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onsemi FAN2310MPX
- Part No.:
- FAN2310MPX
- Manufacturer:
- onsemi
- Package:
- -
- Datasheet:
-
FAN2310MPX.pdf
- Description:
- IC REG BUCK ADJ 10A 34PQFN
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Inventory:3,556
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Product details
Overview
FAN2310MPX from ON Semiconductor (formerly Fairchild) is a 10 A synchronous buck regulator IC designed for high-efficiency DC-DC conversion in power supply rails. It operates from 4.5 V to 18 V input, delivers adjustable output from 0.6 V to 5.5 V, and achieves >96% peak efficiency using constant on-time control with PFM mode at light loads-used in server VRMs and telecom point-of-load supplies.
For engineers reviewing the FAN2310MPX datasheet, pinout, applications, or equivalent options, key selection considerations include its programmable 200 kHz–1.5 MHz switching frequency, ±1% reference accuracy over temperature, valley-current limit adjustability via ILIM pin, thermal shutdown with 15°C hysteresis, and integrated boot diode enabling single-MOSFET external design.
Technical Context
The FAN2310MPX implements constant on-time (COT) modulation with VIN feed-forward, delivering stable switching frequency in CCM and variable-frequency PFM operation in DCM. Its zero-crossing detection enables seamless transition into ultrasonic PFM mode below audible range, reducing light-load losses without compromising transient response.
Protection architecture includes dual-level over-voltage detection (108–115% and 118–125% of VREF), under-voltage lockout on VCC (4.4 V rising threshold), cycle-by-cycle valley-current limiting, and thermal shutdown at 155°C with 140°C restart hysteresis-ensuring robust fault handling in high-density computing and base station applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5 V to 18 V: Supports wide-input industrial and telecom supply rails without pre-regulation. |
| Output Current | 10 A continuous: Delivers full-rated load with thermal resistance θJA = 35°C/W on standard 4-layer PCB. |
| Reference Accuracy | ±1% over –40°C to +125°C: Enables precise output regulation without external trimming in temperature-varying environments. |
| Switching Frequency | 200 kHz to 1.5 MHz: Programmable via resistor on FREQ pin; allows optimization for size (high-f) or EMI (low-f). |
| Efficiency Peak | >96%: Achieved at mid-load with 12 V input/1.2 V output; reduces thermal burden in compact enclosures. |
| Soft-Start Control | Programmable via external capacitor on SS pin: Provides monotonic startup and ratiometric tracking capability. |
| PGOOD Thresholds | UV: 86–92% VREF; OV Level 1: 108–115% VREF; OV Level 2: 118–125% VREF: Enables system-level fault isolation and graceful shutdown sequencing. |
Pinout & Package
Package: 34-lead PQFN, 5.5 mm × 5.0 mm, exposed thermal pad. Designed for high-current routing and low-inductance layout with multiple PVIN, SW, and PGND pads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVIN (Pins 5–11, P2) | Power input for high-side MOSFET | Dedicated high-current path for input supply; multiple parallel pins reduce IR drop and thermal stress. |
| SW (Pins 2, 12–17, 22, P3) | Switching node | High-dV/dt node connecting HS/LS MOSFETs; requires minimized loop area to suppress EMI. |
| BOOT (Pin 3) | High-side gate driver supply | Charged via internal diode from PVCC; external BOOT–SW capacitor enables N-channel HS drive. |
| ILIM (Pin 24) | Valley current limit setpoint | Resistor-to-SW sets accurate, temperature-compensated current limit (±10% accuracy at 12 A). |
| FB (Pin 27) | Feedback voltage sensing | Monitors output via resistive divider; 596 mV nominal trip point enables precise VOUT programming. |
| PGOOD (Pin 30) | Open-drain power-good indicator | Signals valid regulation (125 Ω pull-down); asserts low during UV/OV/OTP faults for system monitoring. |
Key Features
| Feature | Design Value |
|---|---|
| PFM with Ultrasonic Mode | Eliminates audible noise by clamping minimum frequency to 18.2–32.7 kHz; maintains efficiency down to µA loads. |
| Internal Boot Diode | Removes need for external bootstrap diode; simplifies layout and improves reliability in high-reliability systems. |
| Programmable Soft-Start | Enables controlled ramp-up and ratiometric tracking across multiple rails using external CSS capacitor. |
| Dual-Level Over-Voltage Protection | First level (108–115% VREF) disables both MOSFETs; second level (118–125% VREF) forces LS-on for rapid discharge-protecting downstream ICs. |
| Thermal Hysteresis | 15°C gap between 155°C shutdown and 140°C restart prevents thermal cycling during overload recovery. |
Applications
| Server VRMs | Telecom Base Stations |
|---|---|
Use Scenario: Regulating 1.2 V core supply for multi-core Xeon processors in 1U rack servers with strict thermal envelope. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing 10 A load with fast load-transient response (<50 µs recovery). Use Value: Constant on-time control ensures <20 mV output deviation during 0–10 A step load, minimizing CPU throttling. | Use Scenario: Point-of-load conversion for FPGA and ASIC rails in macrocell base station power modules. IC Role / Device Role / Timing Role: High-efficiency buck regulator operating from 12 V intermediate bus to generate 3.3 V/5 V auxiliary supplies. Use Value: >96% peak efficiency and PFM mode reduce heat generation in sealed outdoor enclosures. |
| Game Console SoCs | Enterprise Storage Controllers |
Use Scenario: Dynamic voltage scaling for GPU and CPU cores in next-gen gaming consoles with burst-mode workloads. IC Role / Device Role / Timing Role: Adaptive buck regulator supporting rapid VID changes via I²C-controlled DAC feedback. Use Value: Programmable soft-start and PGOOD enable coordinated rail sequencing with companion PMICs. | Use Scenario: Powering NVMe SSD controllers and PCIe switch logic in enterprise storage arrays requiring high reliability. IC Role / Device Role / Timing Role: Fault-tolerant buck converter with dual OVP levels and thermal shutdown protecting flash memory integrity. Use Value: Second-level OVP (122% VREF) triggers forced LS conduction to clamp overshoot within JEDEC-compliant limits. |
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 | 4.5–18 V input, 6 A max, fixed 500 kHz fSW, no PFM mode, smaller 3×3 mm QFN-12 package | Limited to lower-current applications; lacks ultrasonic PFM and programmable frequency | Select when board space is constrained and light-load efficiency is secondary to cost and footprint. |
| TPS546D24RSAR | 4.5–18 V input, 10 A, PMBus interface, 300 kHz–2 MHz programmable fSW, integrated MOSFETs, higher BOM cost | Supports digital telemetry and dynamic voltage scaling; requires PMBus host controller | Choose when remote monitoring, margining, or adaptive frequency tuning is required in datacenter applications. |
Compared with MP2315DJ-LF-Z and TPS546D24RSAR, the FAN2310MPX offers superior light-load efficiency via ultrasonic PFM and flexible analog programming (frequency, soft-start, current limit), while maintaining lower system cost than fully integrated digital alternatives.
