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Microchip Technology MIC4742YML-TR
- Part No.:
- MIC4742YML-TR
- Manufacturer:
- Microchip Technology
- Package:
- 16-VQFN Exposed Pad, 16-MLF®
- Datasheet:
-
MIC4742YML-TR.pdf
- Description:
- IC REG BUCK ADJ 2A DL 16MLF
- Quantity:
- Payment:
- Shipping:
Inventory:1,737
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Product details
Overview
MIC4742YML-TR from Micrel is a dual-channel, 2 MHz synchronous-capable (non-synchronous design with external Schottky diode) buck regulator IC 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 >92% peak efficiency, and features 100% duty cycle capability for low-dropout operation - used in FPGA/ASIC point-of-load power delivery and HD STB power rails.
For engineers reviewing the MIC4742YML-TR datasheet, MIC4742YML-TR pinout, MIC4742YML-TR application, or MIC4742YML-TR equivalent, key selection criteria include its 2 MHz switching frequency, dual 2A output capability, internal P-channel MOSFETs with 155 mΩ typical RDS(on), –40°C to +125°C junction range, and MLF® 3 mm × 3 mm 16-pin exposed-pad package.
Technical Context
The MIC4742YML-TR integrates two independent PWM buck controllers with proprietary internal Type III voltage-mode compensation, enabling closed-loop bandwidth exceeding 200 kHz. Each channel uses an internal high-side P-channel MOSFET switch and requires an external Schottky freewheeling diode.
It supports ultra-fast transient response via feed-forward capacitor support and stable operation with only 1 µH inductors and 4.7 µF ceramic output capacitors. The device implements thermal shutdown (153°C), current limiting (~2.5–4.3 A), and micro-power shutdown (<10 µA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.9 V to 5.5 V - supports single-supply operation from common 3.3 V or 5 V rails without LDO pre-regulation. |
| Switching Frequency | 2 MHz (typical), 1.5–2.3 MHz (min–max) - enables compact filter design with 1 µH inductors and minimal PCB area. |
| Output Current per Channel | 2 A continuous - sufficient for powering core logic of FPGAs, ASICs, and digital signal processors. |
| Feedback Reference Voltage | 0.6 V ±2% over temperature - sets precise output voltage via external resistor divider; enables 0.6 V to 5.5 V adjustable range. |
| 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 rails. |
| RDS(on) (High-Side P-MOSFET) | 155 mΩ (typical at ISW = 50 mA) - reduces conduction loss and improves efficiency, especially at higher input voltages. |
| Junction Temperature Range | –40°C to +125°C - qualified for automotive infotainment, industrial control, and broadband equipment operating in harsh environments. |
Pinout & Package
Package: Exposed-pad 16-pin MLF® (MicroLeadFrame), 3 mm × 3 mm, RoHS-compliant, NiPdAu lead finish. Thermal pad (EPAD) must be soldered to PCB ground plane for optimal thermal performance (θJA = 60°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB1, FB2 | Feedback Input (x2) | Connects to resistor divider to set output voltage; 0.6 V reference enables precision regulation down to 0.6 V per channel. |
| EN1, EN2 | Enable Input (x2) | Logic-level control (0.5–1.3 V threshold); pulling low disables respective channel and reduces quiescent current to <10 µA. |
| VIN1, VIN2 (x2 each) | Power Input (x4) | Supplies internal P-MOSFET sources and drivers; internally connected via anti-parallel diodes; requires local 10 µF + 0.1 µF bypassing. |
| SW1, SW2 | Switch Node Output (x2) | Drives external inductor; connects to cathode of freewheeling Schottky diode; high dv/dt node requiring careful layout. |
| PGND1, PGND2 | Power Ground (x2) | Provides return path for high-side MOSFET drive current; internally linked by anti-parallel diodes; must be routed as low-inductance loop. |
| SGND | Signal Ground | Reference for error amplifier, bias circuitry, and feedback network; must be isolated from PGND to avoid noise coupling. |
| BIAS | Bias Supply | Internally powered via 10 Ω resistor from VIN; requires 0.1 µF ceramic cap to SGND for clean reference and control stability. |
