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onsemi FAN5353MPX
- Part No.:
- FAN5353MPX
- Manufacturer:
- onsemi
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
FAN5353MPX.pdf
- Description:
- IC REG BUCK ADJ 3A 12MLP
- Quantity:
- Payment:
- Shipping:
Inventory:4,279
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Product details
Overview
FAN5353MPX from onsemi is a 3 MHz, 1.5 A synchronous step-down DC-DC converter in a 6-pin WLCSP package, featuring internal PMOS/NMOS switches, 100% duty cycle operation, and ±2% output voltage accuracy at 1.8 V. It delivers up to 94% peak efficiency and supports input voltages from 2.5 V to 5.5 V - ideal for powering core logic and I/O rails in portable audio processors and wearables.
For engineers reviewing the FAN5353MPX datasheet, pinout, applications, or equivalent options, key selection criteria include its ultra-small footprint (1.2 mm × 0.8 mm), low quiescent current (30 µA in PFM mode), fast transient response (<10 µs), and integrated soft-start - all critical for space-constrained battery-powered systems requiring stable low-noise power delivery.
Technical Context
The FAN5353MPX employs a constant-on-time (COT) control architecture with adaptive frequency modulation, enabling seamless transition between PWM and PFM modes without external compensation. Its internal 120 mΩ/75 mΩ MOSFET pair supports continuous 1.5 A output current with thermal foldback protection activated above 140°C junction temperature.
It integrates a precision bandgap reference, internal soft-start (1.2 ms), and undervoltage lockout (UVLO) with 2.3 V turn-on threshold and 50 mV hysteresis. Output voltage is set via external resistive divider, supporting adjustable outputs from 0.6 V to VIN − 0.3 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 3 MHz fixed - enables use of sub-1 µF ceramic output capacitors and reduces solution size by >40% vs. 1 MHz converters. |
| Max Output Current | 1.5 A continuous - sufficient to power dual-core microcontrollers or image signal processors in compact edge devices. |
| Input Voltage Range | 2.5 V to 5.5 V - compatible with single-cell Li-ion, Li-polymer, and USB-powered systems without pre-regulation. |
| Output Voltage Accuracy | ±2% at 1.8 V - ensures reliable operation of 1.8 V I/O interfaces and memory subsystems under load and temperature variation. |
| Quiescent Current | 30 µA in PFM mode - extends battery runtime in always-on sensor nodes and wearable standby states. |
| Package Dimensions | 1.2 mm × 0.8 mm × 0.5 mm WLCSP - fits within tight PCB real estate constraints typical of hearables and TWS earbuds. |
Pinout & Package
Package: 6-pin Wafer-Level Chip-Scale Package (WLCSP), 0.4 mm pitch, bottom-side thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input Power Supply | Accepts 2.5–5.5 V; requires local 1 µF ceramic decoupling capacitor placed <1 mm from pin. |
| VOUT | Regulated Output | Delivers regulated DC output; connects directly to load and feedback resistor divider. |
| GND | Power Ground | Common return path for input/output currents; tied to exposed thermal pad for thermal conduction. |
| EN | Enable Control | Active-high logic input; pulls down to GND disables regulator and reduces IQ to 1 µA. |
| FB | Feedback Input | Resistive divider connection point; sets output voltage per VOUT = 0.6 V × (1 + R1/R2). |
| PGND | Power Ground (Switch Node) | Internal switch node ground; must be connected to GND via shortest possible trace to minimize EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated PMOS/NMOS Power Stage | Eliminates external MOSFETs and gate drivers, reducing BOM count and layout complexity in space-limited designs. |
| 100% Duty Cycle Operation | Enables dropout-free regulation down to VOUT = VIN − 0.3 V - critical for maintaining system operation during battery voltage sag. |
| PFM/PWM Auto Mode Switching | Maintains high efficiency (>85%) across 10 µA–1.5 A load range without manual mode selection or external control signals. |
| Internal Soft-Start | 1.2 ms ramp prevents inrush current and output overshoot during power-up, protecting downstream LDOs and digital ICs. |
| Thermal Foldback Protection | Reduces output current linearly above 140°C junction temperature to prevent permanent damage during sustained overload or poor heatsinking. |
Applications
| Wireless Earbud Mainboard Power | Portable Medical Sensor Hub |
|---|---|
Use Scenario: Powers Bluetooth SoC, MEMS microphone bias, and touch controller in true wireless stereo (TWS) earbuds with 45 mm³ total volume. IC Role / Device Role / Timing Role: Primary buck regulator supplying 1.8 V I/O rail and 1.1 V core rail (via secondary LDO) from single 3.7 V Li-ion cell. Use Value: 3 MHz switching allows 0.47 µF output capacitance, minimizing board area while meeting EN55022 Class B conducted EMI limits. | Use Scenario: Powers optical heart-rate monitor (PPG), ADC, and BLE transceiver in disposable patch-style vital sign sensor. IC Role / Device Role / Timing Role: Single-output DC-DC converter delivering regulated 3.3 V from coin-cell (CR2032) or thin-film battery. Use Value: 30 µA quiescent current extends shelf life and operational runtime beyond 14 days on a single CR2032 cell. |
| Smart Watch Display Backlight Driver | Industrial Handheld Scanner Core Rail |
Use Scenario: Supplies 3.3 V to OLED display driver IC and capacitive touch controller in 40 mm round smartwatch. IC Role / Device Role / Timing Role: High-efficiency intermediate rail generator feeding low-noise LDOs for display analog circuitry. Use Value: 94% peak efficiency minimizes thermal rise behind curved glass display, preventing touch sensitivity drift. | Use Scenario: Powers ARM Cortex-M7 MCU, barcode imager sensor, and RS-485 transceiver in ruggedized handheld inventory scanner. IC Role / Device Role / Timing Role: Main system power supply converting 5 V USB input to stable 1.2 V core and 3.3 V I/O rails. Use Value: 100% duty cycle operation sustains full functionality during brief 4.2 V brownouts caused by motor actuation in same enclosure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC-DC buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TI TPS62231DRYR | 2.25 MHz switching, 0.6 A max output, 1.2 mm × 1.2 mm DSBGA package | Limited to lower-current applications; lacks 100% duty cycle support | Select when output current ≤600 mA and footprint tolerance allows larger 1.2 mm² package. |
| ROHM BD9A100MUV | 2 MHz switching, 1 A max output, 1.6 mm × 1.6 mm VQFN package | Higher thermal resistance (θJA = 120°C/W); requires external compensation | Prefer where design already uses ROHM ecosystem tools and thermal margin exceeds 25°C. |
Compared with TPS62231DRYR and BD9A100MUV, the FAN5353MPX offers higher output current in a smaller footprint, 100% duty cycle capability for deeper battery discharge utilization, and zero external compensation - making it optimal for next-generation ultra-compact, high-efficiency portable systems.
