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Microchip Technology MIC4744YML-TR
- Part No.:
- MIC4744YML-TR
- Manufacturer:
- Microchip Technology
- Package:
- 16-VQFN Exposed Pad, 16-MLF®
- Datasheet:
-
MIC4744YML-TR.pdf
- Description:
- IC REG BUCK ADJ 2A DL 16MLF
- Quantity:
- Payment:
- Shipping:
Inventory:3,217
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Product details
Overview
MIC4744YML-TR from Micrel is a dual-channel, 4 MHz synchronous-capable (non-synchronous design with external Schottky diode) buck regulator delivering two independent 2A DC outputs. It operates from 2.9V to 5.5V input, supports adjustable output down to 0.6V per channel, achieves >90% efficiency via integrated P-Channel MOSFETs (155 mΩ typical RDS(on)), and targets point-of-load regulation in FPGA/ASIC power domains.
For engineers reviewing the MIC4744YML-TR datasheet, MIC4744YML-TR pinout, MIC4744YML-TR application, or MIC4744YML-TR equivalent, key selection criteria include its 4 MHz switching frequency enabling ultra-small 0.47 µH inductors and 10 µF output capacitors, 100% duty cycle capability for low-dropout operation, dual independent enable (EN1/EN2) and feedback (FB1/FB2) control, and thermal shutdown with –40°C to +125°C junction range.
Technical Context
The MIC4744YML-TR implements a fixed-frequency voltage-mode PWM architecture with proprietary internal Type III compensation, delivering closed-loop bandwidth exceeding 200 kHz. Its dual-output structure features independent high-side P-Channel MOSFET switches (SW1/SW2), each with dedicated VIN, PGND, EN, and FB pins - enabling asynchronous operation and phase separation of up to 180°.
It requires external Schottky freewheeling diodes and supports discontinuous conduction mode (DCM) at light loads for improved efficiency. The BIAS pin supplies internal reference and control circuitry via a 10 Ω resistor from VIN and a 0.1 µF bypass capacitor to SGND, while SGND and PGND are kept separate to minimize noise coupling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 4 MHz ±10% - enables use of 0.47 µH inductors and reduces output ripple without increasing filter size. |
| Output Current per Channel | 2 A continuous - supports dual-core SoC or FPGA I/O and core rail requirements simultaneously. |
| Input Voltage Range | 2.9 V to 5.5 V - compatible with single-cell Li-ion, 3.3 V, and 5 V system rails. |
| Feedback Reference Voltage | 0.6 V ±2% - sets minimum output voltage and defines resistor-divider ratio for precise output programming. |
| Max Duty Cycle | 100% - allows operation with VOUT ≈ VIN, critical for low-dropout scenarios like post-regulation of 3.3 V to 3.0 V. |
| Internal High-Side RDS(on) | 155 mΩ typical - contributes to >90% peak efficiency and reduces thermal load vs. discrete switch solutions. |
| Junction Temperature Range | –40°C to +125°C - qualified for automotive infotainment and industrial embedded applications. |
Pinout & Package
The MIC4744YML-TR is housed in a thermally enhanced 16-pin 3 mm × 3 mm MLF® package with exposed pad (EPAD) for improved heat dissipation. Pin numbering follows standard MLF convention with top-marked dot orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 12 | FB2 / FB1 | Feedback input for Output 2 / Output 1 - connects to resistor divider to set regulated output voltage (VREF = 0.6 V). |
| 2, 11 | EN2 / EN1 | Enable input for Output 2 / Output 1 - logic-low disables respective channel, reducing quiescent current to <10 µA. |
| 3–4, 9–10 | SW2 / SW1 | Switch node for Output 2 / Output 1 - connects to inductor and external Schottky diode cathode; high dv/dt node requiring careful layout. |
| 5, 8 | PGND2 / PGND1 | Power ground return for Output 2 / Output 1 - carries high-switching-current paths; must be routed separately from SGND. |
| 6–7, 14–15 | VIN2 / VIN1 | Input supply for Output 2 / Output 1 - powers internal P-MOSFET source and driver; requires local 10 µF ceramic bypass to PGND. |
| 13 | SGND | Signal ground - reference for FB, EN, and internal control circuitry; must be isolated from PGND loops. |
