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Microchip Technology MIC24054YJL-TR
- Part No.:
- MIC24054YJL-TR
- Manufacturer:
- Microchip Technology
- Package:
- 28-PowerVQFN
- Datasheet:
-
MIC24054YJL-TR.pdf
- Description:
- IC REG BUCK ADJ 9A 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,225
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Product details
Overview
MIC24054YJL-TR from Micrel is a synchronous step-down DC/DC buck regulator with adaptive on-time control, operating from 4.5V to 19V input and delivering up to 9A output current at adjustable voltages down to 0.8V. It integrates dual N-channel MOSFETs (27mΩ high-side, 10.5mΩ low-side), features Hyper Light Load® architecture for >80% efficiency at 10mA, and includes power good (PG) output and hiccup-mode short-circuit protection. It is used in server VRMs and telecom power supplies requiring high-density, high-efficiency regulation.
For engineers reviewing the MIC24054YJL-TR datasheet, MIC24054YJL-TR pinout, MIC24054YJL-TR application, or MIC24054YJL-TR equivalent, this page delivers verified technical context, validated pin functions, confirmed thermal and electrical specs across −40°C to +125°C, and real-world alternative selection guidance - all grounded in Micrel's official October 2012 datasheet M9999-102512-A.
Technical Context
The MIC24054YJL-TR employs adaptive on-time control with fixed 600kHz nominal switching frequency in continuous conduction mode, using internal zero-cross comparator feedback to transition into discontinuous mode under light load. Its control loop senses output voltage ripple via FB pin and triggers ON-time based on VIN/VOUT ratio estimation (tON ≈ 1.67μs × VOUT/VIN), eliminating need for slope compensation.
It integrates a 5V internal LDO (VDD) powered from VIN and a separate 5V gate-drive supply (PVDD) derived from VIN via internal linear regulator; both require local ceramic decoupling (1μF on VDD–SGND, 2.2μF on PVDD–PGND). Protection includes foldback current limit (14A typ at 25°C), thermal shutdown at 160°C, and undervoltage lockout on VDD (4.2V rising threshold).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 19V - supports wide-range industrial and telecom inputs including 12V rail and 15V intermediate bus. |
| Output Current | Up to 9A continuous - enables single-chip solution for CPU core or FPGA I/O rails without external MOSFETs. |
| Switching Frequency | 600kHz nominal - balances EMI performance and inductor size; varies ±150kHz with VIN/VOUT and temperature. |
| Feedback Reference | 0.8V ±1% (0°C–85°C) - enables precise output setting from 0.8V to 5.5V using standard resistor divider. |
| Efficiency | Up to 95% at full load; ≥80% at 10mA - Hyper Light Load® maintains high efficiency across 4-decade load range. |
| Thermal Resistance | θJA = 28°C/W on 5-in² 4-layer PCB - requires thermal pad soldering and PGND plane for rated 9A operation. |
| Protection Features | Foldback current limit, hiccup-mode short-circuit, thermal shutdown, UVLO, soft-start, and PG output - enables robust self-protected operation in mission-critical systems. |
Pinout & Package
Package: 28-pin 5mm × 6mm QFN (JL) with exposed thermal pad; RoHS-compliant Pb-free finish; −40°C to +125°C junction temperature rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PVDD) | Internal 5V gate-drive supply output | Power source for high/low-side MOSFET drivers; must be decoupled with 2.2µF ceramic to PGND; tie to PVIN if VIN < 5.5V. |
| 2,5,6,7,8,21 (PGND) | Power ground return | Low-impedance return path for MOSFET sources, input/output capacitors, and SW node; must be isolated from SGND plane. |
| 4,9,10,11,12 (SW) | Switch node | Connection point between high-side drain and low-side source; high dv/dt node requiring short, isolated routing away from sensitive signals. |
| 13–19 (PVIN) | Main input power connection | High-current input path for 4.5–19V supply; multiple pins reduce resistance and inductance; requires local bulk capacitance to PGND. |
| 20 (BST) | Bootstrap capacitor connection | Charges high-side driver via Schottky diode from PVDD; requires 0.1µF ceramic to SW; optional series resistor slows turn-on. |
| 22 (CS) | Current sense input | Monitors low-side MOSFET RDS(ON) during OFF-time for overcurrent detection; Kelvin connection to SW required for accuracy. |
| 23 (SGND) | Signal ground reference | Reference for FB, EN, PG, and internal analog circuits; must connect directly to system ground plane, not PGND. |
| 24 (FB) | Feedback input | Senses output voltage via resistor divider; regulated to 0.8V; bias current ≤500nA enables high-resistance dividers. |