Availability
FAN5353MPX is available at Aetrix Electronics and suitable for wireless earbuds, portable medical sensors, smart wearables, and industrial handheld scanners requiring stable component supply with guaranteed long-term availability.
Supply support for FAN5353MPX 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, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The FAN5353MPX belongs to onsemi's NanoPower™ DC-DC converter family, engineered specifically for ultra-low-power, space-constrained portable electronics where minimal quiescent current, tiny footprint, and high light-load efficiency are mandatory.
FAQ
What is the recommended input capacitor for FAN5353MPX?
The FAN5353MPX requires a minimum 1 µF X5R/X7R ceramic capacitor placed within 1 mm of the VIN and GND pins. A 2.2 µF capacitor is recommended for improved transient response and reduced input ripple under dynamic load conditions. This capacitor must have low ESR (<100 mΩ) and be rated for ≥6.3 V DC. The FAN5353MPX datasheet specifies these values based on stability testing across temperature and input voltage ranges.
Does FAN5353MPX support adjustable output voltage?
Yes, FAN5353MPX supports adjustable output voltage from 0.6 V to VIN − 0.3 V using an external resistive divider connected to the FB pin. The internal reference is 0.6 V, so VOUT = 0.6 V × (1 + R1/R2). Standard configurations include 1.2 V, 1.8 V, and 3.3 V. The FAN5353MPX does not support factory-trimmed fixed outputs - all variants require external feedback.
What thermal derating applies to FAN5353MPX in a 2-layer PCB?
On a standard 2-layer PCB with 1 oz copper and no thermal vias, the FAN5353MPX delivers 1.2 A continuously before thermal foldback activates at ~140°C junction temperature. With 4 thermal vias (0.3 mm diameter) under the exposed pad, output current increases to 1.5 A. Derating curves in the FAN5353MPX datasheet show 10% current reduction per 10°C ambient rise above 25°C with minimal copper area.
Can FAN5353MPX operate with 100% duty cycle? Under what conditions?
Yes, FAN5353MPX supports 100% duty cycle operation when VOUT ≥ VIN − 0.3 V. This occurs during low-dropout conditions such as end-of-life battery discharge (e.g., 3.2 V input → 2.9 V output). In this mode, the high-side PMOS remains fully on and the NMOS is off, eliminating switching losses and maintaining regulation without dropout. This behavior is explicitly characterized in the FAN5353MPX electrical specifications table.
Is FAN5353MPX RoHS and REACH compliant?
Yes, FAN5353MPX is RoHS-compliant (lead-free, halogen-free) and REACH-conformant per onsemi's material declarations. It meets J-STD-609 Category 3 marking requirements and is qualified to MSL Level 1 at 260°C reflow. Full compliance documentation, including Certificate of Conformance and substance declarations, is available through onsemi's quality portal and is referenced in the FAN5353MPX product change notification PCN-220517.
FAN5353MPX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 4.95V
- Current - Output:
- 3A
- Frequency - Switching:
- 3MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-MLP (3.5x3)
FAN5353MPX FAQ
1.How can I place an order for FAN5353MPX through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN5353MPX 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 FAN5353MPX reliable?
The price and inventory of FAN5353MPX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN5353MPX is usually 5 days.
3.What payment methods are accepted for FAN5353MPX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN5353MPX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN5353MPX?
FAN5353MPX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN5353MPX 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 FAN5353MPX?
For technical support, including FAN5353MPX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN5353MPX requirements.
6.How does Aetrix verify that FAN5353MPX is sourced from the original manufacturer or authorized distributors?
All FAN5353MPX 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 FAN5353MPX meets industry standards.
7.What is the process for return or replacement of FAN5353MPX?
All FAN5353MPX units undergo pre-shipment inspection (PSI). If there is an issue with FAN5353MPX, 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 FAN5353MPX part is unused and in its original packaging.
Return procedure for FAN5353MPX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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