| 16 | BIAS | Bias supply input - powered via 10 Ω resistor from VIN; requires 0.1 µF ceramic capacitor to SGND for clean reference generation. |
| EPAD | GND | Exposed thermal pad - must be soldered to PCB ground plane for thermal performance and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent PWM channels | Enables separate sequencing, enable control, and output adjustment for multi-rail systems (e.g., FPGA core + I/O). |
| 4 MHz fixed-frequency operation | Reduces required inductor size by ~16× vs. 500 kHz designs, minimizing board area and cost in space-constrained applications. |
| Integrated 2A P-Channel MOSFETs | Eliminates need for external high-side switches and current-sense resistors, simplifying BOM and improving reliability. |
| 100% duty cycle capability | Supports dropout voltages as low as 100 mV, allowing regulation under marginal input conditions without dropout. |
| Ultra-fast transient response | 200+ kHz closed-loop bandwidth ensures <100 mV output deviation during 1 A/µs load steps typical in digital logic rails. |
| Thermal shutdown & current limit | Protects against overloads and PCB overheating; auto-recovery after fault removal ensures robust field operation. |
Applications
| FPGA Core & I/O Power | Automotive Satellite Radio |
|---|---|
|
Use Scenario: Powering Xilinx Artix-7 FPGA with 1.0 V core and 1.8 V I/O rails from a 3.3 V intermediate bus. IC Role / Device Role / Timing Role: Dual-output buck regulator providing independently regulated, low-noise DC supplies synchronized to logic timing margins. Use Value: Eliminates need for two discrete regulators; 4 MHz switching avoids interference with RF front-end frequencies while maintaining tight load regulation (<0.2%). |
Use Scenario: Generating 3.3 V and 5.0 V rails for digital signal processor and tuner modules in vehicle-mounted satellite radio units. IC Role / Device Role / Timing Role: Dual POL regulator operating across automotive temperature range with independent enable for sleep/wake sequencing. Use Value: 125°C junction rating and thermal shutdown ensure reliability in sealed enclosures; 100% duty cycle maintains 3.3 V output during cold-crank battery dips to 2.9 V. |
| HD Set-Top Box SoC | Computer Peripheral (GPU VRM) |
|
Use Scenario: Supplying 1.2 V CPU core and 1.5 V memory interface for Broadcom BCM7445 SoC in 4K HD STB platforms. IC Role / Device Role / Timing Role: High-efficiency dual buck converter delivering fast transient response to handle bursty video decode workloads. Use Value: >90% efficiency at 1.5 A load reduces thermal load on compact STB PCB; 200 kHz bandwidth limits output voltage droop to <60 mV during 2 A step transients. |
Use Scenario: Providing 1.05 V GPU core and 1.8 V memory rail for discrete graphics cards in desktop PCs with limited VRM real estate. IC Role / Device Role / Timing Role: Compact dual buck controller supporting high-density layout with minimal external components (0.47 µH + 10 µF per channel). Use Value: 3 mm × 3 mm MLF package saves >40% board area vs. dual TSSOP solutions; exposed pad lowers θJA to 60°C/W for passive cooling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54290RGER | 2.2 MHz, dual 3A, integrated N-MOSFETs, requires external bootstrap capacitor; no 100% duty cycle. | Higher current per channel but lower switching frequency increases inductor size; better suited for higher-power SoCs. | Select when >2A per rail or tighter output accuracy (±1%) is required; avoid if 100% duty cycle or 4 MHz EMI profile is mandatory. |
| RT8205AZSP | 1.5 MHz, dual 2A, integrated N-MOSFETs, synchronous rectification, 0.6 V reference, –40°C to +85°C only. | Synchronous design eliminates Schottky diode but lacks extended temperature rating and 4 MHz speed. | Prefer for cost-sensitive consumer applications where thermal margin is sufficient and 125°C operation is unnecessary. |
Compared with TPS54290RGER and RT8205AZSP, the MIC4744YML-TR uniquely combines 4 MHz operation, 100% duty cycle, and –40°C to +125°C qualification - making it optimal for compact, thermally demanding, low-dropout dual-rail systems where EMI headroom and cold-crank resilience are critical.
