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onsemi FAN2106MPX
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- Part No.:
- FAN2106MPX
- Manufacturer:
- onsemi
- Package:
- 25-WQFN Exposed Pad
- Datasheet:
-
FAN2106MPX.pdf
- Description:
- IC REG BUCK ADJ 6A 25MLP
- Quantity:
- Payment:
- Shipping:
Inventory:4,374
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Product details
Overview
FAN2106MPX from ON Semiconductor is a fully integrated 6 A synchronous buck regulator with internal high- and low-side MOSFETs, operating from 3 V to 24 V input and delivering adjustable output from 0.8 V to 80% of VIN. It features programmable 200–600 kHz switching frequency, 1% reference accuracy over temperature, and power-good signaling - deployed in point-of-load regulation for graphics cards and telecom infrastructure.
For engineers reviewing the FAN2106MPX datasheet, pinout, applications, or equivalent options, key selection criteria include its 5×6 mm MLP-25 package with thermal pads, external loop compensation capability, pre-biased startup support, lossless current-mode control architecture, and integrated protections including over-temperature, over-voltage, under-voltage, and cycle-by-cycle current limiting.
Technical Context
The FAN2106MPX implements a summing current-mode PWM controller with voltage feedforward via the RAMP pin, enabling stable operation across wide input ranges. Its modulator sums an amplified current-sense signal with an internally generated ramp, compared against the error amplifier output to drive the high-side MOSFET.
It integrates both power MOSFETs and driver circuitry in a single thermally optimized MLP package, eliminating discrete gate-drive layout challenges and minimizing parasitic inductance. The device supports external compensation (Type-2 or Type-3), programmable current limit via ILIM, and soft-start timing synchronized to switching frequency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3 V to 24 V - supports wide-range industrial, telecom, and computing rails without external pre-regulation. |
| Output Current | 6 A continuous - sufficient for GPU core, FPGA I/O, or ASIC point-of-load applications. |
| Reference Accuracy | ±1% over –40°C to +85°C - ensures tight output regulation across ambient and junction temperature variations. |
| Switching Frequency | 200 kHz to 600 kHz - adjustable via RT resistor; enables optimization between efficiency, size, and EMI performance. |
| Peak Efficiency | >95% - achieved using synchronous rectification with integrated low-RDS(ON) MOSFETs and internal bootstrap diode. |
| Protection Features | Over-current (16-cycle latch), over-voltage (115% VOUT), under-voltage (73% VOUT), thermal shutdown (155°C) - autonomous fault response without external supervision. |
| Package | 5×6 mm, 25-pin MLP with 3 thermal pads - provides low θJC (4–7°C/W) and supports high-power density PCB layouts. |
Pinout & Package
The FAN2106MPX uses a 5×6 mm molded leadless package (MLP) with 25 terminals and three exposed thermal pads (P1, P2, P3) on the bottom surface for enhanced heat dissipation. Pin numbering follows bottom-view orientation per Figure 3 in the datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (P1, 6–12) | Switching Node | Junction of internal high- and low-side MOSFETs; connects directly to output inductor - requires low-inductance layout and Kelvin sensing for stability. |
| VIN (P2, 2–5) | Main Power Input | Accepts 3–24 V supply; multiple pins reduce IR drop and improve current sharing into internal power stages. |
| PGND (P3, 21–23) | Power Ground Return | Low-impedance return path for high-side and low-side MOSFET sources - must be connected to thermal pad and separated from AGND at single point. |
| BOOT (1) | High-Side Gate Drive Supply | Connected via capacitor to SW; internal bootstrap diode recharges it during low-side conduction - eliminates need for external diode. |
| PGOOD (13) | Open-Drain Power-Good Flag | Pulls low when FB voltage deviates >±11% from 0.8 V reference; asserts high only after soft-start completes (T1.0). |
| EN (14) | Enable Control Input | Logic-high active with internal 800 kΩ pull-up; toggling resets latched faults - supports sequencing and system-level enable coordination. |
| VCC (15) | Bias Supply Input | 5 V ±0.5 V analog/digital supply; powers internal logic and gate drivers - requires ≥1 µF X5R/X7R decoupling to PGND. |
| AGND (16) | Analog Ground Reference | Signal ground for feedback, error amp, and compensation network - must tie to PCB ground island with minimal impedance. |
| ILIM (17) | Current Limit Programming | Resistor to AGND sets trip threshold below default 6–10 A; enables de-rating for thermal or reliability constraints. |
