My Inquiry
My Account
onsemi FAN2103MPX
- Part No.:
- FAN2103MPX
- Manufacturer:
- onsemi
- Package:
- 25-WQFN Exposed Pad
- Datasheet:
-
FAN2103MPX.pdf
- Description:
- IC REG BUCK ADJ 3A 25MLP
- Quantity:
- Payment:
- Shipping:
Inventory:4,790
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
FAN2103MPX from ON Semiconductor is a fully integrated synchronous buck regulator delivering 3 A output current with input voltage range of 3 V to 24 V, programmable switching frequency from 200 kHz to 600 kHz, and output voltage adjustable from 0.8 V to 90% VIN - used in point-of-load regulation for graphics cards and servers.
For engineers reviewing the FAN2103MPX datasheet, pinout, applications, or equivalent options, key selection criteria include its 5×6 mm 25-pin MLP package with three exposed thermal pads, integrated power-good signaling, lossless current sensing, and external compensation for loop stability optimization in high-density DC/DC designs.
Technical Context
The FAN2103MPX employs a summing current-mode modulator with voltage feedforward, enabling stable operation across wide input ranges and fast transient response. Its architecture integrates low-RDS(ON) MOSFETs and uses lossless current sensing for both regulation and over-current protection.
It features programmable frequency via RT resistor (200–600 kHz), adjustable current limit via ILIM resistor, and ramp amplitude tuning via RRAMP for VIN feedforward compensation - all supporting flexible design adaptation without changing core topology.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3 A continuous - supports high-current point-of-load rails without external MOSFETs. |
| Input Voltage Range | 3 V to 24 V - enables single-regulator compatibility across 5 V, 12 V, and 24 V system rails. |
| Switching Frequency | 200 kHz to 600 kHz - selectable via RT resistor; higher frequencies reduce inductor size but increase switching loss. |
| Reference Voltage | 800 mV ±6 mV at 25°C - sets output accuracy; temperature coefficient ≤70 ppm/°C ensures stability over -10°C to +85°C. |
| Efficiency | >95% peak - achieved via fully synchronous operation and integrated Schottky diode on low-side MOSFET. |
| Protection Features | UVLO, OVP (115% VOUT), UVP (73% VOUT), OTP (160°C), and latched fault shutdown - prevents damage during abnormal operating conditions. |
| Package | 5×6 mm, 25-pin MLP with 3 exposed thermal pads - provides low θJC (4–7°C/W) for high-power density thermal management. |
Pinout & Package
The FAN2103MPX is housed in a 5×6 mm, 25-pin Molded Leadless Package (MLP) with three exposed thermal pads (P1, P2, P3) for enhanced heat dissipation. Pin numbering follows bottom-view orientation per Figure 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (P1, 6–12) | Switching Node | Connects to inductor and boot capacitor; carries high dv/dt and pulsed current - requires tight layout to minimize EMI. |
| VIN (P2, 2–5) | Power Input | Main input supply connection; multiple pins reduce IR drop and improve current sharing in high-current paths. |
| PGND (P3, 21–23) | Power Ground | Low-impedance return path for high-side and low-side MOSFETs; must be tied directly to thermal pad for optimal thermal performance. |
| BOOT (1) | High-Side Gate Drive Supply | Bootstrapped supply for high-side MOSFET gate drive; requires external ceramic capacitor between BOOT and SW. |
| PGOOD (13) | Power-Good Flag | Open-drain output asserting LOW when FB deviates >±10% from reference - used for system sequencing and fault monitoring. |
| EN (14) | Enable Input | Logic-level enable with internal pull-up; toggling resets latched faults - supports remote on/off control and power sequencing. |
| VCC (15) | Bias Supply | 5 V ±0.5 V bias rail powering internal logic and gate drivers; requires ≥1 µF X5R/X7R decoupling to PGND. |
| AGND (16) | Analog Ground | Reference ground for feedback and error amplifier; must be isolated from PGND except at single-point star connection. |
| ILIM (17) | Current Limit Programming | Resistor-to-AGND sets trip threshold below default 5 A - enables precise over-current protection tuning. |
| R(T) (18) | Oscillator Frequency Set | Resistor-to-AGND selects switching frequency; 24 kΩ yields ~600 kHz, 50 kΩ yields ~300 kHz. |
| FB (19) | Feedback Input | Monitors output voltage via resistor divider; 800 mV reference enables accurate output setting from 0.8 V upward. |
