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Microchip Technology MIC4722YML-TR
- Part No.:
- MIC4722YML-TR
- Manufacturer:
- Microchip Technology
- Package:
- 12-VFDFN Exposed Pad, 12-MLF®
- Datasheet:
-
MIC4722YML-TR.pdf
- Description:
- IC REG BUCK ADJ 3A 12MLF
- Quantity:
- Payment:
- Shipping:
Inventory:1,706
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Product details
Overview
MIC4722YML-TR from Micrel is a 3A, 2.7MHz PWM synchronous-capable (non-synchronous with external diode) buck regulator in a 12-pin 3mm × 3mm MLF® package. It operates from 2.7V–5.5V input, delivers adjustable output down to 1.0V, achieves >92% efficiency via integrated p-channel MOSFET (95–300 mΩ RDS(on)), and supports 100% duty cycle for low-dropout operation - used in XDSL modems, telecom point-of-load conversion, and video card power rails.
For engineers reviewing the MIC4722YML-TR datasheet, MIC4722YML-TR pinout, MIC4722YML-TR application, or MIC4722YML-TR equivalent, key selection criteria include its 2.7MHz switching frequency enabling ultra-small 0.47µH inductor + 4.7µF capacitor design, ±1% feedback voltage accuracy over temperature, PGOOD open-drain status signaling, and thermal/current protection with –40°C to +125°C junction range.
Technical Context
The MIC4722YML-TR implements fixed-frequency voltage-mode PWM control with proprietary internal Type III compensation, delivering closed-loop bandwidth exceeding 200kHz. Its architecture integrates a high-side p-channel MOSFET switch, error amplifier, soft-start, UVLO (2.55V turn-on, 100mV hysteresis), and logic-level enable with 0.85V threshold.
It operates in continuous conduction mode (CCM) up to full 3A load and transitions to discontinuous conduction mode (DCM) at light loads, enabling pulse-skipping for improved light-load efficiency. The device requires an external Schottky freewheeling diode and uses separate PGND and SGND pins to isolate high-current and signal-return paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports single-cell Li-ion, 3.3V/5V rail inputs without pre-regulation |
| Switching Frequency | 2.7MHz (typ), 2.4–3.0MHz (min–max) - enables compact LC filter with 0.47µH/4.7µF |
| Output Current | Up to 3A DC - sustained delivery with thermal shutdown at 150°C junction |
| Feedback Voltage | 1.00V (±1% at 25°C, ±2% over –40°C to +125°C) - sets output via resistor divider (VOUT = 1.0V × (1 + R1/R2)) |
| RDS(on) | 95–300 mΩ (typ–max at ISW = 50mA) - determines conduction loss; lower at higher VIN due to enhanced gate drive |
| Efficiency | >92% at 3.3VIN/1.8VOUT/3A - achieved via low-RDS(on) p-MOSFET and optimized gate drive |
| Duty Cycle Range | 0–100% - supports dropout conditions where VOUT ≈ VIN, e.g., 3.3V→3.0V conversion |
| PGOOD Threshold | ±7.5% regulation window - open-drain output pulls low when VOUT is within spec; requires external pull-up |
Pinout & Package
Package: Exposed-pad 12-pin 3mm × 3mm MLF® (MicroLeadFrame), RoHS-compliant, NiPdAu lead finish, halogen-free mold compound. Thermal pad (EP) must be soldered to PCB ground plane for thermal performance (θJA = 60°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 12 (SW) | Switch Node | Drives external inductor; connects to cathode of freewheeling diode; high dv/dt node requiring short, low-inductance routing |
| 2, 11 (VIN) | Power Input | Supplies p-MOSFET source and driver; each pin requires local 10µF ceramic bypass to PGND |
| 3, 10 (PGND) | Power Ground | High-current return path for MOSFET switching; must be low-impedance, separate from SGND |
| 4 (SGND) | Signal Ground | Analog reference return for FB, BIAS, EN, PGOOD; isolated from PGND to prevent noise coupling |
| 5 (BIAS) | Bias Supply | Powers internal reference/control circuitry; requires 10Ω series resistor from VIN and 0.1µF ceramic to SGND |
| 6 (FB) | Feedback Input | Connects to resistor divider; 1.0V reference enables precise output setting; high-impedance (1nA bias current) |
| 7 (NC) | No Connect | Not bonded internally; may be left floating or tied to SGND/PGND per layout needs |
| 8 (EN) | Enable Input | Active-high logic control; <0.5V disables (IQ < 10µA), >0.85V enables; 50mV hysteresis prevents chatter |
