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Microchip Technology MIC4950YFM-T5
- Part No.:
- MIC4950YFM-T5
- Manufacturer:
- Microchip Technology
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
MIC4950YFM-T5.pdf
- Description:
- IC REG BUCK ADJ 5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,437
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Product details
Overview
MIC4950YFM-T5 from Micrel is a 5A synchronous buck regulator with Hyper Speed Control™ architecture, operating from 2.7V–5.5V input to deliver adjustable output voltages as low as 0.7V. It achieves up to 95% efficiency at 3.3MHz switching frequency and supports safe start-up into pre-biased outputs-ideal for powering processor I/O rails in set-top boxes and DTVs.
For engineers reviewing the MIC4950YFM-T5 datasheet, MIC4950YFM-T5 pinout, MIC4950YFM-T5 application, or MIC4950YFM-T5 equivalent, key selection criteria include its 8-pin SOIC package, integrated low-RDS(ON) MOSFETs (30Ω P-channel / 25Ω N-channel), ultra-fast transient response, and thermal shutdown protection across –40°C to +125°C junction temperature.
Technical Context
The MIC4950YFM-T5 implements a proprietary ripple-based control loop with adaptive Constant-ON-Time and ON-time modulation modes, enabling stable regulation across wide duty cycles. Its dual ground system separates PGND (high-current return) from AGND (low-noise analog reference), requiring single-point connection per layout guidelines.
It features internal feedback reference of 0.625V (±2.6%), programmable via external resistor divider, and includes open-drain Power Good (PG) output with 88% threshold and 7% hysteresis. Input under-voltage lockout triggers at 2.5V (±0.1V) with 400mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports direct operation from 3.3V or 5V system buses without intermediate regulation. |
| Output Current | 5A continuous - sufficient for high-current processor I/O and core supply rails in consumer electronics. |
| Switching Frequency | Up to 3.3MHz - enables use of small 1µH inductors and 10µF ceramic output capacitors, minimizing board area. |
| Efficiency | Up to 95% - reduces thermal load and improves power density in space-constrained applications. |
| Feedback Reference | 0.625V ±2.6% - sets precise output voltage via external resistor divider; supports outputs down to 0.7V. |
| Shutdown Current | 0.01µA - enables ultra-low-power standby states in battery-backed or always-on systems. |
| Junction Temp Range | –40°C to +125°C - qualified for industrial and extended-temperature consumer environments. |
Pinout & Package
Package: 8-pin SOIC (YFM suffix), body size 4.9mm × 3.9mm × 1.45mm, lead pitch 1.27mm, 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 (2.7V–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 except at single-point tie 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 ≥ 88% of nominal; 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-frequency, high-di/dt current; routed away from sensitive nodes. |
Key Features
| Feature | Design Value |
|---|---|
| Hyper Speed Control™ topology | Adaptive Constant-ON-Time + ON-time modulation ensures stable regulation across full load and input range without external compensation. |
| Safe pre-biased start-up | Allows reliable turn-on when output capacitor is already charged - critical for hot-swap and multi-rail sequencing systems. |
| Integrated MOSFETs | Low RDS(ON) (30Ω P-ch / 25Ω N-ch) minimizes conduction loss and eliminates need for external power switches. |
| Thermal & current protection | Internal thermal shutdown at 150°C with 20°C hysteresis and cycle-by-cycle current limiting up to 7.5A typical. |
| Ultra-low shutdown current | 0.01µA enables long-term battery backup or energy harvesting applications without significant leakage drain. |
Applications
| DTV Power Rails | Set-Top Box Core Supply |
|---|---|
Use Scenario: Providing stable 1.2V/1.8V/2.5V rails for video processing SoCs and memory interfaces in digital television platforms. IC Role / Device Role / Timing Role: Primary synchronous buck converter delivering regulated core and I/O voltages from 3.3V or 5V backplane. Use Value: 3.3MHz operation enables compact 1µH inductor + 10µF ceramic output capacitor solution, reducing BOM count and PCB footprint. | Use Scenario: Powering ARM-based application processors and DDR memory in cable/satellite set-top boxes with tight thermal constraints. IC Role / Device Role / Timing Role: High-efficiency DC-DC step-down regulator supporting dynamic voltage scaling and fast load transients during channel changes. Use Value: Ultra-fast transient response and pre-biased start-up ensure clean power delivery during rapid CPU frequency transitions and cold-boot sequences. |
| Printer Engine Control | Distributed Power Architecture |
Use Scenario: Generating 3.3V and 5V auxiliary supplies for motor drivers, sensors, and communication interfaces in multifunction printers. IC Role / Device Role / Timing Role: Secondary buck regulator in multi-output power tree, fed from main 12V or 24V rail via intermediate 5V bus. Use Value: Wide input range (2.7V–5.5V) allows direct use of existing 3.3V/5V distribution, eliminating extra conversion stages and improving overall system efficiency. | Use Scenario: Local point-of-load regulation for FPGA I/O banks or ASIC peripherals in modular embedded systems with distributed 5V power planes. IC Role / Device Role / Timing Role: Compact, high-frequency POL regulator placed near load to minimize IR drop and improve noise immunity. Use Value: 8-pin SOIC package and minimal external components (1 inductor, 2 caps, 2 resistors) simplify layout and reduce design cycle time for custom carrier boards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2359DJ-LF-Z | 4A rated, 2MHz max switching frequency, 0.8V feedback reference, no PG output | Lacks Power Good signal and pre-biased start-up; lower current rating limits use in 5A processor I/O rails | Select when cost sensitivity outweighs need for PG monitoring and full 5A capability. |
| TPS54560BQDDAQ1 | 5A rated, 100kHz–2.5MHz adjustable frequency, 0.8V reference, integrated soft-start, automotive AEC-Q100 Grade 1 | Higher minimum frequency, wider VIN range (3.5V–60V), automotive-qualified but larger 8-pin SO-PowerPAD package | Select for automotive infotainment or industrial systems requiring extended input range and AEC-Q100 compliance. |
Compared with MP2359DJ-LF-Z and TPS54560BQDDAQ1, the MIC4950YFM-T5 offers higher switching frequency (3.3MHz vs ≤2.5MHz), lower feedback reference (0.625V vs 0.8V) for sub-1V outputs, and native pre-biased start-up-making it optimal for space-constrained consumer electronics where fast transient response and minimal external components are prioritized.
