My Inquiry
My Account
Microchip Technology MIC28500YJL-TR
- Part No.:
- MIC28500YJL-TR
- Manufacturer:
- Microchip Technology
- Package:
- 28-PowerVQFN
- Datasheet:
-
MIC28500YJL-TR.pdf
- Description:
- IC REG BUCK ADJ 4A 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,976
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MIC28500YJL-TR from Micrel is a 30V–75V input, 4A synchronous buck regulator with Hyper Speed Control™ adaptive on-time architecture, ±1% feedback accuracy at 0.8V reference, and 100kHz–500kHz adjustable switching frequency-designed for high-vin/low-vout DC-DC conversion in telecom power supplies.
For engineers reviewing the MIC28500YJL-TR datasheet, MIC28500YJL-TR pinout, MIC28500YJL-TR application, or MIC28500YJL-TR equivalent, key selection considerations include its 28-pin MLF® package, internal MOSFET RDS(ON) (175mΩ top / 31mΩ bottom), hiccup-mode short-circuit protection, pre-biased startup support, and Any Capacitor™ stability across zero-to-high-ESR output capacitors.
Technical Context
The MIC28500YJL-TR implements a digitally modified adaptive on-time control scheme that estimates tON as VOUT/VIN × 1/fSW, enabling fixed-frequency operation while retaining fast transient response. It senses current via low-side MOSFET RDS(ON) during OFF-time-eliminating external sense resistors-and uses valley-based feedback ripple detection to trigger switching cycles.
Its control loop integrates internal compensation, 6ms digital soft-start with 9.7mV steps, and foldback current limiting tied to FB voltage (e.g., 7A limit at VFB = 0V, dropping to ~4.2A at VFB = 0.8V). Thermal shutdown activates at 160°C with 25°C hysteresis, and UVLO on VDD triggers at 3.2V–4.45V with 380mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 30V to 75V - supports wide-range industrial/comms inputs including 48V telecom and 72V battery systems. |
| Output Current | Up to 4A - delivers full rated load without external current-sense components or heatsink under typical thermal conditions. |
| Feedback Accuracy | ±1% at 0.8V (−40°C to +85°C) - ensures tight regulation for low-voltage ASIC/FPGA cores. |
| Switching Frequency | 100kHz to 500kHz - adjustable via external resistor divider; enables optimization of size vs. efficiency vs. EMI. |
| Internal MOSFETs | Top RDS(ON) = 175mΩ, Bottom RDS(ON) = 31mΩ - reduces conduction loss and eliminates need for external power switches. |
| Package | 28-pin 5mm × 6mm MLF® - thermally enhanced exposed-pad QFN for PCB-level heat dissipation (θJA = 36°C/W). |
| Protection Features | Foldback current limit, hiccup-mode short-circuit, thermal shutdown, UVLO, and pre-biased startup - enables robust operation in unattended infrastructure equipment. |
Pinout & Package
28-pin 5mm × 6mm MLF® (exposed thermal pad) package with 0.5mm pitch; RoHS-compliant, Pb-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 13–19 (PVIN) | High-side MOSFET drain input | Primary HV input path (30–75V); requires local ceramic input capacitance and short PGND return. |
| 24 (EN) | Enable control input | CMOS-compatible logic enable; floating/high = on, low = shutdown (IQ ≈ 0.7mA). |
| 25 (FB) | Feedback sensing node | Regulated to 0.8V ±1%; sets output via resistor divider; bias current < ±0.5µA. |
| 26 (SGND) | Signal ground reference | Must connect directly to clean ground plane-separate from PGND to avoid noise coupling into control loop. |
| 27 (VDD) | Bias supply input | 4.5–5.5V internal bias rail; requires 2.2µF ceramic cap to PGND; must power up after or with PVIN. |
| 2,5–8,21 (PGND) | Power ground return | Low-impedance return for both MOSFET sources and input/output capacitors; forms critical high-current loop with SW and PVIN. |
| 22 (CS) | Current sense input | Monitors low-side MOSFET voltage during OFF-time for cycle-by-cycle current limiting-no external sense resistor needed. |
| 20 (BST) | Bootstrap supply output | Drives high-side gate via 0.1µF BST capacitor; Schottky diode required from VDD to BST. |
| 4,9–12 (SW) | Switch node output | Connection point between internal high-side source and low-side drain; carries full switching waveform (0V to VIN). |
| 23 (FS) | Frequency setting input | Analog voltage input (2–75V) used with resistor divider to set fSW from 100kHz to 500kHz. |
| 28 (PVDD) | Bottom MOSFET gate driver supply | Provides dedicated 4.5–5.5V rail for low-side gate drive; improves drive strength and timing control. |
