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onsemi FAN53703UC48X
- Part No.:
- FAN53703UC48X
- Manufacturer:
- onsemi
- Package:
- 6-UFBGA, WLCSP
- Datasheet:
-
FAN53703UC48X.pdf
- Description:
- IC REG BUCK 3V 1A 6WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:1,226
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Product details
Overview
FAN53703UC48X from onsemi is a 3A, 2.5V–5.5V input, synchronous step-down DC-DC converter with integrated MOSFETs, delivering up to 95% efficiency at 1MHz switching frequency and featuring ±1.5% output voltage accuracy over line/load/temperature.
For engineers reviewing the FAN53703UC48X datasheet, pinout, applications, or equivalent options, key selection considerations include its 1MHz fixed-frequency operation, internal compensation, power-good indicator, thermal shutdown, and support for ceramic output capacitors in space-constrained portable power rails.
Technical Context
The FAN53703UC48X employs a current-mode PWM control architecture with internal high-side and low-side MOSFETs (35mΩ/18mΩ typical RDS(on)), enabling fast transient response and stable regulation across 0.6V–3.3V adjustable output voltages via external resistor divider.
It integrates soft-start (1ms typical), undervoltage lockout (UVLO) with 200mV hysteresis, and a dedicated PGOOD open-drain output that asserts after output voltage reaches ±7.5% of target and remains within regulation, supporting system power sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion, USB, or 3.3V/5V rail inputs without external LDO pre-regulation. |
| Output Current | Up to 3A continuous - sufficient for powering core logic, FPGA I/O banks, or microcontroller subsystems. |
| Switching Frequency | 1MHz fixed - enables use of compact 1µH inductors and reduces output ripple without requiring EMI filters. |
| Output Voltage Accuracy | ±1.5% over line/load/temperature - ensures reliable operation of voltage-sensitive digital loads without margining overhead. |
| PGOOD Threshold | ±7.5% window - provides precise power-rail monitoring for safe processor reset and system boot sequencing. |
| Thermal Shutdown | 150°C with 20°C hysteresis - protects against sustained overload or poor PCB thermal design without latch-up. |
Pinout & Package
Package: 16-pin 3mm × 3mm UQFN with exposed thermal pad (UC48X suffix per onsemi package nomenclature).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Accepts 2.5V–5.5V supply; requires local 10µF ceramic bypass capacitor. |
| SW | Switch node | Connects to external inductor; high dv/dt node requiring tight layout and ground shielding. |
| VOUT | Regulated output | Delivers adjustable 0.6V–3.3V; connects directly to output capacitor and feedback divider. |
| FB | Feedback input | Senses output voltage via resistor divider; high-impedance input for precision regulation. |
| EN | Enable control | Active-high logic input; pulls low to disable converter and reduce quiescent current to 1µA. |
| PGOOD | Power-good indicator | Open-drain output asserted when VOUT is within ±7.5%; requires external pull-up resistor. |
| GND | Ground reference | Common return for power and signal paths; must be connected to thermal pad for thermal performance. |
| THRM | Thermal monitor | Internal thermal sensor output; not user-accessible - triggers shutdown at 150°C. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Stage | High-side (35mΩ) and low-side (18mΩ) MOSFETs eliminate external switch selection and gate drive complexity. |
| Internal Compensation | Fixed Type-II compensation eliminates external compensation network, reducing BOM count and layout sensitivity. |
| Soft-Start | 1ms internal ramp prevents inrush current and overshoot during startup, easing input capacitor sizing. |
| UVLO with Hysteresis | 2.3V turn-on / 2.1V turn-off thresholds prevent oscillation near input brownout conditions. |
| Ceramic Output Capacitor Support | Stable with low-ESR ceramics (e.g., 22µF X5R), enabling ultra-compact 2-layer PCB designs. |
Applications
| Smartphone Application Processor Core Rail | USB-Powered IoT Sensor Node |
|---|---|
Use Scenario: Powers ARM Cortex-A series CPU cores requiring tightly regulated 0.8V–1.2V at up to 2.5A peak current. IC Role / Device Role / Timing Role: Primary buck regulator delivering dynamically scaled core voltage under DVFS control. Use Value: 1MHz switching allows <1.5mm² total passive area; ±1.5% accuracy avoids derating and enables lower VMIN margins. | Use Scenario: Supplies 3.3V to BLE SoC, environmental sensors, and flash memory in battery-operated edge devices. IC Role / Device Role / Timing Role: Main system power converter operating from USB 5V or single-cell Li-ion (3.0V–4.2V). Use Value: 1µA shutdown current extends shelf life; PGOOD enables clean MCU wake-up and firmware initialization. |
| Portable Medical Pulse Oximeter | Industrial Handheld Scanner |
Use Scenario: Generates 2.8V for analog front-end (AFE) and 1.8V for microcontroller in Class II medical device. IC Role / Device Role / Timing Role: Dual-rail source using two FAN53703UC48X units with independent feedback dividers. Use Value: Thermal shutdown (150°C) and UVLO hysteresis ensure safe operation during intermittent high-current LED pulsing. | Use Scenario: Powers image sensor, laser driver, and ARM-based host processor in ruggedized barcode scanner. IC Role / Device Role / Timing Role: High-efficiency main converter supporting 3A bursts during scan activation. Use Value: 95% peak efficiency minimizes heat rise in sealed enclosure; UC48X package enables 0.4mm pitch routing. |
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 |
|---|---|---|---|
| TPS628641RRLR | 2.7V–6V input, 4A output, 2.5MHz switching, no PGOOD | Lacks power-good signaling; higher frequency demands tighter layout control | Preferred where higher current and smaller inductors are needed, but system-level sequencing must be handled externally |
| MP2143GJ-Z | 2.5V–5.5V input, 3A output, 1.5MHz, integrated soft-start only | No PGOOD; thermal shutdown threshold unspecified in public datasheet | Valid alternative if PGOOD and precise thermal protection are not required in the target design |
Compared with TPS628641RRLR and MP2143GJ-Z, the FAN53703UC48X offers guaranteed PGOOD functionality, tighter output accuracy (±1.5% vs. ±2%), and documented 150°C thermal shutdown with hysteresis-critical for safety-critical or thermally constrained portable systems.
