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onsemi FAN5307MPX
- Part No.:
- FAN5307MPX
- Manufacturer:
- onsemi
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
FAN5307MPX.pdf
- Description:
- IC REG BUCK ADJ 300MA 6MLP
- Quantity:
- Payment:
- Shipping:
Inventory:2,016
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Product details
Overview
FAN5307MPX from Fairchild Semiconductor is a high-efficiency, synchronous step-down DC-DC converter in a 6-lead MLP 3×3 mm package, supporting adjustable output voltage (0.7 V to 0.8×VIN), 2.5–5.5 V input range, up to 300 mA load, and fixed 1 MHz PWM operation with power-save mode. It delivers 95% peak efficiency and 15 µA quiescent current for battery-powered portable electronics.
For engineers reviewing the FAN5307MPX datasheet, pinout, applications, or equivalent options, key selection criteria include its dual-mode PFM/PWM control architecture, dynamic voltage positioning for transient headroom, 100% duty-cycle low-dropout capability, and MLP package thermal performance in space-constrained designs.
Technical Context
The FAN5307MPX employs current-mode PWM control at full load (≥100 mA) with 1 MHz switching frequency and cycle-by-cycle current limiting (typ. 520 mA), ensuring tight line/load regulation and fast transient response. Its PFM pulse-skipping mode activates below ~80 mA peak inductor current, reducing quiescent current to 15 µA while maintaining regulated output via dynamic voltage positioning (0.8% above nominal).
It integrates synchronous P-channel and N-channel MOSFETs with on-resistances of 690 mΩ (P-ch, VIN=3.6 V) and 540 mΩ (N-ch, VIN=3.6 V), enabling 100% duty-cycle operation near VIN ≈ VOUT. The feedback reference is fixed at 0.5 V, and soft-start limits inrush current using a 4-step digital ramp to 520 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5 V to 5.5 V - supports single-cell Li-ion, Li-polymer, and multi-cell alkaline/NiMH battery inputs without external regulators. |
| Output Current | Up to 300 mA - sufficient for powering low-power DSPs, camera modules, and baseband processors in portable devices. |
| Switching Frequency | Fixed 1 MHz - enables use of small 10 µH inductors and 10–22 µF ceramic output capacitors, minimizing solution footprint. |
| Quiescent Current | 15 µA in Power-Save mode - extends battery runtime in standby/sleep states of handheld electronics. |
| Feedback Reference | 0.5 V - sets output voltage via external resistor divider (VOUT = 0.5 × (1 + R1/R2)), enabling precise adjustment across 0.7–0.8×VIN range. |
| Efficiency | Up to 95% - achieved through synchronous rectification and optimized gate drive, critical for thermal management in sealed enclosures. |
| Thermal Resistance θJC | 8 °C/W (MLP package) - enables higher continuous power dissipation than SOT-23, supporting sustained 300 mA loads in compact layouts. |
Pinout & Package
The FAN5307MPX is housed in a 6-lead Molded Leadless Package (MLP), 3 mm × 3 mm × 0.8 mm, with exposed thermal pad (PGND) for enhanced heat dissipation. Pin 1 is EN; pin 5 is PGND (power ground); pin 2 is GND (reference ground) - separation of signal and power grounds improves noise immunity and regulation stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | Enable control input | Logic HIGH (>1.3 V) enables regulation; logic LOW (<0.5 V) disables device and reduces supply current to <1 µA - supports system-level power sequencing. |
| GND (Pin 2) | Reference ground | Analog ground reference for error amplifier and feedback circuitry - must be routed separately from PGND to avoid noise coupling into FB node. |
| VIN (Pin 3) | Power input | Accepts 2.5–5.5 V supply; requires local 4.7 µF low-ESR ceramic capacitor placed adjacent to minimize high-frequency input ripple. |
| LX (Pin 4) | Switch node | Connects to external inductor; carries high di/dt switching current - requires short, wide trace and careful layout to reduce EMI. |
| PGND (Pin 5) | Power ground | Return path for internal N-channel MOSFET and inductor current - tied to thermal pad; must be connected to large copper pour for thermal and electrical performance. |
| FB (Pin 6) | Feedback input | Monitors output voltage via resistor divider; internal 0.5 V reference enables precise VOUT setting - sensitive node requiring guard ring and routing away from LX. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous PFM/PWM operation | Automatically transitions between fixed-frequency PWM (≥100 mA) and variable-frequency PFM (<80 mA), sustaining >85% efficiency down to 0.1 mA load. |
| Dynamic voltage positioning | Maintains output 0.8% above nominal during light-load PFM mode, providing headroom to absorb load transients without droop - eliminates need for oversized output capacitance. |
