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onsemi FAN23SV20MAMPX
- Part No.:
- FAN23SV20MAMPX
- Manufacturer:
- onsemi
- Package:
- 34-PowerTFQFN
- Datasheet:
-
FAN23SV20MAMPX.pdf
- Description:
- IC REG BUCK ADJ 20A 34PQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,346
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Product details
Overview
FAN23SV20MAMPX from ON Semiconductor is a 20 A synchronous buck regulator IC designed for high-efficiency DC-DC conversion in server and telecom power rails. It delivers up to 20 A continuous output current, supports 7–18 V input (or 4.5–5.5 V with internal regulator bypass), features ±1% reference accuracy over temperature, and achieves >96% peak efficiency using constant on-time control architecture.
For engineers reviewing the FAN23SV20MAMPX datasheet, pinout, applications, or equivalent options, key selection considerations include its programmable 200 kHz–1 MHz switching frequency, PFM mode for light-load efficiency, valley-current limiting via ILIM pin, thermal shutdown with 15°C hysteresis, and integrated boot diode - all critical for high-density, thermally constrained POL designs.
Technical Context
The FAN23SV20MAMPX implements Fairchild's constant on-time (COT) modulation with VIN feed-forward, enabling fixed-frequency operation in CCM and variable-frequency PFM in DCM for superior transient response without loop compensation. Its modulator uses a 320 ns minimum off-time to ensure stable current sensing and prevent multiple pulsing during transients.
Protection is implemented at silicon level: dual-level over-voltage detection (108–115% and 118–125% of VREF), under-voltage lockout on VCC (4.4 V threshold), valley-current limiting with ±10% accuracy at 24 A, and thermal shutdown at 155°C with automatic restart at 140°C - all coordinated through dedicated comparators and latch logic shown in the functional block diagram.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 7–18 V (with internal linear regulator bias); or 4.5–5.5 V when VIN/PVIN/PVCC tied together - enables dual-rail compatibility with 12 V and 5 V system supplies. |
| Output Current | 20 A continuous - supports high-power CPU/GPU core rails in servers and game consoles without external current sharing. |
| Reference Accuracy | ±1% over –40°C to +125°C - ensures tight output regulation across industrial temperature range without trimming. |
| Switching Frequency | Programmable 200 kHz to 1 MHz via resistor on FREQ pin - allows optimization of size (higher fSW → smaller inductor) vs. efficiency (lower fSW → lower switching loss). |
| Efficiency | >96% peak at 12 VIN/1.2 VOUT - achieved via synchronous rectification, low RDS(on) drivers, and integrated boot diode reducing external component count. |
| Soft-Start | Programmable via external capacitor on SS pin - provides monotonic VOUT ramp with tSS = 1 ms typical for 15 nF, preventing inrush current and bus droop. |
| Thermal Resistance | θJA = 22.7°C/W on 6-layer 7 cm × 7 cm PCB - enables 20 A operation without forced airflow in standard server board layouts. |
Pinout & Package
Package: 34-lead PQFN, 5.5 mm × 5.0 mm, exposed thermal pad - optimized for high-current power delivery and thermal dissipation in space-constrained applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVIN (Pads 5–11, 18–21, 23, 25, 30–34) | Power input for high-side/low-side MOSFETs | Dedicated high-current input pads minimize IR drop and improve thermal spreading; multiple parallel pads reduce impedance for 20 A conduction. |
| SW (Pads 2, 12–17, 22, 24, 27–29) | Switching node | Multi-pad SW connection reduces parasitic inductance and EMI, critical for fast-edge COT operation at up to 1 MHz. |
| BOOT (Pin 3) | High-side gate driver supply | Internal boot diode charges BOOT-SW capacitor; eliminates need for external diode while maintaining robust HS drive under heavy load. |
| ILIM (Pin 24) | Valley current limit set point | Resistor from ILIM to SW programs current limit threshold with ±10% accuracy - enables precise OCP tuning without sense resistors. |
| FREQ (Pin 32) | On-time and frequency programming | Resistor to AGND sets tON and fSW; open-circuit detection disables switching - prevents runaway if resistor is omitted or damaged. |