| R(T) (18) | Oscillator Frequency Set | RT resistor to AGND determines switching frequency; supports precise EMI tuning and efficiency trade-offs. |
| FB (19) | Feedback Input | Monitors output via resistor divider; 0.8 V reference enables scalable output from 0.8 V to 19.2 V (80% of 24 V). |
| COMP (20) | Error Amplifier Output | Connects external Type-2/Type-3 compensation network between COMP and FB - enables loop stability across load and line transients. |
| RAMP (25) | Voltage Feedforward Input | RRAMP resistor to VIN adjusts internal ramp slope - improves transient response and line regulation over wide VIN range. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Synchronous Power Stage | Eliminates external MOSFETs and gate drivers - reduces BOM count, layout area, and gate-loop parasitics for 6 A PoL designs. |
| Lossless Current-Mode Control | Enables accurate cycle-by-cycle current limiting and fast transient response without sense-resistor losses or board space. |
| Pre-Biased Output Startup | Prevents discharge of existing output voltage during startup - essential for hot-swap and multi-rail sequencing in servers and telecom systems. |
| External Loop Compensation | Supports Type-2 or Type-3 networks - allows optimization for ceramic-capacitor-based outputs and varying load dynamics. |
| Programmable Switching Frequency | 200–600 kHz range via single RT resistor - balances inductor size, efficiency, and EMI compliance for diverse applications. |
| Thermally Enhanced MLP Package | 5×6 mm footprint with three thermal pads achieves θJ-PCB = 35°C/W on 4-layer board - sustains full 6 A load at +85°C ambient. |
Applications
| Graphics Card Core Power | Telecom Line Card PoL |
|---|---|
Use Scenario: Delivering tightly regulated 0.8–1.2 V at up to 6 A to GPU cores in PCIe-based graphics cards with dynamic load steps. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing point-of-load conversion from 12 V intermediate bus. Use Value: High peak efficiency (>95%) minimizes thermal load on compact PCBs; pre-biased startup avoids output collapse during hot-plug events. | Use Scenario: Generating 3.3 V or 5 V from 12 V or 24 V backplane for DSPs, FPGAs, and interface ICs on telecom line cards. IC Role / Device Role / Timing Role: Integrated buck converter managing transient-heavy loads with programmable frequency for EMI filtering. Use Value: External compensation and feedforward (RAMP pin) ensure stability across wide input variation and rapid load changes typical in packet-processing systems. |
| Server Memory I/O Supply | Industrial Computing SoC Rail |
Use Scenario: Powering DDR4/DDR5 memory I/O rails requiring 1.2 V or 1.8 V at up to 6 A with strict ripple and sequencing requirements. IC Role / Device Role / Timing Role: High-efficiency, low-noise buck regulator with PGOOD signaling for system health monitoring. Use Value: 1% reference accuracy and programmable current limit ensure compliance with JEDEC voltage tolerance specs under full load and temperature extremes. | Use Scenario: Supplying 1.8 V or 3.3 V to ARM-based SoCs in ruggedized industrial controllers with extended temperature operation. IC Role / Device Role / Timing Role: Robust PoL regulator with comprehensive protection suite for unattended operation in harsh environments. Use Value: Over-temperature (155°C shutdown), over-voltage (115% VOUT), and under-voltage (73% VOUT) protections prevent field failures due to cooling loss or input anomalies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2451DT-LF-Z | 3–36 V input, 0.8–25 V output, 0.6 A max; smaller 8-pin SOIC package; no pre-biased startup or RAMP feedforward. | Suitable for lower-current, cost-sensitive industrial supplies - lacks thermal robustness and advanced control features of FAN2106MPX. | Select when output current ≤0.6 A and design prioritizes footprint over performance headroom. |
| TPS54620RGYT | 4.5–17 V input, 0.6–15 V output, 6 A max; 16-pin QFN; includes PMBus interface and digital loop compensation. | Targeted at programmable power systems requiring telemetry and adaptive control - adds complexity and cost versus FAN2106MPX's analog simplicity. | Select when digital monitoring, remote configuration, or tighter transient response via digital loop tuning is required. |
Compared with MP2451DT-LF-Z and TPS54620RGYT, the FAN2106MPX delivers higher current density in a thermally optimized MLP package, supports wider input range (3–24 V), and offers analog design flexibility via external compensation and feedforward - making it optimal for high-reliability, high-efficiency PoL applications where programmability and ultra-low current are not primary requirements.
