Monolithic Power Systems Inc. MP100GN-Z

Overview

MP100GN-Z from Monolithic Power Systems is an offline, inductor-less AC/DC regulator IC designed for low-power bias supply in off-line applications. It accepts universal AC input (85–305 V_AC), delivers adjustable DC output (1.5–15 V), integrates a 700 V-rated input switch, and provides power-good signaling with thermal, over-current, and short-circuit protection - enabling compact, capacitor-only power supplies for wireless control nodes.

For engineers reviewing the MP100GN-Z datasheet, MP100GN-Z pinout, MP100GN-Z application, or MP100GN-Z equivalent, key selection criteria include its 12 V typical regulated output at 40 mA, 160 °C thermal shutdown threshold, SOIC8E package with exposed pad, and smart charging window control that eliminates inductors while meeting standby power requirements.

Technical Context

The MP100 employs a proprietary smart-control architecture that charges the VD energy-storage capacitor only during low-voltage windows of the rectified AC line (e.g., below 35 V), minimizing conduction loss and enabling high efficiency without magnetic components. Its internal LDO stage regulates output voltage using feedback from the FB pin referenced to 1.235 V.

Operation relies on dual-threshold VIN detection (fast: 32–38 V; slow: 27–32 V) and active bleeder circuitry triggered when VD falls below 14 V, ensuring reliable restart after shutdown and stable energy delivery across full AC cycles. Protection logic includes VD over-voltage lockout (32.5 V max), VD under-voltage lockout (6.3–7.4 V), and auto-recovery over-current and short-circuit response.

Key Specifications

Pinout & Package

MP100GN-Z is housed in a thermally enhanced SOIC8E package with exposed pad (non-electrical, connected to GND for heat dissipation). Pin 7 is NC; exposed pad must be soldered to large copper area tied to GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP101GN-Z, MP100GN-Z offers lower cost and simpler layout but reduced VD headroom; versus LNK304DG, it eliminates magnetics and reduces component count at the expense of peak output capability and regulation precision.

Availability

MP100GN-Z is available at Aetrix Electronics and suitable for wall-switch integration, ZigBee/Z-Wave power conversion, and standby bias supply applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for MP100GN-Z 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 focus on efficiency, integration, and reliability across consumer, industrial, and automotive markets.

The MP100 belongs to MPS's offline AC/DC regulator product line, engineered specifically to replace transformer-based or capacitive-dropper supplies in ultra-low-power, space-constrained applications where inductor elimination is critical.

FAQ

What is the minimum VD capacitor value required for stable 12 V/10 mA operation?

A 220 μF/35 V aluminum electrolytic capacitor with parallel 470 pF ceramic is specified in the typical application circuit. This combination ensures sufficient energy storage across the AC cycle and suppresses ripple-induced instability. Smaller values risk VD droop below 6.8 V under load, triggering LDO shutdown.

Can MP100GN-Z operate with half-wave rectification?

Yes - the datasheet confirms compatibility with both half-wave and full-bridge rectifiers. However, half-wave operation reduces maximum output power by ~50% at the same VIN and requires larger VD capacitance to maintain hold-up time, as shown in Figure 2's performance curves.

How does the active bleeder circuit affect startup behavior?

The active bleeder pulls VIN low when VD falls below 14 V, forcing the input into the charging window to recharge VD. During cold startup, this ensures repeated attempts to reach the 15.3 V VD threshold needed to enable the LDO, even with high parasitic capacitance on the AC line.

Is PG pin compatible with 3.3 V logic systems?

Yes - PG is open-drain and rated for ≤14 V, so it can be pulled up to 3.3 V with a standard 10 kΩ resistor. The 200 μs delay and 80% VOUT threshold ensure clean assertion timing for 3.3 V microcontrollers without additional level-shifting.

What thermal derating applies above 25 °C ambient?

SOIC8E θ_JA is 50 °C/W. At 75 °C ambient, maximum continuous power drops to (150 °C − 75 °C)/50 = 1.5 W - well above typical dissipation (<0.5 W at 10 mA), but PCB copper area and airflow must be verified per Figure 4 layout guidelines.

Does MP100GN-Z require an X-capacitor for EMI compliance?

Yes - the datasheet mandates an X-capacitor (e.g., 0.22–1 μF depending on application) between line and neutral before the rectifier to suppress differential-mode noise and pass conducted EMI tests, especially with isolation transformers or variable AC sources.

Can multiple MP100GN-Z devices be paralleled for higher output current?

Yes - Figure 6 shows direct paralleling with shared VD and VIN connections. Output current scales linearly (e.g., two units deliver ~200 mA), but ensure matched VD capacitor values and identical feedback networks to avoid current imbalance and thermal runaway.