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onsemi FAN23SV56MPX
- Part No.:
- FAN23SV56MPX
- Manufacturer:
- onsemi
- Package:
- 34-PowerTFQFN
- Datasheet:
-
FAN23SV56MPX.pdf
- Description:
- IC REG BUCK ADJ 6A 34PQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,969
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Product details
Overview
FAN23SV56MPX from ON Semiconductor is a 6 A synchronous buck regulator with PFM mode and ultrasonic frequency clamping, designed for high-efficiency DC-DC conversion in computing and telecom power rails. It supports 7–24 V input (or 4.5–5.5 V bypass mode), delivers 0.6–5.5 V output, achieves >96% peak efficiency, and operates up to 1.5 MHz switching frequency.
For engineers reviewing the FAN23SV56MPX datasheet, pinout, applications, or equivalent options, this page provides verified technical context, validated pin functions, confirmed light-load PFM behavior with ultrasonic clamping, real-world thermal performance data (θJA = 35°C/W), and two rigorously cross-checked alternative regulators for similar high-current buck applications.
Technical Context
The FAN23SV56MPX implements Fairchild's constant on-time (COT) control architecture with VIN feed-forward, enabling stable operation across wide input ranges without loop compensation. Its modulator uses a fixed tON (programmable via FREQ pin resistor) and minimum tOFF of 320 ns to ensure reliable valley-current sensing and PFM entry.
PFM mode activates during discontinuous conduction mode (DCM) at light loads, reducing switching frequency while maintaining ultrasonic clamping ≥18.2 kHz to avoid audible noise. 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 (internal LDO bias) or 4.5–5.5 V (bypass mode); enables single-rail 5 V system integration without external bias supply. |
| Continuous Output Current | 6 A; validated per datasheet test conditions (TJ ≤ 125°C, 4-layer PCB, no airflow). |
| Peak Efficiency | >96%; achieved at mid-load with 12 V input and 1.2 V output, critical for thermal management in dense compute modules. |
| Switching Frequency Range | 200 kHz–1.5 MHz; programmable via resistor on FREQ pin, allowing EMI optimization and inductor size trade-offs. |
| FB Reference Voltage | 596 mV ±6 mV; precision reference enables accurate 1.2 V output with ±1% regulation over temperature. |
| Thermal Resistance θJA | 35°C/W; measured on 4-layer 7 cm × 7 cm PCB, defines heatsinking requirements for 6 A continuous operation. |
| Ultrasonic Mode Clamp | 18.2–32.7 kHz minimum frequency; prevents audible noise in consumer electronics while preserving light-load efficiency. |
Pinout & Package
Package: 34-lead PQFN, 5.5 mm × 5.0 mm, exposed thermal pad (P1/P2/P3 denote pad groups per datasheet Figure 4).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVIN (Pins 5–11, 22–25) | Power input for high-side/low-side MOSFETs | Dedicated high-current path for power stage; multiple pins reduce IR drop and thermal stress under 6 A load. |
| SW (Pins 2, 12–17, 22) | Switching node | High dv/dt node connecting HS/LS MOSFETs; requires tight layout to minimize EMI and ringing. |
| BOOT (Pin 3) | High-side gate driver supply | Capacitor-coupled supply referenced to SW; internal diode charges BOOT from PVCC during freewheeling. |
| FB (Pin 27) | Output voltage feedback | Connects to resistor divider; 596 mV reference sets output voltage with ±1% accuracy over temperature. |
| EN (Pin 29) | Enable control input | Logic-compatible (1.11–1.43 V threshold); supports UVLO implementation via resistive divider from PVIN. |
| FREQ (Pin 32) | Frequency programming | Resistor-to-AGND sets tON; enables precise frequency selection between 200 kHz and 1.5 MHz. |
| PGOOD (Pin 30) | Open-drain power-good indicator | Signals VOUT within ±11% window; 125 Ω pull-down enables direct interface with microcontroller reset logic. |
Key Features
| Feature | Design Value |
|---|---|
| PFM with Ultrasonic Clamping | Reduces switching frequency at light loads while enforcing ≥18.2 kHz minimum to eliminate audible noise in notebooks and game consoles. |
| Constant On-Time Control | Enables instantaneous line/load transient response without external compensation components, simplifying design for dynamic CPU/GPU rails. |
| Valley Current Limiting | ±10% accuracy over temperature ensures consistent over-current protection across -40°C to +125°C operating range. |
| Dual-Level Over-Voltage Protection | First level (108–115%) triggers PGOOD deassertion; second level (118–125%) forces immediate shutdown, preventing downstream IC damage. |
| Internal Boot Diode | Eliminates need for external bootstrap diode, reducing BOM count and PCB area in space-constrained server VRMs. |
Applications
| Server Core Voltage Regulation | Notebook Main Power Rail |
|---|---|
Use Scenario: Regulating 1.2 V core supply for multi-core Xeon processors under dynamic 0–6 A load transients. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing high-current, low-voltage CPU rail with COT-based fast transient response. Use Value: 96% peak efficiency and 35°C/W θJA enable compact thermal design in 1U servers; ultrasonic PFM avoids acoustic interference in datacenter environments. |
Use Scenario: Delivering 1.05 V GPU voltage in mainstream notebooks with strict EMI and acoustic noise limits. IC Role / Device Role / Timing Role: High-efficiency step-down regulator operating in PFM mode during idle/sleep states to extend battery life. Use Value: Ultrasonic frequency clamp (≥18.2 kHz) eliminates audible coil whine; 6 A rating supports discrete GPU power demands without derating. |
| Telecom Base Station PSU | Storage Controller Power |
Use Scenario: Generating 3.3 V auxiliary rail for FPGA and SerDes interfaces in LTE/5G remote radio units. IC Role / Device Role / Timing Role: Secondary buck converter with programmable 200 kHz–1.5 MHz frequency to avoid sensitive RF bands. Use Value: Frequency programming via FREQ pin allows EMI tuning; dual OVP levels protect expensive baseband ICs from overvoltage faults. |
Use Scenario: Powering NVMe SSD controllers requiring stable 1.8 V rail with fast load-step response during burst writes. IC Role / Device Role / Timing Role: High-bandwidth buck regulator using COT architecture to maintain <1% output deviation during 0–6 A steps. Use Value: 320 ns minimum off-time ensures accurate valley-current sensing during rapid load changes; soft-start prevents inrush into capacitive SSD loads. |
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/ultrasonic mode; smaller 8-pin SOIC package. | Lacks light-load efficiency optimization and frequency programmability; suitable only for static, medium-current loads. | Select when board space is constrained and load profile is steady-state; not recommended for CPU/GPU rails with dynamic current. |
| TPS546B24RVFR | 6 A, PMBus-enabled, 400 kHz–2 MHz programmable frequency, but requires external compensation and has higher quiescent current (12 mA vs. 1.8 mA). | Supports digital telemetry and margining; adds complexity for analog-only designs. | Choose for systems needing real-time voltage/current monitoring or adaptive frequency tuning; avoid if analog simplicity is prioritized. |
Compared with MP2315DJ-LF-Z and TPS546B24RVFR, the FAN23SV56MPX uniquely combines 6 A capability, ultrasonic PFM, and COT control in a single-chip solution-enabling high efficiency across full load range without external compensation or digital infrastructure.
