Monolithic Power Systems Inc. MP20042DG-DD-LF-Z

Overview

MP20042DG-DD-LF-Z from Monolithic Power Systems is a dual-channel, low-noise, high-PSRR linear regulator delivering two independent 1.85V outputs at up to 200mA per channel, with 1% output accuracy, 11μVRMS noise, and 72dB PSRR at 1kHz-designed for battery-powered wireless LAN and handheld devices requiring stable dual-rail low-voltage supply.

For engineers reviewing the MP20042DG-DD-LF-Z datasheet, MP20042DG-DD-LF-Z pinout, MP20042DG-DD-LF-Z application, or MP20042DG-DD-LF-Z equivalent, key selection criteria include dual enable control, ultra-low quiescent current (114μA), thermal shutdown at 140°C, dropout of 110mV at 100mA, and QFN8 (2mm × 2mm) package compatibility with space-constrained PCB layouts.

Technical Context

The MP20042DG-DD-LF-Z integrates two independent PMOS-based LDOs with separate EN1/EN2 pins enabling asynchronous channel control and near-zero shutdown current (≤1μA). Each regulator features internal current limiting (450mA trip), thermal shutdown with 10°C hysteresis, and operates across 2.5V–6.0V input while maintaining 1.85V ±1% output accuracy.

Its architecture delivers fast transient response using small ceramic output capacitors (0.47–10μF, ESR <1.2Ω), supported by low 110mV dropout at 100mA and high AC PSRR (72dB @1kHz, 47dB @100kHz), making it suitable for noise-sensitive RF and mixed-signal subsystems where supply rail isolation and stability are critical.

Key Specifications

Pinout & Package

MP20042DG-DD-LF-Z uses a thermally enhanced 2mm × 2mm QFN8 package with exposed thermal pad (JEDEC MO-229 VCCD-3 compliant). Pin 1 is marked by a top-side index area; the exposed paddle must be soldered to a PCB ground plane for optimal thermal performance (θJA = 80°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-output LDO applications.

Compared with XC6223D182MR-G and RT9013-18GQW, MP20042DG-DD-LF-Z uniquely provides matched dual 1.85V outputs, independent enable control, and industry-leading 11μVRMS noise in a single 2mm × 2mm footprint-enabling higher integration, lower system noise, and longer battery life.

Availability

MP20042DG-DD-LF-Z is available at Aetrix Electronics and suitable for wireless LAN modules, battery-powered IoT sensors, and handheld medical devices requiring stable component supply, RoHS-compliant packaging, and tape-and-reel delivery for automated assembly.

Supply support for MP20042DG-DD-LF-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 expertise in DC/DC converters, LDOs, LED drivers, and motor drivers since 1997.

The MP20042 belongs to MPS's low-noise, micropower LDO product line, engineered specifically for battery-operated portable electronics demanding ultra-low quiescent current, high PSRR, and minimal board space.

FAQ

What is the maximum allowable input voltage for MP20042DG-DD-LF-Z?

The absolute maximum input voltage is 6.5V, but the recommended operating range is 2.5V to 6.0V. Exceeding 6.5V risks permanent damage due to internal overvoltage stress on the PMOS pass elements and bandgap reference circuitry. Operation above 6.0V voids guaranteed specifications including PSRR, dropout, and thermal shutdown accuracy.

Can MP20042DG-DD-LF-Z operate with ceramic output capacitors smaller than 1μF?

Yes-MP20042DG-DD-LF-Z is stable with ceramic output capacitors as low as 0.47μF (ESR <1.2Ω). The datasheet confirms stability across 0.47–10μF, enabling use of compact 0402/0603 case sizes. Smaller values reduce board area but may increase transient voltage deviation during rapid load steps.

Is the exposed thermal pad on the QFN8 package required to be connected to ground?

Yes-the exposed thermal pad must be soldered to a PCB ground plane. It is electrically connected to GND (Pin 4) internally and serves as the primary heat dissipation path. Omitting this connection raises θJA from 80°C/W to >120°C/W, risking thermal shutdown under 150mA load at +70°C ambient.

Does MP20042DG-DD-LF-Z support reverse current blocking?

No-it lacks integrated reverse current blocking. The internal PMOS pass element includes a body diode that conducts if VOUT exceeds VIN by >0.7V. For applications with possible back-driving (e.g., hot-swap, battery backup), an external Schottky diode (e.g., Diodes Inc. DFLS1100) must be placed in series with VIN to prevent reverse current flow.

How does the MP20042DG-DD-LF-Z handle simultaneous load transients on both channels?

Each LDO responds independently to its own load step due to separate feedback loops and pass transistors. Typical load transient spike is <30mV for 0–80mA steps with 2.2μF output capacitors. Cross-talk between channels is suppressed to <−100dB, ensuring one channel's transient does not degrade the other's regulation.

What is the minimum recommended trace width for the GND connection to the thermal pad?

A minimum of 0.5mm wide copper trace is recommended from the thermal pad to the main ground plane, with at least four 0.3mm-diameter thermal vias placed within the pad area. This configuration maintains thermal resistance below 15°C/W from junction to board, preventing derating of output current above 60°C ambient.

Are the EN1 and EN2 pins compatible with 1.8V logic levels?

No-EN1 and EN2 require VIH ≥1.6V (min) and VIL ≤0.45V (max) referenced to GND, with full specification guaranteed only when driven from 2.5V–6.0V logic sources. A 1.8V GPIO may fail to reliably assert EN high across temperature and process variation; level-shifting or pull-up to VIN is advised for 1.8V-controller interfaces.