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Microchip Technology MIC4721YMM-TR
- Part No.:
- MIC4721YMM-TR
- Manufacturer:
- Microchip Technology
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MIC4721YMM-TR.pdf
- Description:
- IC REG BUCK ADJ 1.5A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,487
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Product details
Overview
MIC4721YMM-TR from Micrel Inc. is a 1.5A, 2MHz PWM synchronous-capable (non-synchronous) buck regulator with integrated p-channel MOSFET, adjustable output down to 1V, and 100% duty cycle capability for low-dropout operation. It delivers up to 94% efficiency at 3.3VIN→1.8VOUT/1.5A and operates across –40°C to +125°C in a Pb-free 10-pin MSOP package - used in FPGA core voltage regulation and point-of-load DC/DC conversion.
For engineers reviewing the MIC4721YMM-TR datasheet, MIC4721YMM-TR pinout, MIC4721YMM-TR application, or MIC4721YMM-TR equivalent, key selection criteria include input voltage range (2.7–5.5V), feedback reference voltage (1.0V ±2%), switching frequency stability (1.8–2.2MHz), thermal shutdown threshold (160°C), and PGOOD accuracy (±7.5% regulation window).
Technical Context
The MIC4721YMM-TR implements voltage-mode PWM control with proprietary internal type III compensation, enabling closed-loop bandwidth >200kHz and stable operation with only a 1µH inductor and 4.7µF ceramic output capacitor. Its internal p-channel high-side switch features 95–300mΩ on-resistance depending on VIN and temperature.
It supports ultra-fast transient response via feedforward capacitor integration and includes micropower shutdown (<10µA), power-good monitoring, and protection against overtemperature (160°C) and overcurrent (3.5–5A current limit). The device operates in continuous or discontinuous conduction mode, with pulse-skipping at light loads to improve efficiency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1.5A maximum continuous output - sufficient for FPGA I/O banks or DSP core rails. |
| Switching Frequency | 2MHz ±10% - enables compact magnetics and reduces EMI fundamental frequency. |
| Input Voltage Range | 2.7V to 5.5V - compatible with single-cell Li-ion, 3.3V, and 5V system rails. |
| Feedback Reference | 1.0V ±2% over temperature - sets output voltage via external resistor divider (e.g., 10kΩ R1 + 10kΩ R2 = 2.0VOUT). |
| Efficiency | Up to 94% at 3.3VIN→1.8VOUT/1.5A - minimizes thermal load in space-constrained embedded systems. |
| Duty Cycle Max | 100% - maintains regulation when VIN approaches VOUT, critical for battery-powered brownout resilience. |
| Thermal Shutdown | 160°C with 20°C hysteresis - prevents permanent damage during sustained overload or poor heatsinking. |
Pinout & Package
Packaged in a Pb-free 10-pin MSOP (MM) with 0.5mm pitch, the MIC4721YMM-TR uses dual VIN and SW pins for low-inductance high-current routing, separate SGND and PGND planes for noise isolation, and dedicated BIAS supply filtering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 10 | SW | Switch node - connects directly to inductor; carries high di/dt switching current; requires minimized trace area and separation from sensitive nodes. |
| 2, 9 | VIN | Power input - supplies source of internal p-MOSFET; each pin requires local 10µF X5R/X7R ceramic bypass to PGND. |
| 3 | SGND | Signal ground - return path for error amplifier, reference, and control logic; must be isolated from PGND except at single-point star connection. |
| 4 | BIAS | Bias supply - powers internal reference and control circuitry; requires 10Ω series resistor from VIN and 0.1µF ceramic to SGND. |
| 5 | FB | Feedback input - senses divided output voltage; 1.0V reference enables precise VOUT adjustment; parasitic capacitance limits high-frequency stability without CFF. |
| 6 | EN | Enable input - logic-high (>0.85V) enables regulation; logic-low (<0.5V) shuts down IC, reducing VIN current to <10µA. |
| 7 | PGOOD | Open-drain power-good - pulled low when VOUT is within ±7.5% of setpoint; requires external pull-up for system sequencing or fault indication. |
| 8 | PGND | Power ground - return path for MOSFET drive and inductor current; must form tight loop with VIN and SW to minimize EMI and voltage spikes. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated p-MOSFET switch | Eliminates external high-side FET and current-sense resistor - reduces BOM count and layout complexity. |
| 2MHz fixed-frequency PWM | Enables use of sub-2mm height, low-DCR 1µH shielded inductors - ideal for ultra-thin computing peripherals and video cards. |
| 100% duty cycle operation | Supports dropout as low as VOUT − 100mV at light load - extends runtime in battery-powered DVD recorders and set-top boxes. |
| Power Good (PGOOD) pin | Provides system-level voltage monitoring with ±7.5% accuracy - enables safe processor reset or rail sequencing in FPGA/DSP applications. |
| Ultra-fast transient response | Stable with 1µH/4.7µF output filter and feedforward capacitor - achieves <100µs recovery from 1A load step with <50mV undershoot. |
Applications
| FPGA Core Power | DSP Point-of-Load |
|---|---|
Use Scenario: Supplying 1.2V/1.5A to Xilinx Spartan-6 FPGA core logic under dynamic switching loads. IC Role / Device Role / Timing Role: Primary buck regulator delivering tightly regulated core voltage with fast transient response to logic state changes. Use Value: Maintains <±1.5% output regulation during 1A load steps, preventing configuration errors or timing violations in high-speed logic. | Use Scenario: Generating 1.8V/1.2A for TI C674x DSP memory interface in broadband baseband processing. IC Role / Device Role / Timing Role: Dedicated PoL converter ensuring clean, low-noise supply for DDR2/3 I/O and SerDes PHY blocks. Use Value: 94% peak efficiency and 2MHz switching reduce thermal footprint and enable placement near signal-sensitive analog sections. |
| Video Card GPU Rail | Set-Top Box SoC Core |