Availability
MIC4744YML-TR is available at Aetrix Electronics and suitable for FPGA/ASIC power delivery, automotive infotainment subsystems, and HD set-top box SoC regulation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MIC4744YML-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 industrial and communications markets.
The MIC4744YML-TR belongs to Micrel's high-frequency dual buck regulator product line, designed specifically for space-constrained, multi-rail point-of-load applications in broadband, automotive, and computing infrastructure where efficiency, thermal performance, and small solution size are prioritized.
FAQ
What is the recommended input capacitor configuration for MIC4744YML-TR?
Each VIN pin (VIN1 and VIN2) requires a 10 µF X5R/X7R ceramic capacitor placed as close as possible to the pin and its associated PGND. An additional 0.1 µF ceramic capacitor should be added in parallel for high-frequency filtering. Avoid Y5V, tantalum, or electrolytic types due to poor temperature stability and ESR performance. The MIC4744YML-TR's 4 MHz switching demands low-ESL/ESR capacitance to maintain stability and minimize input ripple.
Does MIC4744YML-TR support synchronous rectification?
No, the MIC4744YML-TR is a non-synchronous buck regulator and requires an external Schottky diode connected between each SW pin and PGND. Its internal P-Channel MOSFET serves only as the high-side switch; there is no integrated low-side switch or synchronous gate drive. This architecture trades some efficiency at light loads for simplicity, cost reduction, and elimination of shoot-through risk.
Can MIC4744YML-TR operate with only one output enabled?
Yes, MIC4744YML-TR supports independent channel control: EN1 enables/disables Output 1 and EN2 controls Output 2. Either channel may be disabled while the other remains active, drawing <10 µA quiescent current per disabled channel. This allows flexible power sequencing and dynamic rail shutdown in multi-voltage systems without affecting the enabled output's regulation or efficiency.
What is the purpose of the BIAS pin on MIC4744YML-TR?
The BIAS pin supplies regulated bias voltage to the MIC4744YML-TR's internal reference and control circuitry. It must be connected to VIN through a 10 Ω resistor and bypassed to SGND with a 0.1 µF ceramic capacitor. This filtering prevents high-frequency switching noise from modulating the internal reference, ensuring stable feedback loop operation and accurate output voltage regulation across load and temperature.
How does MIC4744YML-TR achieve >90% efficiency?
MIC4744YML-TR achieves >90% peak efficiency primarily through its low 155 mΩ typical RDS(on) integrated P-Channel MOSFETs, 4 MHz switching that minimizes inductor DCR losses, and optimized gate drive minimizing switching losses. Efficiency is further enhanced by eliminating the need for a current-sense resistor and using ultra-small passive components (0.47 µH inductor, 10 µF capacitor), which reduce parasitic losses. Measured data shows 94–96% at 2 A with 5 V input and 3.3 V output.
MIC4744YML-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 16-VQFN Exposed Pad, 16-MLF®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 2.9V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 2A
- Frequency - Switching:
- 4MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MLF® (4x4)
MIC4744YML-TR FAQ
1.How can I place an order for MIC4744YML-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC4744YML-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 MIC4744YML-TR reliable?
The price and inventory of MIC4744YML-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC4744YML-TR is usually 5 days.
3.What payment methods are accepted for MIC4744YML-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC4744YML-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC4744YML-TR?
MIC4744YML-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC4744YML-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 MIC4744YML-TR?
For technical support, including MIC4744YML-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC4744YML-TR requirements.
6.How does Aetrix verify that MIC4744YML-TR is sourced from the original manufacturer or authorized distributors?
All MIC4744YML-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 MIC4744YML-TR meets industry standards.
7.What is the process for return or replacement of MIC4744YML-TR?
All MIC4744YML-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC4744YML-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 MIC4744YML-TR part is unused and in its original packaging.
Return procedure for MIC4744YML-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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