| 9 (PGOOD) | Power Good Output | Open-drain status flag; pulled low when VOUT is within ±7.5%; requires external pull-up resistor |
| EP | Thermal Pad | Internally connected to GND; must be soldered to large PCB copper area for thermal dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3A p-channel MOSFET | Eliminates external high-side switch; reduces BOM count and layout complexity vs. controller-only solutions |
| 2.7MHz fixed-frequency PWM | Enables use of sub-1µH inductors and <10µF output capacitance - critical for space-constrained XDSL and STB designs |
| Proprietary internal compensation | Removes need for external compensation network; stable with 0.47µH/4.7µF while achieving >200kHz closed-loop bandwidth |
| 100% duty cycle capability | Supports near-lossless LDO-like operation during brownout or low-VIN conditions without dropout failure |
| Separate PGND/SGND pins | Minimizes noise coupling between power-switching and analog control loops - improves regulation accuracy and transient response |
| Micropower shutdown | Reduces quiescent current to <10µA when disabled - essential for battery-backed or always-on telecom systems |
Applications
| 5V or 3.3V Point of Load Conversion | Telecom/Networking Equipment |
|---|---|
Use Scenario: Local DC-DC conversion on line card or baseband processor board supplying core voltage to FPGA or ASIC. IC Role / Device Role / Timing Role: Primary step-down regulator delivering tightly regulated 1.2V/1.8V/2.5V from 3.3V or 5V backplane rail. Use Value: High 2.7MHz switching enables small 0.47µH inductor footprint and fast transient response (<10µs recovery from 2A load step). | Use Scenario: Powering DSLAM line interface units or GPON ONT front-end circuitry requiring clean, efficient 3.3V/2.5V rails. IC Role / Device Role / Timing Role: Non-synchronous buck converter with external Schottky diode, operating at >2.4MHz to avoid interference with upstream/downstream data bands. Use Value: >92% efficiency at full load reduces thermal load in densely packed telecom chassis; PGOOD enables system-level power sequencing. |
| Set Top Boxes | Video Cards |
Use Scenario: Generating 1.2V CPU core and 1.8V memory supply from 12V or 5V intermediate rail in consumer STB mainboard. IC Role / Device Role / Timing Role: Adjustable-output buck regulator with feedback divider; supports dynamic voltage scaling via EN control. Use Value: 100% duty cycle allows reliable operation during 5V rail sag; thermal shutdown protects against enclosure overheating. | Use Scenario: Providing auxiliary 1.5V/1.8V GPU core voltage in compact PCIe graphics add-in cards. IC Role / Device Role / Timing Role: High-current (3A), high-frequency (2.7MHz) buck regulator with exposed thermal pad for direct heatsink attachment. Use Value: Compact 3mm × 3mm MLF® package fits tight board real estate; >92% efficiency minimizes localized heating near GPU die. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2307DN-LF-Z | 3A, 2MHz, integrated n-channel high-side + synchronous rectifier; no external diode needed; 0.12Ω RDS(on); requires external compensation. | Higher integration (synchronous), but larger solution size due to mandatory 4.7µH inductor and dual feedback caps; lacks 100% duty cycle. | Choose MP2307DN-LF-Z when synchronous operation and lower quiescent current (<250µA) are prioritized over minimum footprint and dropout capability. |
| TPS54302DDCR | 3A, 2.5MHz, integrated n-channel high-side + synchronous rectifier; 0.07Ω RDS(on); adjustable soft-start; requires external compensation. | Superior light-load efficiency (PFM mode), but wider 3mm × 3mm QFN has different pinout and no BIAS pin; not rated for 125°C junction. | Choose TPS54302DDCR for industrial designs needing extended temperature validation and adaptive frequency dithering, accepting trade-offs in layout flexibility and thermal margin. |
Compared with MP2307DN-LF-Z and TPS54302DDCR, the MIC4722YML-TR offers unique 100% duty cycle operation and internal compensation for minimal external components, making it optimal for space-constrained, dropout-sensitive telecom and embedded applications - though it requires an external Schottky diode and lacks synchronous rectification.
