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onsemi FAN5358S710X
- Part No.:
- FAN5358S710X
- Manufacturer:
- onsemi
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
FAN5358S710X.pdf
- Description:
- IC REG BUCK 1V 500MA SC88
- Quantity:
- Payment:
- Shipping:
Inventory:2,071
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Product details
Overview
FAN5358S710X from ON Semiconductor is a fixed-output 1.0V, 500mA synchronous buck regulator in SC70-6 package, operating at 2MHz with 25µA quiescent current and 2.7V–5.5V input range - designed for power management in space-constrained mobile baseband processors and RF transceivers.
For engineers reviewing the FAN5358S710X datasheet, pinout, applications, or equivalent options, key selection criteria include its PFM/PWM hybrid control architecture, integrated soft-start and UVLO, thermal shutdown at 150°C, and compatibility with low-ESR ceramic capacitors for ultra-thin portable designs.
Technical Context
The FAN5358S710X employs a proprietary quasi-fixed-frequency PWM modulator with discontinuous conduction mode (DCM) PFM operation at light loads, enabling seamless transition between modes without output voltage glitch. Its synchronous rectification uses internal PMOS/NMOS switches with RDS(on) of 750mΩ/650mΩ to sustain >80% efficiency down to 1mA load.
Control is fully integrated: EN pin enables shutdown with <1µA supply current; internal soft-start ramps VOUT over 70µs; under-voltage lockout activates at 2.4V (225mV hysteresis); and peak current limiting triggers at 750–1150mA before thermal shutdown engages at 150°C with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.0V ±4.5% - ensures stable core supply for ARM-based application processors without external feedback network. |
| Switching Frequency | 2MHz nominal - allows use of compact 2.2µH inductor and 4.7µF ceramic output capacitor, minimizing PCB footprint. |
| Quiescent Current | 25µA typical in PFM mode - extends battery life in always-on subsystems such as cellular modem standby or sensor hubs. |
| Input Voltage Range | 2.7V to 5.5V - supports direct connection to single-cell Li-ion (3.0–4.2V), USB 5V, or boosted 3.3V rails. |
| Output Current | 500mA continuous - sufficient for powering DDR I/O, GPU cores, or RF front-end ICs in smartphones and data cards. |
| Thermal Shutdown | 150°C junction temperature with 20°C hysteresis - prevents permanent damage during sustained overload or poor PCB thermal design. |
| Enable Threshold | VENH = 1.2V, VENL = 0.4V - compatible with standard GPIO logic levels and supports precise sequencing in multi-rail systems. |
Pinout & Package
Package: SC70-6 (EIAJ SC-88A), 2.0mm × 2.2mm × 0.9mm body, 0.65mm pitch, thermally enhanced with exposed pad not present - requires standard reflow profile per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SW | Switching node | Connects directly to inductor; carries high di/dt pulsed current - must be routed with minimal loop area to reduce EMI. |
| 2,5 - GND | Power and signal ground | Dual ground pins provide low-impedance return path for both power and control circuits - connect to solid ground plane. |
| 3 - VOUT | Output voltage / feedback | Direct connection to output capacitor; no external resistor divider needed due to fixed 1.0V regulation. |
| 4 - EN | Enable control input | Active-high logic interface; must be pulled high (>1.2V) to operate, pulled low (<0.4V) for shutdown - avoid floating. |
| 6 - VIN | Input power supply | Accepts 2.7–5.5V; requires 2.2µF ceramic capacitor placed within 2mm of this pin and GND for stable operation. |
Key Features
| Feature | Design Value |
|---|---|
| PFM/PWM hybrid mode | Maintains >80% efficiency from 1mA to 500mA load - eliminates need for external mode-select circuitry in battery-powered devices. |
| Internal soft-start | 70µs monotonic ramp - prevents inrush current into downstream capacitance and avoids system reset during power-up. |
| UVLO with hysteresis | 2.4V turn-on threshold + 225mV hysteresis - ensures clean startup from brown-out conditions and prevents oscillation near dropout. |
| Synchronous MOSFETs | 750mΩ PMOS / 650mΩ NMOS - eliminates external Schottky diode, reduces conduction loss, and improves light-load efficiency. |
| Thermal & current protection | Auto-restart thermal shutdown + cycle-by-cycle current limit - protects against short-circuit, overload, and PCB thermal failure without external components. |
Applications
| Mobile Baseband Processor Core Supply | RF Transceiver Bias Rail |
|---|---|
|
Use Scenario: Powering ARM Cortex-A series CPU cores in LTE smartphones requiring tightly regulated 1.0V at up to 500mA with fast transient response. IC Role / Device Role / Timing Role: Primary DC-DC converter delivering stable core voltage; operates in PFM during idle, PWM during burst activity. Use Value: 25µA quiescent current extends standby time; 2MHz switching minimizes inductor size for thin bezel designs. |
Use Scenario: Supplying bias voltage to LTE/WiFi RF power amplifiers and LNAs where low noise and fast load step recovery are critical. IC Role / Device Role / Timing Role: Low-noise, high-PSRR point-of-load regulator; maintains regulation during 200mA load steps in <5µs. Use Value: Synchronous architecture and ceramic-compatible design suppress output ripple to <15mVPP, preserving RF signal integrity. |
| USB-Powered Data Card Module | Ultra-Mobile PC Memory I/O Rail |
|
Use Scenario: Regulating 5V USB input to 1.0V for NAND flash controller and PCIe bridge ICs in portable 4G/LTE data cards. IC Role / Device Role / Timing Role: Input-stage buck converter; handles wide VIN variation (4.75–5.25V) while maintaining ±4.5% VOUT accuracy. Use Value: 2.7–5.5V input range accepts full USB tolerance; thermal shutdown prevents overheating in sealed plastic enclosures. |
