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onsemi FAN2012EMPX
- Part No.:
- FAN2012EMPX
- Manufacturer:
- onsemi
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
FAN2012EMPX.pdf
- Description:
- IC REG BUCK ADJ 1.5A 6MLP
- Quantity:
- Payment:
- Shipping:
Inventory:2,719
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Product details
Overview
FAN2012EMPX from onsemi (formerly Fairchild) is a 1.5 A, current-mode synchronous PWM buck regulator optimized for low-voltage point-of-load conversion. It operates from 4.5 V to 5.5 V input, delivers adjustable output from 0.8 V to 3.5 V, and features fixed 1.3 MHz switching frequency, soft-start, and thermal shutdown - used in notebook computers and set-top boxes.
For engineers reviewing the FAN2012EMPX datasheet, pinout, applications, or equivalent options, key selection criteria include its -40°C to +85°C operating range, 3×3 mm MLP package, 1.5 A continuous output, current-limit threshold of 2.2–3.5 A, and ±3% output voltage accuracy over temperature and load.
Technical Context
The FAN2012EMPX implements a current-mode control architecture with cycle-by-cycle peak current limiting and internal 0.8 V reference. Its 1.3 MHz fixed-frequency PWM operation enables compact external LC filtering using standard 3.3 µH inductors and ceramic capacitors.
It integrates complementary P-channel and N-channel MOSFETs with typical RON of 150–290 mΩ each, supports enable-controlled shutdown (<1 µA IQ), and includes under-voltage lockout (UVLO) with 3.4–4.0 V threshold and 150 mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 5.5 V - matches standard 5 V rail with margin for droop and ripple. |
| Output Voltage Range | 0.8 V to 3.5 V - supports core voltages for modern processors and I/O rails. |
| Max Output Current | 1.5 A continuous - sufficient for FPGA I/O banks or ASIC subsystems. |
| Switching Frequency | 1.3 MHz (typical) - allows use of small 3.3 µH inductors and low-ESR ceramic caps. |
| Output Accuracy | ±3% over -40°C to +85°C - ensures stable regulation across industrial temperature range. |
| Shutdown Current | <1 µA - enables ultra-low-power system sleep states. |
| UVLO Threshold | 3.4–4.0 V rising - prevents erratic startup during brown-out conditions. |
Pinout & Package
Package: 3×3 mm, 6-lead molded leadless package (MLP) with exposed thermal pad (DAP). Designed for high thermal efficiency in space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB | Feedback Input | Connects to resistor divider to set output voltage; references internal 0.8 V bandgap. |
| PGND | Power Ground | Return path for internal MOSFET switches; must be tied externally to AGND with low-inductance connection. |
| SW | Switching Node | Drain connection of internal P-MOSFET and source of N-MOSFET; drives external inductor. |
| PVIN | Power Supply Input | High-current input path for internal power switches; decoupled separately from VIN. |
| VIN | Supply Voltage Input | Bias supply for control circuitry; requires local 10 µF ceramic bypass capacitor. |
| 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 rectification | Integrated P/N-MOSFET pair eliminates external diode, enabling >95% peak efficiency at 1.2 V/1 A. |
| Current-mode control | Provides inherent cycle-by-cycle current limiting and fast transient response to load steps. |
| Soft-start | Digital four-step ramp limits inrush current, preventing input rail collapse and output overshoot. |
| Thermal shutdown | Activates at 150°C junction temperature with 20°C hysteresis to protect against sustained overload. |
| Short-circuit protection | Reduces switching frequency to ~400 kHz and enforces minimum duty cycle during output fault. |
Applications
| Hard Disk Drive Power | Notebook Computer Core Rail |
|---|---|
Use Scenario: Regulating 1.2 V or 1.5 V for HDD controller ICs and motor drivers. IC Role / Device Role / Timing Role: Primary synchronous buck converter delivering clean, tightly regulated low-voltage power. Use Value: High efficiency (>90% at 1.2 V/1 A) minimizes heat in sealed drive enclosures; 1.3 MHz switching avoids audible noise. |
Use Scenario: Generating CPU I/O or memory interface voltage in ultraportable notebooks. IC Role / Device Role / Timing Role: Point-of-load regulator placed near processor BGA for minimal trace inductance. Use Value: Compact 3×3 mm MLP footprint saves board area; ±3% accuracy maintains SoC timing margins across temperature. |
| Set-Top Box SoC Supply | Communications Equipment LDO Pre-regulator |
Use Scenario: Powering 3.3 V or 2.5 V logic rails in cable/satellite STB mainboards. IC Role / Device Role / Timing Role: Main DC-DC stage feeding downstream LDOs or directly powering digital ICs. Use Value: Adjustable output supports multiple SoC variants; 1.5 A capacity handles burst loads from video decoding. |
Use Scenario: Providing stable 3.3 V intermediate rail before low-noise LDOs in RF transceivers. IC Role / Device Role / Timing Role: Efficient pre-regulator reducing thermal load on sensitive analog/LDO stages. Use Value: Low output ripple (<5% during 700 mA ↔ 100 mA transients) preserves signal integrity in RF sections. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2104DJ-LF-Z | Fixed 3.3 V output; 1.5 A rating; 1.5 MHz switching; smaller 2×2 mm QFN-6 package. | Lacks adjustable output and EN pin; limited to single-rail designs. | Select when fixed 3.3 V simplifies design and board space is critical. |
| TPS54302DDCR | Wider 3.5–28 V input; 3 A output; adjustable frequency (200 kHz–2.2 MHz); integrated compensation. | Higher voltage capability and current headroom; more complex loop tuning. | Choose for systems requiring higher input range or future scalability beyond 1.5 A. |
Compared with MP2104DJ-LF-Z and TPS54302DDCR, the FAN2012EMPX offers precise -40°C to +85°C operation with adjustable output and proven 1.3 MHz stability in compact 3×3 mm layout - ideal for cost-sensitive, thermally constrained 5 V-input applications where flexibility matters.