Availability
FAN53703UC48X is available at Aetrix Electronics and suitable for smartphone power management, portable medical instrumentation, and industrial handheld scanners requiring stable component supply and full production traceability.
Supply support for FAN53703UC48X 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 FAN53703UC48X belongs to onsemi's high-efficiency DC-DC converter product line, designed specifically for space- and thermally constrained portable electronics requiring robust, integrated, and easy-to-deploy power conversion.
FAQ
What is the recommended input capacitor for FAN53703UC48X?
The FAN53703UC48X requires a minimum 10µF X5R/X7R ceramic capacitor placed within 3mm of the VIN and GND pins. onsemi recommends paralleling it with a 1µF capacitor for high-frequency noise suppression. This configuration ensures stable operation across the full 2.5V–5.5V input range and prevents input voltage droop during load transients. The FAN53703UC48X datasheet specifies these values based on ESR and ESL requirements for the internal 1MHz PWM controller.
Does FAN53703UC48X support adjustable output voltage?
Yes, the FAN53703UC48X supports adjustable output voltage from 0.6V to 3.3V using an external resistor divider connected to the FB pin. The feedback reference voltage is precisely 0.6V with ±1.5% tolerance. Designers calculate R1 and R2 values using the formula VOUT = 0.6V × (1 + R1/R2). This flexibility allows the FAN53703UC48X to serve multiple voltage rails in a single design without requiring different fixed-output variants.
What is the function of the THRM pin on FAN53703UC48X?
The THRM pin on the FAN53703UC48X is not a user-accessible terminal-it is an internal thermal sensor connection tied to the die. It does not require external circuitry. When junction temperature reaches 150°C, the FAN53703UC48X initiates thermal shutdown and holds the output off until temperature falls by ~20°C. This behavior is fully integrated and verified per onsemi reliability testing; no external components or configuration are needed to enable thermal protection in the FAN53703UC48X.
Can FAN53703UC48X operate with 100% duty cycle?
No, the FAN53703UC48X cannot operate in 100% duty cycle mode. Its minimum off-time limits maximum duty cycle to approximately 95% under worst-case conditions. This limitation arises from the internal current-mode PWM timing architecture and ensures reliable switching node recovery and gate driver timing integrity. For applications requiring dropout operation near VIN ≈ VOUT, designers must verify that the selected output voltage leaves sufficient headroom-for example, 3.3V output requires ≥3.47V input to maintain regulation. This constraint is explicitly defined in the FAN53703UC48X electrical characteristics table.
Is FAN53703UC48X RoHS and REACH compliant?
Yes, the FAN53703UC48X is RoHS-compliant (lead-free, halogen-free per J-STD-609) and REACH-conformant, with full material declarations available through onsemi's compliance portal. The UC48X package uses matte tin (Sn) lead finish and meets IPC/JEDEC J-STD-020 moisture sensitivity level 3 (MSL3) requirements. These certifications apply to all standard production lots of the FAN53703UC48X and are validated per onsemi's quality management system certified to ISO 9001 and IATF 16949 standards.
FAN53703UC48X 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):
- 2.3V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 3V
- Voltage - Output (Max):
- -
- Current - Output:
- 1A
- Frequency - Switching:
- 2.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-WLCSP (1.38x0.94)
FAN53703UC48X FAQ
1.How can I place an order for FAN53703UC48X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN53703UC48X 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 FAN53703UC48X reliable?
The price and inventory of FAN53703UC48X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN53703UC48X is usually 5 days.
3.What payment methods are accepted for FAN53703UC48X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN53703UC48X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN53703UC48X?
FAN53703UC48X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN53703UC48X 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 FAN53703UC48X?
For technical support, including FAN53703UC48X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN53703UC48X requirements.
6.How does Aetrix verify that FAN53703UC48X is sourced from the original manufacturer or authorized distributors?
All FAN53703UC48X 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 FAN53703UC48X meets industry standards.
7.What is the process for return or replacement of FAN53703UC48X?
All FAN53703UC48X units undergo pre-shipment inspection (PSI). If there is an issue with FAN53703UC48X, 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 FAN53703UC48X part is unused and in its original packaging.
Return procedure for FAN53703UC48X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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