Availability
FAN2310MPX is available at Aetrix Electronics and suitable for server VRMs, telecom base stations, game console SoC power delivery, and enterprise storage controllers requiring stable component supply across extended production lifecycles.
Supply support for FAN2310MPX 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, and communications markets.
The FAN2310MPX belongs to ON Semiconductor's high-current DC-DC regulator product line, engineered for demanding point-of-load applications where efficiency, thermal performance, and robust protection are critical.
FAQ
What is the maximum recommended junction temperature for continuous operation of the FAN2310MPX?
The FAN2310MPX has a maximum recommended junction temperature of +125°C for continuous operation, with thermal shutdown activating at +155°C and automatic restart at +140°C. Its θJA of 35°C/W on a 4-layer PCB allows sustained 10 A output at ambient temperatures up to +85°C with minimal airflow-verified in typical application testing per Rev. 1.11 datasheet Figure 8.
How does the FAN2310MPX implement soft-start, and what external component is required?
The FAN2310MPX uses an internal 10 µA current source to charge an external capacitor on the SS pin, generating a controlled voltage ramp. For a 1 ms startup time, a 15 nF capacitor is required (per Equation 5). During soft-start, on-time is modulated from 50% to 100% of steady-state value, and the regulator is forced into PFM mode to ensure monotonic rise-preventing output discharge during pre-bias conditions.
Can the FAN2310MPX operate with a pre-biased output voltage, and how is this supported?
Yes, the FAN2310MPX supports startup on a pre-biased output. It disables the low-side MOSFET until the first positive PWM edge, preventing reverse current flow. The regulator enters PFM mode during soft-start to maintain positive inductor current, and the SS clamp drops to 40 mV during overload-enabling recovery without output collapse. This behavior is confirmed in Figure 14 and Section "Startup on Pre-Bias" of the datasheet.
What is the function of the ILIM pin on the FAN2310MPX, and how is current limit set?
The ILIM pin on the FAN2310MPX sets the valley-current limit threshold via an external resistor connected between ILIM and SW. With a scale factor KILIM = 142 and temperature coefficient of 4000 ppm/°C, a 10 mΩ sense resistor yields ~12 A limit (±10% accuracy at 25°C). An open-circuit detection circuit disables operation if ILIM is left floating-ensuring safe default behavior in case of resistor failure or omission.
Does the FAN2310MPX require an external bootstrap diode, and why or why not?
No, the FAN2310MPX does not require an external bootstrap diode because it integrates a low-forward-voltage (0.6 V typ.) internal diode between PVCC and BOOT. This diode charges the BOOT–SW capacitor during the low-side conduction phase, enabling reliable high-side N-MOSFET drive without additional components-reducing BOM count and layout complexity while improving long-term reliability.
FAN2310MPX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
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- Number of Outputs:
- -
- Voltage - Input (Min):
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- Voltage - Input (Max):
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- Voltage - Output (Min/Fixed):
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- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
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- Synchronous Rectifier:
- -
- Operating Temperature:
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- Grade:
- -
- Qualification:
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- Mounting Type:
- -
- Supplier Device Package:
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FAN2310MPX FAQ
1.How can I place an order for FAN2310MPX through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN2310MPX 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 FAN2310MPX reliable?
The price and inventory of FAN2310MPX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN2310MPX is usually 5 days.
3.What payment methods are accepted for FAN2310MPX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN2310MPX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN2310MPX?
FAN2310MPX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN2310MPX 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 FAN2310MPX?
For technical support, including FAN2310MPX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN2310MPX requirements.
6.How does Aetrix verify that FAN2310MPX is sourced from the original manufacturer or authorized distributors?
All FAN2310MPX 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 FAN2310MPX meets industry standards.
7.What is the process for return or replacement of FAN2310MPX?
All FAN2310MPX units undergo pre-shipment inspection (PSI). If there is an issue with FAN2310MPX, 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 FAN2310MPX part is unused and in its original packaging.
Return procedure for FAN2310MPX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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