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onsemi FAN251015MNTXG
- Part No.:
- FAN251015MNTXG
- Manufacturer:
- onsemi
- Package:
- 34-PowerWFQFN
- Datasheet:
-
FAN251015MNTXG.pdf
- Description:
- IC REG BUCK ADJ 15A 34WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,737
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Product details
Overview
FAN251015MNTXG from onsemi is a synchronous buck regulator IC with integrated high- and low-side MOSFETs, PMBus 1.3.1 interface, 4.5–18 V input range, 0.5–5.5 V programmable output voltage, and 15 A continuous output current-designed for high-density server and telecom power rails.
For engineers reviewing the FAN251015MNTXG datasheet, pinout, applications, or equivalent options, key selection criteria include its digital telemetry accuracy (±0.7% at 3.3 V), adjustable switching frequency (200 kHz–2.2 MHz), cycle-by-cycle current limiting (25 A peak), thermal shutdown (140 °C default), and WQFN34 5×7 mm package with exposed thermal pad.
Technical Context
The FAN251015MNTXG implements fixed-frequency voltage-mode PWM control with input-voltage feed-forward, enabling stable regulation across wide VIN ranges while maintaining fast transient response. Its differential VOUT sensing (VSEN+, VSEN−) feeds a high-bandwidth error amplifier (GBW = 10 MHz) that drives a ramp-based modulator with 30 ns minimum ON time.
Digital supervision is handled via PMBus 1.3.1: real-time telemetry reports VIN, VOUT, IOUT, and die temperature with ±10% current accuracy and ±5 °C thermal accuracy; protections-including overvoltage (116% VOUT default), undervoltage (75% VOUT), overcurrent (25 A peak), and thermal fault (140 °C)-are fully programmable and support hiccup or latch-off responses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5 V to 18 V - supports 5 V, 12 V, and 15 V intermediate bus architectures without external LDO pre-regulation. |
| Continuous Output Current | 15 A - delivered with internal 3.7 mΩ high-side and 1.9 mΩ low-side MOSFETs, enabling single-chip 50 W+ point-of-load conversion. |
| Output Voltage Accuracy | ±0.7% at 3.3 V - ensures tight regulation for CPU/GPU core rails and FPGA I/O supplies under full load and temperature variation. |
| Switching Frequency | 200 kHz to 2.2 MHz - adjustable via PMBus to optimize EMI filtering, inductor size, and efficiency trade-offs per application. |
| PMBus Compliance | PMBus 1.3.1 - enables full digital configuration, telemetry readback, and fault logging in standards-compliant power management systems. |
| Thermal Shutdown Threshold | 140 °C - triggers immediate shutdown with 15 °C hysteresis to protect silicon integrity during sustained overload or airflow loss. |
| Efficiency Peak | Over 96% - achieved at mid-load (e.g., 12 V → 3.3 V/10 A) due to low RDS(on) MOSFETs and optimized gate drive architecture. |
Pinout & Package
Package: WQFN34 5×7 mm, 0.5 mm pitch, exposed thermal pad (Case 510CL). Thermal resistance: RJA = 14.6 °C/W, RJC = 1.5 °C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVIN (Pins 1,2,3,34) | Power Input | High-side MOSFET drain connection; must be decoupled with bulk capacitor near pins to minimize switching loop inductance. |
| PH (Pin 4) | Power Return | Internally connected to SW node; provides return path for boot capacitor charge transfer during freewheeling interval. |
| BOOT (Pin 6) | Gate Drive Supply | Supplies high-side driver; requires 0.1 μF ceramic capacitor between BOOT and PH to sustain gate turn-on under heavy load. |
| GND (Pins 7,32,33) | Analog & Power Ground | Common reference for FB, COMP, and telemetry; PGND pins (32,33) tie low-side MOSFET source and must be routed to thermal pad. |
| FB (Pin 8) | Voltage Feedback Input | Inverting input of error amplifier; used with external resistor divider to set nominal VOUT (0.5–5.5 V range). |
| PG (Pin 13) | Power Good Output | Open-drain signal asserting when VOUT is within ±10% of target (configurable thresholds); critical for system sequencing. |
| ADDR (Pin 14) | PMBus Address | Resistor-programmable pin enabling 14 unique PMBus addresses (00h–0Dh offset) for multi-rail monitoring on shared bus. |
| VSET (Pin 15) | VOUT Pre-set | Resistor-programmable pin offering 15 factory-calibrated output voltages (e.g., 0.6 V to 5 V); overridden by PMBus if needed. |