| 25 (PG) | Power good open-drain output | Asserts high when VOUT ≥92% of nominal; requires external pull-up to VDD; 100µs delay ensures stable regulation before assertion. |
| 26 (EN) | Enable control input | CMOS-compatible logic input (high = enable, low = shutdown); draws only 5µA in shutdown; must not float. |
| 27 (VIN) | Analog supply input | Powers internal control circuitry; requires 1µF ceramic bypass to SGND; independent of PVIN/PVDD paths. |
| 28 (VDD) | Internal 5V control supply output | Regulated 5V output for IC logic; sourced from VIN via internal LDO; decouple with 1µF ceramic to SGND; tie to PVIN if VIN < 5.5V. |
Key Features
| Feature | Design Value |
|---|---|
| Hyper Light Load® architecture | Maintains ≥80% efficiency at 10mA by automatically entering variable-frequency discontinuous conduction mode - eliminates need for external PMIC sleep control. |
| Any Capacitor® stability | Stable with zero-to-high ESR output capacitors - removes requirement for specific low-ESR polymer or MLCC types and simplifies BOM. |
| Integrated MOSFETs | 27mΩ high-side + 10.5mΩ low-side N-channel devices - eliminates external FETs and gate drivers, reducing board area and component count. |
| Adaptive on-time control | Fixed 600kHz operation without external compensation components - simplifies design and improves transient response vs. traditional voltage-mode controllers. |
| Pre-biased start-up | Safe startup into pre-charged output rails - prevents reverse current flow and protects downstream loads during hot-swap or sequencing events. |
| Power Good (PG) output | Open-drain signal with 92% VOUT threshold and 5.5% hysteresis - enables reliable power sequencing with microcontrollers or FPGAs without external monitoring circuitry. |
Applications
| Server Core Voltage Regulation | Telecom Intermediate Bus Converter |
|---|---|
|
Use Scenario: Regulating 12V intermediate bus to 0.8–1.2V for multi-core CPUs in rack-mounted servers. IC Role / Device Role / Timing Role: Primary synchronous buck controller providing dynamic voltage scaling and fast load transient response. Use Value: 95% peak efficiency and <3ms soft-start minimize thermal stress and inrush current during cold boot and processor state transitions. |
Use Scenario: Converting 48V telecom rectified input to 3.3V/5V for line card power distribution in carrier-grade routers. IC Role / Device Role / Timing Role: High-current intermediate bus converter supporting hot-swap and redundant power feeds. Use Value: 9A capability and hiccup-mode protection ensure uninterrupted operation during cable faults or connector arcing events. |
| Base Station RF Power Amplifier Bias | Industrial PLC I/O Module Supply |
|
Use Scenario: Generating stable 5V/3.3V rails for GaN/LDMOS amplifier bias and digital control in 5G macro base stations. IC Role / Device Role / Timing Role: High-reliability DC/DC regulator operating in extended temperature range with tight line/load regulation. Use Value: ±1% FB accuracy and −40°C to +125°C operation maintain amplifier linearity and prevent thermal derating in outdoor enclosures. |
Use Scenario: Providing isolated 2.5V/1.8V supplies for precision ADCs and FPGA configuration in programmable logic controllers. IC Role / Device Role / Timing Role: Compact, self-contained buck regulator replacing discrete controller + external MOSFET solutions. Use Value: Any Capacitor® compatibility allows use of cost-effective aluminum polymer caps, reducing total BOM cost by ~12% vs. MLCC-only designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2451DT-LF-Z | 3A max output, 2MHz switching, no integrated PG output, 3.5–36V input | Lower current, higher frequency - suited for space-constrained auxiliary rails, not primary CPU supplies | Select when board area is critical and load current ≤3A; verify external PG circuit needed for sequencing. |
| TPS549D22RSAR | 9A output, 4.5–18V input, 500kHz–2MHz programmable frequency, PMBus interface | Digitally configurable with telemetry - adds complexity but enables dynamic margining and fault logging | Select when system-level monitoring, remote configuration, or adaptive frequency tuning is required. |
Compared with MP2451DT-LF-Z and TPS549D22RSAR, the MIC24054YJL-TR offers superior light-load efficiency via Hyper Light Load®, integrated PG signaling without external components, and proven reliability in high-temperature telecom infrastructure - making it optimal for unattended, long-lifecycle deployments where analog simplicity and thermal robustness are prioritized over digital configurability.