Availability
MIC4950YFM-T5 is available at Aetrix Electronics and suitable for DTVs, set-top boxes, and printer engine control systems requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for MIC4950YFM-T5 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-T5 belongs to Micrel's Hyper Speed Control™ buck regulator product line, designed specifically for high-frequency, high-current point-of-load applications in consumer electronics where minimal external components and fast transient response are essential.
FAQ
What is the maximum recommended switching frequency for MIC4950YFM-T5?
The MIC4950YFM-T5 supports a maximum switching frequency of 3.3MHz under typical operating conditions. This value is confirmed in the Electrical Characteristics table and validated across temperature (–40°C to +125°C) and load (0–5A). Operation at 3.3MHz enables use of 1µH inductors and 10µF ceramic output capacitors while maintaining stability and low output ripple. The actual frequency varies slightly with input voltage and load due to its adaptive ripple-based control architecture.
Does MIC4950YFM-T5 support start-up into a pre-biased output?
Yes, MIC4950YFM-T5 explicitly supports safe start-up into a pre-biased output, as stated in both the General Description and Features sections of the datasheet. This function prevents reverse current flow during turn-on when the output capacitor is already charged, making MIC4950YFM-T5 suitable for systems with multi-rail power sequencing or hot-swap requirements. No external circuitry is needed to enable this feature.
What is the feedback reference voltage of MIC4950YFM-T5 and how is it used?
The MIC4950YFM-T5 has an internal feedback reference voltage of 0.625V (typical), with a min/max range of 0.609V to 0.640V. This reference is compared against the divided output voltage at the FB pin to regulate the output. To set a target output voltage (e.g., 1.8V), users apply Equation 1: VOUT = VREF × (1 + R1/R2). Table 1 in the datasheet provides verified resistor pairs for common output voltages from 1.0V to 3.3V.
What protection features are integrated into MIC4950YFM-T5?
MIC4950YFM-T5 integrates overcurrent protection via cycle-by-cycle current limiting (typical limit 7.5A), thermal shutdown at 150°C with 20°C hysteresis, input under-voltage lockout (UVLO) with 2.5V turn-on threshold and 400mV hysteresis, and safe pre-biased start-up. It also includes a Power Good (PG) output for system-level monitoring. These protections operate autonomously without external components and are fully characterized across the –40°C to +125°C junction temperature range.
Can MIC4950YFM-T5 be used with ceramic output capacitors smaller than 10µF?
No - the MIC4950YFM-T5 is specifically designed for use with a minimum 10µF ceramic output capacitor, as stated in the General Description and Applications Information sections. Using smaller values may compromise stability, increase output ripple beyond specification, and degrade transient response. The internal ripple injection network and control loop dynamics assume ≥10µF capacitance; deviation requires external ripple injection and careful validation per Figure 1 and Equations 6–8 in the datasheet.
MIC4950YFM-T5 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-T5 FAQ
1.How can I place an order for MIC4950YFM-T5 through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC4950YFM-T5 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-T5 reliable?
The price and inventory of MIC4950YFM-T5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC4950YFM-T5 is usually 5 days.
3.What payment methods are accepted for MIC4950YFM-T5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC4950YFM-T5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC4950YFM-T5?
MIC4950YFM-T5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC4950YFM-T5 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-T5?
For technical support, including MIC4950YFM-T5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC4950YFM-T5 requirements.
6.How does Aetrix verify that MIC4950YFM-T5 is sourced from the original manufacturer or authorized distributors?
All MIC4950YFM-T5 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-T5 meets industry standards.
7.What is the process for return or replacement of MIC4950YFM-T5?
All MIC4950YFM-T5 units undergo pre-shipment inspection (PSI). If there is an issue with MIC4950YFM-T5, 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-T5 part is unused and in its original packaging.
Return procedure for MIC4950YFM-T5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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