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Microchip Technology MIC4950YFM-TR
- Part No.:
- MIC4950YFM-TR
- Manufacturer:
- Microchip Technology
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
MIC4950YFM-TR.pdf
- Description:
- IC REG BUCK ADJ 5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,713
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Product details
Overview
MIC4950YFM-TR from Micrel is a 5A synchronous buck regulator with Hyper Speed Control™ architecture, designed for processor core and I/O voltage regulation from 3.3V or 5V input buses. It delivers up to 95% efficiency at 3.3MHz switching frequency, supports 0.7V–5.5V output range via external feedback, and features safe pre-biased start-up, Power Good output, and thermal/short-circuit protection.
For engineers reviewing the MIC4950YFM-TR datasheet, MIC4950YFM-TR pinout, MIC4950YFM-TR application, or MIC4950YFM-TR equivalent, key selection criteria include its 8-pin SOIC package, 2.7–5.5V input range, 5A continuous output, ultra-fast transient response, and integrated low-RDS(ON) MOSFETs enabling compact high-frequency DC-DC designs.
Technical Context
The MIC4950YFM-TR implements a proprietary ripple-based adaptive Constant-ON-Time control scheme with minimum ON-time (665 ns typ), maximum ON-time, and minimum OFF-time (176 ns typ) timers. Regulation shifts between valley-mode (low duty cycle) and peak-mode (high duty cycle) depending on input voltage and load conditions.
It integrates P-channel and N-channel synchronous MOSFETs with RDS(ON) of 30 mΩ and 25 mΩ respectively, uses separate AVIN/AGND and PVIN/PGND rails to isolate analog reference noise from power switching transients, and includes internal ripple injection eliminating need for external ripple injection in most configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports direct regulation from standard 3.3V or 5V system rails without intermediate stages. |
| Output Current | 5A continuous - sufficient for modern processor cores, FPGAs, and ASIC I/O domains. |
| Switching Frequency | Up to 3.3MHz - enables use of sub-2.2µH inductors and ≤10µF ceramic output capacitors for space-constrained designs. |
| Feedback Reference | 0.625V ±1.5% - sets precise output voltage via external resistor divider; supports outputs as low as 0.7V. |
| Efficiency | Up to 95% - achieved using low-RDS(ON) integrated MOSFETs and optimized gate drive minimizing switching losses. |
| Shutdown Current | 0.01µA - enables ultra-low-power standby states in battery-backed or energy-sensitive systems. |
| Thermal Shutdown | 150°C with 20°C hysteresis - protects against sustained overload or poor heatsinking without latch-up. |
Pinout & Package
Package: 8-pin SOIC (YFM suffix), body size 4.9mm × 6.0mm, exposed pad not present, RoHS-compliant Pb-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | PGND | Power ground return for high-current SW node; must be connected to low-impedance ground plane with short trace. |
| 2 | PVIN | Main power input (2.7–5.5V); requires ≥10µF ceramic bypass capacitor to PGND. |
| 3 | AVIN | Analog supply input; powers internal reference and error amplifier; decoupled with 1µF ceramic to AGND. |
| 4 | AGND | Analog ground reference; kept separate from PGND and tied at single point to avoid noise coupling. |
| 5 | FB | Feedback input; compares output voltage (via resistive divider) to 0.625V internal reference for regulation. |
| 6 | PG | Open-drain Power Good output; asserts logic high when VOUT reaches ≥88% of target; requires external pull-up. |
| 7 | EN | Enable input; logic high (>0.8V) activates regulator; logic low (<0.5V) disables with 0.01µA quiescent current. |
| 8 | SW | Switch node output; connects directly to inductor; carries high di/dt switching current; must be routed away from sensitive nodes. |
Key Features
| Feature | Design Value |
|---|---|
| Hyper Speed Control™ topology | Adaptive constant-ON-time control with mode transition ensures stable regulation across wide VIN/VOUT ranges and load steps. |
| Synchronous rectification | Integrated P/N-channel MOSFETs eliminate external catch diode, reducing conduction loss and improving light-load efficiency. |
| Pre-biased output start-up | Allows safe enable into existing output voltage - critical for hot-swap and multi-rail sequencing applications. |
| Internal ripple injection | Eliminates need for external RC network on FB pin in typical configurations, simplifying layout and BOM. |
| Separate AVIN/AGND and PVIN/PGND | Minimizes noise coupling from power switching into analog control loop, improving PSRR and output voltage accuracy. |
Applications
| DTV Power Management | Set-Top Box Core Supply |
|---|---|
Use Scenario: Regulating 1.2V/1.8V core and I/O voltages for SoC in digital television receivers with tight board space and thermal constraints. IC Role / Device Role / Timing Role: Primary synchronous buck converter delivering up to 5A with fast transient response to handle video processing load bursts. Use Value: 3.3MHz operation allows 1µH inductor and 10µF ceramic output cap, reducing solution footprint by >40% vs. 500kHz alternatives. | Use Scenario: Providing stable 2.5V/3.3V rail for tuner, demodulator, and memory interfaces in cable/satellite set-top boxes. IC Role / Device Role / Timing Role: High-efficiency step-down regulator operating from 5V bus, featuring Power Good signaling for system power sequencing. Use Value: 95% peak efficiency and 0.01µA shutdown current extend standby battery life and reduce thermal load in enclosed chassis. |
| Printer Engine Controller | DVD Player System Rail |
Use Scenario: Supplying 1.8V FPGA configuration voltage and 3.3V interface rail in laser printer main controller boards. IC Role / Device Role / Timing Role: Synchronous buck regulator supporting pre-biased start-up during hot-plug firmware updates and dynamic voltage scaling. Use Value: Safe start-up into pre-biased output prevents reverse current flow and ensures deterministic power-on behavior during field service. | Use Scenario: Generating 1.2V DDR memory and 2.5V video decoder supplies in consumer DVD/Blu-ray players. IC Role / Device Role / Timing Role: Compact, high-frequency DC-DC converter enabling dense PCB layouts while maintaining low output ripple under dynamic video loads. Use Value: Ultra-low output voltage ripple (<10mVpp) eliminates need for additional LC filtering, reducing component count and EMI emissions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4420AGL-Z | 4A rated, 2.5MHz max switching frequency, 3mm × 4mm QFN-12, 0.8V reference | Limited peak current headroom for 5A processor loads; lower switching frequency increases inductor size | Preferred where smaller package and AEC-Q200 qualification are required, but derating needed for sustained 5A. |
| TPS54560BQPWPRQ1 | 5.5A rated, 100kHz–2.5MHz adjustable frequency, SOIC-8, 0.8V reference, integrated compensation | Lower max frequency limits capacitor/inductor miniaturization; higher quiescent current (120µA) | Chosen when automotive qualification (AEC-Q100) and wide frequency adjustability outweigh need for ultra-high-frequency operation. |
Compared with MPQ4420AGL-Z and TPS54560BQPWPRQ1, the MIC4950YFM-TR provides higher switching frequency (3.3MHz) and lower shutdown current (0.01µA), enabling smaller passive components and longer battery standby time - critical for space- and energy-constrained consumer electronics.
