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Microchip Technology MIC28510YJL-TR
- Part No.:
- MIC28510YJL-TR
- Manufacturer:
- Microchip Technology
- Package:
- 28-PowerVQFN
- Datasheet:
-
MIC28510YJL-TR.pdf
- Description:
- IC REG BUCK ADJ 4A 28QFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MIC28510YJL-TR from Micrel is a synchronous step-down DC/DC buck regulator with adaptive on-time control architecture, operating from 4.5V to 75V input and delivering up to 4A output current with ±1% feedback reference accuracy at 0.8V. It features Hyper Speed Control™ for ultra-fast transient response, supports output voltages adjustable from 0.8V to 24V, and integrates dual N-channel MOSFETs (31 mΩ top/bottom RDS(ON)) in a thermally enhanced 28-pin 5mm × 6mm MLF® package-used in industrial power supplies and solar energy converters.
For engineers reviewing the MIC28510YJL-TR datasheet, MIC28510YJL-TR pinout, MIC28510YJL-TR application, or MIC28510YJL-TR equivalent, key selection criteria include its 75V max input rating, 4A continuous output capability, 100–500kHz adjustable switching frequency, internal compensation, and support for pre-biased startup-critical for high-voltage distributed power systems requiring stable regulation under wide VIN/VOUT ratios.
Technical Context
The MIC28510YJL-TR implements a digitally-modified adaptive on-time control scheme that estimates tON based on VOUT/VIN × 1/fSW, enabling near-fixed-frequency operation while retaining fast load-transient response. Its control loop uses feedback voltage ripple (20–100mV recommended) instead of direct current sensing to trigger on-time periods.
Protection logic includes foldback current limiting tied to FB voltage (e.g., ~7A limit at VFB = 0.8V), hiccup-mode short-circuit response, thermal shutdown at 160°C with 2°C hysteresis, and undervoltage lockout on VDD (3.2–4.45V trip with 380mV hysteresis). Internal soft-start ramps the 0.8V reference over ~6ms to limit inrush.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 75V - enables single-stage conversion from 48V telecom or 72V solar arrays without pre-regulation. |
| Output Current | Up to 4A continuous - supports mid-power FPGA, DSP, or ASIC core rails in industrial equipment. |
| Feedback Accuracy | ±1% at 0°C–85°C - ensures tight output regulation across temperature for precision analog subsystems. |
| Switching Frequency | 100kHz to 500kHz adjustable via external resistor divider - balances EMI, efficiency, and inductor size for system-level optimization. |
| Internal MOSFET RDS(ON) | 31 mΩ high-side and 31 mΩ low-side - reduces conduction loss and eliminates need for external sense resistors. |
| Junction Temp Range | −40°C to +125°C - qualified for under-hood automotive auxiliary supplies and outdoor solar inverters. |
| Package | 28-pin 5mm × 6mm MLF® - exposes thermal pad for PCB heatsinking; θJA = 36°C/W enables 4A operation with minimal copper area. |
Pinout & Package
Package: 28-pin 5mm × 6mm MLF® (MicroLeadFrame®) with exposed thermal pad; Pb-free finish; rated for −40°C to +125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3 | NC | No-connect pins - must remain unconnected per layout guidelines to avoid parasitic coupling. |
| 2, 5–8, 21 | PGND | Power ground return for internal MOSFET sources and input/output capacitors - requires dedicated low-inductance polygon pour separate from SGND. |
| 4, 9–12 | SW | Switch node connecting high-side drain and low-side source - high dv/dt node; must be minimized in length and area to reduce EMI. |
| 13–19 | PVIN | Main input power rail (4.5–75V); connects to high-side MOSFET drain - requires local ceramic input capacitance directly to PGND. |
| 20 | BST | Bootstrap supply for high-side gate driver - requires 0.1µF capacitor to SW and Schottky diode from VDD to maintain gate drive during high-duty cycles. |
| 22 | CS | Current sense input monitoring low-side MOSFET VDS during OFF-time - routed away from noise-sensitive nodes to avoid false overcurrent triggering. |
| 23 | FS | Frequency setting pin - configures switching frequency via resistor divider (R18/R19); open = ~450kHz nominal. |
| 24 | EN | CMOS-compatible enable input (logic high = active); internal 100kΩ pull-up to VDD - allows sequencing control and low-quiescent shutdown (0.7mA). |
| 25 | FB | Feedback input regulated to 0.8V reference - sets output voltage via resistor divider; bias current < ±0.5µA minimizes divider error. |
