My Inquiry
My Account
onsemi FAN21SV06MPX
 TinyBuck.jpg)
- Part No.:
- FAN21SV06MPX
- Manufacturer:
- onsemi
- Package:
- 25-WQFN Exposed Pad
- Datasheet:
-
FAN21SV06MPX.pdf
- Description:
- IC REG BUCK ADJ 6A 25MLP
- Quantity:
- Payment:
- Shipping:
Inventory:4,967
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
FAN21SV06MPX from onsemi is a fully integrated synchronous buck regulator delivering up to 6 A output current with input voltage range of 3.0 V–24 V, programmable switching frequency (200–600 kHz), and internal 5 V bias regulator - designed for point-of-load regulation in graphics cards and telecom infrastructure.
For engineers reviewing the FAN21SV06MPX datasheet, pinout, applications, or equivalent options, key selection criteria include its 5 × 6 mm MLP-25 package with thermal pads, external compensation flexibility, pre-bias startup capability, and master/slave synchronization support for multi-phase systems.
Technical Context
The FAN21SV06MPX integrates high-side and low-side MOSFETs, PWM controller, gate drivers, and a 5 V internal regulator in a single MLP package. Its summing-mode current-mode control uses sensed inductor current and an internally generated ramp signal compared against the error amplifier output.
It supports dual-supply operation (VIN and VIN_Reg) or single-supply operation above 6.5 V, features cycle-by-cycle over-current protection via ILIM pin programming, and implements soft-start with fault-latch reset via EN pin toggling - all while maintaining <±1% output voltage accuracy at FB pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 6 A continuous - enables compact point-of-load conversion without external MOSFETs or discrete drivers. |
| Input Voltage Range | 3.0 V to 24 V - supports wide-range DC inputs including 3.3 V, 5 V, 12 V, and 24 V rails. |
| Switching Frequency | 200–600 kHz programmable via RT resistor - allows optimization between efficiency and component size. |
| Reference Voltage | 0.800 V ±0.6% at 25°C - sets output voltage accuracy and stability across temperature and load. |
| Efficiency | Over 94% at 12 VIN/1.8 VOUT/3 A - achieved via integrated low-RDS(ON) MOSFETs and synchronous rectification. |
| Thermal Resistance | θJ-PCB = 35°C/W - enables high-power density operation on standard 4-layer PCBs with proper copper area. |
| Protection Features | Over-current, over-voltage (115% VOUT), under-voltage (73% VOUT), thermal shutdown (155°C) - ensures robust system-level fault tolerance. |
Pinout & Package
Package: 5 × 6 mm, 25-pin Molded Leadless Package (MLP) with three exposed thermal pads (P1, P2, P3) for enhanced heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (P1, P6–P12) | Switching Node | Junction of internal high-side and low-side MOSFETs; connects to inductor and bootstrap capacitor. |
| VIN (P2, P3–P5) | Main Power Input | Supplies power to high-side MOSFET and internal logic; accepts 3.0–24 V input. |
| PGND (P3, P21–P23) | Power Ground | Low-side MOSFET source return path; must be connected to low-impedance ground plane. |
| BOOT (Pin 1) | High-Side Gate Drive Supply | Connects to SW via CBOOT; internal bootstrap diode recharges it to ~5 V for high-side drive. |
| VIN_Reg (Pin 2) | Bias Regulator Input | Input to internal 5 V regulator; requires ≥6.5 V and 1 µF ceramic bypass for stable operation. |
| PGOOD (Pin 13) | Power-Good Signal | Open-drain output asserting LOW when FB voltage deviates >±11% from 0.8 V reference. |
| EN (Pin 14) | Enable Control | Logic HIGH enables operation; internal pull-up allows default-on; toggling resets latched faults. |
| 5V_Reg (Pin 15) | Internal Regulator Output | Stable 5 V supply for IC logic/analog circuits; capable of sourcing up to 5 mA. |
| AGND (Pin 16) | Analog Ground Reference | Signal ground for feedback, compensation, and error amplifier; must tie directly to ground island. |
| ILIM (Pin 17) | Current Limit Programming | Resistor to AGND sets lower current-limit threshold than internal default (7–11 A). |
| RT (Pin 18) | Oscillator & Sync Mode Control | Resistor to AGND configures master mode/frequency; resistor to 5V_Reg configures slave sync input. |
| FB (Pin 19) | Feedback Input | Monitors output voltage via resistor divider; 650 nA sink current enables open-circuit detection. |