Availability
MIC4950YFM-TR is available at Aetrix Electronics and suitable for DTVs, set-top boxes, printers, DVD players, and distributed power supplies requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for MIC4950YFM-TR 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
Micrel Inc. was a U.S.-based semiconductor company specializing in power management, timing, and interface ICs before its acquisition by Microchip Technology in 2015.
The MIC4950YFM-TR belongs to Micrel's Hyper Speed Control™ synchronous buck regulator family, engineered for high-frequency, high-current point-of-load conversion in consumer and computing applications where small size and fast transient response are essential.
FAQ
What is the maximum recommended input voltage for MIC4950YFM-TR?
The absolute maximum PVIN rating for MIC4950YFM-TR is 6V, but the specified operating input voltage range is 2.7V to 5.5V. Exceeding 5.5V may trigger overvoltage protection or cause permanent damage. For reliable operation in 5V bus applications, ensure input ripple stays within this window - the MIC4950YFM-TR is optimized for clean 3.3V or 5V inputs.
Does MIC4950YFM-TR support forced PWM or power-save mode operation?
No, MIC4950YFM-TR does not offer user-selectable PWM/powersave modes. It operates exclusively in synchronous buck mode using its proprietary Hyper Speed Control™ ripple-based regulation. At light loads, it naturally transitions between valley- and peak-mode control to maintain stability without entering discontinuous conduction mode (DCM) or pulse-skipping.
Can MIC4950YFM-TR be used with an output capacitor smaller than 10µF?
The MIC4950YFM-TR is characterized and guaranteed for stable operation with ≥10µF ceramic output capacitance. Using smaller values risks violating phase margin requirements, increasing output ripple beyond specification, and degrading transient response. While some lab tests show marginal stability with 4.7µF, Micrel's design guidelines and Typical Application circuit specify 10µF as the minimum validated value for all operating conditions.
What is the purpose of the AVIN and AGND pins on MIC4950YFM-TR?
The AVIN and AGND pins supply and reference the internal analog circuitry - including the 0.625V bandgap reference, error amplifier, and PWM comparator - isolating them from high-noise power switching paths. AVIN must be decoupled with a 1µF ceramic capacitor to AGND, and AGND must be connected to a quiet ground plane, separate from PGND except at a single-point tie to prevent noise injection into regulation feedback.
Is MIC4950YFM-TR pin-compatible with MIC4950YFL?
No, MIC4950YFM-TR (8-pin SOIC) and MIC4950YFL (10-pin 3mm × 4mm DFN) have different pin counts, pinouts, and thermal characteristics. The SOIC version uses dedicated PGND and PVIN pins, while the DFN integrates multiple PGND/EP connections. Layout, thermal vias, and decoupling strategies differ significantly - they are functionally equivalent but not mechanically or electrically interchangeable without PCB redesign.
MIC4950YFM-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- Hyper Speed Control®
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.625V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 5A
- Frequency - Switching:
- Up to 3.3MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MIC4950YFM-TR FAQ
1.How can I place an order for MIC4950YFM-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC4950YFM-TR 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 MIC4950YFM-TR reliable?
The price and inventory of MIC4950YFM-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC4950YFM-TR is usually 5 days.
3.What payment methods are accepted for MIC4950YFM-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC4950YFM-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC4950YFM-TR?
MIC4950YFM-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC4950YFM-TR 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 MIC4950YFM-TR?
For technical support, including MIC4950YFM-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC4950YFM-TR requirements.
6.How does Aetrix verify that MIC4950YFM-TR is sourced from the original manufacturer or authorized distributors?
All MIC4950YFM-TR 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 MIC4950YFM-TR meets industry standards.
7.What is the process for return or replacement of MIC4950YFM-TR?
All MIC4950YFM-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC4950YFM-TR, 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 MIC4950YFM-TR part is unused and in its original packaging.
Return procedure for MIC4950YFM-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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