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Microchip Technology MIC4950YFL-TR
- Part No.:
- MIC4950YFL-TR
- Manufacturer:
- Microchip Technology
- Package:
- 10-VDFN Exposed Pad
- Datasheet:
-
MIC4950YFL-TR.pdf
- Description:
- IC REG BUCK ADJ 5A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,350
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Product details
Overview
MIC4950YFL-TR from Micrel (now Microchip) is a synchronous buck regulator delivering 5A output current with Hyper Speed Control™ ripple-based regulation, supporting input voltages from 2.7V to 5.5V and output voltages as low as 0.7V. It operates up to 3.3MHz, achieves up to 95% peak efficiency, and features safe start-up into pre-biased outputs-ideal for powering processor I/O rails in set-top boxes and digital TVs.
For engineers reviewing the MIC4950YFL-TR datasheet, MIC4950YFL-TR pinout, MIC4950YFL-TR application, or MIC4950YFL-TR equivalent, key selection considerations include its 10-pin 3mm × 4mm DFN package, integrated low-RDS(ON) MOSFETs (30Ω P-channel / 25Ω N-channel), Power Good open-drain output, and ultra-fast transient response enabled by adaptive Constant-ON-Time control.
Technical Context
The MIC4950YFL-TR implements a proprietary ripple-based control architecture with three timing limits: minimum ON time (665 ns typ at VIN = 4.5V), maximum ON time, and minimum OFF time (176 ns typ). Regulation shifts between valley-controlled Constant-ON-Time mode at low duty cycles and peak-controlled ON-time modulation mode at higher duty cycles-enabling stable operation across wide input/output combinations without external ripple injection.
It integrates dual MOSFET power switches, a precision 0.625V feedback reference (±2.3% over temperature), thermal shutdown at 150°C with 20°C hysteresis, and current limit threshold adjustable via FB voltage (5.5–10A range). The separate AVIN/AGND and PVIN/PGND domains enforce analog-noise isolation critical for high-frequency stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 5A continuous-supports high-current processor I/O rails without external current boosting. |
| Input Voltage Range | 2.7V to 5.5V-compatible with 3.3V and 5V system buses, enabling single-supply flexibility. |
| Switching Frequency | Up to 3.3MHz-enables use of tiny 1µH inductors and 10µF ceramic output capacitors, minimizing board area. |
| Feedback Reference | 0.625V ±2.3% (–40°C to +125°C)-sets precise output voltage via external resistor divider; supports 0.7V–5V programmable range. |
| Efficiency | Up to 95% at 5A-minimizes thermal load in space-constrained consumer electronics enclosures. |
| 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-prevents thermal runaway during overload or poor heatsinking conditions. |
Pinout & Package
Package: 10-pin 3mm × 4mm DFN (exposed pad), RoHS-compliant, NiPdAu lead finish, –40°C to +125°C junction temperature rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, EP | PGND | Power ground return for high-current SW node-must be connected to low-impedance thermal pad for thermal and EMI performance. |
| 3, 8 | PVIN | High-current input supply pin-internally tied in DFN; requires ≥10µF ceramic decoupling to PGND. |
| 4 | AVIN | Analog supply for control circuitry-requires dedicated 1µF ceramic capacitor to AGND to isolate switching noise. |
| 5 | AGND | Analog ground reference-must be isolated from PGND except at single-point connection to avoid noise coupling. |
| 6 | FB | Feedback input-compares output voltage (via resistor divider) to 0.625V internal reference; accepts external ripple injection if needed. |
| 7 | PG | Open-drain Power Good output-asserts logic high when VOUT reaches ≥88% of target; requires external pull-up to VOUT or bias rail. |
| 9 | EN | Enable input-logic high (>0.8V) enables regulation; logic low (<0.5V) disables with 0.01µA quiescent current; must not float. |
| 10 | SW | Switch node output-drives external inductor; high dv/dt requires short, shielded routing away from sensitive analog traces. |
Key Features
| Feature | Design Value |
|---|---|
| Hyper Speed Control™ architecture | Adaptive ripple-based control with automatic mode transition ensures stable regulation across 0.7V–5V outputs and 2.7V–5.5V inputs without compensation tuning. |
| Safe pre-biased start-up | Enables reliable power sequencing in multi-rail systems where output capacitor is already charged-prevents reverse current flow or latch-up. |
| Integrated low-RDS(ON) MOSFETs | 30Ω (P-ch) / 25Ω (N-ch) typical RDS(ON) reduces conduction losses and eliminates need for external power switches. |
| Power Good (PG) indicator | Open-drain PG output provides system-level power status monitoring with programmable threshold (82–94% of VOUT) and 7% hysteresis. |
| Ultra-low shutdown current | 0.01µA shutdown current enables long-term battery backup or always-on subsystems without significant leakage drain. |
Applications
| DTV Power Rails | Set-Top Box Core Supply |
|---|---|
|
Use Scenario: Providing stable 1.2V/1.8V core and I/O voltages to SoC and memory interfaces in digital television platforms. IC Role / Device Role / Timing Role: Primary synchronous buck regulator managing dynamic load steps up to 5A during video decode bursts. Use Value: 3.3MHz switching minimizes output ripple and enables compact 10µF ceramic output capacitance-reducing BOM cost and PCB footprint. |
Use Scenario: Delivering tightly regulated 2.5V/3.3V rails to tuners, demodulators, and HDMI transceivers in cable/satellite receivers. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter with Power Good signaling for system power sequencing and fault detection. Use Value: Safe start-up into pre-biased outputs prevents bus contention during hot-plug or multi-stage power-up sequences. |
| Printer Engine Control | Distributed Power Architecture |
|