Availability
FAN2106MPX is available at Aetrix Electronics and suitable for graphics card core power, telecom line card point-of-load regulation, and server memory I/O supply requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for FAN2106MPX 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and edge applications.
The FAN2106MPX belongs to ON Semiconductor's integrated power stage regulator product line, designed specifically for high-current, high-efficiency point-of-load conversion in space-constrained computing and communications infrastructure.
FAQ
What is the maximum output voltage supported by the FAN2106MPX?
The FAN2106MPX supports an output voltage range from 0.8 V up to 80% of the input voltage (VIN). With a maximum VIN of 24 V, this yields a theoretical maximum output of 19.2 V. However, practical limits depend on thermal design and MOSFET RDS(ON) derating - for outputs above 5 V, current rating may require de-rating based on ambient temperature and PCB layout.
Does the FAN2106MPX support startup into a pre-biased output?
Yes, the FAN2106MPX supports startup on a pre-biased output. It prevents the low-side MOSFET from conducting in full synchronous mode until the internal soft-start ramp reaches ~95% of the 0.8 V reference (~0.76 V), avoiding discharge of the existing output voltage - a critical feature for hot-swap and multi-rail sequencing in telecom and server applications.
How is the switching frequency set on the FAN2106MPX?
The switching frequency of the FAN2106MPX is set by an external resistor (RT) connected between the R(T) pin and AGND. Using the formula fSW ≈ 135/(RT − 65) kHz (with RT in kΩ), a 30 kΩ resistor yields ~500 kHz. The device operates from 200 kHz to 600 kHz; RT must not be left open, as the regulator will not start without it.
What protections are built into the FAN2106MPX?
The FAN2106MPX includes over-current (16-cycle latched fault), over-voltage (115% VOUT), under-voltage (73% VOUT), over-temperature (155°C shutdown with 30°C hysteresis), and shorted high-side MOSFET detection. All protections operate autonomously without external components, and OV/short-circuit protection remains active during soft-start.
Can the FAN2106MPX use all-ceramic output capacitors?
Yes, the FAN2106MPX is explicitly designed to accept all-ceramic output capacitors. Its current-mode control architecture and external compensation capability provide stable operation with low-ESR ceramic capacitors - enabling compact, high-frequency designs without electrolytic or tantalum components.
FAN2106MPX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- TinyBuck®
- Package/Case:
- 25-WQFN 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):
- 3V
- Voltage - Input (Max):
- 24V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 19.2V
- Current - Output:
- 6A
- Frequency - Switching:
- 200kHz ~ 600kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -10°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 25-MLP (6x5)
FAN2106MPX FAQ
1.How can I place an order for FAN2106MPX through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN2106MPX 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 FAN2106MPX reliable?
The price and inventory of FAN2106MPX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN2106MPX is usually 5 days.
3.What payment methods are accepted for FAN2106MPX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN2106MPX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN2106MPX?
FAN2106MPX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN2106MPX 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 FAN2106MPX?
For technical support, including FAN2106MPX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN2106MPX requirements.
6.How does Aetrix verify that FAN2106MPX is sourced from the original manufacturer or authorized distributors?
All FAN2106MPX 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 FAN2106MPX meets industry standards.
7.What is the process for return or replacement of FAN2106MPX?
All FAN2106MPX units undergo pre-shipment inspection (PSI). If there is an issue with FAN2106MPX, 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 FAN2106MPX part is unused and in its original packaging.
Return procedure for FAN2106MPX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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