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Microchip Technology MIC28512-1YFL-TR
- Part No.:
- MIC28512-1YFL-TR
- Manufacturer:
- Microchip Technology
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
MIC28512-1YFL-TR.pdf
- Description:
- IC REG BUCK ADJ 2A 24FCQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,494
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Product details
Overview
MIC28512-1YFL-TR from Microchip Technology is a synchronous step-down DC/DC regulator with integrated high-side and low-side N-channel MOSFETs, delivering up to 2A output current across a 4.6V–70V input range. It features HyperLight Load® architecture, adjustable 200–680 kHz switching frequency, and ±1% output voltage accuracy down to 0.8V - optimized for industrial power supplies and high-voltage single-board systems.
For engineers reviewing the MIC28512-1YFL-TR datasheet, MIC28512-1YFL-TR pinout, MIC28512-1YFL-TR application, or MIC28512-1YFL-TR equivalent, key selection criteria include wide VIN capability, internal 5V LDO, programmable current limit, PGOOD signaling, and thermally enhanced 24-pin 3 mm × 4 mm FCQFN package with multiple PGND/SW/PVIN ePad connections.
Technical Context
The MIC28512-1YFL-TR employs adaptive on-time control with fixed tON estimation and minimum off-time (200 ns typical) to maintain stable operation across wide input-output ratios. Its HyperLight Load® architecture enables ultra-low quiescent current (0.4 mA typ.) and high light-load efficiency without external compensation.
It integrates dual N-MOSFETs (77 mΩ high-side, 43 mΩ low-side), a 5V internal LDO (4.8–5.4 V), and comprehensive protection: hiccup-mode short-circuit response, thermal shutdown (160°C), UVLO on VDD and EN, and programmable current limit via ILIM resistor. The device supports pre-biased start-up and operates from –40°C to +125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.6 V to 70 V - supports direct connection to 48 V industrial rails, automotive battery transients, and wall transformer inputs without pre-regulation. |
| Output Current | Up to 2 A continuous - sufficient for powering FPGAs, microcontrollers, and analog subsystems in distributed supply architectures. |
| Feedback Reference | 0.792–0.808 V (±1% at 25°C) - enables precise output regulation down to 0.8 V with external resistor divider. |
| Switching Frequency | 200 kHz to 680 kHz (programmable via FREQ pin) - allows optimization of size (higher fSW) vs. efficiency (lower fSW) and EMI filtering requirements. |
| Quiescent Current | 0.4 mA typical at 12 V input - ensures minimal standby power draw in always-on industrial monitoring systems. |
| Thermal Resistance θJA | 30 °C/W - achieved via 24-pin FCQFN with exposed PGND ePad (pins 10, 11, 22, 23, 26) and PVIN ePad (pin 25), enabling 2 A operation at +85°C ambient without forced air. |
| Protection Features | Hiccup-mode short-circuit, thermal shutdown (160°C), VDD UVLO (4.2 V threshold), EN-controlled shutdown (0.6 V logic low), and PGOOD open-drain flag - reduces need for external supervision circuitry. |
Pinout & Package
Package: 24-pin 3 mm × 4 mm FCQFN (FL) with five exposed thermal pads - PVIN (pin 25), PGND (pins 10, 11, 22, 23, 26), and SW (pins 12, 21, 27) - designed for low-inductance, high-current PCB layout and efficient thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DL) | Low-side gate drive | Internal connection to low-side MOSFET gate; must remain unconnected - no external driver required. |
| 2, 10, 11, 22, 23, 26 (PGND) | Power ground return | Source node for low-side MOSFET; requires low-impedance copper pour tie to input capacitor negative terminal and inductor ground. |
| 3 (DH) | High-side gate drive | Internal connection to high-side MOSFET gate; must remain unconnected - no external driver required. |
| 4, 7, 8, 9, 25 (PVIN) | Power input supply | Main high-voltage input path for internal switches; all pins must be shorted and bypassed locally with ceramic capacitors. |
| 5 (LX) | Bootstrap return / zero-current detection | Return node for BST capacitor and SW node; used by controller to detect inductor current zero-crossing for DCM operation. |
| 6 (BST) | Bootstrap supply | Charges high-side gate driver via 0.1 µF capacitor to LX; enables full enhancement of high-side N-MOSFET. |
| 12, 21, 27 (SW) | Switch node | Drain connection of both internal MOSFETs; ties directly to inductor input and must be minimized in loop area for EMI control. |
| 13 (AGND) | Analog ground reference | Separate ground return for FB, EN, PGOOD, and internal error amplifier - must be isolated from PGND until single-point star connection. |
| 14 (FB) | Feedback input | Senses output voltage via resistive divider; regulates output to 0.8 V reference with ±1% accuracy over temperature. |
| 15 (PGOOD) | Power-good open-drain output | Asserts high-impedance when FB ≥ 90% of reference (e.g., ≥0.72 V); requires external pull-up for system power sequencing. |
