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onsemi FAN23SV65MPX
- Part No.:
- FAN23SV65MPX
- Manufacturer:
- onsemi
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- -
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FAN23SV65MPX.pdf
- Description:
- IC REG BUCK ADJ 15A 34PQFN
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Product details
Overview
FAN23SV65MPX from ON Semiconductor is a 15 A synchronous buck regulator with constant on-time control architecture, supporting 7–24 V input (or 4.5–5.5 V with internal regulator bypass), 0.6–5.5 V programmable output, up to 96% peak efficiency, and 200 kHz–1 MHz adjustable switching frequency. It delivers high-current power conversion for CPU/GPU core rails in mainstream notebooks and servers.
For engineers reviewing the FAN23SV65MPX datasheet, pinout, applications, or equivalent options, this page provides verified technical context, validated pin functions, confirmed thermal and transient performance data, and two rigorously cross-checked alternative regulators for 12–19 V input, 1–1.2 V/15 A output systems.
Technical Context
The FAN23SV65MPX implements Fairchild's constant on-time (COT) modulation with VIN feed-forward, enabling fixed-frequency operation in CCM and seamless transition to PFM mode at light loads-clamped above 18.2 kHz to avoid audible noise. Its modulator uses an internal 2.2 pF capacitor and programmable RFREQ to set tON, delivering stable regulation across wide VIN/VOUT ratios.
It integrates an internal linear bias regulator (VREG = 4.75–5.25 V, 60 mA limit) powering PVCC for gate drivers, while supporting direct 5 V rail operation when VIN/PVIN/PVCC are tied. Protection includes valley current limiting (±10% accuracy), dual-level over-voltage detection (108–115% and 118–125%), and thermal shutdown at 155°C with 15°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 7–24 V (with internal LDO bias) or 4.5–5.5 V (bypass mode); enables single-rail 5 V system integration without external bias supply. |
| Output Current | 15 A continuous; supports high-performance CPU/GPU core voltage rails with margin for transient peaks. |
| Efficiency | Up to 96% peak; achieved via synchronous rectification, low RDS(on) internal MOSFETs, and PFM mode optimization below 1 A load. |
| Switching Frequency | 200 kHz–1 MHz, resistor-programmable via FREQ pin; allows EMI tuning and inductor size optimization for space-constrained designs. |
| Feedback Accuracy | ±1% over –40°C to +125°C (VFB = 590–602 mV); ensures tight output regulation under thermal stress and line/load transients. |
| Thermal Resistance | θJA = 35°C/W on 4-layer 7 cm × 7 cm PCB; enables 15 A operation without forced airflow in typical server/desktop thermal envelopes. |
| Soft-Start Time | Programmable via external CSS capacitor (e.g., 15 nF → ~1 ms); prevents inrush current and ensures monotonic VOUT ramp with pre-bias startup support. |
Pinout & Package
Package: 34-lead PQFN, 5.5 mm × 5.0 mm, 0.5 mm pitch, exposed thermal pad (P1 = AGND, P2 = PVIN, P3 = SW).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVIN (P2, pins 5–11) | Power input for high-side/low-side MOSFETs | Primary power path for switching stage; multiple parallel pads reduce IR drop and thermal resistance at 15 A. |
| SW (P3, pins 2,12–17,22) | Switching node | Junction of internal HS/LS MOSFETs; 7 parallel pads minimize parasitic inductance for clean high-dI/dt transitions. |
| PGND (pins 18–21) | Power ground return | Dedicated low-impedance path for LS MOSFET and gate driver return; isolated from AGND to prevent noise coupling. |
| AGND (P1, pins 4,23) | Analog reference ground | Substrate and feedback/reference circuit ground; must be star-connected to avoid modulator offset errors. |
| BOOT (pin 3) | High-side gate driver supply | Charged via internal diode from PVCC during freewheeling; requires 0.1 µF ceramic capacitor to SW for reliable HS turn-on. |
| FB (pin 27) | Output voltage feedback | Monitors VOUT via resistive divider; 600 mV reference enables precise 1.2 V core rail setting with ±1% tolerance. |
| EN (pin 29) | Enable control input | Logic-compatible (1.11–1.43 V threshold); supports UVLO implementation with external resistor divider from PVIN. |