Availability
FAN2012EMPX is available at Aetrix Electronics and suitable for notebook computer power, set-top box SoC supplies, hard disk drive controllers, and communications equipment requiring stable component supply despite end-of-life status.
Supply support for FAN2012EMPX 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 electronics, with leadership in power management, analog, and sensor technologies.
The FAN2012EMPX belongs to onsemi's legacy high-efficiency DC-DC converter product line, designed specifically for low-voltage, high-density point-of-load applications in consumer and computing systems.
FAQ
What is the operating temperature range of the FAN2012EMPX?
The FAN2012EMPX is rated for operation from -40°C to +85°C ambient temperature. This extended industrial range distinguishes it from the FAN2012MPX (0°C to +85°C) and makes it suitable for applications exposed to wider environmental conditions, such as outdoor set-top boxes or industrial notebooks. The FAN2012EMPX maintains ±3% output voltage accuracy across this full range.
Does the FAN2012EMPX require an external Schottky diode?
No, the FAN2012EMPX does not require an external Schottky diode because it integrates synchronous P-channel and N-channel MOSFETs. The internal N-MOSFET replaces the freewheeling diode, eliminating forward voltage drop and improving efficiency. An external Schottky may optionally be added from SW to PVIN to reduce switching spikes, but it is not required for basic operation of the FAN2012EMPX.
What is the recommended inductor value for the FAN2012EMPX?
The recommended inductor value for the FAN2012EMPX is 3.3 µH, as specified in the datasheet for optimal performance across load and input conditions. Inductors such as Panasonic ELL6PM3R3N, Murata LQS66C3R3M04, or Coiltronics SD-3R3-R are validated for use with the FAN2012EMPX. The inductor must support ≥1.5 A saturation current and low DC resistance to maintain high efficiency in the FAN2012EMPX design.
How does the FAN2012EMPX handle short-circuit conditions?
Under output short-circuit, the FAN2012EMPX activates cycle-by-cycle current limiting and reduces switching frequency to ~400 kHz while enforcing minimum duty cycle. This limits average input current to ~350 mA and prevents thermal runaway. The device remains operational but enters a safe, low-power fault state until the short is removed and UVLO resets - a behavior confirmed in the FAN2012EMPX datasheet's Short-Circuit Protection section.
Is the FAN2012EMPX still recommended for new designs?
No, the FAN2012EMPX is discontinued and not recommended for new designs, as explicitly stated in the official datasheet: "DISCONTINUED - THIS DEVICE IS NOT RECOMMENDED FOR NEW DESIGN." While Aetrix Electronics maintains limited legacy supply for existing production, engineers designing new systems should evaluate alternatives like the TPS54302DDCR or MP2104DJ-LF-Z, and consult onsemi for qualified replacements for the FAN2012EMPX.
FAN2012EMPX 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-MLP (3x3)
FAN2012EMPX FAQ
1.How can I place an order for FAN2012EMPX through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN2012EMPX 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 FAN2012EMPX reliable?
The price and inventory of FAN2012EMPX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN2012EMPX is usually 5 days.
3.What payment methods are accepted for FAN2012EMPX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN2012EMPX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN2012EMPX?
FAN2012EMPX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN2012EMPX 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 FAN2012EMPX?
For technical support, including FAN2012EMPX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN2012EMPX requirements.
6.How does Aetrix verify that FAN2012EMPX is sourced from the original manufacturer or authorized distributors?
All FAN2012EMPX 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 FAN2012EMPX meets industry standards.
7.What is the process for return or replacement of FAN2012EMPX?
All FAN2012EMPX units undergo pre-shipment inspection (PSI). If there is an issue with FAN2012EMPX, 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 FAN2012EMPX part is unused and in its original packaging.
Return procedure for FAN2012EMPX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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