| 26 | SGND | Signal ground reference for control circuitry - must connect directly to PCB ground plane, isolated from PGND traces on top layer. |
| 27 | VDD | Bias supply (4.5–5.5V) for internal reference and logic - requires 2.2µF ceramic cap to PGND; must power up after or simultaneously with PVIN for soft-start integrity. |
| 28 | PVDD | Gate driver supply for low-side MOSFET - decoupled internally; not user-accessible for external connection. |
Key Features
| Feature | Design Value |
|---|---|
| Hyper Speed Control™ architecture | Enables stable operation at extreme VIN/VOUT ratios (e.g., 75V → 0.8V) while reducing required output capacitance by >50% vs. conventional controllers. |
| Any Capacitor™ stability | Supports zero-ESR polymer, high-ESR electrolytic, and ceramic output caps without external compensation - simplifies BOM and layout. |
| Adaptive on-time with internal compensation | Eliminates need for external loop compensation components; reduces design cycle time and board space versus voltage-mode or current-mode ICs. |
| Pre-biased load startup | Allows safe turn-on when output rail is already charged - prevents reverse current flow into downstream circuits in hot-swap or redundant power systems. |
| Integrated protection suite | Combines foldback current limit, hiccup-mode short-circuit response, thermal shutdown, and UVLO - reduces need for external fault management circuitry. |
Applications
| Distributed Power Systems | Communications Infrastructure |
|---|---|
Use Scenario: Point-of-load regulation in 48V intermediate bus architectures for server rack power distribution. IC Role / Device Role / Timing Role: Primary synchronous buck controller regulating 12V, 5V, or 3.3V rails from 48V backplane. Use Value: 95% peak efficiency at 48V→3.3V/4A enables higher power density and reduced cooling requirements in space-constrained telecom shelves. | Use Scenario: Powering baseband processing units and RF front-end modules in macrocell and small-cell wireless base stations. IC Role / Device Role / Timing Role: High-input-voltage buck converter supplying FPGA I/O and core voltages with fast transient response to burst traffic loads. Use Value: Hyper Speed Control™ achieves < 50µs output recovery from 80% load step, maintaining signal integrity in real-time PHY layers. |
| Industrial Power Supplies | Solar Energy Converters |
Use Scenario: DIN-rail mounted programmable logic controller (PLC) power modules converting 24–72V DC field bus to 5V/3.3V logic rails. IC Role / Device Role / Timing Role: Main DC/DC regulator with wide input range tolerance for variable battery or rectified AC inputs. Use Value: −40°C to +125°C junction rating and robust UVLO ensure reliable operation in uncontrolled factory environments with ambient swings. | Use Scenario: MPPT charge controller auxiliary supply powering microcontroller, sensors, and gate drivers from photovoltaic array output (up to 75V). IC Role / Device Role / Timing Role: High-efficiency buck stage converting variable PV voltage to stable 5V/3.3V for digital control subsystems. Use Value: 4.5V start-up capability allows operation during low-light conditions; Any Capacitor™ stability accommodates cost-effective bulk electrolytics in outdoor-rated enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5116MH/NOPB | External MOSFET driver (no integrated FETs); wider 6–100V input; requires external current sense resistor. | Better suited for >10A designs or where thermal separation of power stage is critical; lacks pre-biased startup. | Select when higher output current or discrete FET optimization is needed; adds complexity but improves thermal scalability. |
| TPS544B20RTWR | 40V max input; integrated 20A FETs; PMBus interface; fixed 500kHz fSW; smaller 4mm × 4mm QFN. | Targeted at high-current CPU/GPU VRMs; lacks 75V capability and adjustable frequency; no hiccup-mode protection. | Choose for compact, high-current digital power applications with telemetry needs; not viable for 48V+ industrial/solar inputs. |
Compared with LM5116MH/NOPB and TPS544B20RTWR, the MIC28510YJL-TR uniquely combines 75V input rating, integrated 4A FETs, adjustable frequency, and pre-biased startup in a single MLF package-making it optimal for space-constrained, high-input-voltage industrial and renewable energy systems where simplicity and ruggedness are prioritized over programmability or ultra-high current.
