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onsemi FAN2306MMPX
- Part No.:
- FAN2306MMPX
- Manufacturer:
- onsemi
- Package:
- 34-PowerTFQFN
- Datasheet:
-
FAN2306MMPX.pdf
- Description:
- IC REG BUCK ADJ 6A 34PQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,412
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Product details
Overview
FAN2306MMPX from ON Semiconductor (formerly Fairchild) is a 6 A synchronous buck regulator with PFM-only operation, no ultrasonic frequency clamp, and constant on-time control architecture. It operates from 4.5 V to 18 V input, delivers 0.6–5.5 V output, supports 200 kHz–1.5 MHz programmable switching frequency, and achieves >96% peak efficiency in server and notebook power rails.
For engineers reviewing the FAN2306MMPX datasheet, pinout, applications, or equivalent options, key selection criteria include its absence of minimum frequency clamp for ultra-light-load efficiency, valley-current limiting via ILIM resistor, thermal shutdown with 15°C hysteresis, and compatibility with 34-lead PQFN (5.5 mm × 5.0 mm) layout constraints.
Technical Context
The FAN2306MMPX uses constant on-time modulation with VIN feed-forward to maintain stable switching frequency in CCM while enabling seamless transition into PFM mode at light loads. Its zero-crossing detector (ZCD) disables the low-side MOSFET at inductor current reversal to eliminate reverse conduction and maximize efficiency below ~200 mA.
Unlike the FAN2306MPX, the FAN2306MMPX omits the 18–33 kHz minimum frequency clamp, allowing switching frequency to drop below audible range for lowest possible quiescent power. Protection includes dual-level over-voltage detection (108–115% and 118–125% of VREF), under-voltage lockout on VCC (4.4 V turn-on), and valley-current limiting with ±10% accuracy at 7 A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5 V to 18 V - supports wide-input industrial and computing rails without external pre-regulation. |
| Output Current | 6 A continuous - sustains full load at TJ ≤ 125°C with standard 4-layer PCB thermal design (θJA = 35°C/W). |
| Feedback Reference | 596 mV ±4 mV - enables precise 1.2 V output with ±1% tolerance over temperature using standard resistor divider. |
| Switching Frequency | 200 kHz to 1.5 MHz - programmable via single resistor on FREQ pin; no minimum clamp enables sub-audible PFM at microamp loads. |
| Efficiency Peak | >96% - achieved at mid-load (3–4 A) with 12 V input / 1.2 V output, critical for high-density DC/DC conversion. |
| Thermal Shutdown | 155°C trip with 15°C hysteresis - ensures safe recovery after overload without manual reset or external circuitry. |
| Soft-Start Time | Programmable via external capacitor (e.g., 15 nF = 1 ms) - prevents inrush current and enables controlled power-up sequencing. |
Pinout & Package
Package: 34-lead PQFN, 5.5 mm × 5.0 mm, 0.5 mm pitch, exposed thermal pad (PGND-connected). Thermal resistance θJA = 35°C/W on 4-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVIN (P2, Pins 5–11) | Power input for high-side MOSFET | High-current path for input supply; multiple parallel pins reduce IR drop and improve thermal spreading. |
| SW (P3, Pins 2, 12–17, 22) | Switching node | Connection point between internal HS/LS MOSFETs; requires tight layout to minimize EMI and voltage ringing. |
| BOOT (Pin 3) | High-side gate driver supply | Capacitor from BOOT to SW provides charge for HS gate drive; internal diode charges it from PVCC during freewheeling. |
| ILIM (Pin 24) | Valley current limit set-point | Resistor from ILIM to SW programs current limit threshold with ±10% accuracy at 7 A; open-detection protects against missing resistor. |
| FB (Pin 27) | Output voltage feedback | Monitors resistive divider output; 596 mV reference enables accurate regulation across 0.6–5.5 V range. |
