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onsemi FAN5358S712X
- Part No.:
- FAN5358S712X
- Manufacturer:
- onsemi
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
FAN5358S712X.pdf
- Description:
- IC REG BUCK 1.2V 500MA SC88
- Quantity:
- Payment:
- Shipping:
Inventory:2,975
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Product details
Overview
FAN5358S712X from ON Semiconductor is a fixed-output synchronous buck DC-DC regulator delivering 1.2V at up to 500mA from a 2.7–5.5V input, operating at 2MHz nominal switching frequency with 25µA quiescent current in PFM mode-designed for power management in space-constrained mobile applications such as smartphone baseband processors and RF transceivers.
For engineers reviewing the FAN5358S712X datasheet, pinout, applications, or equivalent options, key selection criteria include output voltage accuracy (±4.5%), SC70-6 thermal performance (θJA = 285°C/W), UVLO threshold (2.4–2.6V), and seamless PWM/PEM transition behavior under dynamic load conditions.
Technical Context
The FAN5358S712X employs a proprietary quasi-fixed-frequency PWM modulator with synchronous rectification, enabling fast transient response independent of output capacitor ESR. Its control scheme supports discontinuous conduction mode (DCM) single-pulse PFM operation at light loads to maintain high efficiency down to 1mA.
Internal soft-start (70µs ramp), input under-voltage lockout (UVLO with 225mV hysteresis), and thermal shutdown (150°C activation with 20°C hysteresis) are integrated. The device enforces peak current limiting (750–1150mA) and enters auto-restart cycling upon persistent overload.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.2V ±4.5% - ensures stable core supply for low-voltage digital ICs without external feedback network. |
| Switching Frequency | 2MHz nominal - enables use of compact 2.2µH inductor and 4.7µF ceramic output capacitor, reducing board area. |
| Quiescent Current | 25µA typical in PFM mode - extends battery life in standby states while preserving fast load-step response. |
| Input Voltage Range | 2.7V to 5.5V - compatible with single-cell Li-ion, Li-polymer, and regulated 3.3V/5V rails. |
| Output Current | 500mA continuous - sufficient for powering ARM Cortex-A/M cores, DDR I/O, or RF front-end bias circuits. |
| UVLO Threshold | 2.4V to 2.6V rising - prevents erratic startup during battery brownout and ensures clean enable sequencing. |
| Thermal Shutdown | 150°C junction activation with 20°C hysteresis - protects against sustained overload or poor PCB thermal design. |
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 PWM current - must minimize trace inductance and avoid routing near sensitive analog signals. |
| 2,5 - GND | Power and IC ground | Dual ground pins reduce impedance path for return currents; both must connect to solid ground plane with multiple vias. |
| 3 - VOUT | Output voltage / feedback sense | Direct connection to output capacitor anode; senses regulated 1.2V - no external resistor divider required due to internal fixed reference. |
| 4 - EN | Enable control input | Logic-level interface: <0.4V = shutdown (<1µA IQ), >1.2V = active; must not float - tie to VIN or microcontroller GPIO. |
| 6 - VIN | Input power supply | Accepts 2.7–5.5V; requires local 2.2µF ceramic capacitor placed within 2mm of pin to suppress high-frequency noise and prevent instability. |
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/PWM seamless transition | Minimizes output voltage glitch (<10mV) during mode switching - critical for noise-sensitive RF and audio subsystems. |
| Internal soft-start | 70µs controlled ramp prevents inrush current into large output capacitance, avoiding input rail collapse during power-up. |
| Over-current protection | Peak current limit triggers after 12 consecutive cycles in limit - provides robust short-circuit immunity without latch-off. |
| Low-noise light-load operation | 25µA quiescent current + DCM PFM architecture achieves <20mVPP ripple at 1mA load - suitable for always-on sensor nodes. |
Applications
| Smartphone Application Processor Core Supply | Wi-Fi/Bluetooth RF Transceiver Bias |
|---|---|
|
Use Scenario: Powering ARM Cortex-A7/A53 CPU cores requiring tightly regulated 1.2V at dynamic loads from 1mA (idle) to 500mA (burst). IC Role / Device Role / Timing Role: Primary step-down regulator supplying core logic voltage; operates in PFM during sleep, PWM during compute-intensive tasks. Use Value: Maintains >80% efficiency at 1mA and <10µs transient recovery time - preserves battery runtime and prevents voltage droop-induced crashes. |
Use Scenario: Providing clean, low-noise 1.2V bias to Wi-Fi 5GHz PA drivers and Bluetooth BLE radio LNA stages. IC Role / Device Role / Timing Role: Local point-of-load regulator decoupled from noisy system rail; delivers stable voltage during rapid TX/RX state transitions. Use Value: Achieves <20mVPP output ripple in PFM mode and minimal switching noise coupling - avoids RX desensitization and EVM degradation. |
| Ultra-Mobile PC DDR I/O Termination | Cellular Modem Baseband ASIC Supply |
|
Use Scenario: Generating 1.2V termination voltage for DDR3L/DDR4 memory interfaces in netbooks and tablets. IC Role / Device Role / Timing Role: Dedicated VTT regulator supporting bidirectional current sourcing/sinking; tracks half-VDDQ with tight tolerance. Use Value: Delivers 500mA sink/source capability with ±4.5% accuracy - ensures signal integrity across temperature and process variation. |
Use Scenario: Supplying 1.2V to LTE/5G baseband SoCs with bursty processing demands and strict thermal envelope limits. IC Role / Device Role / Timing Role: High-efficiency main domain regulator handling 0–500mA load swings synchronized to modem activity states. Use Value: 2MHz switching enables small passive footprint while thermal shutdown (150°C) prevents sustained overtemperature in sealed enclosures. |
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 | 1.2V fixed, 2.05MHz, 300mA max, 17µA IQ, 1.8–6.5V input - lower current rating and wider input range. | Not suitable for 500mA continuous loads; better for ultra-low-IQ sensor nodes than high-current modem supplies. | Select only if load never exceeds 300mA and input may exceed 5.5V. |
| RT8059GJ6 | 1.2V fixed, 2MHz, 600mA max, 35µA IQ, 2.5–5.5V input - higher current but higher quiescent current and no UVLO hysteresis spec. | Acceptable for higher-current apps but less optimized for battery standby; lacks documented thermal hysteresis behavior. | Prefer when 600mA headroom is needed and 10µA extra IQ is acceptable. |
Compared with TPS62231DRYR and RT8059GJ6, the FAN5358S712X uniquely balances 500mA capability, 25µA light-load IQ, and guaranteed ±4.5% output accuracy across -40°C to +85°C - making it optimal for thermally constrained mobile SoC domains where both peak current and standby efficiency matter.