Availability
MIC28510YJL-TR is available at Aetrix Electronics and suitable for distributed power systems, communications infrastructure, and industrial power supplies requiring stable component supply with long lifecycle assurance and traceable sourcing.
Supply support for MIC28510YJL-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 semiconductor company specializing in power management, timing, and networking ICs before its acquisition by Microchip Technology in 2015.
The MIC28510YJL-TR belongs to Micrel's SuperSwitcher II™ family of high-voltage synchronous buck regulators, designed specifically for industrial, solar, and telecom applications demanding wide input range, high efficiency, and robust fault protection without external compensation.
FAQ
What is the maximum input voltage supported by the MIC28510YJL-TR?
The MIC28510YJL-TR supports a maximum input voltage of 75V on the PVIN pin, with absolute maximum rating of +76V. This allows direct regulation from 48V telecom buses, 60V solar arrays, or industrial 72V DC systems without pre-regulation stages. Operation above 75V violates the recommended operating range and risks permanent damage.
Does the MIC28510YJL-TR require external compensation components?
No, the MIC28510YJL-TR features internal compensation due to its adaptive on-time control architecture. Unlike traditional voltage-mode or current-mode controllers, it does not require external RC networks on the COMP or EA pins. This simplifies layout, reduces BOM count, and accelerates design validation-confirmed in the "Internal Compensation" feature list and functional description sections of the datasheet.
Can the MIC28510YJL-TR safely start up into a pre-biased output?
Yes, the MIC28510YJL-TR explicitly supports safe startup into a pre-biased load, as stated in the Features section. Its control architecture prevents reverse current flow during turn-on by disabling the low-side MOSFET until the internal reference ramps up, protecting downstream circuitry in hot-swap or redundant power configurations where the output rail may already be energized.
What is the purpose of the BST pin on the MIC28510YJL-TR?
The BST pin on the MIC28510YJL-TR provides the bootstrap supply for the high-side N-channel MOSFET gate driver. It requires a 0.1µF capacitor connected between BST and SW, plus a Schottky diode from VDD to BST. During low-side conduction, this capacitor charges; during high-side conduction, it supplies the elevated gate voltage needed to fully enhance the high-side FET-enabling efficient synchronous rectification without a floating supply.
How does the MIC28510YJL-TR implement overcurrent protection?
The MIC28510YJL-TR implements overcurrent protection using internal RDS(ON) sensing of the low-side MOSFET during OFF-time, eliminating external sense resistors. It features foldback current limiting (e.g., ~7A at VFB = 0.8V) and hiccup-mode response for hard shorts-triggering repeated soft-start cycles until fault clears. This is detailed in the "Current Limit" subsection of the Functional Description and confirmed in Electrical Characteristics tables.
MIC28510YJL-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- Hyper Speed Control®, SuperSwitcher II™
- Package/Case:
- 28-PowerVQFN
- 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):
- 4.5V
- Voltage - Input (Max):
- 75V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 24V
- Current - Output:
- 4A
- Frequency - Switching:
- 100kHz ~ 500kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (5x6)
MIC28510YJL-TR FAQ
1.How can I place an order for MIC28510YJL-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC28510YJL-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 MIC28510YJL-TR reliable?
The price and inventory of MIC28510YJL-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC28510YJL-TR is usually 5 days.
3.What payment methods are accepted for MIC28510YJL-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC28510YJL-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC28510YJL-TR?
MIC28510YJL-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC28510YJL-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 MIC28510YJL-TR?
For technical support, including MIC28510YJL-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC28510YJL-TR requirements.
6.How does Aetrix verify that MIC28510YJL-TR is sourced from the original manufacturer or authorized distributors?
All MIC28510YJL-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 MIC28510YJL-TR meets industry standards.
7.What is the process for return or replacement of MIC28510YJL-TR?
All MIC28510YJL-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC28510YJL-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 MIC28510YJL-TR part is unused and in its original packaging.
Return procedure for MIC28510YJL-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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