| 100% duty-cycle low-dropout | Enables VOUT regulation as VIN approaches VOUT (e.g., 1.8 V out from 2.0 V input), extending usable battery voltage range by ~200 mV compared to non-LDO-capable buck converters. |
| Digital soft-start | Four-step current ramp limits inrush to <500 µs startup time with 10 µF COUT and 200 mA load - prevents input rail collapse and output overshoot in multi-rail systems. |
| Separate GND and PGND pins | Reduces ground bounce and improves load regulation accuracy by isolating analog reference ground from high-current power return paths - critical for noise-sensitive RF/baseband supplies. |
Applications
| Smartphone Baseband Supply | Digital Camera Core Logic |
|---|---|
|
Use Scenario: Powers ARM-based application processor core (1.2–1.5 V) from single-cell Li-ion battery (3.0–4.2 V) during active and sleep modes. IC Role / Device Role / Timing Role: Primary step-down regulator delivering tightly regulated, low-noise VDD_CORE with fast load transient response to handle CPU burst activity. Use Value: 95% efficiency at 200 mA and 15 µA quiescent current extend talk time by >12% versus legacy asynchronous buck converters; MLP thermal performance sustains 300 mA bursts without derating. |
Use Scenario: Supplies image signal processor (ISP) and memory interface (1.8 V) in compact digital cameras powered by two AA batteries (2.4–3.2 V). IC Role / Device Role / Timing Role: Adjustable-output buck converter configured for 1.8 V, providing stable rail during auto-focus motor activation and sensor readout. Use Value: Dynamic voltage positioning ensures <10 mV droop during 100 mA load steps; 1 MHz switching allows 10 µH inductor size reduction by 40% vs. 500 kHz alternatives. |
| Portable Medical Sensor Node | Wireless Headset Audio Codec |
|
Use Scenario: Powers ultra-low-power microcontroller and analog front-end (1.5 V) in battery-operated glucose monitor with 5-year shelf life requirement. IC Role / Device Role / Timing Role: High-efficiency, low-IQ DC-DC converter enabling long-term operation from coin-cell or small Li-polymer battery. Use Value: 15 µA quiescent current in PFM mode reduces no-load power loss to <75 nW/V, directly contributing to >10-year battery shelf life per IEC 62366-1 requirements. |
Use Scenario: Generates clean 1.2 V supply for Bluetooth audio codec IC from 3.6 V Li-polymer cell in noise-sensitive earbud design. IC Role / Device Role / Timing Role: Low-noise synchronous buck regulator with separated GND/PGND pins minimizing PSRR degradation in analog audio paths. Use Value: 8 °C/W θJC and MLP thermal pad enable 300 mA delivery without external heatsink; 1 MHz operation avoids interference with 2.4 GHz ISM band. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Texas Instruments TPS62231DRVR | Fixed 1.8 V output only; 2.05–6.5 V input; 300 mA; 1.8 MHz switching; 17 µA IQ; 6-pin WSON package. | Not adjustable - requires redesign if VOUT flexibility needed; higher fSW demands smaller inductors but increases EMI filtering complexity. | Select when fixed 1.8 V output suffices and board space favors WSON over MLP; verify EMI compliance with 1.8 MHz edge rates. |
| Analog Devices ADP2119ACPZ-R7 | Adjustable 0.8–5.5 V output; 2.3–5.5 V input; 600 mA; 1.2 MHz; 25 µA IQ; 8-pin LFCSP package. | Higher current rating and wider input range - over-specified for 300 mA portable apps; larger package and higher IQ reduce battery life advantage. | Choose only if future-proofing for >300 mA loads or tighter input voltage tolerance is required; otherwise FAN5307MPX offers better size/IQ trade-off. |
Compared with TPS62231DRVR and ADP2119ACPZ-R7, the FAN5307MPX provides unique value in adjustable-output, ultra-low-IQ operation within a thermally optimized 3×3 mm MLP footprint - making it optimal for cost- and space-constrained portable designs where VOUT flexibility and battery longevity are prioritized over maximum current headroom or highest switching frequency.
Availability
FAN5307MPX is available at Aetrix Electronics and suitable for smartphone baseband supplies, digital camera core logic, portable medical sensor nodes, wireless headset audio codecs, and other battery-powered embedded systems requiring stable component supply with consistent parametric performance and RoHS-compliant packaging.
Supply support for FAN5307MPX 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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete solutions before its acquisition by ON Semiconductor in 2016. Its products emphasized high-efficiency, small-footprint power conversion for portable electronics.
The FAN5307MPX belongs to Fairchild's FAN53xx family of high-efficiency synchronous buck converters designed specifically for battery-powered portable devices demanding extended runtime, compact PCB area, and robust transient performance under dynamic load conditions.