| COMP (20) | Compensation Node | Error amplifier output; connects external Type-2 or Type-3 network to stabilize control loop across load and line variations. |
| RAMP (25) | Ramp Amplitude Control | Resistor-to-VIN sets ramp slope for voltage feedforward - improves line transient response and loop robustness. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Synchronous Power Stage | Eliminates need for external high-side and low-side MOSFETs - reduces BOM count and PCB area in space-constrained applications. |
| External Compensation | Enables full control over loop bandwidth and phase margin using standard Type-2 or Type-3 networks - critical for stability with ceramic output capacitors. |
| Programmable Over-Current Limit | Adjustable trip point via ILIM resistor allows precise matching to system-level current requirements - avoids unnecessary derating or false trips. |
| Power-Good Signal with Fault Latching | PGOOD remains LOW after fault until EN toggle or VCC cycle - ensures reliable system-level fault detection and controlled restart behavior. |
| Thermally Optimized MLP Package | Three exposed thermal pads and low θJC (as low as 4°C/W) support 3 A continuous operation without heatsink in typical 4-layer PCB layouts. |
Applications
| Graphics Cards | Battery-Powered Equipment |
|---|---|
Use Scenario: Providing core GPU voltage rail (e.g., 1.05 V @ 2.5 A) in discrete graphics modules with strict thermal and space constraints. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering tightly regulated, high-current DC power with fast transient response to GPU load steps. Use Value: Achieves >94% efficiency at 12 V input and 1.05 V output, minimizing heat generation and extending thermal headroom in compact dual-slot form factors. | Use Scenario: Generating processor I/O or memory voltage (e.g., 1.8 V @ 1.5 A) in portable industrial handhelds powered by 3-cell Li-ion (9–12.6 V). IC Role / Device Role / Timing Role: Point-of-load regulator converting variable battery voltage to stable low-voltage rail with UVLO and soft-start for cold-start reliability. Use Value: Wide 3–24 V input range accommodates full battery discharge curve; programmable frequency allows optimization for lowest quiescent current at light loads. |
| Set-Top Boxes | Servers |
Use Scenario: Supplying 3.3 V or 5 V auxiliary rails for SoC peripherals and HDMI PHY in consumer STB platforms with cost-sensitive BOM targets. IC Role / Device Role / Timing Role: Secondary buck converter replacing discrete controller + MOSFET solutions to reduce component count and assembly cost. Use Value: Integrated power stage and ceramic-capacitor compatibility eliminate electrolytic bulk caps and simplify layout - lowering total solution cost by ~18% vs. discrete alternatives. | Use Scenario: Delivering 1.2 V core voltage to FPGA or ASIC in telecom server line cards requiring high reliability and thermal resilience. IC Role / Device Role / Timing Role: High-current POL regulator with OTP, OVP, and UVP protections ensuring uninterrupted operation under sustained 100% load and ambient up to 85°C. Use Value: Latched fault protection and PGOOD signaling enable BMC-level fault logging and graceful system degradation - meeting NEBS Level 3 thermal and reliability requirements. |
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 | 2 A output, 6 V max input, fixed 500 kHz frequency, no RAMP or ILIM programming pins. | Limited to lower-current, lower-input-voltage applications; lacks feedforward and adjustable current limit. | Select when 2 A and ≤6 V input suffice and design simplicity outweighs flexibility. |
| TPS54332DR | 3 A output, 3.5–28 V input, adjustable frequency (100–2500 kHz), but requires external high-side MOSFET. | Higher board area and BOM count; better for ultra-low-noise or ultra-high-frequency designs where external FET control is needed. | Choose when greater frequency range or external MOSFET selection is required despite added complexity. |
Compared with MP2315DJ-LF-Z, FAN2103MPX delivers 50% higher current and 4× wider input range with programmable protections; versus TPS54332DR, it eliminates external FETs and gate drivers while offering integrated ramp feedforward - reducing design risk and layout sensitivity in high-density systems.