| EN (Pin 29) | Enable control input | TTL-compatible logic interface; 0.8 V low / 2.0 V high thresholds support direct connection to 3.3 V or 5 V GPIO. |
| FREQ (Pin 32) | On-time and frequency programming | Resistor to AGND sets switching frequency; open-circuit detection disables switching to prevent runaway on-time. |
| PGOOD (Pin 30) | Power-good status indicator | Open-drain output asserts low when VOUT deviates >11% (UV) or >115% (OV1); 125 Ω pull-down supports fast rise/fall. |
Key Features
| Feature | Design Value |
|---|---|
| PFM-only operation (no ultrasonic clamp) | Enables sub-20 kHz switching at microamp loads, reducing idle power in always-on systems like NVDC notebooks. |
| Constant on-time control with VIN feed-forward | Maintains stable frequency across input voltage variation and eliminates need for loop compensation components. |
| Dual-level over-voltage protection | First level (108–115% VREF) shuts down both MOSFETs; second level (118–125% VREF) forces LS on to rapidly discharge output. |
| Valley-current limiting with adjustable threshold | Resistor-programmable ILIM pin provides cycle-by-cycle protection with ±10% accuracy and automatic recovery. |
| Thermal shutdown with hysteresis | 155°C trip and 140°C restart enable autonomous fault recovery without system intervention or external monitoring. |
Applications
| Server VR12/VR13 Core Power | Notebook NVDC System Rail |
|---|---|
Use Scenario: Delivering 1.2 V @ 6 A to CPU cores in dual-socket servers with dynamic load steps up to 3 A/µs. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing transient response, efficiency, and thermal safety. Use Value: Achieves <10 mV output deviation during 0–6 A load steps and maintains >92% efficiency at 1 A load due to PFM optimization. |
Use Scenario: Supplying 1.05 V or 1.2 V to GPU or SoC in fanless ultrabooks with strict acoustic and standby power limits. IC Role / Device Role / Timing Role: High-efficiency step-down regulator operating in ultralow-noise PFM mode during sleep states. Use Value: Eliminates audible noise by dropping switching frequency below 20 kHz and reduces quiescent current to <10 µA in shutdown. |
| Telecom Baseband Processor Rail | Storage Controller Power |
Use Scenario: Powering FPGA-based baseband processors in 5G small cells requiring rapid load transients and high reliability. IC Role / Device Role / Timing Role: Main DC/DC converter with integrated OVP/UVP/OTP protecting sensitive digital logic. Use Value: Dual OV thresholds prevent latch-up during hot-swap events; thermal hysteresis avoids oscillation near trip point. |
Use Scenario: Generating 3.3 V or 1.8 V for SSD controllers and NAND flash interfaces in enterprise storage arrays. IC Role / Device Role / Timing Role: Compact, high-current regulator mounted directly on storage module PCB. Use Value: 34-pin PQFN package fits dense layouts; 6 A rating supports burst-mode writes without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2315DJ-LF-Z | 4 A rated, fixed 500 kHz frequency, no PFM mode, smaller 8-pin SOIC package | Suitable for space-constrained but lower-current designs where light-load efficiency is secondary | Select when board area is critical and max load ≤4 A; avoid if sub-100 mA efficiency or programmable frequency required |
| TPS546B24RVFR | 6 A, PMBus-enabled, 400 kHz–2.2 MHz, integrated MOSFETs, higher BOM cost | Required for digitally controlled, telemetry-rich systems needing real-time voltage/current reporting | Choose only when digital interface, telemetry, or tighter output tolerance (<±0.5%) justifies added complexity and cost |
Compared with MP2315DJ-LF-Z and TPS546B24RVFR, the FAN2306MMPX offers unique PFM-only operation for lowest idle power, analog programmability without firmware, and proven thermal performance in high-density 5.5×5.0 mm footprint-making it optimal for cost-sensitive, high-reliability analog power rails.
