MIC28500YJL Microchip Integrated Circuit (Other) In Stock
MIC28500YJL is a high-voltage synchronous buck switching regulator from Microchip Technology, accepting 30 V to 75 V input and delivering up to 9 A peak (4 A continuous rated) at an adjustable output voltage from 0.8 V upward in a 28-pin PowerVQFN package. It targets 48 V bus step-down conversion for telecom equipment, networking gear, and industrial power modules. The device integrates both power switches and gate drivers, reducing external component count for compact, high-efficiency DC-DC designs.
- Manufacturer
- Microchip
- Package
- Other
- Pin Count
- 31
- Lifecycle
- ACTIVE
- Datasheet
- MIC28500YJL Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 30 V to 75 V input range supports 48 V telecom bus and industrial DC distribution rails with wide transient headroom
- Adjustable output voltage from 0.8 V enables powering FPGAs, ASICs, and multi-rail DSP cores from a single inductor stage
- 9 A peak switch current with integrated high-side and low-side FETs eliminates external power MOSFETs and gate drivers
- 28-pin PowerVQFN package with exposed thermal pad achieves low RθJA for high-efficiency, low-profile power module designs
- Cycle-by-cycle current limiting and thermal shutdown provide robust protection in fault conditions without external circuitry
Applications
The MIC28500YJL is optimized for 48 V to point-of-load conversion in telecom central-office equipment, data center server blades, and network switches where a single IC must step down a 48 V bus rail to 1 V to 3.3 V logic supply rails at up to 9 A peak. Its wide 30 V to 75 V input range also accommodates 60 V industrial DC distribution busses in factory automation and programmable logic controller (PLC) power supplies. Designers in LED lighting drivers and battery-powered industrial robots use the adjustable 0.8 V reference to generate precise output rails for SoC and DDR memory power sequencing.
Specifications
| Additional Feature | ADJUSTABLE OUTPUT VOLTAGE DOWN TO 0.8V |
| Analog IC - Other Type | SWITCHING REGULATOR |
| Input Voltage-Max | 75V |
| Input Voltage-Min | 30V |
| Input Voltage-Nom | 48V |
| JESD-30 Code | R-XQCC-N28 |
| JESD-609 Code | e4 |
| Number of Functions | 1 |
| Output Current-Max | 9A |
| Package Body Material | UNSPECIFIED |
| Package Shape | RECTANGULAR |
| Package Style | CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE |
| Surface Mount | YES |
| Switcher Configuration | BUCK |
| Switching Frequency-Max | 625kHz |
| Temperature Grade | AUTOMOTIVE |
| Terminal Finish | Nickel/Palladium/Gold (Ni/Pd/Au) |
| Terminal Form | NO LEAD |
| Terminal Pitch | 0.65mm |
| Terminal Position | QUAD |
| Package | Other |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
| Country of Origin | Thailand |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for MIC28500YJL:
Frequently Asked Questions
What input voltage range does the MIC28500YJL support, and how does it handle 48 V telecom bus transients?
The MIC28500YJL operates from 30 V to 75 V input, with an absolute maximum rating above 75 V providing margin for load-dump transients on 48 V telecom rails that can spike to 60 V or higher. The 75 V maximum covers the ETSI EN 300 132-2 telecom bus range of -40.5 V to -72 V (negative ground convention), equivalent to 40.5 V to 72 V positive bus, which falls within the device's rated range. Integrated bootstrap circuitry drives the high-side switch gate even at 75 V input without requiring an external charge pump.
How low can the MIC28500YJL regulate its output voltage, and what sets the minimum programmable output?
The MIC28500YJL can regulate its output down to 0.8 V, which is set by the internal feedback reference voltage. The output voltage is programmed by a resistor divider connecting the output to the FB pin and GND; for example, to achieve 1.0 V from a 48 V input, resistors of approximately 33 kΩ and 26.4 kΩ around the 0.8 V reference set the output. This 0.8 V minimum enables powering modern FPGA core rails and DDR4 VDDQ at 1.2 V directly from a 48 V bus in a single-stage conversion.
For a 48 V to 3.3 V, 6 A continuous conversion with MIC28500YJL, what inductor value and switching frequency are recommended?
At 48 V input, 3.3 V output, and 6 A load with 30% inductor current ripple, a switching frequency of 400 kHz yields an inductor value of approximately L = (Vin - Vout) × Vout / (Vin × fs × ΔIL) = (48 - 3.3) × 3.3 / (48 × 400000 × 1.8) ≈ 5.4 µH. A 5.6 µH, 10 A rated inductor with DCR below 10 mΩ maintains efficiency above 90%. The MIC28500YJL's programmable switching frequency range (typically 200 kHz to 1 MHz) allows the designer to trade off inductor size, switching losses, and output ripple across the 30 V to 75 V input range.
How does the MIC28500YJL's integrated FET design reduce BOM complexity compared to a controller-plus-FET approach?
A discrete 48 V buck controller solution requires at least 2 external power MOSFETs (rated ≥100 V, 10 A), 2 gate-driver bootstrap capacitors, and a bootstrap diode—adding 5 or more components and requiring careful high-frequency layout to minimize gate-drive loop inductance. The MIC28500YJL integrates all these elements into the 28-pin PowerVQFN package, reducing the active component count by 5 and eliminating the parasitic inductance of external gate-drive connections. This integration also lowers the total PCB area by approximately 30% to 40% compared to a comparable discrete solution.
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