Monolithic Power Systems Inc. MP100GN

Overview

MP100GN from Monolithic Power Systems is an offline, inductor-less AC/DC regulator IC designed for low-power bias supply generation directly from universal AC mains (85–305 VAC). It integrates a smart charging window control, 12 V regulated LDO output (±1% reference), 120–270 mA current limit, and power-good signaling. It delivers stable DC bias to wireless controllers in wall switches and ZigBee/Z-Wave modules without bulk capacitors or inductors.

For engineers reviewing the MP100GN datasheet, MP100GN pinout, MP100GN application, or MP100GN equivalent, this device serves as a compact, thermally protected, capacitor-input AC/DC solution optimized for <500 mW standby power systems requiring high input voltage tolerance, adjustable output (1.5–15 V), and integrated fault protection including over-current, short-circuit, VD over-voltage, and thermal shutdown.

Technical Context

The MP100GN employs a proprietary smart-control architecture that activates its internal high-voltage switch only during low-voltage portions of the AC cycle (charging window <35 V), minimizing conduction loss and enabling >70% efficiency at light loads. Its two-stage operation-capacitive energy storage on VD followed by LDO regulation on VOUT-decouples input transients from output stability.

It features dual-threshold UVLO (fast/slow) with hysteresis for robust startup under varying line conditions, active bleeder circuitry to ensure reliable restart after shutdown, and precise 1.235 V feedback reference with ±0.031 V tolerance enabling accurate output setting via external resistive divider.

Key Specifications

Pinout & Package

The MP100GN is housed in an SOIC8E package with exposed thermal pad (non-connected, recommended to tie to GND copper pour).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar offline inductor-less regulator applications.

Compared with MP100GN, MP101GN offers higher current headroom for burst-mode loads while maintaining identical protection and thermal behavior; TSM103WIDT trades flexibility and system integration for lower unit cost but cannot support adjustable outputs or power sequencing.

Availability

MP100GN is available at Aetrix Electronics and suitable for wall switch retrofits, wireless sensor nodes, and standby power supplies requiring stable component supply, RoHS-compliant packaging, and long-term industrial lifecycle support.

Supply support for MP100GN 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 analog and power ICs, with design centers in the US, China, and Taiwan.

The MP100 product line targets ultra-low-power, capacitor-input AC/DC conversion for smart home and IoT edge devices, emphasizing minimal external components, wide input range, and regulatory-compliant standby efficiency.

FAQ

What is the maximum output power achievable with MP100GN at 230 VAC input?

At 230 VAC full-bridge rectified input, MP100GN delivers up to 400 mW at 12 V output with 220 μF VD capacitance and <60 °C temperature rise on standard PCB. Output power scales with VD capacitor size and rectifier type-half-wave configurations reduce max power by ~40% due to longer charging intervals.

Can MP100GN operate without an external VD capacitor?

No. The VD capacitor (minimum 220 μF/35 V) is mandatory for energy storage and LDO stage operation. Without it, the device cannot sustain output voltage beyond initial charge, triggering immediate VD undervoltage lockout and thermal shutdown within milliseconds.

How does the active bleeder circuit improve system reliability?

The active bleeder pulls VIN low when VD drops below 14 V, forcing re-entry into the charging window. This prevents "latch-up" during brownout or high-temperature conditions and ensures rapid restart after AC interruption-critical for self-powered wireless switches that must respond within 100 ms of power restoration.

Is MP100GN compatible with MOV-based surge protection?

Yes. MP100GN's integrated 750 V switch allows direct use with standard 1 kV MOVs (e.g., 14 mm diameter, 275 VAC rating) across AC input lines. With proper MOV selection and layout, the device passes IEC 61000-4-5 Level 3 (1 kV differential mode) surge testing without external clamping diodes.

What is the minimum recommended FB resistor value for output voltage adjustment?

The lower feedback resistor (RLW) should be ≥10.2 kΩ to avoid excessive current draw and maintain regulation accuracy. Using RLW <5 kΩ increases ground pin current error and degrades load regulation beyond 0.08%, violating datasheet-specified performance.

Does MP100GN require heatsinking in SOIC8E package?

Not typically. At 400 mW output and 2.5 W max dissipation, the SOIC8E's θJA = 50 °C/W yields ~20 °C rise above ambient on 2-layer boards with 1 cm² GND copper. Heatsinking is only needed for >600 mW continuous operation or ambient >85 °C environments.

How does the PG pin behave during thermal shutdown?

During thermal shutdown, PG goes low immediately upon LDO disable and remains low until VOUT recovers to 80% of target after cooldown. The 200 μs delay is re-applied on each valid restart, ensuring clean system reset coordination without chatter.