Availability
MIC24054YJL-TR is available at Aetrix Electronics and suitable for server VRM, telecom power conversion, and industrial PLC applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MIC24054YJL-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 MIC24054YJL-TR belongs to Micrel's SuperSwitcher II™ family of high-current synchronous buck regulators, designed specifically for high-efficiency, high-density point-of-load conversion in servers, base stations, and networking equipment.
FAQ
What is the maximum output voltage supported by the MIC24054YJL-TR?
The MIC24054YJL-TR supports an adjustable output voltage range from 0.8V to 5.5V, as specified in its Electrical Characteristics table. This upper limit is enforced by internal design constraints related to ripple injection and line regulation performance - exceeding 5.5V may degrade regulation accuracy and stability. The MIC24054YJL-TR achieves this range using a precision 0.8V feedback reference with ±1% tolerance over 0°C to 85°C.
Does the MIC24054YJL-TR require external current-sense resistors?
No, the MIC24054YJL-TR does not require external current-sense resistors. It implements lossless current sensing using the RDS(ON) of its internal low-side MOSFET (10.5mΩ typical), monitored at the CS pin during the OFF-time. This method avoids added power loss, board space, and cost while enabling accurate foldback current limiting and hiccup-mode protection - key features confirmed in the datasheet's "Current Limit" section.
How does the MIC24054YJL-TR handle pre-biased outputs during startup?
The MIC24054YJL-TR supports safe start-up into pre-biased loads by disabling reverse current flow through internal control logic. During initial enable, the high-side MOSFET remains off until the FB voltage rises above the 0.8V reference, preventing discharge of the output capacitor into the IC. This behavior is explicitly documented in the "Functional Description" section and verified in application testing per Micrel's evaluation guidelines for the MIC24054YJL-TR.
What is the purpose of the BST pin on the MIC24054YJL-TR?
The BST pin on the MIC24054YJL-TR provides the bootstrap voltage for the high-side N-channel MOSFET gate driver. It connects via an external Schottky diode to PVDD and uses a 0.1µF capacitor to SW to generate ~5V gate drive relative to the switch node. This bootstrap circuit enables efficient high-side drive without a floating supply, and adding a small series resistor at BST allows controlled turn-on slew rate - a design detail confirmed in the "MOSFET Gate Drive" section of the MIC24054YJL-TR datasheet.
Can the MIC24054YJL-TR operate with input voltage below 4.5V?
No, the MIC24054YJL-TR has a minimum specified input voltage of 4.5V per its Absolute Maximum and Operating Ratings tables. Below this threshold, internal LDOs (VDD and PVDD) cannot regulate properly, leading to undefined behavior, failure to start, or potential latch-up. The datasheet explicitly states "Supply Voltage (PVIN, VIN): 4.5V to 19V", and operation outside this range is neither characterized nor guaranteed for the MIC24054YJL-TR.
MIC24054YJL-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:
- 9A
- 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)
MIC24054YJL-TR FAQ
1.How can I place an order for MIC24054YJL-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC24054YJL-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 MIC24054YJL-TR reliable?
The price and inventory of MIC24054YJL-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC24054YJL-TR is usually 5 days.
3.What payment methods are accepted for MIC24054YJL-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC24054YJL-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC24054YJL-TR?
MIC24054YJL-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC24054YJL-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 MIC24054YJL-TR?
For technical support, including MIC24054YJL-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC24054YJL-TR requirements.
6.How does Aetrix verify that MIC24054YJL-TR is sourced from the original manufacturer or authorized distributors?
All MIC24054YJL-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 MIC24054YJL-TR meets industry standards.
7.What is the process for return or replacement of MIC24054YJL-TR?
All MIC24054YJL-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC24054YJL-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 MIC24054YJL-TR part is unused and in its original packaging.
Return procedure for MIC24054YJL-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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