Availability
FAN2103MPX is available at Aetrix Electronics and suitable for graphics cards, battery-powered equipment, and set-top boxes requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for FAN2103MPX 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, and consumer markets.
The FAN2103MPX belongs to the TinyBuck™ family of integrated synchronous buck regulators designed specifically for space-constrained, high-efficiency point-of-load applications where minimal external components and thermal resilience are critical.
FAQ
What is the maximum input voltage rating for the FAN2103MPX?
The FAN2103MPX has an absolute maximum VIN-to-PGND rating of 28 V, with recommended operating range from 3 V to 24 V. Exceeding 24 V continuously risks violating safe operating area limits and may trigger over-voltage protection or cause permanent damage. The device's internal MOSFETs and gate drivers are optimized for this 24 V ceiling, making FAN2103MPX suitable for 12 V and 24 V industrial and computing rails but not for 48 V systems.
Does the FAN2103MPX require an external bootstrap diode?
No, the FAN2103MPX does not require an external bootstrap diode. It integrates a synchronous bootstrap diode that recharges the boot capacitor (CBOOT) from VCC when the SW node is low. This internal diode eliminates one external component and simplifies layout - a key advantage of the FAN2103MPX over controllers requiring discrete high-side gate drive solutions.
How is the output voltage set on the FAN2103MPX?
The output voltage of the FAN2103MPX is set using a resistor divider from VOUT to AGND, with the FB pin connected to the midpoint. The internal 800 mV reference determines VOUT = 0.8 V × (1 + R1/R2). The FB pin draws only −650 nA bias current, enabling use of high-value resistors to minimize divider power loss - a design feature confirmed in the FAN2103MPX Electrical Specifications table and Application Circuit (Figure 10).
What thermal performance can be expected from the FAN2103MPX in a standard PCB layout?
In a four-layer, two-ounce copper PCB per Fairchild AN-5067, the FAN2103MPX achieves a junction-to-PCB thermal resistance (θJ-PCB) of 35°C/W and delivers 3 A continuously at ambient temperatures up to +85°C. Measured power dissipation is ≤0.7 W at 12 V input and 1.8 V/3 A output, allowing reliable operation without forced air or heatsinks in typical applications - data validated in the Thermal Information and Typical Performance Characteristics sections of the FAN2103MPX datasheet.
Can the FAN2103MPX start up into a pre-biased output?
Yes, the FAN2103MPX supports startup into a pre-biased output, as demonstrated in Figure 16 of the datasheet. Its soft-start circuit inhibits full synchronous rectification until the internal ramp reaches ~0.76 V, preventing inductor current "ratcheting" and negative undershoot. This capability is intrinsic to the FAN2103MPX control architecture and requires no external components - making it suitable for hot-swap and multi-rail sequencing applications.
FAN2103MPX 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):
- 21.6V
- Current - Output:
- 3A
- Frequency - Switching:
- 300kHz ~ 600kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -10°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 25-MLP (6x5)
FAN2103MPX FAQ
1.How can I place an order for FAN2103MPX through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN2103MPX 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 FAN2103MPX reliable?
The price and inventory of FAN2103MPX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN2103MPX is usually 5 days.
3.What payment methods are accepted for FAN2103MPX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN2103MPX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN2103MPX?
FAN2103MPX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN2103MPX 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 FAN2103MPX?
For technical support, including FAN2103MPX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN2103MPX requirements.
6.How does Aetrix verify that FAN2103MPX is sourced from the original manufacturer or authorized distributors?
All FAN2103MPX 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 FAN2103MPX meets industry standards.
7.What is the process for return or replacement of FAN2103MPX?
All FAN2103MPX units undergo pre-shipment inspection (PSI). If there is an issue with FAN2103MPX, 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 FAN2103MPX part is unused and in its original packaging.
Return procedure for FAN2103MPX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
FAN2103MPX 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…
