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onsemi FAN2012MPX
- Part No.:
- FAN2012MPX
- Manufacturer:
- onsemi
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
FAN2012MPX.pdf
- Description:
- IC REG BUCK ADJ 1.5A 6MLP
- Quantity:
- Payment:
- Shipping:
Inventory:1,411
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Product details
Overview
FAN2012MPX from onsemi (formerly Fairchild) is a 1.5 A synchronous PWM buck regulator optimized for low-voltage point-of-load conversion in space-constrained applications. It operates from 4.5 V to 5.5 V input, delivers adjustable output from 0.8 V to 3.5 V, and uses current-mode control with fixed 1.3 MHz switching frequency. It is used in notebook computers and set-top boxes where compact, high-efficiency DC-DC conversion is required.
For engineers reviewing the FAN2012MPX datasheet, pinout, applications, or equivalent options, this page provides verified technical context, validated pin functions, confirmed operating parameters, and real-world design implications - including thermal shutdown at 150°C, UVLO threshold of 3.4–4.0 V, and soft-start limiting inrush current during startup.
Technical Context
The FAN2012MPX implements a current-mode PWM architecture with internal P-channel and N-channel MOSFETs, enabling synchronous rectification and up to 95% efficiency. Its 1.3 MHz fixed-frequency operation allows use of small 3.3 µH inductors and ceramic capacitors.
It features cycle-by-cycle peak current limiting (2.2–3.5 A), thermal shutdown with 20°C hysteresis, and an enable input that reduces supply current to ≤1.0 µA in shutdown mode. The feedback reference is precisely trimmed to 0.8 V, supporting accurate output regulation across load and temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 5.5 V - supports stable operation from standard 5 V rail with ±10% tolerance. |
| Output Voltage Range | 0.8 V to 3.5 V - adjustable via external resistor divider; enables precise core voltage scaling for processors and ASICs. |
| Max Output Current | 1.5 A continuous - sufficient for powering DDR memory, FPGA I/O banks, or SoC peripherals. |
| Switching Frequency | 1.3 MHz (typical) - permits compact 3.3 µH inductor and low-ESR ceramic capacitor selection. |
| Reference Voltage | 0.8 V ±2% - ensures tight output accuracy without trimming; sets minimum output voltage floor. |
| UVLO Threshold | 3.4 V to 4.0 V with 150 mV hysteresis - prevents erratic startup during brown-out conditions. |
| Shutdown Current | ≤1.0 µA - enables ultra-low-power system standby modes when EN is pulled low. |
Pinout & Package
Package: 3×3 mm, 6-lead molded leadless package (MLP) with exposed thermal pad (DAP). Designed for high thermal conductivity and minimal PCB footprint in dense layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P1 (AGND) | Analog Ground | Reference ground for feedback and internal circuitry; must be connected directly to PCB ground plane. |
| 1 (FB) | Feedback Input | Connects to resistor divider; regulates output by comparing divided voltage to 0.8 V internal reference. |
| 2 (PGND) | Power Ground | Return path for internal MOSFET switches; requires low-inductance connection to AGND near DAP. |
| 3 (SW) | Switching Node | Drives external inductor; carries high di/dt; must be routed short and away from noise-sensitive traces. |
| 4 (PVIN) | Power Input (High-Side Switch) | Supplies internal P-MOSFET; connects to input capacitor and shares path with VIN for low-impedance routing. |
| 5 (VIN) | Supply Input (Logic & Bias) | Provides bias for control circuitry; decoupled separately from PVIN to reduce noise coupling. |
| 6 (EN) | Enable Input | Active-high logic control; <0.4 V disables device, >1.3 V enables; must not be left floating. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous PWM Operation | Eliminates external Schottky diode, reducing conduction loss and improving efficiency to 95% at full load. |
| Current-Mode Control | Enables fast load transient response (<5% output deviation during 100 mA ↔ 700 mA step) and inherent cycle-by-cycle current limiting. |
| Soft-Start Function | Digital four-step ramp limits inrush current; typical startup time is 800 µs with 40 µF output capacitance and 1.5 A load. |
| Thermal Shutdown Protection | Activates at 150°C junction temperature and releases at 130°C, preventing permanent damage during sustained overload or poor heatsinking. |
| UVLO with Hysteresis | Ensures clean power-on sequencing by holding reset until VIN exceeds 4.0 V and remains above 3.85 V during operation. |
Applications
| Hard Disk Drive Power Supply | Set-Top Box Core Rail |
|---|---|
Use Scenario: Supplies regulated 1.2 V or 1.5 V to HDD controller ICs and motor drivers from 5 V bus. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering stable, low-noise core voltage under dynamic load transitions. Use Value: Maintains <±0.5% load regulation across 0–1.5 A, minimizing timing jitter in SATA interface clocks and reducing error rates. |
Use Scenario: Powers video decoder SoC and HDMI PHY in consumer STB platforms requiring compact, efficient 1.0–1.8 V rails. IC Role / Device Role / Timing Role: Point-of-load converter placed near processor die; manages rapid load steps during video decode bursts. Use Value: Delivers <5% output deviation during 700 mA ↔ 100 mA transients, preserving signal integrity in high-speed serial links. |
| Notebook Computer I/O Rail | Communications Equipment LDO Pre-Regulator |
Use Scenario: Generates 3.3 V or 2.5 V for USB controllers, card readers, and display interfaces in ultraportable notebooks. IC Role / Device Role / Timing Role: High-frequency buck stage preceding low-dropout regulators to improve overall system efficiency. Use Value: 1.3 MHz switching avoids AM radio band interference and enables use of tiny 3.3 µH shielded inductors in thin-profile designs. |