FAQ
What is the feedback reference voltage of the FAN5307MPX?
The FAN5307MPX has a fixed internal feedback reference voltage of 0.5 V. This value is used in the resistor divider equation VOUT = 0.5 × (1 + R1/R2) to set the adjustable output voltage. The 0.5 V reference is specified across –40°C to +85°C and contributes to ±4% output voltage accuracy over temperature and load conditions. This reference is integral to the error amplifier and remains stable regardless of input voltage or operating mode (PWM or PFM). The FAN5307MPX relies on this precise reference to maintain regulation during dynamic load transients and low-power operation.
Does the FAN5307MPX support 100% duty-cycle operation, and what is its practical benefit?
Yes, the FAN5307MPX supports 100% duty-cycle operation when the input voltage approaches the output voltage. In this mode, the P-channel MOSFET remains continuously on, and VOUT ≈ VIN – ILOAD × (RDSON_P + RL). This feature extends usable battery life by allowing regulation down to VIN values only ~200 mV above VOUT - for example, sustaining 1.8 V output from a Li-ion cell discharging to 2.0 V. Without 100% duty-cycle capability, the FAN5307MPX would drop out of regulation earlier, wasting residual battery energy. This behavior is confirmed in the datasheet's "100% Duty Cycle Operation" section and validated across temperature.
How does dynamic voltage positioning work in the FAN5307MPX, and why is it important?
In Power-Save (PFM) mode, the FAN5307MPX shifts the regulated output voltage 0.8% above its nominal value - e.g., 1.814 V instead of 1.8 V - to provide additional headroom during sudden load increases. When a transient occurs (e.g., CPU wake-up), the stored energy in the output capacitor bridges the gap until the control loop responds, minimizing droop. This eliminates the need for oversized output capacitance while maintaining tight regulation. The feature is automatic, requires no external components, and is active only in PFM mode - verified in Figure 6 (Load Transient Response) and the "Dynamic Output Voltage Positioning" specification in the datasheet.
What are the recommended external components for the FAN5307MPX in an adjustable-output configuration?
For the FAN5307MPX adjustable version, the recommended components are: a 10 µH shielded inductor rated ≥400 mA saturation current; a 4.7 µF X5R/X7R ceramic input capacitor placed adjacent to VIN and GND; a 10–22 µF X5R/X7R ceramic output capacitor; and an external resistor divider (R1 + R2 ≤ 1 MΩ) with R2 connected to FB and GND. The feedback resistors must be precision types (±1%) to achieve the ±4% output accuracy. Layout best practices include separating FB trace from LX, using separate GND and PGND pours, and connecting the MLP thermal pad to a solid copper plane - all detailed in the "Application Information" section of the FAN5307MPX datasheet.
What is the thermal resistance (θJC) of the FAN5307MPX, and how does it compare to the SOT-23 variant?
The FAN5307MPX in the 6-lead MLP 3×3 mm package has a junction-to-case thermal resistance (θJC) of 8 °C/W, measured from die to the exposed thermal pad (Pin 5, PGND). This is significantly lower than the 5-lead SOT-23 variant's θJC of 130 °C/W, due to the MLP's direct thermal path through the copper pad. As a result, the FAN5307MPX can sustain 300 mA continuous output at ambient temperatures up to +85°C without derating, whereas the SOT-23 version requires substantial copper area or airflow to achieve the same. This difference is documented in the "Absolute Maximum Ratings" table and confirmed in thermal characterization data on page 4 of the FAN5307MPX datasheet.
FAN5307MPX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 6-WDFN 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):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.7V
- Voltage - Output (Max):
- 4.4V
- Current - Output:
- 300mA
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-MLP (3x3)
FAN5307MPX FAQ
1.How can I place an order for FAN5307MPX through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN5307MPX 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 FAN5307MPX reliable?
The price and inventory of FAN5307MPX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN5307MPX is usually 5 days.
3.What payment methods are accepted for FAN5307MPX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN5307MPX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN5307MPX?
FAN5307MPX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN5307MPX 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 FAN5307MPX?
For technical support, including FAN5307MPX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN5307MPX requirements.
6.How does Aetrix verify that FAN5307MPX is sourced from the original manufacturer or authorized distributors?
All FAN5307MPX 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 FAN5307MPX meets industry standards.
7.What is the process for return or replacement of FAN5307MPX?
All FAN5307MPX units undergo pre-shipment inspection (PSI). If there is an issue with FAN5307MPX, 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 FAN5307MPX part is unused and in its original packaging.
Return procedure for FAN5307MPX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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