| COMP (Pin 20) | Compensation Node | Error amplifier output; external RC network between COMP and FB sets loop stability. |
| CLK (Pin 24) | Bi-directional Clock I/O | Master mode: outputs synchronized clock with 180° phase shift; slave mode: accepts external clock. |
| RAMP (Pin 25) | Ramp Amplitude Control | Resistor to VIN sets internal ramp slope and provides voltage feedforward for line regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Synchronous Buck | Combines controller, drivers, and both MOSFETs in one 5 × 6 mm MLP package - eliminates external power stage components. |
| Programmable Switching Frequency | 200–600 kHz via single RT resistor - balances efficiency, EMI, and inductor/capacitor size trade-offs. |
| Master/Slave Synchronization | CLK pin operates bi-directionally - enables precise phase alignment across multiple FAN21SV06MPX regulators in multi-phase designs. |
| Pre-Bias Startup Support | Prevents output discharge during startup - critical for hot-swap and cascaded power rail applications. |
| External Compensation | COMP pin allows full control over loop dynamics - supports custom transient response tuning and ceramic output capacitor use. |
| Robust Fault Protection | Independent over-voltage, under-voltage, over-current, and thermal shutdown with latch/auto-restart options via EN configuration. |
Applications
| Graphics Card VRM | Telecom Point-of-Load |
|---|---|
|
Use Scenario: Providing tightly regulated 1.2 V or 1.8 V core voltage to GPU ASICs under dynamic load transients up to 6 A. IC Role / Device Role / Timing Role: Primary synchronous buck converter delivering high-current, low-noise power with fast transient response. Use Value: Achieves >94% efficiency at 12 VIN/1.8 VOUT, reducing thermal load on densely packed PCBs while supporting PCIe-compliant power sequencing. |
Use Scenario: Generating intermediate 3.3 V or 5 V rails from 12 V or 48 V backplane supplies in base station power modules. IC Role / Device Role / Timing Role: Standalone POL regulator with synchronization capability for coherent multi-rail timing in distributed power architectures. Use Value: Enables phase-aligned switching across multiple rails using CLK master/slave mode - minimizing input ripple and improving EMI performance. |
| Server CPU Core Supply | Set-Top Box SoC Power |
|
Use Scenario: Delivering scalable 0.8–1.2 V output to server microprocessors with adaptive voltage scaling requirements. IC Role / Device Role / Timing Role: Programmable-frequency buck regulator supporting dynamic frequency/voltage scaling via external RT and FB divider. Use Value: External compensation and adjustable current limit allow fine-tuning for varying processor load profiles and thermal constraints. |
Use Scenario: Powering multimedia SoCs in consumer set-top boxes requiring reliable 1.2 V and 3.3 V rails from 12 V adapter input. IC Role / Device Role / Timing Role: Compact, self-contained buck regulator with built-in protections and power-good signaling for system monitoring. Use Value: Integrated 5 V regulator and pre-bias startup eliminate need for auxiliary bias supplies - simplifying BOM and layout. |
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 | 3 A max output, 4.5–36 V input, no internal 5 V regulator, fixed 500 kHz frequency. | Lacks master/slave sync, pre-bias startup, and external compensation - limited to simpler, lower-current designs. | Select when cost-sensitive, lower-current (<3 A), and no synchronization or advanced loop control is required. |
| TPS54620RGYR | 6 A output, 4.5–17 V input, integrated FETs, 200–900 kHz programmable, but no internal 5 V bias regulator. | Requires external 5 V bias supply; lacks VIN_Reg UVLO and single-supply operation above 6.5 V. | Choose when higher input voltage range (>17 V) is unnecessary and external bias supply is already available. |
Compared with MP2451DT-LF-Z and TPS54620RGYR, the FAN21SV06MPX uniquely combines 6 A capability, single-supply operation >6.5 V, integrated 5 V regulator, and bi-directional CLK synchronization - making it optimal for space-constrained, multi-phase, high-efficiency POL systems where bias simplicity and timing coherence are critical.