Use Scenario: Provides clean, regulated 3.3 V input to low-noise LDOs powering RF front-end ICs in base station modules. IC Role / Device Role / Timing Role: First-stage DC-DC converter reducing 5 V input to intermediate rail before final LDO filtering. Use Value: 95% peak efficiency minimizes heat generation in thermally constrained RF modules, extending component lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2108DJ-LF-Z | Fixed 3.3 V output; 1.5 A rating; 2 MHz switching; different pinout and no EN pin. | Not adjustable - unsuitable where variable output or feedback loop tuning is required. | Select only if fixed 3.3 V output suffices and board layout accommodates different footprint and control interface. |
| TPS561201DDFR | 1.5 A, 4.5–17 V input, adjustable 0.6–7 V output; 600 kHz switching; integrated compensation. | Broad input range supports 12 V intermediate rails; lower frequency increases inductor size but improves EMI profile. | Prefer for new designs needing wider VIN range or higher output flexibility; not pin-compatible with FAN2012MPX. |
Compared with MP2108DJ-LF-Z and TPS561201DDFR, the FAN2012MPX offers tighter 0.8 V reference accuracy (±2%), smaller 3×3 mm MLP package, and faster transient response due to current-mode control - making it suitable for legacy space-constrained 5 V-input systems despite discontinuation status.
Availability
FAN2012MPX is available at Aetrix Electronics and suitable for hard disk drive, set-top box, and notebook computer applications requiring stable component supply despite its discontinued status.
Supply support for FAN2012MPX 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 specializing in energy-efficient power management, analog, sensing, and connectivity solutions.
The FAN2012MPX belongs to onsemi's legacy high-frequency synchronous buck regulator product line, designed specifically for compact, high-efficiency point-of-load conversion in consumer and computing applications.
FAQ
What is the operating temperature range for the FAN2012MPX?
The FAN2012MPX is rated for an operating ambient temperature range of 0°C to +85°C. This specification applies to the FAN2012MPX variant specifically; the FAN2012EMPX extends down to –40°C. Thermal shutdown activates at 150°C junction temperature, providing protection beyond ambient limits. For reliable long-term operation, ensure PCB thermal design maintains FAN2012MPX junction temperature below 125°C under maximum load.
Does the FAN2012MPX require an external Schottky diode?
No, the FAN2012MPX does not require an external Schottky diode because it integrates both high-side P-channel and low-side N-channel MOSFETs for synchronous rectification. This internal synchronous architecture eliminates conduction losses associated with external diodes and contributes to the device's 95% peak efficiency. The SW pin connects directly to the inductor without any diode in series.
What is the purpose of separate VIN and PVIN pins on the FAN2012MPX?
The FAN2012MPX separates VIN (logic/bias supply) and PVIN (power switch supply) to isolate noise-sensitive control circuitry from high-current switching paths. VIN powers the internal reference, error amplifier, and logic; PVIN supplies the internal P-MOSFET. This separation reduces coupling of switching noise into regulation circuitry, improving stability and output voltage accuracy - especially critical in low-noise applications like communications equipment.
Can the FAN2012MPX be used with input voltages below 4.5 V?
No, the FAN2012MPX is not specified for operation below 4.5 V input. Its absolute maximum rating allows down to –0.3 V, but the recommended operating range starts at 4.5 V. Below this, UVLO prevents startup (threshold is 3.4–4.0 V), and internal MOSFET RDS(on) increases significantly, degrading efficiency and thermal performance. Using FAN2012MPX with <4.5 V risks failure to regulate or excessive junction heating.
How is output voltage set on the FAN2012MPX?
Output voltage on the FAN2012MPX is set using an external resistor divider connected between VOUT, FB, and AGND. With a precise 0.8 V internal reference, the formula is VOUT = 0.8 V × (1 + R1/R2). For example, R2 = 10 kΩ and R1 = 8.87 kΩ yields 1.5096 V. The FB pin draws only 0.1 µA bias current, minimizing divider error. Layout best practice places the divider away from the inductor to avoid RF coupling.
FAN2012MPX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 6-WDFN 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):
- 4.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 1.3MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- 0°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-MLP (3x3)
FAN2012MPX FAQ
1.How can I place an order for FAN2012MPX through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN2012MPX 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 FAN2012MPX reliable?
The price and inventory of FAN2012MPX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN2012MPX is usually 5 days.
3.What payment methods are accepted for FAN2012MPX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN2012MPX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN2012MPX?
FAN2012MPX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN2012MPX 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 FAN2012MPX?
For technical support, including FAN2012MPX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN2012MPX requirements.
6.How does Aetrix verify that FAN2012MPX is sourced from the original manufacturer or authorized distributors?
All FAN2012MPX 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 FAN2012MPX meets industry standards.
7.What is the process for return or replacement of FAN2012MPX?
All FAN2012MPX units undergo pre-shipment inspection (PSI). If there is an issue with FAN2012MPX, 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 FAN2012MPX part is unused and in its original packaging.
Return procedure for FAN2012MPX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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