| 16 (EN) | Enable control input | Active-high logic input (1.8 V threshold); enables full operation or forces ultra-low shutdown current (0.1 µA typ.) when pulled low. |
| 17 (VIN) | LDO input supply | Primary power input for internal 5 V regulator; accepts 4.6–70 V and requires local 1 µF AGND decoupling. |
| 18 (ILIM) | Current-limit programming | Connects to SW node via resistor to set foldback current limit threshold - enables precise overcurrent protection tuning. |
| 19 (VDD) | Internal 5 V regulator output | Supplies bias for control circuitry; requires 1 µF bypass capacitor; connects to VIN if input <5.5 V. |
| 20 (PVDD) | Low-side driver supply | 5 V supply for low-side gate driver; tied externally to VDD and bypassed with 1 µF to PGND. |
| 24 (FREQ) | Switching frequency adjust | Voltage-programmed pin: connect to VIN for 680 kHz, or use resistor divider for 200–680 kHz range - sets tON estimator. |
Key Features
| Feature | Design Value |
|---|---|
| HyperLight Load® architecture | Enables discontinuous conduction mode (DCM) at light loads to reduce switching losses and maintain >85% efficiency at 10 mA output - critical for always-on sensor nodes. |
| Integrated 5 V LDO (VDD) | Eliminates need for external bias rail; delivers regulated 5 V ±4% at 10 mA while supporting dropout operation down to VIN = 4.6 V. |
| Programmable hiccup-mode protection | Configurable current limit via ILIM resistor and automatic restart after fault clearance - prevents thermal runaway during sustained overload or short-circuit events. |
| Fixed 5 ms soft-start | Internally controlled ramp limits inrush current into output capacitor; prevents input voltage sag and avoids false PGOOD assertion during power-up. |
| Pre-biased output start-up support | Allows safe turn-on when output capacitor is pre-charged (e.g., in hot-swap or redundant supply systems) without reverse current flow or latch-up. |
| Thermally enhanced FCQFN | 24-pin 3×4 mm package with five dedicated thermal pads (PVIN, PGND, SW) achieves 30 °C/W θJA, enabling 2 A operation at +85°C ambient with 2-layer PCB. |
Applications
| Industrial Power Supplies | Distributed Supply Regulation |
|---|---|
|
Use Scenario: Central 48 V backplane powering multiple 3.3 V/5 V point-of-load rails in PLC or motor drive cabinets. IC Role / Device Role / Timing Role: Primary buck regulator converting 48 V to 5 V for FPGA I/O banks and communication peripherals. Use Value: Wide 4.6–70 V input handles brownouts and surges; 2 A output supports multi-rail fanout; PGOOD enables sequenced startup of downstream regulators. |
Use Scenario: Local 24 V-to-3.3 V conversion on remote I/O modules with space-constrained PCB layout. IC Role / Device Role / Timing Role: Compact, self-contained buck converter eliminating discrete MOSFETs, drivers, and external compensation. Use Value: FCQFN package minimizes footprint; internal 5 V LDO powers local logic; HyperLight Load® extends battery life in wireless sensor nodes. |
| Base Station Power Supplies | Wall Transformer Regulation |
|
Use Scenario: Intermediate 28 V rail conversion to 12 V for RF power amplifiers in 4G/5G small cells. IC Role / Device Role / Timing Role: High-efficiency synchronous buck stage operating at 400 kHz to balance EMI and thermal performance. Use Value: 77/43 mΩ RDS(on) MOSFETs minimize conduction loss; thermal shutdown protects against airflow blockage in sealed enclosures. |
Use Scenario: Regulating unregulated 12–24 V AC/DC adapter output to stable 5 V for USB-powered devices. IC Role / Device Role / Timing Role: Post-regulator improving line/load regulation and ripple rejection beyond basic transformer-rectifier-capacitor stage. Use Value: ±1% feedback accuracy ensures USB compliance; EN pin enables standby mode; PGOOD confirms valid output before system wake-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QPWPRQ1 | 4.5–65 V input, 1 A output, 100–2.2 MHz programmable frequency, no integrated 5 V LDO - requires external bias. | Lacks internal VDD regulator and PGOOD; better suited for cost-sensitive automotive body electronics where external LDO is already present. | Select LM5164QPWPRQ1 only if system already provides 3.3/5 V bias and 1 A output suffices; MIC28512-1YFL-TR preferred for self-contained 2 A designs. |
| MPQ4312GR-A | 4.5–60 V input, 2 A output, fixed 500 kHz frequency, integrated bootstrap diode, no ILIM pin - fixed current limit. | Uses internal bootstrap diode instead of external capacitor; lacks programmable current limit and hiccup-mode recovery - less flexible for ruggedized industrial use. | Choose MPQ4312GR-A for simplified layout where fixed protection thresholds are acceptable; MIC28512-1YFL-TR offers superior configurability for mission-critical systems. |
Compared with LM5164QPWPRQ1 and MPQ4312GR-A, the MIC28512-1YFL-TR uniquely combines 2 A capability, internal 5 V LDO, programmable current limit, and HyperLight Load® efficiency - making it optimal for space- and reliability-constrained industrial and telecom power stages requiring autonomous operation.