Availability
FAN21SV06MPX is available at Aetrix Electronics and suitable for graphics card VRMs, telecom point-of-load regulation, and server CPU core supplies requiring stable component supply, long-term lifecycle support, and consistent parametric performance.
Supply support for FAN21SV06MPX 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 (formerly Fairchild Semiconductor) is a global semiconductor supplier focused on energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and IoT applications.
The FAN21SV06MPX belongs to the TinyBuck™ family of integrated synchronous buck regulators - engineered specifically for high-current, small-footprint point-of-load conversion in computing and communications infrastructure.
FAQ
What is the maximum output current supported by the FAN21SV06MPX?
The FAN21SV06MPX delivers up to 6 A continuous output current under recommended operating conditions (TA ≤ 85°C, proper PCB thermal design). Peak current capability depends on thermal management - with θJ-PCB = 35°C/W on a 4-layer board, sustained 6 A operation is achievable at ambient temperatures up to 65°C with adequate copper area.
Does the FAN21SV06MPX support startup into a pre-biased output?
Yes, the FAN21SV06MPX supports startup into a pre-biased output. It prevents low-side MOSFET conduction until the soft-start ramp reaches ~95% of the reference voltage (~0.76 V), avoiding output discharge and enabling safe hot-swap and cascaded power rail applications without external circuitry.
How is the switching frequency programmed on the FAN21SV06MPX?
The switching frequency of the FAN21SV06MPX is programmed using an external resistor (RT) connected from Pin 18 (RT) to AGND for master mode, or to 5V_Reg for slave mode. In master mode, fSW ≈ 10⁶/(RT + 65) kHz, where RT is in kΩ - enabling precise 200–600 kHz adjustment with standard resistor values.
What protection features does the FAN21SV06MPX include?
The FAN21SV06MPX includes over-current protection (programmable via ILIM pin), over-voltage protection (115% VOUT), under-voltage protection (73% VOUT), thermal shutdown (155°C), and input UVLO (6.3 V rising). All protections feature latched or auto-restart behavior configurable via the EN pin connection.
Can the FAN21SV06MPX operate from a 3.3 V input supply?
Yes, the FAN21SV06MPX supports 3.0 V–24 V input, but requires dual-supply operation below 6.5 V: VIN (3.3 V) powers the power stage, while a separate ≥6.5 V source must be applied to VIN_Reg (Pin 2) to enable the internal 5 V regulator and logic circuits - ensuring full functionality including gate drive and feedback control.
FAN21SV06MPX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- TinyBuck®
- Package/Case:
- 25-WQFN Exposed Pad
- 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):
- 3V
- Voltage - Input (Max):
- 24V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 19.2V
- Current - Output:
- 6A
- Frequency - Switching:
- 200kHz ~ 600kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -10°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 25-MLP (6x5)
FAN21SV06MPX FAQ
1.How can I place an order for FAN21SV06MPX through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN21SV06MPX 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 FAN21SV06MPX reliable?
The price and inventory of FAN21SV06MPX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN21SV06MPX is usually 5 days.
3.What payment methods are accepted for FAN21SV06MPX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN21SV06MPX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN21SV06MPX?
FAN21SV06MPX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN21SV06MPX 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 FAN21SV06MPX?
For technical support, including FAN21SV06MPX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN21SV06MPX requirements.
6.How does Aetrix verify that FAN21SV06MPX is sourced from the original manufacturer or authorized distributors?
All FAN21SV06MPX 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 FAN21SV06MPX meets industry standards.
7.What is the process for return or replacement of FAN21SV06MPX?
All FAN21SV06MPX units undergo pre-shipment inspection (PSI). If there is an issue with FAN21SV06MPX, 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 FAN21SV06MPX part is unused and in its original packaging.
Return procedure for FAN21SV06MPX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
FAN21SV06MPX Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