Use Scenario: Supplying 5A peak current to stepper motor drivers and ASICs in laser printer engine control boards. IC Role / Device Role / Timing Role: High-current DC-DC regulator handling repetitive 0–5A load transients during print head movement and fuser activation. Use Value: Ultra-fast transient response maintains <±1% output deviation during 4A/µs load steps-ensuring consistent motor torque and timing accuracy. |
Use Scenario: Local regulation of 1.8V/2.5V rails from a 5V backplane in modular industrial controllers or network switches. IC Role / Device Role / Timing Role: Compact, thermally efficient buck stage replacing discrete FET+controller solutions in distributed power designs. Use Value: DFN-10 package with exposed thermal pad achieves θJA = 35°C/W-enabling 5A operation without forced air or large heatsinks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2359DJ-LF-Z | 4A rated, 2.2MHz max frequency, 0.8V reference, no PG output, SOIC-8 only. | Lacks Power Good signal and pre-biased start-up; lower current rating limits use in 5A processor I/O rails. | Select when PG signaling and 5A capability are non-critical and SOIC-8 layout compatibility is required. |
| TPS54560QDGQRQ1 | 5A rated, 100kHz–2.5MHz adjustable frequency, 0.8V reference, integrated soft-start, automotive-grade (-40°C to +125°C). | Requires external compensation; lacks Hyper Speed Control's auto-mode transition; larger SOIC-10 package. | Prefer for automotive environments requiring AEC-Q100 qualification and adjustable frequency, but accept added design complexity. |
Compared with MP2359DJ-LF-Z and TPS54560QDGQRQ1, the MIC4950YFL-TR delivers higher integration (integrated PG, pre-bias start, no compensation needed), superior transient response due to ripple-based control, and smaller DFN-10 footprint-making it optimal for space-constrained consumer electronics demanding plug-and-play 5A regulation.
Availability
MIC4950YFL-TR 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 RoHS-compliant packaging.
Supply support for MIC4950YFL-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., acquired by Microchip Technology in 2015, specialized in high-performance analog, power management, and timing ICs for consumer, industrial, and communications markets.
The MIC4950 product line was designed specifically for high-frequency, high-current point-of-load regulation in space-constrained consumer electronics-emphasizing minimal external components, fast transient response, and seamless integration into 3.3V/5V bus architectures.
FAQ
What is the maximum supported switching frequency of the MIC4950YFL-TR?
The MIC4950YFL-TR supports a maximum switching frequency of 3.3MHz under typical operating conditions. This high frequency enables use of small 1µH inductors and 10µF ceramic output capacitors while maintaining low output voltage ripple across the full 0–5A load range. Frequency varies with input voltage and load per the device's adaptive ripple-based control scheme.
Does the MIC4950YFL-TR support start-up into a pre-biased output?
Yes, the MIC4950YFL-TR supports safe start-up into a pre-biased output-a critical feature for systems with multiple power rails or hot-swap requirements. Its internal circuitry prevents reverse current flow and ensures controlled ramp-up even when the output capacitor is initially charged to a voltage near the target output level.
What is the function of the AVIN and AGND pins on the MIC4950YFL-TR?
The AVIN pin supplies clean analog power to the internal reference, error amplifier, and control logic, while AGND serves as the dedicated analog ground return. These pins must be decoupled with a 1µF ceramic capacitor and kept physically isolated from power-ground paths to prevent switching noise from degrading regulation accuracy and stability.
How does the Power Good (PG) output of the MIC4950YFL-TR operate?
The PG pin is an open-drain output that asserts logic high when the regulated output voltage reaches ≥88% of its nominal value (with 7% hysteresis). It requires an external pull-up resistor (≥10kΩ) to VOUT or another bias rail. This signal enables system-level power sequencing, fault detection, and reset coordination in complex multi-rail designs.
What thermal performance can be expected from the MIC4950YFL-TR in its DFN-10 package?
In its 3mm × 4mm DFN-10 package with exposed thermal pad, the MIC4950YFL-TR achieves a junction-to-ambient thermal resistance (θJA) of 35°C/W under standard PCB layout conditions. This allows continuous 5A operation at ambient temperatures up to +85°C without forced airflow-provided the thermal pad is properly soldered to a sufficient copper pour.
MIC4950YFL-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- Hyper Speed Control®
- Package/Case:
- 10-VDFN Exposed Pad
- 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:
- 10-DFN (3x4)
MIC4950YFL-TR FAQ
1.How can I place an order for MIC4950YFL-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC4950YFL-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 MIC4950YFL-TR reliable?
The price and inventory of MIC4950YFL-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC4950YFL-TR is usually 5 days.
3.What payment methods are accepted for MIC4950YFL-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC4950YFL-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC4950YFL-TR?
MIC4950YFL-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC4950YFL-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 MIC4950YFL-TR?
For technical support, including MIC4950YFL-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC4950YFL-TR requirements.
6.How does Aetrix verify that MIC4950YFL-TR is sourced from the original manufacturer or authorized distributors?
All MIC4950YFL-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 MIC4950YFL-TR meets industry standards.
7.What is the process for return or replacement of MIC4950YFL-TR?
All MIC4950YFL-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC4950YFL-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 MIC4950YFL-TR part is unused and in its original packaging.
Return procedure for MIC4950YFL-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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