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onsemi FAN5358S718X
- Part No.:
- FAN5358S718X
- Manufacturer:
- onsemi
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
FAN5358S718X.pdf
- Description:
- IC REG BUCK 1.8V 500MA SC88
- Quantity:
- Payment:
- Shipping:
Inventory:3,301
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Product details
Overview
FAN5358S718X from ON Semiconductor is a fixed-output 1.8V, 500mA synchronous buck regulator in SC70-6 package, operating at 2MHz with 25µA quiescent current and input range 2.7–5.5V. It delivers high efficiency (>80% at 1mA load) for power rails in mobile baseband processors and RF transceivers.
For engineers reviewing the FAN5358S718X datasheet, pinout, applications, or equivalent options, key selection criteria include fixed 1.8V output accuracy (±4.0%), integrated soft-start, UVLO threshold (2.4–2.6V), thermal shutdown (150°C), and PFM/PWM mode transition behavior under light-load conditions.
Technical Context
The FAN5358S718X uses a proprietary quasi-fixed-frequency PWM modulator with synchronous rectification to achieve fast transient response independent of output capacitor ESR. Its control scheme enables seamless PWM-to-PFM mode transition without VOUT glitch, supporting ceramic capacitors down to 4.7µF.
It integrates PMOS/NMOS power switches with RDS(on) of 750mΩ and 650mΩ respectively, peak current limit of 750–1150mA, and internal soft-start with 70µs ramp time. Protection includes input UVLO (2.4–2.6V, 225mV hysteresis), thermal shutdown (150°C, 20°C hysteresis), and overload recovery with auto-restart.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±4.0% over 0–500mA load and -40°C to +85°C ambient - ensures stable core voltage for 1.8V I/O or logic rails. |
| Switching Frequency | 2MHz nominal in PWM mode - enables use of small 2.2µH inductor and 4.7µF ceramic output capacitor, reducing board area. |
| Quiescent Current | 25µA typical in light-load PFM mode - extends battery life in standby states of portable devices. |
| Input Voltage Range | 2.7V to 5.5V - compatible with single-cell Li-ion (3.0–4.2V), Li-polymer, or regulated 3.3V/5V system rails. |
| Output Current | 500mA continuous - sufficient for powering ARM Cortex-A/M cores, DDR I/O, or RF front-end bias circuits. |
| Enable Threshold | VENH = 1.2V, VENL = 0.4V - supports direct interfacing with 1.8V GPIO without level-shifting. |
| Thermal Shutdown | Activates at 150°C junction temperature with 20°C hysteresis - prevents permanent damage during sustained overload or poor PCB thermal design. |
Pinout & Package
Package: SC70-6 (EIAJ SC-88A), 2.00mm × 2.20mm × 0.95mm body, 0.65mm pitch, thermally enhanced with exposed pad not present - requires standard reflow profile per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switching Node | Connects to inductor; carries high di/dt switching current - must be routed with minimal loop area to reduce EMI. |
| 2,5 (GND) | Power & IC Ground | Dual ground pins reduce impedance path for return currents; both must connect to low-inductance ground plane. |
| 3 (VOUT) | Output Voltage / Feedback | Direct connection to output capacitor; senses regulated 1.8V - no external resistor divider required. |
| 4 (EN) | Enable Input | Active-high digital control; <0.4V = shutdown (<1µA ISD), >1.2V = active - must not float. |
| 6 (VIN) | Input Supply | Accepts 2.7–5.5V; requires 2.2µF ceramic capacitor placed adjacent to pin to suppress high-frequency noise. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Rectification | Eliminates external Schottky diode, improving efficiency by ~10% at 100mA and enabling full 500mA output without thermal derating. |
| PFM Mode at Light Load | Maintains 25µA quiescent current while delivering <1mA output - critical for always-on sensor or RTC power domains. |
| Internal Soft-Start | 70µs controlled voltage ramp prevents inrush current into output capacitance - avoids input rail droop during power-up. |
| UVLO with Hysteresis | 2.4V turn-on / 2.175V turn-off ensures clean startup from weak batteries and prevents oscillation near brownout thresholds. |
| Thermal Auto-Restart | Shuts down at 150°C, cools, then attempts restart after ~275µs - protects against sustained short-circuit without requiring external reset circuitry. |
Applications
| Mobile Baseband Processor Core Rail | RF Transceiver Bias Supply |
|---|---|
|
Use Scenario: Powers ARM-based application processor core (e.g., Qualcomm Snapdragon S4) requiring tightly regulated 1.8V at up to 400mA during burst activity. IC Role / Device Role / Timing Role: Primary DC-DC converter providing main core voltage with fast transient response to handle CPU frequency scaling events. Use Value: Maintains >85% efficiency across 1–500mA load range and exhibits <15mV undershoot during 0→300mA 1µs load step - prevents processor reset or timing violation. |
Use Scenario: Supplies bias voltage to LTE/WiFi RF power amplifier stages in smartphones and data cards. IC Role / Device Role / Timing Role: Low-noise, high-PSRR point-of-load regulator isolating sensitive RF circuitry from noisy digital supply rails. Use Value: Achieves >50dB PSRR at 100kHz and <20mVPP output ripple at 200mA - preserves EVM and ACLR performance in 4G transmission. |
| Ultra-Mobile PC Memory I/O Rail | Smartphone Camera Module Power |
|
Use Scenario: Delivers 1.8V to LPDDR2/LPDDR3 memory interfaces in netbooks and tablets where space and thermal budget are constrained. IC Role / Device Role / Timing Role: Compact, high-efficiency buck converter replacing larger inductor-based solutions to meet thin-profile mechanical requirements. Use Value: SC70-6 footprint (2.0×2.2mm) saves >40% board area vs. comparable SOIC-8 regulators, while sustaining 500mA at +85°C ambient. |