| 1,3 (NC) | No-connect terminals | Not internally bonded; must remain unconnected and un-routed on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| Hyper Speed Control™ architecture | Enables stable 75V→0.8V conversion with <10µs transient recovery and reduced output capacitance (e.g., 2×22µF ceramics instead of bulk electrolytics). |
| Any Capacitor™ stability | Operates stably with zero-ESR (ceramic) to high-ESR (aluminum polymer) output capacitors-no external compensation required. |
| Internal current sensing | Uses bottom MOSFET RDS(ON) for accurate, lossless current limiting-eliminates 5–10mΩ sense resistor, saving board space and 0.5W+ dissipation. |
| Pre-biased load startup | Supports safe turn-on when output is already biased (e.g., backplane hot-swap), preventing reverse current or latch-up. |
| Thermal derating profile | Delivers full 4A up to +85°C ambient (with proper layout); derates linearly to ~2.5A at +100°C ambient per thermal curves. |
Applications
| Telecom Power Shelf | Industrial PLC I/O Module |
|---|---|
Use Scenario: Converts -48V telecom battery bus to 3.3V/5V for line-card processors and SerDes PHYs in central office equipment. IC Role / Device Role / Timing Role: Primary isolated-input DC-DC step-down regulator delivering tightly regulated, low-noise power with fast load-step response to handle bursty packet traffic. Use Value: Enables single-stage 75V→3.3V conversion without intermediate 12V bus, reducing component count by 30% and improving system efficiency by 2–3% over two-stage designs. | Use Scenario: Powers FPGA, ADCs, and isolated CAN/RS-485 transceivers in DIN-rail mounted programmable logic controllers operating from 24–72V DC field wiring. IC Role / Device Role / Timing Role: High-reliability buck controller handling wide input transients (e.g., 100V load dump) while maintaining 125°C junction operation in sealed enclosures. Use Value: Eliminates need for external TVS + LDO cascade; integrated hiccup-mode protection prevents latch-up during sustained overloads in unattended factory-floor deployments. |
| Network Router Line Card | Medical Imaging Power Subsystem |
Use Scenario: Supplies 1.2V/1.8V core voltages to multi-core network processors and DDR4 memory interfaces in 10G/25G Ethernet line cards. IC Role / Device Role / Timing Role: High-PSRR, low-noise synchronous buck regulator with precise ±1% FB accuracy and sub-100ns transient response to processor DVFS events. Use Value: Meets strict 10mVpp ripple requirement at 1.2V/4A without ferrite beads; Any Capacitor™ support allows use of compact 0805 ceramic arrays for space-constrained BGA routing. | Use Scenario: Generates isolated 5V and 3.3V rails for digital control boards in portable ultrasound and X-ray detector modules powered from 48V medical-grade batteries. IC Role / Device Role / Timing Role: Radiation-tolerant (per design heritage), low-quiescent-current buck regulator supporting cold-start from partially discharged batteries down to 30V. Use Value: Delivers >88% efficiency at 1A–4A loads across temperature (−40°C to +125°C), extending battery runtime by 18% versus legacy controllers with external sense resistors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5118MH/NOPB | Wider input range (6–100V), but requires external MOSFETs and sense resistor; no internal current sensing or pre-biased startup. | Suitable for higher-power (>10A) or ultra-wide-VIN designs where discrete FETs offer thermal flexibility. | Select LM5118MH/NOPB only if >4A output or >75V input is required; adds complexity and BOM cost versus MIC28500YJL-TR's integrated solution. |
| TPS544B20RTWR | Lower VIN range (4.5–20V), 4A rating, integrated FETs, but lacks Hyper Speed Control™ and Any Capacitor™ stability. | Optimized for server VRMs and low-VIN point-of-load; cannot operate above 20V input. | TPS544B20RTWR is not a functional substitute for MIC28500YJL-TR in 30–75V applications-use only in ≤20V systems requiring similar 4A capability. |
Compared with LM5118MH/NOPB and TPS544B20RTWR, the MIC28500YJL-TR uniquely combines 75V input tolerance, fully integrated 4A power stage, adaptive on-time control for fast transients, and capacitor-agnostic stability-making it the only drop-in solution for space-constrained 48V/72V infrastructure converters requiring <1% output accuracy and hiccup-mode fault protection.