Availability
MIC28512-1YFL-TR is available at Aetrix Electronics and suitable for industrial power supplies, distributed supply regulation, base station power supplies, and wall transformer regulation requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MIC28512-1YFL-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
Microchip Technology Inc. is a leading provider of microcontrollers, analog components, and power management ICs, serving industrial, automotive, and communications markets with high-reliability semiconductor solutions.
The MIC28512 product line delivers high-input-voltage synchronous buck regulators with integrated MOSFETs and advanced control architectures - designed specifically for rugged industrial and telecom power conversion where wide VIN, thermal robustness, and autonomous protection are mandatory.
FAQ
What is the maximum input voltage rating for the MIC28512-1YFL-TR?
The MIC28512-1YFL-TR has an absolute maximum input voltage rating of +76 V on PVIN/VIN pins relative to PGND, with a recommended operating range of +4.6 V to +70 V. This allows direct interface with 48 V industrial buses and automotive systems subject to load-dump transients, provided external TVS clamping is applied per Microchip's layout guidelines in DS20005524B.
Does the MIC28512-1YFL-TR support pre-biased output start-up?
Yes, the MIC28512-1YFL-TR supports pre-biased output start-up, as confirmed in Figures 2-47 and 2-48 of the datasheet. When the output capacitor is pre-charged, the device initiates soft-start without forcing reverse current through the inductor - essential for hot-swap and redundant power supply applications where output voltage must remain stable during rail insertion.
How is the current limit configured on the MIC28512-1YFL-TR?
The MIC28512-1YFL-TR uses the ILIM pin (pin 18) to program current limit by connecting a resistor between ILIM and the SW node. The current-limit threshold is determined by the resistor value and internal sensing circuitry, enabling precise foldback protection tuning - detailed in Table 1-1 and Figure 2-5 of DS20005524B. No external sense resistor is required.
What is the purpose of the DL and DH pins on the MIC28512-1YFL-TR?
Pins DL (pin 1) and DH (pin 3) are internal gate drive connections for the low-side and high-side MOSFETs, respectively. Per datasheet Table 3-1, both pins must remain unconnected or floating in normal operation - they are not intended for external gate driving or probing, and connecting them may disrupt internal gate control timing or cause malfunction.
Can the MIC28512-1YFL-TR operate without an external bootstrap capacitor?
No - the MIC28512-1YFL-TR requires a 0.1 µF ceramic capacitor connected between BST (pin 6) and LX (pin 5) to charge the high-side gate driver. Omitting this capacitor prevents proper high-side MOSFET enhancement, resulting in no output regulation or potential damage due to shoot-through. A series resistor may be added for damping, but the capacitor is mandatory.
MIC28512-1YFL-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- HyperLight Load®
- Package/Case:
- 24-VFQFN Exposed Pad
- 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):
- 4.6V
- Voltage - Input (Max):
- 70V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 59.5V
- Current - Output:
- 2A
- Frequency - Switching:
- 200kHz ~ 680kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-FCQFN (3x4)
MIC28512-1YFL-TR FAQ
1.How can I place an order for MIC28512-1YFL-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC28512-1YFL-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 MIC28512-1YFL-TR reliable?
The price and inventory of MIC28512-1YFL-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC28512-1YFL-TR is usually 5 days.
3.What payment methods are accepted for MIC28512-1YFL-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC28512-1YFL-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC28512-1YFL-TR?
MIC28512-1YFL-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC28512-1YFL-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 MIC28512-1YFL-TR?
For technical support, including MIC28512-1YFL-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC28512-1YFL-TR requirements.
6.How does Aetrix verify that MIC28512-1YFL-TR is sourced from the original manufacturer or authorized distributors?
All MIC28512-1YFL-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 MIC28512-1YFL-TR meets industry standards.
7.What is the process for return or replacement of MIC28512-1YFL-TR?
All MIC28512-1YFL-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC28512-1YFL-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 MIC28512-1YFL-TR part is unused and in its original packaging.
Return procedure for MIC28512-1YFL-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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