Use Scenario: Powers image signal processor (ISP) and CMOS sensor analog blocks in dual-camera smartphone modules. IC Role / Device Role / Timing Role: Dedicated low-noise supply enabling clean analog signal chain operation during high-resolution capture sequences. Use Value: PFM mode reduces idle power to <10µW, extending battery life between photo sessions; soft-start prevents sensor initialization faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | 1.8V fixed, 600mA, 3MHz, 17µA IQ, WSON-6 (2.0×2.0mm) | Higher switching frequency allows smaller inductor (1.0µH); tighter output accuracy (±1.5%) but no UVLO hysteresis spec. | Preferred when board space is more constrained than thermal margin, and higher precision is required for low-voltage logic rails. |
| RT8059ZSP | 1.8V fixed, 500mA, 2MHz, 30µA IQ, TSOT-23-6 (2.9×1.6mm) | Larger footprint and lower thermal resistance (θJA = 220°C/W); lacks PFM/PWM seamless transition - exhibits minor VOUT glitch. | Chosen when higher thermal robustness is needed in high-ambient environments, accepting slightly larger layout area. |
Compared with FAN5358S718X, TPS62231DRYR offers superior light-load efficiency and tighter regulation but requires redesign for 3MHz magnetics; RT8059ZSP provides better thermal handling in compact enclosures but sacrifices transient smoothness during mode transitions.
Availability
FAN5358S718X is available at Aetrix Electronics and suitable for mobile computing, wireless infrastructure, and consumer imaging applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production lots.
Supply support for FAN5358S718X 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 supplier focused on energy-efficient electronics, delivering power management, analog, sensor, and connectivity solutions for automotive, industrial, and cloud-edge applications.
The FAN5358S718X belongs to Fairchild's legacy high-frequency synchronous buck regulator product line, designed specifically for space-constrained portable electronics requiring ultra-low quiescent current and fast transient response at sub-2V output voltages.
FAQ
What is the output voltage tolerance of the FAN5358S718X over full load and temperature range?
The FAN5358S718X guarantees ±4.0% output voltage accuracy across 0–500mA load and –40°C to +85°C ambient temperature, as specified in the Electrical Characteristics table. This tolerance applies directly to the 1.8V nominal output and is measured under closed-loop conditions with recommended external components. The FAN5358S718X does not require external feedback resistors since it is a fixed-output device.
Does the FAN5358S718X support automatic mode transition between PWM and PFM?
Yes, the FAN5358S718X uses a proprietary quasi-fixed-frequency PWM modulator that automatically transitions between continuous conduction PWM mode and discontinuous-current PFM mode based on load current. This transition is near seamless with minimal VOUT glitch, as confirmed in Figure 9 of the datasheet. The FAN5358S718X maintains high efficiency (>80%) down to 1mA load without manual mode control.
What is the minimum recommended input capacitor for stable operation of the FAN5358S718X?
The FAN5358S718X requires a minimum 2.2µF X5R ceramic capacitor placed directly between VIN and GND pins. This value is specified in the Recommended Operating Conditions table and validated in Typical Application Figure 1. Lower values risk increased input ripple and potential control instability, especially under dynamic load conditions. The FAN5358S718X datasheet confirms that 2.2µF meets ESR and capacitance retention requirements across temperature and DC bias.
Can the FAN5358S718X operate safely with a shorted output condition?
Yes, the FAN5358S718X includes comprehensive protection: current limiting triggers after 12 consecutive PWM cycles in overcurrent, followed by thermal shutdown at 150°C and auto-restart after ~275µs. Under VOUT-to-GND short, power dissipation is internally limited to <100mW, preventing damage. These behaviors are documented in the Operation Description section and verified in Figure 16 of the FAN5358S718X datasheet.
Is the FAN5358S718X pin-compatible with other variants in the FAN5358 family?
Yes, all FAN5358 variants-including FAN5358S710X (1.0V), FAN5358S712X (1.2V), FAN5358S713X (1.3V), and FAN5358S718X (1.8V)-share identical SC70-6 pinout, electrical interface, and package dimensions. They differ only in factory-trimmed output voltage and corresponding output voltage accuracy specification (±4.5% for 1.0–1.3V, ±4.0% for 1.8V). No PCB layout change is required when substituting within the family.
FAN5358S718X 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):
- 1.8V
- 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)
FAN5358S718X FAQ
1.How can I place an order for FAN5358S718X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN5358S718X 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 FAN5358S718X reliable?
The price and inventory of FAN5358S718X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN5358S718X is usually 5 days.
3.What payment methods are accepted for FAN5358S718X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN5358S718X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN5358S718X?
FAN5358S718X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN5358S718X 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 FAN5358S718X?
For technical support, including FAN5358S718X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN5358S718X requirements.
6.How does Aetrix verify that FAN5358S718X is sourced from the original manufacturer or authorized distributors?
All FAN5358S718X 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 FAN5358S718X meets industry standards.
7.What is the process for return or replacement of FAN5358S718X?
All FAN5358S718X units undergo pre-shipment inspection (PSI). If there is an issue with FAN5358S718X, 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 FAN5358S718X part is unused and in its original packaging.
Return procedure for FAN5358S718X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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