| EPAD | Thermal Pad | Exposed copper pad on underside; must be soldered to solid GND plane for thermal dissipation and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 2A integrated buck channels | Reduces BOM count and board space vs. two discrete regulators; eliminates need for external current-sense resistors. |
| 2 MHz fixed-frequency PWM | Enables use of miniature 1 µH shielded inductors and 4.7 µF X5R/X7R ceramic capacitors - no electrolytics required. |
| Internal P-channel MOSFETs (155 mΩ) | Improves light- and full-load efficiency (>92% typical); gate drive sourced internally - no bootstrap capacitor needed. |
| 100% duty cycle capability | Supports low-dropout operation (e.g., 3.3 V → 3.0 V), extending usable input range and simplifying supply sequencing. |
| Ultra-fast transient response | Stable with feed-forward capacitor; achieves >200 kHz closed-loop bandwidth for sub-100 ns load-step recovery in FPGA cores. |
| Robust protection suite | Includes thermal shutdown (153°C), cycle-by-cycle current limit, and UVLO (2.6 V turn-on with 100 mV hysteresis) - ensures safe operation under fault conditions. |
Applications
| FPGA Core Power | HD Set-Top Box SoC Rails |
|---|---|
|
Use Scenario: Delivering tightly regulated 1.2 V and 1.8 V supplies to Xilinx or Intel FPGA core and I/O banks during dynamic reconfiguration. IC Role / Device Role / Timing Role: Dual-output point-of-load regulator providing independent, fast-transient power domains synchronized to logic clock domains. Use Value: 2 MHz switching minimizes output ripple and enables small 1 µH inductors; 0.6 V reference ensures accurate low-voltage rail generation critical for 28 nm/16 nm process nodes. |
Use Scenario: Powering main SoC (e.g., Broadcom BCM7xxx), video decoder, and HDMI PHY in high-definition satellite/cable STBs. IC Role / Device Role / Timing Role: Primary DC-DC converter generating 1.0 V, 1.2 V, and 3.3 V rails from a 5 V intermediate bus. Use Value: >92% efficiency reduces thermal load in sealed enclosures; –40°C to +125°C rating ensures reliability across ambient temperature swings in living-room deployments. |
| Automotive Satellite Radio | Computer Peripheral Power |
|
Use Scenario: Regulating 3.3 V and 5.0 V rails for digital audio processing, RF tuner, and CAN interface in vehicle-installed satellite radio modules. IC Role / Device Role / Timing Role: Dual-channel buck regulator meeting AEC-Q100 stress test requirements when mounted on automotive-grade PCBs. Use Value: 100% duty cycle supports cold-crank operation (input dip to 2.9 V); thermal shutdown protects against under-dash heat buildup. |
Use Scenario: Providing dedicated 1.8 V and 3.3 V supplies for GPU memory interfaces and PCIe controller logic in high-end graphics cards or multifunction printers. IC Role / Device Role / Timing Role: High-current, low-noise POL regulator placed adjacent to ASICs to minimize IR drop and EMI. Use Value: MLF® 3 mm × 3 mm package fits tight spaces near GPU dies; exposed thermal pad enables direct heatsinking to metal chassis. |
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 |
|---|---|---|---|
| MP2491DS-LF-Z | 2.2 MHz, dual 2A, integrated high-/low-side MOSFETs (synchronous), 2.5–5.5 V input, 0.6 V ref, but no 100% duty cycle. | Higher efficiency at light loads due to synchronous rectification; unsuitable for ultra-low dropout where VOUT ≥ VIN − 0.1 V. | Select MP2491DS-LF-Z when efficiency >94% across full load range is prioritized and dropout margin allows synchronous operation. |
| TPS54290PWPR | 2.2 MHz, dual 2A, external MOSFETs required, 4.5–20 V input, 0.8 V ref, adjustable frequency, no integrated high-side switch. | Wider input range supports 12 V intermediate bus; higher complexity and BOM cost due to external FETs and drivers. | Select TPS54290PWPR when input exceeds 5.5 V or when design requires programmable frequency and external FET optimization. |
Compared with MP2491DS-LF-Z and TPS54290PWPR, the MIC4742YML-TR uniquely combines non-synchronous simplicity, 100% duty cycle, and MLF® thermal performance in a 3 mm × 3 mm footprint - making it optimal for space-constrained, low-input-voltage, dropout-sensitive dual-rail systems.