| SCL/SDA (Pins 19,20) | PMBus Interface | Standard I²C-compatible bidirectional bus (up to 400 kHz) supporting telemetry readback, configuration, and fault logging. |
| EN (Pin 21) | Enable Control | Logic-level input (1.22 V threshold) enabling/disabling regulation; also serves as PMBus-controlled enable/disable command target. |
Key Features
| Feature | Design Value |
|---|---|
| Differential VOUT Sensing | VSEN+/VSEN− inputs reject PCB trace IR drop and noise, enabling accurate remote sensing at load point for <±0.7% regulation. |
| Programmable Cycle-by-Cycle Current Limit | 25 A peak limit (adjustable 1–31 A) with 50 ns blanking window prevents false triggering during MOSFET switching transitions. |
| Digital Telemetry Accuracy | VOUT reported with ±2%, IOUT with ±10%, and temperature with ±5 °C - sufficient for closed-loop margining and health monitoring. |
| Configurable Protection Responses | Per-protection fault modes (hiccup/latch-off/ignore) and delay timers (0–10 ms) allow tailoring safety behavior to system-level requirements. |
| Internal Boot Diode | Integrated diode eliminates need for external bootstrap diode, reducing BOM count and layout complexity in compact designs. |
Applications
| Server VR13/VR14 Core Rail | Telecom Baseband Power |
|---|---|
Use Scenario: Delivering tightly regulated 1.0 V/12 A to ASICs in 1U rack servers with strict PMBus compliance and telemetry logging requirements. IC Role / Device Role / Timing Role: Primary point-of-load regulator with digital supervision, replacing discrete controller + DrMOS solutions. Use Value: Reduces component count by integrating MOSFETs and PMBus interface, while enabling real-time current/voltage margining per VR14 spec. |
Use Scenario: Generating 3.3 V/10 A for FPGA and DSP subsystems in 5G radio units where thermal density and remote diagnostics are critical. IC Role / Device Role / Timing Role: High-efficiency buck converter with synchronized switching (via SYNC pin) to minimize conducted EMI in dense RF environments. Use Value: Achieves >95% efficiency at full load and supports thermal warning alerts before throttling, extending field reliability. |
| High-Density GPU Memory Supply | Industrial Edge AI Module |
Use Scenario: Providing 0.8 V/15 A to GDDR6 memory banks in edge inference accelerators with minimal board area and no external sense resistors. IC Role / Device Role / Timing Role: Digitally programmable buck regulator using VSET resistor for initial voltage setting and PMBus for dynamic scaling. Use Value: Eliminates external current-sense shunt and reduces footprint vs. controller+external MOSFET solutions, easing thermal design. |
Use Scenario: Powering ARM-based SoCs and AI accelerators in fanless industrial gateways requiring robust overtemperature and overvoltage protection. IC Role / Device Role / Timing Role: Fault-tolerant power stage with configurable hiccup mode and 160 °C thermal shutdown umbrella. Use Value: Prevents catastrophic failure during ambient temperature excursions up to 85 °C, with telemetry data logged for predictive maintenance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP8772GQ-Z (Monolithic Power) | 4.5–18 V input, 12 A output, I²C interface only (not PMBus 1.3.1); lacks differential sensing and telemetry accuracy specs. | No built-in VOUT margining or programmable hiccup timing; limited protection configurability vs. FAN251015MNTXG. | Select when PMBus telemetry and fine-grained fault response are not required, and cost sensitivity outweighs digital supervision needs. |
| TPS546D24RQFT (Texas Instruments) | 4.5–18 V input, 60 A scalable (with external FETs), PMBus 1.3 compliant; requires external high-side/low-side MOSFETs. | Higher current capability but larger solution size and higher BOM cost; no integrated power stage. | Select when >15 A output or multi-phase scalability is required; FAN251015MNTXG preferred for space-constrained 15 A single-phase designs. |
Compared with MP8772GQ-Z, FAN251015MNTXG delivers superior digital supervision depth and tighter VOUT accuracy; versus TPS546D24RQFT, it trades scalability for integration density and lower system-level component count in fixed 15 A applications.