Availability
FAN5358S712X is available at Aetrix Electronics and suitable for smartphone processor core supplies, Wi-Fi RF bias rails, and DDR I/O termination requiring stable component supply, consistent parametric performance, and long-term industrial availability.
Supply support for FAN5358S712X 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 (formerly Fairchild Semiconductor) is a global semiconductor manufacturer specializing in energy-efficient power management, analog, and sensor solutions for automotive, industrial, and portable electronics.
The FAN5358 series was designed specifically for ultra-compact, high-efficiency point-of-load regulation in battery-powered mobile devices - emphasizing low quiescent current, small external components, and robust protection features.
FAQ
What is the output voltage tolerance of the FAN5358S712X over temperature and load?
The FAN5358S712X guarantees ±4.5% output voltage accuracy across the full operating range of -40°C to +85°C ambient temperature and 0–500mA load current. This specification is verified per the Electrical Characteristics table in the official datasheet Rev. 1.0.3, with typical deviation under 1% at 25°C and 3.6V input. The FAN5358S712X uses an internal trimmed reference to achieve this stability without external components.
Does the FAN5358S712X require an external feedback resistor network?
No, the FAN5358S712X does not require an external feedback resistor network. It is a fixed-output regulator with the 1.2V reference internally configured - pin 3 (VOUT) serves as both output and feedback node. This eliminates resistor matching errors and saves PCB area. The FAN5358S712X achieves its specified ±4.5% accuracy using factory-trimmed internal circuitry, confirmed in the datasheet's Regulation section.
How does the FAN5358S712X behave during input undervoltage conditions?
The FAN5358S712X incorporates an under-voltage lockout (UVLO) circuit that disables switching when VIN falls below 2.4–2.6V (rising threshold) and remains disabled until hysteresis (225mV) is satisfied. During UVLO, the device draws <1µA and holds output in discharge state via internal NMOS. This behavior prevents erratic operation during battery brownout and is fully characterized in the Absolute Maximum and Recommended Operating Conditions tables of the FAN5358S712X datasheet.
Can the FAN5358S712X drive a 10µF output capacitor safely during startup?
Yes, the FAN5358S712X can safely drive a 10µF output capacitor if the minimum load resistance meets RLOAD ≥ VOUT/0.40 = 3Ω (per Table 2 in the datasheet). Exceeding this COUT without adequate load may cause soft-start failure due to current-limit triggering. For reliable startup with 10µF, ensure the application maintains ≥3Ω effective load or uses staggered enable sequencing. This limitation is explicitly defined for the FAN5358S712X in the Operation Description section.
What thermal derating applies to the FAN5358S712X at 500mA output?
At 500mA output, the FAN5358S712X requires careful thermal design: Figure 20 in the datasheet shows the safe operating area collapses above ~3.5V input when ambient exceeds 60°C. With θJA = 285°C/W on a standard 2-layer board, junction temperature rises ~140°C above ambient at full load - so operation above 65°C ambient requires enhanced copper pour or airflow. The FAN5358S712X thermal shutdown activates at 150°C with 20°C hysteresis, as confirmed in the Electrical Characteristics table.
FAN5358S712X 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):
- 1.2V
- 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)
FAN5358S712X FAQ
1.How can I place an order for FAN5358S712X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN5358S712X 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 FAN5358S712X reliable?
The price and inventory of FAN5358S712X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN5358S712X is usually 5 days.
3.What payment methods are accepted for FAN5358S712X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN5358S712X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN5358S712X?
FAN5358S712X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN5358S712X 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 FAN5358S712X?
For technical support, including FAN5358S712X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN5358S712X requirements.
6.How does Aetrix verify that FAN5358S712X is sourced from the original manufacturer or authorized distributors?
All FAN5358S712X 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 FAN5358S712X meets industry standards.
7.What is the process for return or replacement of FAN5358S712X?
All FAN5358S712X units undergo pre-shipment inspection (PSI). If there is an issue with FAN5358S712X, 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 FAN5358S712X part is unused and in its original packaging.
Return procedure for FAN5358S712X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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