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MIC38HC45YM
Microchip Technology
IC REG CTRLR MULT TOPOLOGY 8SOIC
3317 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
- (426 Ratings)
MIC38HC45YM
Product Overview
1348346
DiGi Electronics Part Number
MIC38HC45YM-DGManufacturer
Microchip Technology
MIC38HC45YM
Description
IC REG CTRLR MULT TOPOLOGY 8SOICInventory
3317 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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MIC38HC45YM Technical Specifications
Category
Power Management (PMIC), DC DC Switching Controllers
Packaging
Tube
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
-
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
MIC38HC45
Datasheet & Documents
HTML Datasheet
MIC38HC45YM-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
576-1519-5
MIC38HC45YM-DG
Standard Package
95
Alternative Parts
PART NUMBER
MANUFACTURER
QUANTITY AVAILABLE
DiGi PART NUMBER
UNIT PRICE
SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
포장 덕분에 제품이 깨끗하고 손상 없이 도착했어요.
de desembre 02, 2025
我很欣賞他們的價格優勢和平時準時的出貨速度，讓我成為回頭客！
de desembre 02, 2025
物流速度超快，收到商品時完全沒有延遲，滿意至極。
de desembre 02, 2025
J'apprécie la rapidité de la livraison et la façon dont tout est organisé de manière responsable en matière d'environnement.
de desembre 02, 2025
Their team is always approachable and ready to assist, which boosts my confidence in shopping with them.
de desembre 02, 2025
Their support staff follow up diligently to ensure issues are resolved promptly.
de desembre 02, 2025
I trust DiGi Electronics for affordable and reliable electronics.
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Frequently Asked Questions (FAQ)
When designing in the MIC38HC45YM for a high-reliability industrial power supply, what are the key risks related to input voltage regulation and how can they be mitigated?
The MIC38HC45YM requires a stable Vcc supply between 7.6V and 20V, but it does not include an internal LDO, so improper biasing can lead to erratic switching or lockout during startup. A common design risk is relying on an unregulated auxiliary source. To mitigate this, use a low-dropout regulator (e.g., TPS7A4501) to generate a clean 12V or 15V bias rail from the main input. Additionally, ensure the Vcc bypass capacitor (≥1μF X7R, low-ESR) is placed within 5mm of the Vcc pin to handle transient current spikes from the gate driver. This prevents UVLO glitches in harsh environments with noisy inputs up to 40V systems when used with a pre-regulator.
Can the MIC38HC45YM safely replace the UC3845 in an existing forward converter design, and what critical differences should engineers validate?
Yes, the MIC38HC45YM is a suitable drop-in alternative to the UC3845 in most forward and flyback topologies, but key differences must be verified. First, the MIC38HC45YM has a maximum duty cycle limited to 50%, making it unsuitable for boost or flyback converters requiring >50% duty in high step-up ratios—unlike the UC3845 which supports up to 98%. Second, the MIC38HC45YM features built-in synchronous rectifier control, which can reduce losses but may require gate drive isolation if retrofitting non-synchronous designs. Validate timing with the RT/CT pin components, as oscillator characteristics may vary slightly, impacting EMI performance in legacy layouts.
What are the thermal and drive-strength limitations of the MIC38HC45YM's output stage when driving large MOSFET gates in a 100kHz flyback converter?
The MIC38HC45YM integrates a high-current totem-pole driver capable of peak currents up to 1A, suitable for driving gates of MOSFETs like the IRF740 in flyback converters up to 100kHz. However, at high switching frequencies or with large Qg devices (>50nC), power dissipation in the driver stage increases. For reliable operation, limit total gate charge driven per cycle to below 100nC and ensure PCB copper pour on the GATE pin trace acts as a heat spreader. Use a series gate resistor (10–22Ω) to damp ringing and reduce instantaneous driver stress. In enclosed industrial environments near 85°C, derate by 20% or add a small heat sink if driving multiple paralleled FETs.
How does the isolation capability of the MIC38HC45YM affect transformer design when implementing a forward converter for medical-grade power supplies?
The MIC38HC45YM’s isolation-capable output control enables its use in isolated forward converters meeting stringent medical safety standards (e.g., IEC 60601). However, because the IC controls the primary-side switch directly, isolation must be implemented on the feedback path via an optocoupler (e.g., IL300) or shunt regulator (TL431). Ensure transformer design includes sufficient creepage (≥6mm) and reinforced insulation between primary and secondary. Use a tightly regulated auxiliary winding or bias supply referenced to secondary ground for feedback accuracy. The absence of built-in slope compensation also requires external ramp injection when current mode control is used with duty cycles above 50% to prevent subharmonic oscillation.
In a dual-purpose step-up/step-down application using the MIC38HC45YM, what design trade-offs arise due to its fixed 50% maximum duty cycle limit?
The 50% maximum duty cycle limitation of the MIC38HC45YM constrains its use in high step-up (boost) or non-synchronous buck-boost configurations where input voltage can dip below the output. For example, in a 12V output system with input ranging from 6V to 16V, the boost section may fail to regulate when Vin drops below ~10V due to insufficient on-time. To work around this, consider using a Cuk or SEPIC topology, which can handle wide input ranges within 50% duty cycle limits. Alternatively, reconfigure the system to use a two-stage approach—pre-regulate with a buck stage followed by isolation or output regulation. Always simulate the worst-case duty cycle with actual transformer turns ratio or inductor ripple before final layout.
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MIC38HC45YM CAD Models
Microchip Technology MIC38HC45YM PCB symbols & footprints
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