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MIC38C45YM-TR
Microchip Technology
IC REG CTRLR MULT TOPOLOGY 8SOIC
2036 Pcs New Original In Stock
Buck, Boost, Flyback, Forward Converter Regulator Positive, Isolation Capable Output Step-Up, Step-Down, Step-Up/Step-Down DC-DC Controller IC 8-SOIC
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5.0 / 5.0
- (78 Ratings)
MIC38C45YM-TR
Product Overview
1320049
DiGi Electronics Part Number
MIC38C45YM-TR-DGManufacturer
Microchip Technology
MIC38C45YM-TR
Description
IC REG CTRLR MULT TOPOLOGY 8SOICInventory
2036 Pcs New Original In Stock
Buck, Boost, Flyback, Forward Converter Regulator Positive, Isolation Capable Output Step-Up, Step-Down, Step-Up/Step-Down DC-DC Controller IC 8-SOIC
CAD Models - PCB Symbols & Footprints
Quantity
Minimum 1
Minimum 1
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MIC38C45YM-TR Technical Specifications
Category
Power Management (PMIC), DC DC Switching Controllers
Packaging
Tape & Reel (TR)
Series
-
Product Status
Active
Output Type
Transistor Driver
Function
Step-Up, Step-Down, Step-Up/Step-Down
Output Configuration
Positive, Isolation Capable
Topology
Buck, Boost, Flyback, Forward Converter
Number of Outputs
1
Output Phases
1
Voltage - Supply (Vcc/Vdd)
7.6V ~ 20V
Frequency - Switching
500kHz
Duty Cycle (Max)
50%
Synchronous Rectifier
Yes
Clock Sync
No
Serial Interfaces
-
Control Features
Frequency Control
Operating Temperature
-40°C ~ 85°C (TA)
Mounting Type
Surface Mount
Package / Case
8-SOIC (0.154", 3.90mm Width)
Supplier Device Package
8-SOIC
Base Product Number
MIC38C45
Datasheet & Documents
HTML Datasheet
MIC38C45YM-TR-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
MIC38C45YM TR
MIC38C45YM-CT
MIC38C45YM-DKR
MIC38C45YM TR-DG
MIC38C45YMTR
MIC38C45YMTR-DG
Standard Package
2,500
Alternative Parts
PART NUMBER
MANUFACTURER
QUANTITY AVAILABLE
DiGi PART NUMBER
UNIT PRICE
SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
포장 상태가 일관되게 좋아서 언제나 믿고 주문할 수 있어요. 배송 추적도 정확하고 빠르게 확인 가능했습니다.
Dec 02, 2025
제품 상담을 받았을 때 친절한 설명에 감탄했어요.
Dec 02, 2025
とても手頃な価格で、エコな包みに心が和みます。
Dec 02, 2025
I trust DiGi Electronics for consistent, high-quality products at a reasonable price.
Dec 02, 2025
Fast shipping combined with friendly support made this a top-notch experience.
Dec 02, 2025
Their product reliability has helped improve my workflow significantly.
Dec 02, 2025
Whenever I have a question, their expert team responds swiftly and knowledgeably, which I greatly appreciate.
Dec 02, 2025
The quality of their products exceeds my expectations every time.
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Frequently Asked Questions (FAQ)
What are the key design-in risks when using the MIC38C45YM-TR in a high-noise industrial environment with wide input voltage transients?
When integrating the MIC38C45YM-TR in noisy industrial settings, a primary risk is instability from supply rail fluctuations due to its 7.6V to 20V Vcc range. Ensure the bias supply is well-decoupled with low-ESR ceramic capacitors near the Vcc and GND pins to prevent latch-up or UVLO triggering. Also, since the MIC38C45YM-TR lacks clock synchronization, EMI can peak at 500kHz; spread-spectrum filtering or shielding may be necessary in sensitive systems. Designers should validate startup behavior under cold-crank-like dips, especially in automotive or ruggedized power systems where brownout conditions could exceed the controller’s minimum operating voltage before the main converter stabilizes.
Can the MIC38C45YM-TR replace the UC3845 in an existing flyback design, and what layout adjustments are required?
Yes, the MIC38C45YM-TR is a drop-in compatible alternative to the UC3845 in most flyback and forward topologies, offering similar peak-current-mode control and 500kHz switching. However, verify that the gate drive strength (2A source/sink) of the MIC38C45YM-TR matches or exceeds the UC3845 variant in use, especially when driving larger MOSFETs. A critical layout consideration is minimizing the gate loop inductor path to avoid ringing that can cause shoot-through. Also, confirm the current sense resistor and compensation network are recalibrated—due to potential minor differences in internal reference and propagation delay—to prevent subharmonic oscillation or overcurrent false tripping. Always review PCB creepage and clearance if operating near the isolation boundary in offline designs.
How does the 50% maximum duty cycle of the MIC38C45YM-TR limit its use in high-step-down buck-boost applications, and what topologies are affected?
The 50% max duty cycle in the MIC38C45YM-TR restricts its use in standard buck-boost or SEPIC topologies where input voltage dips below the output require >50% duty cycles. For example, in a 12V output system with input dropping to 6V, the duty cycle would need to exceed 50%, which the MIC38C45YM-TR cannot support. Instead, consider using it in flyback or isolated forward converters where transformer turns ratio compensates for the limitation. Alternatively, reconfigure the power stage to a two-switch forward converter with synchronous rectification to stay within the 50% boundary while maintaining isolation and efficiency. Always verify worst-case transient response using the frequency compensation pin to avoid instability during line/load steps.
What reliability concerns should be addressed when operating the MIC38C45YM-TR near the upper end of its 85°C ambient temperature rating?
Operating the MIC38C45YM-TR at elevated ambient temperatures (near 85°C) demands careful thermal management despite its MSL-1 rating and robust SOIC package. The internal driver and control circuitry can experience accelerated aging under sustained thermal stress, especially if PCB copper heatsinking is insufficient. To mitigate risk, ensure at least 2 oz copper planes on both power and ground layers with multiple thermal vias under the exposed pad (if present), though the 8-SOIC package has limited thermal pad access. Additionally, derate external components—especially the bootstrap diode and output capacitor—for lifetime at temperature. Monitor feedback network accuracy, as resistor drift at high temperature can lead to output overvoltage faults in critical loads.
How does the absence of clock synchronization in the MIC38C45YM-TR impact EMI performance in multi-rail power systems?
The lack of clock synchronization in the MIC38C45YM-TR means multiple converters using this controller will operate asynchronously, increasing the risk of beat frequencies and conducted EMI spikes across the 400–600kHz range. In multi-rail systems where several MIC38C45YM-TR ICs are used (e.g., distributed point-of-load supplies), this can overload common input filters. To mitigate, stagger switching frequencies by adjusting the timing resistor or use input LC filters with damping on each rail. Alternatively, choose a synchronized controller like the LM5025 for critical noise-sensitive applications. However, for single-rail or cost-sensitive designs, the simplicity and reliability of the MIC38C45YM-TR often outweigh the EMI trade-off—provided proper layout and shielding are implemented.
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
MIC38C45YM-TR CAD Models
Microchip Technology MIC38C45YM-TR PCB symbols & footprints
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