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onsemi FAN5307MP18X
- Part No.:
- FAN5307MP18X
- Manufacturer:
- onsemi
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
FAN5307MP18X.pdf
- Description:
- IC REG BUCK 1.8V 300MA 6MLP
- Quantity:
- Payment:
- Shipping:
Inventory:1,403
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Product details
Overview
FAN5307MP18X from Fairchild Semiconductor is a fixed-output 1.8V, synchronous step-down DC-DC converter optimized for battery-powered portable electronics. It delivers up to 300mA output current across a 2.5V–5.5V input range, operates at 1MHz PWM frequency with 95% peak efficiency, and features power-save mode with 15µA quiescent current - enabling extended runtime in cell phones and digital cameras.
For engineers reviewing the FAN5307MP18X datasheet, pinout, applications, or equivalent options, key selection criteria include its 6-lead MLP 3×3mm package, fixed 1.8V output accuracy (±4%), dynamic voltage positioning for transient headroom, and integrated soft-start with 500µs typical startup time into 200mA load.
Technical Context
The FAN5307MP18X employs current-mode PWM control with automatic transition to pulse-frequency modulation (PFM) at light loads, maintaining high efficiency across 0.1mA–300mA output range. Its dual-ground architecture separates PGND and GND to minimize noise coupling and improve load transient response.
It integrates P- and N-channel MOSFETs with typical RDS(on) of 690mΩ (P-ch) and 540mΩ (N-ch) at 3.6V, supports 100% duty-cycle low-dropout operation, and includes over-voltage clamp (1.878–1.930V) and cycle-by-cycle current limiting (400–700mA) for robust protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±4% - ensures stable core supply for low-power DSPs and baseband processors without external feedback resistors. |
| Input Voltage Range | 2.5V to 5.5V - compatible with single-cell Li-ion (3.0–4.2V), Li-polymer, and dual-cell alkaline/NiMH batteries. |
| Max Output Current | 300mA - sufficient for powering RF transceivers, camera image sensors, or microcontroller cores in handheld devices. |
| Switching Frequency | 1MHz (800–1200kHz) - enables use of compact 10µH inductors and 10µF ceramic output capacitors, reducing solution footprint. |
| Quiescent Current | 15µA in Power-Save mode - extends battery life during standby or low-activity states in portable applications. |
| Efficiency | Up to 95% at 200mA/3.6V input - minimizes thermal dissipation in space-constrained PCB layouts. |
| Load Regulation | 0.0014%/mA (MLP package) - maintains tight output stability across full load range, critical for noise-sensitive analog circuits. |
Pinout & Package
Package: 6-lead Molded Leadless Package (MLP), 3mm × 3mm × 0.8mm, thermally enhanced with exposed PGND pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable input | Active-high logic control; pulls supply current below 1µA in shutdown - enables system-level power sequencing. |
| GND | Reference ground | Analog reference return for internal error amplifier and feedback circuitry - must be isolated from high-current paths. |
| VIN | Input supply | Accepts 2.5–5.5V; requires local 4.7µF low-ESR ceramic capacitor placed adjacent to pin for EMI suppression. |
| LX | Switch node | Connects to inductor; carries high di/dt switching current - demands short, wide trace routing to minimize ringing. |
| PGND | Power ground | High-current return path for internal N-MOSFET; tied directly to exposed thermal pad for optimal heat dissipation. |
| FB | Feedback input | Internally connected to 1.8V reference; shorted to VOUT in fixed-output version - no external resistor divider required. |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic Voltage Positioning | Shifts output +0.8% above nominal during light-load PFM mode - provides headroom to absorb sudden load steps without undershoot. |
| Soft Start | Digital four-step current ramp limits inrush; achieves 500µs typical startup into 200mA load with 10µF COUT - prevents input rail collapse. |
| 100% Duty-Cycle Operation | Enables dropout as low as ILOAD × RDS(on) - sustains regulation when VIN approaches 1.8V, extending usable battery range. |
| Over-Voltage Clamp | 1.878–1.930V threshold - protects downstream 1.8V logic from transient overshoot during load release or mode transitions. |
| Integrated Current Limit | 400–700mA cycle-by-cycle protection - prevents thermal runaway during short-circuit or overload without external sensing components. |
Applications
| Cell Phone Baseband Supply | Digital Camera Image Sensor Bias |
|---|---|
|
Use Scenario: Powers ARM-based baseband processor core in GSM/UMTS handsets operating from single-cell Li-ion battery. IC Role / Device Role / Timing Role: Primary 1.8V DC-DC regulator delivering regulated power with fast transient response to handle burst-mode RF transmission. Use Value: 95% efficiency at 200mA and 15µA quiescent current extend talk time by >12% versus legacy linear regulators under mixed-load conditions. |
Use Scenario: Supplies bias voltage to CMOS image sensor in compact digital cameras with auto-focus and video capture. IC Role / Device Role / Timing Role: Fixed-output step-down converter providing low-noise 1.8V rail with minimal ripple (<1% at light load) for analog pixel readout. Use Value: MLP package's separated PGND/GND reduces switching noise coupling into analog signal chain, improving SNR by ≥3dB. |
| PDA Application Processor Core | Low-Power DSP Audio Codec |
|
Use Scenario: Delivers clean 1.8V supply to application CPU in handheld PDAs with touch interface and wireless connectivity. IC Role / Device Role / Timing Role: Synchronous buck converter supporting dynamic voltage scaling (DVS) via enable-controlled power gating. Use Value: 1MHz switching allows use of miniature 10µH shielded inductor, reducing total solution area by 35% vs. 500kHz alternatives. |