Use Scenario: Providing 1.0V/1.5A to NVIDIA GT218 GPU shader cores in embedded graphics modules. IC Role / Device Role / Timing Role: High-efficiency buck stage supporting burst-mode GPU workloads with minimal voltage droop. Use Value: 100% duty cycle capability sustains regulation during 5V-to-1V conversion as input drops under heavy GPU load. | Use Scenario: Regulating 1.2V/1.0A for Broadcom BCM7445 SoC application processor in cable/satellite STBs. IC Role / Device Role / Timing Role: Main core supply with PGOOD signaling to enable secure boot and watchdog timeout coordination. Use Value: ±7.5% PGOOD window ensures reliable detection of undervoltage faults before firmware execution begins. |
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 | 2A rated, 340kHz–2.2MHz adjustable frequency, external compensation, no PGOOD pin. | Lacks integrated PGOOD and fixed 2MHz timing - requires additional fault monitoring circuitry. | Preferred when higher output current or programmable frequency is required, but adds design overhead for sequencing. |
| TPS561201DDFR | 1.5A, 600kHz, integrated MOSFETs (synchronous), 0.8V reference, PGOOD, smaller SOT-23-6 package. | Lower quiescent current (95µA vs. 900µA), synchronous rectification improves light-load efficiency. | Best for space-constrained, battery-backed applications where 600kHz switching and sync rectification outweigh need for 2MHz speed. |
Compared with MP2307DN-LF-Z and TPS561201DDFR, the MIC4721YMM-TR uniquely balances 2MHz operation, 100% duty cycle, and PGOOD in a 10-pin MSOP - making it optimal for thermally dense, high-transient FPGA/DSP designs where timing headroom and brownout resilience are critical.
Availability
MIC4721YMM-TR is available at Aetrix Electronics and suitable for FPGA/DSP/ASIC power delivery, broadband communications infrastructure, and video card GPU rail applications requiring stable component supply across industrial temperature ranges.
Supply support for MIC4721YMM-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 high-performance power management, timing, and interface solutions.
The MIC4721YMM-TR belongs to Micrel's high-frequency buck regulator product line, designed specifically for compact, high-efficiency point-of-load conversion in computing, communications, and consumer electronics where thermal density and transient response are critical.
FAQ
What is the minimum output voltage supported by the MIC4721YMM-TR?
The MIC4721YMM-TR supports an adjustable output voltage down to 1.0V, set by the external resistor divider connected to the FB pin. Its internal 1.0V ±2% feedback reference enables precise regulation across temperature and load, and the 100% duty cycle capability ensures stable operation even when input voltage approaches the output level - a key requirement for low-VDD FPGA and ASIC core rails.
Does the MIC4721YMM-TR require an external freewheeling diode?
Yes, the MIC4721YMM-TR is a non-synchronous buck regulator and requires an external Schottky diode connected between SW and PGND. A low-forward-voltage, fast-recovery Schottky diode rated for ≥1.5A average current and ≥5.5V reverse voltage is recommended to minimize conduction losses and maintain high efficiency - especially at low duty cycles where diode losses dominate.
What is the purpose of the BIAS pin on the MIC4721YMM-TR?
The BIAS pin on the MIC4721YMM-TR supplies internal bias current to the reference and control circuitry. It must be decoupled with a 0.1µF ceramic capacitor to SGND and fed through a 10Ω resistor from VIN. This filtering isolates high-frequency switching noise from the sensitive analog sections, ensuring stable reference voltage and accurate feedback regulation - critical for maintaining ±2% output accuracy over temperature.
Can the MIC4721YMM-TR operate with a 1µH inductor and 4.7µF output capacitor?
Yes, the MIC4721YMM-TR is explicitly characterized and optimized for use with a 1µH inductor and 4.7µF ceramic output capacitor. Its internal type III compensation and 2MHz switching frequency ensure stability and fast transient response with this minimal external component set - eliminating the need for complex external compensation networks and reducing solution size in space-constrained applications like video cards and set-top boxes.
How does the PGOOD pin function on the MIC4721YMM-TR?
The PGOOD pin on the MIC4721YMM-TR is an open-drain output that pulls low when the regulated output voltage is within ±7.5% of the target value. It requires an external pull-up resistor to a valid logic voltage (e.g., 3.3V). This signal is used for system power sequencing, fault detection, and safe startup/shutdown coordination - for example, enabling a downstream FPGA only after MIC4721YMM-TR confirms stable 1.2V core rail delivery.
MIC4721YMM-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm 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):
- 1V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
MIC4721YMM-TR FAQ
1.How can I place an order for MIC4721YMM-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC4721YMM-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 MIC4721YMM-TR reliable?
The price and inventory of MIC4721YMM-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC4721YMM-TR is usually 5 days.
3.What payment methods are accepted for MIC4721YMM-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC4721YMM-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC4721YMM-TR?
MIC4721YMM-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC4721YMM-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 MIC4721YMM-TR?
For technical support, including MIC4721YMM-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC4721YMM-TR requirements.
6.How does Aetrix verify that MIC4721YMM-TR is sourced from the original manufacturer or authorized distributors?
All MIC4721YMM-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 MIC4721YMM-TR meets industry standards.
7.What is the process for return or replacement of MIC4721YMM-TR?
All MIC4721YMM-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC4721YMM-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 MIC4721YMM-TR part is unused and in its original packaging.
Return procedure for MIC4721YMM-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MIC4721YMM-TR Tags
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