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Microchip Technology MIC24055YJL-TR
- Part No.:
- MIC24055YJL-TR
- Manufacturer:
- Microchip Technology
- Package:
- 28-PowerVQFN
- Datasheet:
-
MIC24055YJL-TR.pdf
- Description:
- IC REG BUCK ADJ 12A 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,790
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Product details
Overview
MIC24055YJL-TR from Micrel is a constant-frequency, synchronous buck regulator with adaptive on-time control architecture, delivering up to 12A output current across 4.5V–19V input range, adjustable 0.8V–5.5V output voltage with ±1% feedback accuracy, and 600kHz switching frequency-designed for high-efficiency point-of-load conversion in telecom power systems.
For engineers reviewing the MIC24055YJL-TR datasheet, MIC24055YJL-TR pinout, MIC24055YJL-TR application, or MIC24055YJL-TR equivalent, this page delivers verified technical context, validated pin functions, confirmed protection features (hiccup-mode short-circuit, thermal shutdown, PG output), and real-world design constraints including Hyper Speed Control transient response and Any Capacitor™ stability without external compensation.
Technical Context
The MIC24055YJL-TR implements adaptive on-time control with fixed 600kHz nominal switching frequency and 300ns minimum off-time, enabling fast load transient recovery while maintaining stable operation across wide VIN/VOUT ratios (e.g., 19V→0.8V). Its internal current sensing uses low-side MOSFET RDS(ON) - eliminating external sense resistors - and integrates a 5V VDD LDO regulator powered from VIN.
Control loop stability relies on feedback voltage ripple (20–100mV recommended) sensed at the FB pin, with ripple injection required for ultra-low-ESR capacitors. The device supports pre-biased startup and includes integrated soft-start (3ms ramp), foldback current limiting, and open-drain power-good signaling referenced to 92% of nominal VOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 19V - supports wide-range industrial and telecom inputs including 12V and 15V rails. |
| Max Output Current | 12A continuous - enables single-chip solutions for high-current FPGA, ASIC, and processor core supplies. |
| Output Voltage Range | 0.8V to 5.5V adjustable - covers DDR memory, GPU cores, and I/O rail requirements via resistor divider on FB. |
| Feedback Accuracy | ±1% over 0°C–85°C - ensures tight regulation for sensitive digital loads without calibration. |
| Switching Frequency | 600kHz typical - balances efficiency, inductor size, and EMI filtering requirements. |
| Efficiency | Up to 95% - achieved using integrated 13mΩ/5.3mΩ synchronous MOSFETs and Hyper Speed Control architecture. |
| Junction Temp Range | −40°C to +125°C - qualified for extended-temperature industrial and base station environments. |
| Package | 28-pin 5mm × 6mm QFN - thermally enhanced layout with multiple PGND pins and exposed thermal pad. |
Pinout & Package
Package: 28-pin QFN, 5mm × 6mm, 0.5mm pitch, exposed thermal pad (JL suffix). Designed for high-current PCB layouts with separate PGND and SGND planes and minimized SW node loop area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVIN (Pins 13–19) | High-side MOSFET drain input | Primary power input path (4.5–19V); requires local ceramic bypass to PGND; multiple pins reduce IR drop and thermal stress. |
| SW (Pins 4,9–12) | Switch node | Connection between high-side source and low-side drain; high dv/dt node requiring short, isolated routing away from analog signals. |
| PGND (Pins 2,5–8,21) | Power ground return | Low-impedance return for power stage, MOSFET sources, and input/output capacitors; must be separated from SGND plane. |
| FB (Pin 24) | Feedback input | Senses output via resistor divider; regulated to 0.8V reference; ripple injection may be needed for low-ESR capacitors. |
| PG (Pin 25) | Open-drain power-good | Asserts high when VOUT ≥ 92% of setpoint; requires external pull-up to VDD; used for system sequencing and fault monitoring. |
| EN (Pin 26) | Enable control | CMOS-compatible logic input (high = enable, low = shutdown); draws only 5µA in shutdown mode. |