Use Scenario: Providing 1.0V DDR3/DDR4 I/O supply in fanless netbooks where thermal headroom is limited and board space is constrained. IC Role / Device Role / Timing Role: Compact, thermally robust point-of-load regulator; delivers 500mA with junction temperature held below 125°C on 2-layer PCB. Use Value: SC70-6 footprint (2.0×2.2mm) saves >60% area vs. SOT-23; 285°C/W θJA enables reliable operation without heatsink. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | 1.0V fixed, 600mA, 3MHz, 17µA IQ, WSON-6 (2×2mm) | Higher frequency enables smaller inductors but increases EMI sensitivity; lacks PFM mode hysteresis control. | Preferred when board space is tighter and EMI filtering is already implemented; verify thermal performance at 500mA in same layout. |
| RT8059ZSP | 1.0V fixed, 600mA, 2MHz, 30µA IQ, SOT-23-6 | Larger SOT-23-6 package (2.9×2.8mm) and higher θJA (320°C/W) limits max ambient temperature at full load. | Acceptable for cost-sensitive designs with relaxed thermal requirements; requires larger PCB area and may need additional thermal vias. |
Compared with TPS62231DRYR and RT8059ZSP, the FAN5358S710X offers superior light-load efficiency via optimized PFM entry/exit behavior and lower thermal resistance in its SC70-6 package - making it better suited for thermally constrained, battery-operated handhelds where standby duration and peak power density matter.
Availability
FAN5358S710X is available at Aetrix Electronics and suitable for mobile baseband power, RF transceiver bias, USB data card modules, ultra-mobile PC memory rails, and other applications requiring stable component supply with guaranteed long-term sourcing.
Supply support for FAN5358S710X 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, sensing, and connectivity solutions for automotive, industrial, cloud, and mobile markets.
The FAN5358S710X belongs to Fairchild's legacy high-frequency synchronous buck regulator product line - acquired by ON Semiconductor - engineered specifically for compact, high-efficiency power delivery in portable wireless devices.
FAQ
What is the output voltage tolerance of the FAN5358S710X over full load and temperature range?
The FAN5358S710X provides a fixed 1.0V output with ±4.5% accuracy across 0–500mA load and –40°C to +85°C ambient temperature. This specification is verified per the Electrical Characteristics table in the official datasheet Rev. 1.0.3, ensuring consistent core voltage delivery for sensitive digital ICs without external trimming.
Does the FAN5358S710X require an external feedback resistor network?
No, the FAN5358S710X does not require external feedback resistors. It is a fixed-output device with internally trimmed 1.0V regulation - pin 3 (VOUT) serves as both output and feedback node. This simplifies layout, reduces BOM count, and eliminates resistor tolerance errors affecting output accuracy.
Can the FAN5358S710X operate with a 2.2µH inductor and 4.7µF output capacitor as specified in the typical application?
Yes, the FAN5358S710X is fully characterized and optimized for use with a 2.2µH inductor and 4.7µF ceramic output capacitor, as shown in Figure 1 and Table 1 of the datasheet. These values ensure stable operation, optimal transient response, and compliance with ripple and efficiency specifications across the full operating range.
What happens to the FAN5358S710X during a short-circuit event at the output?
During a VOUT-to-GND short, the FAN5358S710X activates cycle-by-cycle current limiting and enters thermal shutdown if junction temperature exceeds 150°C. After cooling by 20°C, it auto-restarts. Under sustained short, it cycles between shutdown and restart - dissipating <100mW internally to prevent damage.
Is the FAN5358S710X pin-compatible with other variants in the FAN5358 family, such as FAN5358S712X?
Yes, all FAN5358 variants including FAN5358S710X, FAN5358S712X, FAN5358S713X, and FAN5358S718X share identical SC70-6 pinout, electrical interface, and thermal characteristics - only the fixed output voltage differs. This enables drop-in replacement during design iteration or voltage binning without PCB changes.
FAN5358S710X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 6-TSSOP, SC-88, SOT-363
- 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):
- 1V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-88 (SC-70-6)
FAN5358S710X FAQ
1.How can I place an order for FAN5358S710X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN5358S710X 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 FAN5358S710X reliable?
The price and inventory of FAN5358S710X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN5358S710X is usually 5 days.
3.What payment methods are accepted for FAN5358S710X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN5358S710X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN5358S710X?
FAN5358S710X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN5358S710X 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 FAN5358S710X?
For technical support, including FAN5358S710X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN5358S710X requirements.
6.How does Aetrix verify that FAN5358S710X is sourced from the original manufacturer or authorized distributors?
All FAN5358S710X 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 FAN5358S710X meets industry standards.
7.What is the process for return or replacement of FAN5358S710X?
All FAN5358S710X units undergo pre-shipment inspection (PSI). If there is an issue with FAN5358S710X, 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 FAN5358S710X part is unused and in its original packaging.
Return procedure for FAN5358S710X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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