Availability
MIC28500YJL-TR is available at Aetrix Electronics and suitable for telecom power shelves, industrial PLC I/O modules, and network router line cards requiring stable component supply with long-term lifecycle assurance.
Supply support for MIC28500YJL-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-reliability DC-DC controllers and SuperSwitcher™ power solutions.
The MIC28500YJL-TR belongs to Micrel's SuperSwitcher II™ family-engineered specifically for high-input-voltage, high-efficiency point-of-load conversion in communications infrastructure and industrial automation where input transients, thermal constraints, and board space are critical.
FAQ
What is the minimum recommended output voltage for MIC28500YJL-TR?
The MIC28500YJL-TR supports adjustable output down to 0.8V with guaranteed ±1% feedback accuracy across −40°C to +85°C. This 0.8V reference enables direct regulation of modern low-voltage ASIC, FPGA, and microprocessor cores without external amplification or level-shifting circuitry. The MIC28500YJL-TR achieves this using an internal transconductance amplifier and precision 0.8V bandgap reference, validated in production testing per datasheet specification M9999-060311-B.
Does MIC28500YJL-TR require an external current-sense resistor?
No, the MIC28500YJL-TR does not require an external current-sense resistor. It implements lossless current limiting by monitoring the voltage across the internal low-side N-channel MOSFET's RDS(ON) during OFF-time-a technique confirmed in the Functional Description section of the datasheet. This eliminates 5–10mΩ sense resistors, saving PCB area and up to 0.8W of power dissipation at 4A, while maintaining accurate foldback current limiting from 4.2A to 7A depending on FB voltage.
Can MIC28500YJL-TR safely start up into a pre-biased output?
Yes, the MIC28500YJL-TR explicitly supports safe startup into a pre-biased output, as stated in the Features list and verified in Application Information. Its control logic prevents reverse current flow during turn-on by disabling the high-side MOSFET until the FB voltage rises above the 0.8V threshold. This capability is essential for hot-swap applications in telecom and industrial backplanes where downstream circuitry may retain residual charge on bulk capacitors before the MIC28500YJL-TR is enabled.
What is the maximum allowable input voltage for MIC28500YJL-TR?
The absolute maximum PVIN-to-PGND voltage for MIC28500YJL-TR is +76V, with recommended continuous operation limited to 75V per Absolute Maximum Ratings and Operating Ratings tables. Exceeding 75V risks violating the 360ns minimum off-time constraint, potentially causing insufficient BST capacitor recharge and high-side driver failure. The MIC28500YJL-TR has been characterized for stable operation at 75V input across temperature and load, delivering up to 4A at 90% efficiency with appropriate thermal design.
How is switching frequency adjusted on MIC28500YJL-TR?
Switching frequency on the MIC28500YJL-TR is adjusted via the FS pin using an external resistor divider (R18/R19) connected between PVIN and PGND. The nominal frequency ranges from 100kHz to 500kHz, calculated as fSW = fO × R19/(R18 + R19), where fO = 500kHz when R18 = 100kΩ and R19 is open. This adjustment method is documented in Figure 5 and Equation 2 of the datasheet, and validated across process corners and temperature in Typical Characteristics plots.
MIC28500YJL-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:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 30V
- Voltage - Input (Max):
- 75V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 61.5V
- 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)
MIC28500YJL-TR FAQ
1.How can I place an order for MIC28500YJL-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC28500YJL-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 MIC28500YJL-TR reliable?
The price and inventory of MIC28500YJL-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC28500YJL-TR is usually 5 days.
3.What payment methods are accepted for MIC28500YJL-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC28500YJL-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC28500YJL-TR?
MIC28500YJL-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC28500YJL-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 MIC28500YJL-TR?
For technical support, including MIC28500YJL-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC28500YJL-TR requirements.
6.How does Aetrix verify that MIC28500YJL-TR is sourced from the original manufacturer or authorized distributors?
All MIC28500YJL-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 MIC28500YJL-TR meets industry standards.
7.What is the process for return or replacement of MIC28500YJL-TR?
All MIC28500YJL-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC28500YJL-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 MIC28500YJL-TR part is unused and in its original packaging.
Return procedure for MIC28500YJL-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MIC28500YJL-TR Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