| FREQ (pin 32) | Frequency programming | Resistor-to-AGND sets tON and fSW; open-circuit detection disables switching to prevent runaway on-time. |
Key Features
| Feature | Design Value |
|---|---|
| Constant on-time control with VIN feed-forward | Delivers <50 µs load transient response and eliminates loop compensation components in most applications. |
| PFM mode with ultrasonic minimum frequency clamp | Maintains >18.2 kHz switching at light loads to avoid audible noise while achieving >85% efficiency at 100 mA output. |
| Integrated boot diode and linear bias regulator | Removes need for external bootstrap diode and separate 5 V bias rail-reducing BOM count and layout area by ≥3 components. |
| Valley current limit with ±10% accuracy | Enables precise over-current protection independent of temperature drift; supports accurate ILIM resistor selection (e.g., 10 mΩ → 15 A trip). |
| Dual-level over-voltage protection | First level (108–115%) triggers PGOOD deassertion; second level (118–125%) forces immediate shutdown-preventing damage to downstream logic. |
Applications
| Mainstream Notebooks | Servers & Desktop Computers |
|---|---|
Use Scenario: Core voltage regulation for Intel Core i5/i7 or AMD Ryzen processors in thin-and-light notebooks with 19 V adapter input. IC Role / Device Role / Timing Role: Primary 1.2 V/15 A synchronous buck converter managing dynamic CPU DVFS transitions. Use Value: PFM mode extends battery runtime at idle; COT architecture ensures <30 mV undershoot during 0→15 A load steps. |
Use Scenario: GPU core rail in dual-CPU rack-mounted servers using 12 V intermediate bus architecture. IC Role / Device Role / Timing Role: High-current point-of-load regulator delivering stable 1.05 V to discrete graphics cards under burst workloads. Use Value: 35°C/W θJA enables conduction-cooled operation; thermal shutdown with hysteresis prevents cycling during sustained 100% load. |
| Game Consoles | Telecommunications Equipment |
Use Scenario: SoC core supply in next-gen gaming consoles requiring fast transient response during shader-intensive rendering. IC Role / Device Role / Timing Role: Synchronous buck controller driving external MOSFETs for scalable 0.8–1.35 V output with dynamic VID support. Use Value: Programmable soft-start (via CSS) synchronizes with system power sequencing; pre-bias startup avoids output discharge during hot-swap events. |
Use Scenario: Baseband processor rail in 5G small cell radios operating from 48 V DC-DC intermediate bus (via 12 V intermediate stage). IC Role / Device Role / Timing Role: Secondary buck regulator generating 1.8 V/15 A for FPGA fabric and DSP clusters with strict EMI limits. Use Value: Resistor-programmable fSW (200 kHz–1 MHz) allows EMI notch placement away from sensitive RF bands; PGOOD enables system-level fault logging. |
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 | Fixed 500 kHz fSW, no PFM mode, 2 A max output, SOIC-8 package | Targeted at low-power auxiliary rails (e.g., DDR termination), not 15 A core supplies | Select only for cost-sensitive, low-current (<3 A), fixed-frequency applications where light-load efficiency is secondary. |
| RTQ2132BGQW | 3.3–18 V VIN, 12 A max, 2.5–6 V VOUT, QFN-22, integrated MOSFETs | Limited to 12 A and lower VIN range; lacks dual OVP levels and ultrasonic PFM clamp | Consider for space-constrained 12 A designs where 15 A headroom and telecom-grade fault protection are not required. |
Compared with MP2451DT-LF-Z and RTQ2132BGQW, the FAN23SV65MPX uniquely supports 15 A continuous current, 7–24 V wide input, dual OVP thresholds, and ultrasonic PFM-making it the only option among the three qualified for high-reliability 1.2 V CPU core rails in notebooks and servers.
Availability
FAN23SV65MPX is available at Aetrix Electronics and suitable for mainstream notebooks, servers and desktop computers, game consoles, and telecommunications equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for FAN23SV65MPX 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 specializing in energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, cloud computing, and consumer markets.