Availability
FAN251015MNTXG is available at Aetrix Electronics and suitable for server VR13/VR14 core rails, telecom baseband power supplies, and high-density GPU memory applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for FAN251015MNTXG 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
onsemi is a global semiconductor supplier focused on energy-efficient innovation, delivering power management, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and IoT markets.
The FAN251015MNTXG belongs to onsemi's FAN2510xx digital POL regulator family, engineered for high-efficiency, digitally supervised point-of-load conversion in space-constrained, thermally demanding infrastructure equipment.
FAQ
What is the maximum continuous output current supported by the FAN251015MNTXG?
The FAN251015MNTXG supports 15 A continuous output current with internal MOSFETs. This rating assumes proper PCB layout (2 oz copper, thermal pad soldered), ambient temperature ≤125 °C, and airflow per datasheet thermal characterization. Derating applies above 85 °C ambient or with reduced copper area. The FAN251015MNTXG achieves this with 3.7 mΩ high-side and 1.9 mΩ low-side RDS(on) values.
Does the FAN251015MNTXG require an external bootstrap diode?
No, the FAN251015MNTXG integrates an internal bootstrap diode, eliminating the need for an external component. This simplifies layout and reduces BOM count. The BOOT pin (Pin 6) must still be decoupled with a 0.1 μF ceramic capacitor to PH (Pin 4) to ensure reliable high-side gate drive during continuous conduction mode operation of the FAN251015MNTXG.
How is the PMBus address configured on the FAN251015MNTXG?
The PMBus address of the FAN251015MNTXG is set using a resistor between the ADDR pin (Pin 14) and GND. A 1% tolerance resistor selects one of 14 offset addresses (00h–0Dh), which combine with a programmable base address stored in MTP. For example, a 1.3 kΩ resistor sets offset 01h. The FAN251015MNTXG datasheet Table 1 lists all valid resistor values and resulting addresses.
Can the FAN251015MNTXG operate without PMBus communication enabled?
Yes, the FAN251015MNTXG operates autonomously without PMBus. Output voltage can be preset via the VSET pin (Pin 15) using a resistor, and basic functions (enable, soft-start, protections) work immediately after power-up. PMBus is optional for telemetry, dynamic reconfiguration, and advanced fault logging-the FAN251015MNTXG remains fully functional as an analog-controlled buck regulator if SCL/SDA lines are left unconnected.
What thermal protection features does the FAN251015MNTXG provide?
The FAN251015MNTXG provides two-tier thermal protection: a 115 °C warning threshold (programmable 70–150 °C) triggers telemetry alerts, and a 140 °C fault threshold (programmable 80–160 °C) initiates shutdown. An absolute 160 °C thermal shutdown umbrella (TSHDN) forces immediate power-down regardless of programmed settings. All thresholds are reported via PMBus and have ±5 °C accuracy across −40 °C to 125 °C junction range.
FAN251015MNTXG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 34-PowerWFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 0.5V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 15A
- Frequency - Switching:
- 200kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 34-WQFN (5x7)
FAN251015MNTXG FAQ
1.How can I place an order for FAN251015MNTXG through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN251015MNTXG 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 FAN251015MNTXG reliable?
The price and inventory of FAN251015MNTXG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN251015MNTXG is usually 5 days.
3.What payment methods are accepted for FAN251015MNTXG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN251015MNTXG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN251015MNTXG?
FAN251015MNTXG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN251015MNTXG 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 FAN251015MNTXG?
For technical support, including FAN251015MNTXG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN251015MNTXG requirements.
6.How does Aetrix verify that FAN251015MNTXG is sourced from the original manufacturer or authorized distributors?
All FAN251015MNTXG 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 FAN251015MNTXG meets industry standards.
7.What is the process for return or replacement of FAN251015MNTXG?
All FAN251015MNTXG units undergo pre-shipment inspection (PSI). If there is an issue with FAN251015MNTXG, 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 FAN251015MNTXG part is unused and in its original packaging.
Return procedure for FAN251015MNTXG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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