Use Scenario: Powers audio DSP and stereo codec in portable media players requiring ultra-low quiescent current during playback pause. IC Role / Device Role / Timing Role: High-efficiency DC-DC source with PFM mode active below 10mA - maintains regulation while drawing only 15µA. Use Value: Power-save mode eliminates need for separate LDO in standby path, simplifying BOM and reducing board count by one component. |
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 TPS62231DRYR | 1.8V fixed output, 300mA, 2.05–6.0V input, 1.8MHz switching, 22µA IQ - higher frequency but wider input range and slightly higher quiescent current. | Supports higher VIN (up to 6V); less suitable for strict 2.5V minimum input systems like deeply discharged Li-ion. | Select when input rail may exceed 5.5V or when smaller inductor size (e.g., 4.7µH) is prioritized over lowest IQ. |
| Analog Devices ADP2105ARMZ-1.8-R7 | 1.8V fixed output, 600mA, 2.3–5.5V input, 3MHz switching, 30µA IQ - double current capability but higher quiescent current and no dynamic voltage positioning. | Targeted at higher-current applications; lacks DVP feature, resulting in larger transient undershoot during load steps. | Select when future-proofing for >300mA loads or when 3MHz operation is needed to avoid AM band interference. |
Compared with TPS62231DRYR and ADP2105ARMZ-1.8-R7, the FAN5307MP18X offers the lowest quiescent current (15µA) and unique dynamic voltage positioning - making it optimal for battery runtime-critical, low-noise portable designs where 300mA output suffices and input stays within 2.5–5.5V.
Availability
FAN5307MP18X is available at Aetrix Electronics and suitable for cell phones, digital cameras, PDAs, and low-power DSP supplies requiring stable component supply with RoHS-compliant, green packaging and tape-and-reel delivery.
Supply support for FAN5307MP18X 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 analog and power IC manufacturer, acquired by ON Semiconductor in 2016; known for high-performance power management and discrete solutions.
The FAN5307 product line was designed specifically for ultra-compact, high-efficiency DC-DC conversion in battery-powered portable devices - emphasizing low IQ, small MLP/SOT-23 footprints, and robust transient performance.
FAQ
What is the output voltage tolerance of the FAN5307MP18X under full load and temperature range?
The FAN5307MP18X guarantees a fixed 1.8V output with ±4% accuracy across the full operating ambient temperature range (−40°C to +85°C), 2.5V–5.5V input, and 0–300mA load. This specification is verified per the Electrical Characteristics table for the fixed 1.8V version in the datasheet Rev. 1.0.5, ensuring reliable core voltage delivery for 1.8V logic interfaces without external trimming.
Does the FAN5307MP18X require external feedback resistors to set its output voltage?
No, the FAN5307MP18X does not require external feedback resistors. As a factory-configured fixed-output variant, its FB pin is internally connected to a precision 0.5V reference and the 1.8V output divider - eliminating external components and reducing layout sensitivity. This differs from the adjustable FAN5307MPX version, which requires an external resistor network.
How does the FAN5307MP18X manage efficiency at very light loads (e.g., <1mA)?
The FAN5307MP18X enters Power-Save Mode (PFM) below ~80mA load, reducing switching frequency and quiescent current to 15µA. At sub-mA loads, it pulses only as needed to maintain regulation - achieving >85% efficiency even at 0.1mA with 3.6V input, as shown in Figure 11 of the datasheet. This preserves battery capacity during device sleep states.
What is the recommended PCB layout practice for the PGND and GND pins on the FAN5307MP18X?
The FAN5307MP18X's 6-lead MLP package separates PGND (Pin 5) and GND (Pin 2) to isolate high-current power return from sensitive analog ground. Layout best practice requires connecting PGND directly to the exposed thermal pad and routing it separately to the input capacitor ground, while keeping GND a quiet, dedicated analog return path tied only to FB and EN. This separation improves noise immunity and transient response.
Can the FAN5307MP18X operate with a 2.5V input and still regulate 1.8V output reliably?
Yes, the FAN5307MP18X supports 100% duty-cycle operation down to 2.5V input, maintaining regulation with minimal dropout - VOUT = VIN − ILOAD × RDS(on). At 200mA and 2.5V input, typical dropout is ~140mV (using 690mΩ P-MOS RDS(on)), yielding ~2.36V - well above 1.8V. Full regulation is confirmed in the Recommended Operating Conditions table for VIN ≥2.5V.
FAN5307MP18X 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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- 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)
FAN5307MP18X FAQ
1.How can I place an order for FAN5307MP18X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN5307MP18X 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 FAN5307MP18X reliable?
The price and inventory of FAN5307MP18X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN5307MP18X is usually 5 days.
3.What payment methods are accepted for FAN5307MP18X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN5307MP18X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN5307MP18X?
FAN5307MP18X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN5307MP18X 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 FAN5307MP18X?
For technical support, including FAN5307MP18X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN5307MP18X requirements.
6.How does Aetrix verify that FAN5307MP18X is sourced from the original manufacturer or authorized distributors?
All FAN5307MP18X 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 FAN5307MP18X meets industry standards.
7.What is the process for return or replacement of FAN5307MP18X?
All FAN5307MP18X units undergo pre-shipment inspection (PSI). If there is an issue with FAN5307MP18X, 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 FAN5307MP18X part is unused and in its original packaging.
Return procedure for FAN5307MP18X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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