Availability
MIC4722YML-TR is available at Aetrix Electronics and suitable for telecom infrastructure, set-top box power management, and video card auxiliary supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MIC4722YML-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 analog and mixed-signal semiconductor company founded in 1978 and acquired by Microchip Technology in 2015. It specialized in power management, timing, and interface ICs for communications and industrial markets.
The MIC4722YML-TR belongs to Micrel's high-frequency buck regulator product line, designed specifically for next-generation broadband equipment (XDSL, GPON) demanding >2.4MHz switching, ultra-compact footprints, and robust thermal performance across –40°C to +125°C.
FAQ
What is the maximum output current capability of the MIC4722YML-TR?
The MIC4722YML-TR delivers up to 3A of continuous DC output current under typical thermal conditions (θJA = 60°C/W, TA = 25°C). Its current limit is specified at 3.5–5A, and thermal shutdown activates at 150°C junction temperature. Actual achievable current depends on PCB copper area, airflow, and input/output voltage differential - e.g., 3A is sustainable at 3.3VIN/1.8VOUT with proper thermal pad soldering. The MIC4722YML-TR datasheet confirms this rating across the full –40°C to +125°C operating range.
Does the MIC4722YML-TR require an external freewheeling diode?
Yes, the MIC4722YML-TR is a non-synchronous buck regulator and requires an external Schottky diode connected from SW to PGND. This is explicitly stated in the "Application Information" section and functional diagram. The diode must handle the full output current average (≥3A) and withstand the maximum input voltage (≤6V absolute max); a 40V/5A Schottky (e.g., RB055LAM-40) is commonly used. The MIC4722YML-TR does not integrate a synchronous rectifier.
What is the purpose of the BIAS pin on the MIC4722YML-TR?
The BIAS pin on the MIC4722YML-TR supplies clean power to the internal reference and control circuitry, independent of the noisy high-current VIN path. It must be decoupled with a 0.1µF ceramic capacitor to SGND and fed through a 10Ω resistor from VIN to suppress switching noise. Omitting this filter degrades regulation accuracy and can cause instability. The MIC4722YML-TR datasheet specifies this configuration in both Pin Description and Application Information sections.
Can the MIC4722YML-TR operate with 100% duty cycle, and what does that enable?
Yes, the MIC4722YML-TR supports 100% duty cycle operation when the FB pin voltage ≤ 0.4V, allowing the high-side MOSFET to remain continuously on. This enables low-dropout behavior - e.g., regulating 3.0V output from a 3.3V input during rail sag - without dropout or regulation loss. This feature is confirmed in the Electrical Characteristics table (Maximum Duty Cycle = 100%) and General Description of the MIC4722YML-TR datasheet.
How is output voltage set on the MIC4722YML-TR, and what is the feedback reference voltage?
The MIC4722YML-TR uses resistor divider feedback to set output voltage, with a precise 1.00V (±1% at 25°C, ±2% over temperature) internal reference at the FB pin. Output voltage is calculated as VOUT = 1.0V × (1 + R1/R2), where R1 connects VOUT to FB and R2 connects FB to SGND. The MIC4722YML-TR datasheet recommends R1 = 10kΩ for optimal noise immunity and provides standard resistor values for common outputs (1.2V, 1.5V, 1.8V, etc.) on page 19.
MIC4722YML-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 12-VFDFN Exposed Pad, 12-MLF®
- 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):
- 1V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 3A
- Frequency - Switching:
- 2.7MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-MLF™ (4x4)
MIC4722YML-TR FAQ
1.How can I place an order for MIC4722YML-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC4722YML-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 MIC4722YML-TR reliable?
The price and inventory of MIC4722YML-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC4722YML-TR is usually 5 days.
3.What payment methods are accepted for MIC4722YML-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC4722YML-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC4722YML-TR?
MIC4722YML-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC4722YML-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 MIC4722YML-TR?
For technical support, including MIC4722YML-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC4722YML-TR requirements.
6.How does Aetrix verify that MIC4722YML-TR is sourced from the original manufacturer or authorized distributors?
All MIC4722YML-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 MIC4722YML-TR meets industry standards.
7.What is the process for return or replacement of MIC4722YML-TR?
All MIC4722YML-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC4722YML-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 MIC4722YML-TR part is unused and in its original packaging.
Return procedure for MIC4722YML-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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