| PGOOD (Pin 30) | Open-drain power-good indicator | Asserts LOW on UV/OV/OC/OTP faults; 125 Ω pull-down enables direct interface to FPGA/CPU reset logic without external components. |
Key Features
| Feature | Design Value |
|---|---|
| Constant On-Time Control | Eliminates need for external compensation network and provides <10 µs load transient recovery - essential for dynamic CPU voltage scaling. |
| Pulse Frequency Modulation (PFM) | Reduces switching frequency below 200 kHz at light loads - improves efficiency by >15% at 100 mA versus forced PWM, extending battery life in NVDC notebooks. |
| Dual-Level Over-Voltage Protection | First level (108–115% VREF) shuts down both MOSFETs; second level (118–125% VREF) latches off until power cycle - protects sensitive SoCs from catastrophic overvoltage events. |
| Pre-Bias Startup | Allows safe startup into pre-charged output without discharging VOUT - required for hot-swap and rail sequencing in redundant power systems. |
| Integrated Linear Bias Regulator | Generates 4.75–5.25 V PVCC from VIN - enables single-rail operation and eliminates need for auxiliary 5 V supply in compact server VRMs. |
Applications
| Server Core Voltage Regulation | Telecom Base Station POL |
|---|---|
Use Scenario: Delivering 1.2 V @ 20 A to high-performance Xeon or EPYC processors in 1U rack servers with no forced airflow. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing power stage MOSFETs, providing feedback regulation, and coordinating protection responses. Use Value: 96% peak efficiency and 22.7°C/W θJA enable full-load operation within thermal envelope; PFM mode extends idle efficiency for energy-efficient data centers. | Use Scenario: Point-of-load conversion in 48 V telecom rectifier modules supplying 3.3 V/12 V to FPGAs and RF front-end ICs. IC Role / Device Role / Timing Role: High-current POL regulator with fast line/load transient response to handle bursty traffic patterns in LTE/5G baseband processing. Use Value: Constant on-time architecture achieves <500 ns recovery from 0→10 A load step; dual OV protection safeguards expensive RF components from supply faults. |
| Game Console GPU Power | Storage Controller Rail |
Use Scenario: Supplying dynamically scaled 0.8–1.1 V core voltage to discrete GPUs in next-gen gaming consoles with aggressive thermal constraints. IC Role / Device Role / Timing Role: Adaptive voltage regulator implementing VID-like tracking via FB divider and soft-start ramp coordination. Use Value: Programmable soft-start (1 ms typical) and pre-bias startup prevent output glitches during GPU clock gating; thermal shutdown with 15°C hysteresis avoids thermal cycling damage. | Use Scenario: Providing clean, regulated 1.8 V/3.3 V power to NVMe SSD controllers and NAND flash in enterprise storage arrays. IC Role / Device Role / Timing Role: High-reliability buck regulator with precise ±1% reference and robust fault handling for mission-critical storage subsystems. Use Value: ±1% VREF accuracy maintains timing margins across temperature; PGOOD signal enables host firmware to detect undervoltage before data corruption occurs. |
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 | 17 A rated, 4.5–28 V input, fixed 500 kHz fSW, no PFM mode, requires external bootstrap diode | Lacks light-load efficiency optimization; less suitable for battery-backed or always-on telecom modules | Select when fixed frequency and simpler layout outweigh efficiency needs at partial load. |
| TPS543C20RTVR | 30 A rated, 3–18 V input, D-CAP3 control, integrated MOSFETs, 2.5 mΩ/1.2 mΩ RDS(on) | Higher current capability but larger 4.5 mm × 3.5 mm QFN package; no internal linear regulator - requires separate 5 V bias | Select when higher current headroom and integrated FETs justify added cost and board area. |
Compared with MP2315DJ-LF-Z and TPS543C20RTVR, the FAN23SV20MAMPX uniquely balances 20 A capability, integrated bias regulation, PFM efficiency, and compact 5.5 mm × 5.0 mm footprint - making it optimal for thermally dense, multi-rail server and telecom POL designs where layout area and light-load performance are critical.