| VDD (Pin 28) | Internal 5V LDO output | Supplies gate drivers and internal circuitry; derived from VIN; must be bypassed with 1µF ceramic to SGND. |
| BST (Pin 20) | Bootstrap supply | Drives high-side MOSFET gate; requires 0.1µF capacitor to SW and Schottky diode from PVDD; optional series resistor controls turn-on speed. |
Key Features
| Feature | Design Value |
|---|---|
| Hyper Speed Control™ architecture | Enables <1µs transient response and reduces required output capacitance by >50% versus conventional buck controllers. |
| Any Capacitor™ stability | Operates stably with zero-to-high ESR output capacitors - eliminates need for specific capacitor types or external compensation networks. |
| Integrated current sensing | Uses internal low-side MOSFET RDS(ON) for overcurrent detection - saves board space, cost, and conduction losses vs. discrete sense resistors. |
| Hiccup-mode short-circuit protection | Enters safe, low-duty-cycle restart cycle during hard shorts - prevents thermal runaway and enables automatic recovery without manual reset. |
| Pre-biased startup support | Allows safe turn-on into an already energized output rail - critical for hot-swap and redundant power systems. |
| Thermal shutdown with hysteresis | Shuts down at 160°C junction temperature and re-enables at 145°C - protects against sustained overload or poor heatsinking conditions. |
Applications
| Server Point-of-Load Supply | Telecom Line Card Power |
|---|---|
Use Scenario: Delivering 1.2V/12A to high-performance CPU cores in 1U rack servers with strict thermal and efficiency targets. IC Role / Device Role / Timing Role: Primary synchronous buck regulator managing dynamic load transients during burst-mode computing. Use Value: Hyper Speed Control maintains <±25mV output deviation under 10A/µs load steps, reducing need for bulk capacitance and PCB area. |
Use Scenario: Generating 3.3V/10A for packet processing ASICs on carrier-grade router line cards operating at −40°C to +85°C ambient. IC Role / Device Role / Timing Role: High-reliability DC/DC converter with hiccup-mode protection and PG signaling for system-level power sequencing. Use Value: ±1% feedback accuracy and −40°C to +125°C junction rating ensure consistent regulation across extended temperature ranges without derating. |
| Base Station RF Power Amplifier Bias | Industrial PLC I/O Module Supply |
Use Scenario: Providing 5.0V/8A bias supply to GaN RF power amplifiers in 5G massive MIMO active antenna units. IC Role / Device Role / Timing Role: Efficient intermediate bus converter stepping down 12V mid-rail to stable amplifier bias voltage. Use Value: 95% peak efficiency at 5V/8A minimizes heat generation inside sealed RF enclosures, extending component lifetime. |
Use Scenario: Generating isolated 2.5V/6A supply for analog sensor front-ends and ADCs in factory automation PLC modules. IC Role / Device Role / Timing Role: Low-noise, tightly regulated buck regulator supporting precision measurement circuits. Use Value: 0.8V reference with ±1% tolerance and low 50nA FB bias current preserve ADC accuracy and reduce gain drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4470AGL-Z | 40V max input, 8A output, 500kHz switching, no integrated PG pin, requires external compensation. | Better suited for higher-input industrial systems (>24V), but lacks power-good signaling and Any Capacitor™ stability. | Select MPQ4470AGL-Z only if input exceeds 19V or thermal budget allows lower current density. |
| TPS544B20RTWR | 18V max input, 15A output, 700kHz, PMBus interface, external VOUT programming, tighter ±0.5% ref accuracy. | Targeted at digitally controlled server VRMs with telemetry; adds complexity and cost for analog-only designs. | Choose TPS544B20RTWR only when digital monitoring, margining, or multi-phase synchronization is required. |
Compared with MPQ4470AGL-Z and TPS544B20RTWR, the MIC24055YJL-TR provides optimal balance of analog simplicity, proven transient performance, and integrated protection - making it ideal for cost-sensitive, high-reliability telecom and industrial buck applications where PG signaling and pre-bias startup are mandatory.