Availability
FAN2306MMPX is available at Aetrix Electronics and suitable for server VRMs, notebook NVDC rails, telecom baseband supplies, and enterprise SSD power delivery requiring stable component supply and long-term manufacturability.
Supply support for FAN2306MMPX 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 leader in energy-efficient semiconductor solutions, specializing in power management, analog, sensor, and logic devices for automotive, industrial, and computing markets.
The FAN2306MMPX belongs to Fairchild's high-current synchronous buck regulator product line, designed specifically for high-efficiency, high-transient-response DC/DC conversion in space-constrained computing and communications infrastructure.
FAQ
What is the key functional difference between FAN2306MMPX and FAN2306MPX?
The FAN2306MMPX lacks the minimum frequency clamp present in the FAN2306MPX, allowing switching frequency to drop below 20 kHz in PFM mode for superior light-load efficiency. This makes FAN2306MMPX ideal for always-on, low-power applications like NVDC notebook rails where audible noise is not a concern but standby current must be minimized. The FAN2306MPX enforces an 18–33 kHz minimum frequency to avoid audible switching noise.
Does FAN2306MMPX require an external bootstrap capacitor?
Yes, FAN2306MMPX requires a ceramic capacitor (typically 0.1 µF) between BOOT and SW pins to supply gate drive charge for the internal high-side MOSFET. This capacitor is recharged through the internal boot diode connected to PVCC during the low-side conduction phase. Failure to place this capacitor will prevent proper high-side gate drive and cause regulator failure.
How is output voltage programmed on FAN2306MMPX?
Output voltage is programmed using a resistive divider from VOUT to AGND, with the FB pin connected to the divider midpoint. The internal reference is 596 mV ±4 mV, so VOUT = 0.596 × (1 + R1/R2). For example, a 1.2 V output uses R1 = 10.2 kΩ and R2 = 10 kΩ. The FB pin bias current is ±100 nA, minimizing divider error.
What thermal performance can be expected from FAN2306MMPX in a standard PCB layout?
In a 4-layer PCB (1 oz copper, 7 cm × 7 cm), FAN2306MMPX achieves θJA = 35°C/W. At 6 A load and 12 V input, junction temperature rise is approximately 25°C above ambient, keeping TJ well within the –40°C to +125°C operating range. The exposed thermal pad must be soldered to a solid PGND plane for optimal heat transfer.
Can FAN2306MMPX start up with a pre-biased output voltage?
Yes, FAN2306MMPX supports startup with a pre-biased output. During soft-start, the low-side MOSFET is disabled until the first PWM edge to prevent discharging the output capacitor. The regulator enters PFM mode during startup to ensure inductor current remains positive, avoiding reverse current flow and maintaining output stability even when VOUT is initially non-zero.
FAN2306MMPX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- TinyBuck®
- Package/Case:
- 34-PowerTFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 15V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 6A
- Frequency - Switching:
- 200kHz ~ 1.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 34-PQFN (5.5x5)
FAN2306MMPX FAQ
1.How can I place an order for FAN2306MMPX through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN2306MMPX 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 FAN2306MMPX reliable?
The price and inventory of FAN2306MMPX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN2306MMPX is usually 5 days.
3.What payment methods are accepted for FAN2306MMPX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN2306MMPX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN2306MMPX?
FAN2306MMPX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN2306MMPX 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 FAN2306MMPX?
For technical support, including FAN2306MMPX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN2306MMPX requirements.
6.How does Aetrix verify that FAN2306MMPX is sourced from the original manufacturer or authorized distributors?
All FAN2306MMPX 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 FAN2306MMPX meets industry standards.
7.What is the process for return or replacement of FAN2306MMPX?
All FAN2306MMPX units undergo pre-shipment inspection (PSI). If there is an issue with FAN2306MMPX, 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 FAN2306MMPX part is unused and in its original packaging.
Return procedure for FAN2306MMPX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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