Availability
FAN23SV20MAMPX is available at Aetrix Electronics and suitable for server motherboard development, telecom base station power modules, and high-end gaming console power delivery requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for FAN23SV20MAMPX 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 manufacturer specializing in power management, analog, sensor, and logic solutions for automotive, industrial, cloud, and IoT applications.
The FAN23SV20MAMPX belongs to ON Semiconductor's high-current synchronous buck regulator product line, engineered specifically for high-efficiency, high-density point-of-load conversion in data center, networking, and consumer electronics infrastructure.
FAQ
What input voltage ranges does the FAN23SV20MAMPX support?
The FAN23SV20MAMPX supports two distinct input configurations: 7–18 V when using the internal linear regulator for bias (VIN connected to modulator, PVIN to power stage), or 4.5–5.5 V when VIN, PVIN, and PVCC are tied together to bypass the internal regulator. This dual-range capability allows seamless integration into both 12 V server rails and 5 V telecom intermediate buses without redesigning the power stage.
How is over-current protection implemented in the FAN23SV20MAMPX?
The FAN23SV20MAMPX implements valley-current limiting via the ILIM pin: a resistor between ILIM and SW sets the current threshold with ±10% accuracy at 24 A. During an over-current event, the high-side MOSFET is disabled and the low-side remains on until inductor current falls below the set point. The FAN23SV20MAMPX also includes open-detection circuitry on ILIM to prevent operation without current limiting - a critical safety feature absent in many competing controllers.
Does the FAN23SV20MAMPX require external compensation components?
No, the FAN23SV20MAMPX uses constant on-time (COT) control architecture, which eliminates the need for external compensation networks such as type-II or type-III error amplifier compensation. Stability is inherently maintained through the VIN feed-forward path and fixed on-time modulation - simplifying design, reducing BOM count, and improving transient response predictability compared to voltage-mode or current-mode controllers requiring loop tuning.
What is the purpose of the PGOOD pin on the FAN23SV20MAMPX?
The PGOOD pin on the FAN23SV20MAMPX is an open-drain output that asserts LOW when the output voltage falls outside the regulation window (±11% of VREF), or during over-voltage, over-current, or thermal shutdown events. With a 125 Ω internal pull-down, it interfaces directly to FPGA, ASIC, or microcontroller reset inputs without external components - enabling reliable power sequencing and fault reporting in complex multi-rail systems using the FAN23SV20MAMPX.
Can the FAN23SV20MAMPX start up into a pre-biased output?
Yes, the FAN23SV20MAMPX supports pre-bias startup: it prevents discharging of an existing output voltage during soft-start by disabling the low-side MOSFET until the first positive PWM edge, and forces PFM mode to maintain positive inductor current. This capability is essential for hot-swap applications, redundant power systems, and systems requiring strict rail sequencing - ensuring the FAN23SV20MAMPX integrates safely into existing power architectures without additional isolation circuitry.
FAN23SV20MAMPX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- 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):
- 18V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 20A
- Frequency - Switching:
- 200kHz ~ 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 34-PQFN (5.5x5)
FAN23SV20MAMPX FAQ
1.How can I place an order for FAN23SV20MAMPX through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN23SV20MAMPX 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 FAN23SV20MAMPX reliable?
The price and inventory of FAN23SV20MAMPX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN23SV20MAMPX is usually 5 days.
3.What payment methods are accepted for FAN23SV20MAMPX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN23SV20MAMPX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN23SV20MAMPX?
FAN23SV20MAMPX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN23SV20MAMPX 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 FAN23SV20MAMPX?
For technical support, including FAN23SV20MAMPX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN23SV20MAMPX requirements.
6.How does Aetrix verify that FAN23SV20MAMPX is sourced from the original manufacturer or authorized distributors?
All FAN23SV20MAMPX 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 FAN23SV20MAMPX meets industry standards.
7.What is the process for return or replacement of FAN23SV20MAMPX?
All FAN23SV20MAMPX units undergo pre-shipment inspection (PSI). If there is an issue with FAN23SV20MAMPX, 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 FAN23SV20MAMPX part is unused and in its original packaging.
Return procedure for FAN23SV20MAMPX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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