Availability
FAN23SV56MPX is available at Aetrix Electronics and suitable for server VRMs, notebook GPU power, telecom base station PSUs, and NVMe storage controllers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for FAN23SV56MPX 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 semiconductor supplier specializing in power management, analog, and sensor solutions for automotive, industrial, and computing markets.
The FAN23SV56MPX belongs to ON Semiconductor's high-current synchronous buck regulator product line, engineered specifically for efficient, compact, and thermally robust DC-DC conversion in high-performance computing and communications infrastructure.
FAQ
What input voltage ranges does the FAN23SV56MPX support?
The FAN23SV56MPX supports two distinct input configurations: 7–24 V using its internal linear regulator for bias, or 4.5–5.5 V when VIN, PVIN, and PVCC are connected to bypass the internal regulator. This dual-range capability allows flexible integration in both wide-input industrial systems and tightly regulated 5 V rail architectures. The FAN23SV56MPX datasheet specifies absolute maximum PVIN of 30 V and recommends operation within these ranges for reliability.
How does the ultrasonic mode function in the FAN23SV56MPX?
The FAN23SV56MPX implements ultrasonic mode by clamping the minimum switching frequency to 18.2–32.7 kHz during PFM operation, preventing audible noise generation in sensitive applications like notebooks and game consoles. This is achieved through internal circuitry that forces the low-side MOSFET to turn on and trigger a new cycle if frequency drops below the clamp threshold. The FAN23SV56MPX maintains this behavior across its full operating temperature range (-40°C to +125°C).
What is the purpose of the FREQ pin on the FAN23SV56MPX?
The FREQ pin on the FAN23SV56MPX programs the switching frequency by setting the on-time (tON) of the high-side MOSFET via an external resistor to AGND. This resistor determines the modulator's feed-forward current, enabling precise frequency selection from 200 kHz to 1.5 MHz. The FAN23SV56MPX datasheet provides a lookup table correlating resistor values (e.g., 56.2 kΩ for 500 kHz) to frequency, supporting EMI compliance and inductor optimization.
Does the FAN23SV56MPX include over-voltage protection, and how does it work?
Yes, the FAN23SV56MPX features dual-level over-voltage protection: Level 1 (108–115% of nominal VOUT) asserts PGOOD deactivation, while Level 2 (118–125%) triggers immediate shutdown. Both thresholds are referenced to the FB pin voltage and operate independently of load conditions. This layered protection prevents damage to downstream logic in applications such as server CPU cores and telecom FPGAs where overvoltage events could cause catastrophic failure.
Can the FAN23SV56MPX start up with a pre-biased output voltage?
Yes, the FAN23SV56MPX supports startup on 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 FAN23SV56MPX also forces PFM mode during soft-start to maintain positive inductor current, ensuring monotonic VOUT ramp-up even when the output is initially charged to near-regulation voltage.
FAN23SV56MPX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- TinyBuck®
- Package/Case:
- 34-PowerTFQFN
- 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):
- 7V
- Voltage - Input (Max):
- 24V
- 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)
FAN23SV56MPX FAQ
1.How can I place an order for FAN23SV56MPX through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN23SV56MPX 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 FAN23SV56MPX reliable?
The price and inventory of FAN23SV56MPX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN23SV56MPX is usually 5 days.
3.What payment methods are accepted for FAN23SV56MPX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN23SV56MPX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN23SV56MPX?
FAN23SV56MPX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN23SV56MPX 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 FAN23SV56MPX?
For technical support, including FAN23SV56MPX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN23SV56MPX requirements.
6.How does Aetrix verify that FAN23SV56MPX is sourced from the original manufacturer or authorized distributors?
All FAN23SV56MPX 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 FAN23SV56MPX meets industry standards.
7.What is the process for return or replacement of FAN23SV56MPX?
All FAN23SV56MPX units undergo pre-shipment inspection (PSI). If there is an issue with FAN23SV56MPX, 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 FAN23SV56MPX part is unused and in its original packaging.
Return procedure for FAN23SV56MPX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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