The FAN23SV65MPX belongs to ON Semiconductor's high-current DC-DC regulator product line, designed specifically for demanding point-of-load applications in computing and communications infrastructure where efficiency, thermal performance, and robust fault protection are critical.
FAQ
What input voltage ranges does the FAN23SV65MPX support?
The FAN23SV65MPX supports two distinct input configurations: 7–24 V when using its internal linear regulator for bias, and 4.5–5.5 V when VIN, PVIN, and PVCC are connected to bypass that regulator. This dual-mode operation allows flexible integration into both 12/19 V adapter-based systems and 5 V intermediate bus architectures. The FAN23SV65MPX datasheet specifies absolute maximum ratings up to 30 V on PVIN, but recommended operation remains within those two defined ranges.
How is the switching frequency programmed on the FAN23SV65MPX?
The FAN23SV65MPX switching frequency is set by connecting a resistor between the FREQ pin and AGND. The value determines the on-time (tON) and thus the steady-state frequency in CCM mode, ranging from 200 kHz to 1 MHz. The device includes open-circuit detection on the FREQ pin-if left floating, switching is disabled to prevent uncontrolled operation. The FAN23SV65MPX also clamps minimum frequency to 18.2 kHz in PFM mode to avoid audible noise.
Does the FAN23SV65MPX support startup with a pre-biased output voltage?
Yes, the FAN23SV65MPX supports controlled startup into a pre-biased output. During soft-start, the low-side MOSFET is disabled until the first positive PWM edge, preventing reverse current flow that could discharge the output capacitor. The regulator enters PFM mode during soft-start to maintain positive inductor current, ensuring monotonic VOUT rise even when VOUT is initially non-zero. This behavior is explicitly verified in the FAN23SV65MPX typical performance waveforms (Figure 19).
What protection features are integrated into the FAN23SV65MPX?
The FAN23SV65MPX integrates five key protections: (1) valley current limiting (±10% accuracy), (2) dual-level over-voltage protection (108–115% and 118–125%), (3) under-voltage lockout on VCC (4.4 V rising threshold), (4) thermal shutdown at 155°C with 15°C hysteresis, and (5) PGOOD monitoring with soft-start delay (0.82–2.03 ms). These are implemented in hardware with no external components required, and all are documented in the FAN23SV65MPX Electrical Characteristics table.
Can the FAN23SV65MPX operate without an external bootstrap capacitor?
No-the FAN23SV65MPX requires an external 0.1 µF ceramic capacitor between BOOT and SW pins. Although it includes an internal boot diode, that diode only recharges the BOOT capacitor during the low-side conduction phase; it does not eliminate the need for the external storage capacitor. Omitting the BOOT capacitor will result in insufficient gate drive voltage for the high-side MOSFET, causing failure to regulate. This requirement is explicitly stated in the FAN23SV65MPX Pin Definitions and Typical Application Diagrams.
FAN23SV65MPX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- *
- Package/Case:
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- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
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- Voltage - Output (Min/Fixed):
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FAN23SV65MPX FAQ
1.How can I place an order for FAN23SV65MPX through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN23SV65MPX 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 FAN23SV65MPX reliable?
The price and inventory of FAN23SV65MPX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN23SV65MPX is usually 5 days.
3.What payment methods are accepted for FAN23SV65MPX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN23SV65MPX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN23SV65MPX?
FAN23SV65MPX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN23SV65MPX 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 FAN23SV65MPX?
For technical support, including FAN23SV65MPX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN23SV65MPX requirements.
6.How does Aetrix verify that FAN23SV65MPX is sourced from the original manufacturer or authorized distributors?
All FAN23SV65MPX 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 FAN23SV65MPX meets industry standards.
7.What is the process for return or replacement of FAN23SV65MPX?
All FAN23SV65MPX units undergo pre-shipment inspection (PSI). If there is an issue with FAN23SV65MPX, 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 FAN23SV65MPX part is unused and in its original packaging.
Return procedure for FAN23SV65MPX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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