Availability
MIC24055YJL-TR is available at Aetrix Electronics and suitable for server power delivery, telecom line card design, and 5G base station RF biasing requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for MIC24055YJL-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 power IC designer acquired by Microchip Technology in 2015; known for high-performance DC/DC regulators, timing devices, and Ethernet PHYs.
The MIC24055YJL-TR belongs to Micrel's SuperSwitcher II™ family - engineered specifically for high-current, high-efficiency point-of-load conversion in space-constrained telecom and computing infrastructure.
FAQ
What is the maximum supported input voltage for the MIC24055YJL-TR?
The MIC24055YJL-TR supports an absolute maximum PVIN voltage of +29V, but its specified operating input range is 4.5V to 19V. Exceeding 19V violates the guaranteed electrical characteristics and may cause premature failure due to overstress on internal MOSFETs and gate drivers. Always maintain PVIN ≤ 19V in normal operation to ensure reliability and compliance with datasheet parameters.
Does the MIC24055YJL-TR require external compensation components?
No, the MIC24055YJL-TR does not require external compensation components. Its adaptive on-time control architecture and Any Capacitor™ stability design eliminate the need for external RC networks or type-II/type-III compensators. Stability is maintained across zero-to-high ESR output capacitors, simplifying layout and reducing BOM count - a key differentiator versus traditional voltage-mode or current-mode controllers.
How does the MIC24055YJL-TR handle startup into a pre-biased output?
The MIC24055YJL-TR supports safe startup into a pre-biased output rail via its dedicated control logic that disables high-side FET turn-on until the FB voltage falls below the internal reference. This prevents reverse current flow and potential damage to upstream sources or downstream loads - a critical feature for hot-swap and redundant power architectures where the MIC24055YJL-TR may be inserted while the output remains energized.
What is the purpose of the BST pin on the MIC24055YJL-TR?
The BST (bootstrap) pin on the MIC24055YJL-TR supplies gate drive voltage to the internal high-side N-channel MOSFET. It connects via a Schottky diode to PVDD and uses a 0.1µF capacitor to SW to generate ~10V gate-source voltage during high-side conduction. Adding a small resistor in series with BST slows high-side turn-on, reducing EMI and preventing shoot-through - a practical tuning option not available in most integrated buck regulators.
Can the MIC24055YJL-TR operate with an output voltage higher than 5.5V?
No, the MIC24055YJL-TR is not rated for output voltages above 5.5V. Datasheet specifications explicitly limit the adjustable output range to 0.8V–5.5V, and exceeding this risks violating internal reference and error amplifier operating conditions. Attempting >5.5V operation may cause instability, inaccurate regulation, or accelerated degradation of the feedback network - always adhere to the 5.5V upper bound defined in the MIC24055YJL-TR Electrical Characteristics table.
MIC24055YJL-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):
- 19V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 12A
- Frequency - Switching:
- 600kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (5x6)
MIC24055YJL-TR FAQ
1.How can I place an order for MIC24055YJL-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC24055YJL-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 MIC24055YJL-TR reliable?
The price and inventory of MIC24055YJL-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC24055YJL-TR is usually 5 days.
3.What payment methods are accepted for MIC24055YJL-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC24055YJL-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC24055YJL-TR?
MIC24055YJL-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC24055YJL-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 MIC24055YJL-TR?
For technical support, including MIC24055YJL-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC24055YJL-TR requirements.
6.How does Aetrix verify that MIC24055YJL-TR is sourced from the original manufacturer or authorized distributors?
All MIC24055YJL-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 MIC24055YJL-TR meets industry standards.
7.What is the process for return or replacement of MIC24055YJL-TR?
All MIC24055YJL-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC24055YJL-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 MIC24055YJL-TR part is unused and in its original packaging.
Return procedure for MIC24055YJL-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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