3x3)
FAN5350MPX FAQ
1.How can I place an order for FAN5350MPX through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN5350MPX 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 FAN5350MPX reliable?
The price and inventory of FAN5350MPX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN5350MPX is usually 5 days.
3.What payment methods are accepted for FAN5350MPX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN5350MPX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN5350MPX?
FAN5350MPX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN5350MPX 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 FAN5350MPX?
For technical support, including FAN5350MPX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN5350MPX requirements.
6.How does Aetrix verify that FAN5350MPX is sourced from the original manufacturer or authorized distributors?
All FAN5350MPX 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 FAN5350MPX meets industry standards.
7.What is the process for return or replacement of FAN5350MPX?
All FAN5350MPX units undergo pre-shipment inspection (PSI). If there is an issue with FAN5350MPX, 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 FAN5350MPX part is unused and in its original packaging.
Return procedure for FAN5350MPX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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