Availability
MIC4742YML-TR is available at Aetrix Electronics and suitable for FPGA/ASIC power delivery, HD STB SoC rails, and automotive satellite radio designs requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MIC4742YML-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 MIC4742YML-TR belongs to Micrel's high-frequency dual buck regulator product line, designed specifically for compact, high-efficiency point-of-load conversion in broadband, consumer, and automotive electronics where thermal density and layout simplicity are critical.
FAQ
What is the recommended input capacitor configuration for the MIC4742YML-TR?
Each VIN pin (VIN1 and VIN2) requires a 10 µF X5R/X7R ceramic capacitor placed close to the pin and its associated PGND connection, plus an additional 0.1 µF ceramic capacitor for high-frequency filtering. Avoid Y5V, tantalum, or electrolytic capacitors due to poor temperature stability and RMS current handling. The MIC4742YML-TR relies on this low-ESR/ESL network to suppress switching noise and maintain stability under transient load steps.
Does the MIC4742YML-TR support synchronous rectification?
No, the MIC4742YML-TR is a non-synchronous buck regulator and requires an external Schottky freewheeling diode connected between each SW pin and PGND. Its internal high-side P-channel MOSFET does not integrate a synchronous low-side switch. This architecture trades some light-load efficiency for simplicity, cost reduction, and elimination of shoot-through risk - a deliberate design choice reflected in the MIC4742YML-TR's datasheet and application circuits.
Can the MIC4742YML-TR operate with only one channel enabled?
Yes, the MIC4742YML-TR supports independent channel control: EN1 and EN2 are separate logic inputs. Driving EN1 low disables Channel 1 while Channel 2 remains fully operational (and vice versa), with total quiescent current dropping below 10 µA when both are disabled. This enables dynamic power gating in multi-rail systems - a confirmed function documented in the Pin Description and Electrical Characteristics tables of the MIC4742YML-TR datasheet.
What is the purpose of the BIAS pin on the MIC4742YML-TR?
The BIAS pin supplies clean internal bias voltage to the MIC4742YML-TR's reference and control circuitry. It must be connected via a 10 Ω resistor to VIN and bypassed with a 0.1 µF ceramic capacitor to SGND. This RC filter isolates high-frequency switching noise from the sensitive analog sections, preventing instability and ensuring accurate feedback regulation - a requirement explicitly stated in the MIC4742YML-TR's Application Information section.
Is the MIC4742YML-TR pin-compatible with other Micrel dual buck regulators?
No, the MIC4742YML-TR has a unique 16-pin MLF® pinout optimized for dual-channel routing and thermal dissipation; it is not pin-compatible with Micrel's MIC28514 or MIC24045 families. Pin assignments for FB, EN, SW, PGND, and BIAS differ across generations. Layout reuse is not possible without verification - the MIC4742YML-TR's Pin Configuration diagram and Pin Description table confirm this distinct mapping.
MIC4742YML-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:
- 2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MLF® (4x4)
MIC4742YML-TR FAQ
1.How can I place an order for MIC4742YML-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC4742YML-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 MIC4742YML-TR reliable?
The price and inventory of MIC4742YML-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC4742YML-TR is usually 5 days.
3.What payment methods are accepted for MIC4742YML-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC4742YML-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC4742YML-TR?
MIC4742YML-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC4742YML-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 MIC4742YML-TR?
For technical support, including MIC4742YML-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC4742YML-TR requirements.
6.How does Aetrix verify that MIC4742YML-TR is sourced from the original manufacturer or authorized distributors?
All MIC4742YML-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 MIC4742YML-TR meets industry standards.
7.What is the process for return or replacement of MIC4742YML-TR?
All MIC4742YML-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC4742YML-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 MIC4742YML-TR part is unused and in its original packaging.
Return procedure for MIC4742YML-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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