Monolithic Power Systems Inc. MID06W0503AGY-3S-P

Overview

MID06W0503AGY-3S-P from Monolithic Power Systems is a semi-regulated, isolated DC/DC converter delivering 3.3V at up to 180mA (0.6W) from a 4.5–5.5V input, featuring 3kVDC isolation, -40°C to +125°C operation, and integrated MOSFET/transformer/FB circuit in SOICW-16. It serves as bias power for isolated interfaces including RS-485, CAN, and digital isolators in industrial automation and telecom infrastructure.

For engineers reviewing the MID06W0503AGY-3S-P datasheet, MID06W0503AGY-3S-P pinout, MID06W0503AGY-3S-P application, or MID06W0503AGY-3S-P equivalent, key selection criteria include verified 3kVDC isolation rating, semi-regulated 3.3V output accuracy (±0.4% typical), load/line regulation performance, thermal shutdown behavior at 160°C, and SOICW-16 layout constraints for creepage/clearance compliance.

Technical Context

This device implements transformer-coupled flyback topology with internal primary-side switching and secondary-side feedback via integrated optocoupler-equivalent sensing. Regulation is achieved through duty-cycle modulation based on sampled VOUT, resulting in semi-regulated performance-tighter than unregulated converters but looser than fully regulated DC/DCs under corner conditions (e.g., 4.5V VIN, 180mA load, 80°C ambient).

It integrates protection logic for hiccup-mode short-circuit response (150ms off-time), over-temperature shutdown (160°C trip, 20°C hysteresis), and under-voltage lockout (2.61V rising threshold). EMI suppression relies on PCB-level Y-capacitance formation between mid-layers and CLC filtering with ferrite beads, not internal compensation.

Key Specifications

Pinout & Package

Package: SOICW-16 (wide-body, 10.3mm × 10.3mm × 2.65mm), JEDEC MS-013 AA compliant, MSL Level 3. Designed for high creepage/clearance: minimum 8mm external air gap and tracking distance between primary and secondary sides.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar isolated DC/DC converter applications.

Compared with RECOM R1SX-0503-R, MID06W0503AGY-3S-P offers superior regulation and 3kVDC isolation but at lower efficiency; versus ADuM6000, it trades full regulation for wider input range and higher temperature capability, making it optimal for ruggedized 5V-rail industrial designs.

Availability

MID06W0503AGY-3S-P is available at Aetrix Electronics and suitable for industrial automation systems, isolated sensor power supplies, and telecom network gateways requiring stable component supply with guaranteed long-term continuity and full traceability.

Supply support for MID06W0503AGY-3S-P 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

Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance power management ICs, founded in 1997 and headquartered in Kirkland, Washington.

This part belongs to MPS's MID series of integrated isolated DC/DC converters, designed specifically to replace discrete transformer-based solutions in space-constrained, high-reliability industrial and telecom applications where safety certification and thermal robustness are critical.

FAQ

What is the difference between MID06W0503AGY-2S and MID06W0503AGY-3S?

The sole functional difference is isolation voltage rating: MID06W0503AGY-2S is rated for 1.5kVDC isolation, while MID06W0503AGY-3S is rated for 3kVDC. Both share identical electrical specifications, package, pinout, and thermal performance. The -3S variant meets stricter safety standards required for reinforced insulation in industrial mains-connected equipment.

Does MID06W0503AGY-3S-P require external feedback components?

No. The device integrates all feedback circuitry-including error amplifier, reference, and isolation coupling-within the SOICW-16 package. No external resistors, capacitors, or optocouplers are needed for regulation or isolation; only input/output decoupling capacitors (10μF + 0.1μF each side) are required per the datasheet.

Can this converter operate at full load across its entire temperature range?

Yes, it is fully specified for 0.6W continuous output from -40°C to +125°C ambient. Thermal shutdown activates at 160°C junction temperature, and the SOICW-16 package's θJA of 48°C/W allows safe operation at full load with minimal copper area on a 2-layer board, provided PGND1/SGND1 are properly implemented per layout guidelines.

Why does the datasheet specify "semi-regulated" instead of "regulated"?

"Semi-regulated" reflects its output voltage accuracy: ±0.4% typical under nominal conditions, but up to ±5% under worst-case corners (e.g., 4.5V input, 180mA load, 80°C ambient). This is tighter than unregulated converters but looser than fully regulated devices-sufficient for most isolated interface biasing, but not for precision analog references.

How is EMI performance achieved without internal spread-spectrum or active filtering?

EMI compliance (CISPR32 Class B) is achieved through PCB-level design: overlapping mid-layer copper forms an intrinsic Y-capacitor, and external ferrite beads + capacitors create a CLC filter. The IC's fixed-frequency operation (not spread-spectrum) is compensated by these board-level techniques, which are mandatory per the recommended layout in Figure 2 and Figure 3.

Is there a recommended evaluation board for this part?

Yes-the EV06W0503A-3-Y-00A evaluation board is documented in the datasheet (page 4) and optimized for thermal and EMI performance. It uses a 51mm×51mm, 2-layer, 1oz copper PCB with specific layer stackup to realize the Y-capacitance technique and validate the CLC filter implementation before custom board design.

What is the minimum recommended output capacitance for stable operation?

The datasheet specifies ≥4.7μF for the capacitor closest to VOUT (C2B in Figure 2) to ensure stability under dynamic load. Total output capacitance should be ≥10μF (plus 0.1μF ceramic) to meet ripple (<100mV) and transient response requirements. Using less than 4.7μF risks instability and excessive overshoot during load steps.