Monolithic Power Systems Inc. MID04W0503AGY-2R-P

Overview

MID04W0503AGY-2R-P from Monolithic Power Systems is a regulated, isolated 0.4W DC/DC converter delivering 3.3V output from a 4.5–5.5V input, featuring 1.5kVDC isolation, SOICW-16 package, and integrated MOSFET/transformer/FB circuitry. It operates across –40°C to +125°C and powers isolated bias rails for digital isolators, RS-485/CAN interfaces, and sensor front-ends in industrial automation and telecom infrastructure.

For engineers reviewing the MID04W0503AGY-2R-P datasheet, MID04W0503AGY-2R-P pinout, MID04W0503AGY-2R-P application, or MID04W0503AGY-2R-P equivalent, key selection criteria include its 0.3% load regulation, 38% full-load efficiency, UL1577 and IEC62368-1 CB certification, hiccup-mode short-circuit protection, and SOICW-16 creepage/clearance compliance (8 mm).

Technical Context

The MID04W0503AGY-2R-P implements an integrated flyback topology with on-chip power MOSFET, transformer, and optocoupler-free feedback loop enabling precise 3.3V regulation without external compensation. Its dual-ground architecture separates PGND1/SGND1 (primary side) from PGND2/SGND2 (secondary side), enforcing galvanic isolation while minimizing EMI via controlled trace routing and internal soft-start (15 ms).

It incorporates under-voltage lockout (2.61 V rising threshold, 190 mV hysteresis), thermal shutdown (160°C trip, 20°C hysteresis), and continuous hiccup-mode SCP-functions fully self-contained within the monolithic IC. Input-to-output capacitance is limited to 7 pF and resistance exceeds 50 GΩ, supporting high-noise immunity in isolated data interface applications.

Key Specifications

Pinout & Package

Delivered in a low-profile, wide-body SOICW-16 package with 8 mm minimum creepage and clearance, optimized for reinforced isolation in compact industrial PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with RECOM R1SX-0503-R and ADuM6000, the MID04W0503AGY-2R-P delivers tighter regulation (0.3 % vs. ±5 % or 0.5 %), monolithic integration (no external transformer), and built-in protections - making it optimal for space-constrained, high-reliability industrial and telecom designs requiring certified 1.5 kVDC isolation.

Availability

MID04W0503AGY-2R-P is available at Aetrix Electronics and suitable for industrial automation systems, isolated sensor power supplies, and telecom network gateways requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for MID04W0503AGY-2R-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, with over two decades of innovation in DC/DC conversion, motor drivers, and LED lighting controllers.

The MID series targets compact, certified isolated power solutions for industrial and communications equipment - designed to replace discrete flyback circuits with monolithic, safety-certified alternatives that reduce design time and improve reliability.

FAQ

What is the maximum continuous output current supported by the MID04W0503AGY-2R-P?

The device supports up to 120 mA continuous output current at 3.3 V, corresponding to its rated 0.4 W output power. This is validated across the full –40°C to +125°C temperature range with ≤0.3 % load regulation and ≤100 mV peak-to-peak ripple under all operating conditions.

Does the MID04W0503AGY-2R-P require external feedback components or compensation networks?

No. The device integrates a complete feedback control loop-including internal voltage reference, error amplifier, and isolation-coupled sensing-eliminating the need for external optocouplers, TL431s, or compensation capacitors. Only input and output decoupling capacitors are required.

Can the MID04W0503AGY-2R-P be used with input voltages below 4.5 V?

No. The under-voltage lockout (UVLO) rising threshold is 2.61 V, but the device requires ≥4.5 V to sustain regulation and deliver rated output power. Operation below 4.5 V results in undefined behavior, reduced efficiency, and potential dropout; it is outside the guaranteed operating range.

How is isolation verified for the MID04W0503AGY-2R-P during production testing?

Every unit undergoes 100 % production isolation testing at 1.2 × 1.5 kVDC (1.8 kVDC) for 1 second. Qualification testing applies 1.5 kVDC for 60 seconds per UL1577 and IEC62368-1 standards. Input-to-output resistance exceeds 50 GΩ and capacitance remains ≤7 pF, confirmed per datasheet test conditions.

What PCB layout practices are mandatory to meet CISPR32 Class B emissions?

To achieve Class B compliance, implement the recommended 4-layer stackup with overlapping mid-layer planes forming a low-ESL Y-capacitor, place ferrite beads (BLM18HE102) in CLC filter configuration adjacent to VOUT/PGND2, and route SGND2–PGND2 via thin traces only-never wide copper pours-to suppress common-mode radiation.

Is thermal derating required above 25°C ambient temperature?

Yes. With θJA = 48 °C/W (SOICW-16), the device dissipates up to 2.65 W at 25°C ambient, but usable output power decreases linearly with ambient rise. At 85°C ambient, maximum continuous output power drops to ~0.28 W to maintain TJ ≤125°C; refer to Figure 5 in the datasheet for exact derating curves.

Does the MID04W0503AGY-2R-P support adjustable output voltage?

No. The output is fixed at 3.3 V and internally trimmed during wafer sort. There is no external resistor divider or feedback pin to modify the output voltage; attempting to do so will result in loss of regulation and potential damage due to violation of internal reference constraints.