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

Overview

MP20042DG-MG-LF-Z from Monolithic Power Systems is a dual-channel, low-noise, high-PSRR linear regulator with fixed 2.8V and 1.8V outputs, 1% accuracy, 200mA per channel, 72dB PSRR at 1kHz, and 11μVRMS output noise-designed for powering RF and analog circuitry in battery-powered wireless LAN and handheld devices.

For engineers reviewing the MP20042DG-MG-LF-Z datasheet, MP20042DG-MG-LF-Z pinout, MP20042DG-MG-LF-Z application, or MP20042DG-MG-LF-Z equivalent, key selection criteria include dual independent enable control, ultra-low quiescent current (114μA), fast transient response with small ceramic capacitors, thermal shutdown at 140°C, and QFN8 package thermal performance.

Technical Context

The MP20042DG-MG-LF-Z integrates two independent PMOS-based LDOs with separate EN1/EN2 inputs, enabling selective channel shutdown to achieve near-zero standby current. Each regulator maintains regulation down to 110mV dropout at 100mA and supports input voltages from 2.5V to 6.0V.

Its architecture delivers high channel-to-channel isolation (>150dB at 100Hz), low 11μVRMS integrated noise (10Hz–100kHz), and stable operation with 0.47–10μF ceramic output capacitors (ESR < 1.2Ω), eliminating need for external compensation.

Key Specifications

Pinout & Package

MP20042DG-MG-LF-Z is housed in a thermally enhanced 2mm × 2mm QFN8 package with exposed thermal pad (JEDEC MO-229 VCCD-3 compliant). The package enables low θJA (80°C/W) when soldered to a 4-layer board with proper ground plane connection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6216D2818MR-G and RT9013-2818GB, MP20042DG-MG-LF-Z uniquely balances 200mA/channel capability, 72dB PSRR, 11μVRMS noise, and thermal protection in a 2mm × 2mm footprint-making it optimal for space-constrained, noise-sensitive dual-rail systems.

Availability

MP20042DG-MG-LF-Z is available at Aetrix Electronics and suitable for wireless LAN modules, portable medical sensors, and industrial handheld terminals requiring stable component supply, consistent parametric performance, and RoHS-compliant packaging.

Supply support for MP20042DG-MG-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 design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MP20042 belongs to MPS's low-noise, high-PSRR LDO product line-engineered specifically for noise-critical, battery-powered applications demanding dual-rail precision regulation with minimal board area.

FAQ

What are the exact output voltages programmed in MP20042DG-MG-LF-Z?

The MP20042DG-MG-LF-Z is factory-configured with fixed 2.8V on Channel 1 (VOUT1) and 1.8V on Channel 2 (VOUT2), verified per the ordering guide code "M" (2.8V) and "G" (1.8V). These values are trimmed to ±1% accuracy across temperature and load, with no external feedback resistors required.

Can MP20042DG-MG-LF-Z operate from a 2.5V input while delivering 200mA at both outputs?

No-while the minimum input voltage is 2.5V, delivering 200mA at VOUT2=1.8V requires ≥1.91V headroom (110mV dropout at 100mA, scaling with load). At 200mA, dropout rises to 250mV, so VIN must be ≥2.05V for 1.8V output. For reliable 200mA operation on both rails, VIN ≥2.8V is recommended.

Is the exposed thermal pad electrically connected, and how should it be handled on the PCB?

Yes-the exposed pad is internally connected to GND and must be soldered to a dedicated PCB ground plane using ≥4 thermal vias (0.3mm diameter) to maximize heat dissipation. Leaving it unconnected degrades θJA by >30°C/W and risks thermal shutdown under sustained 200mA load.

Does MP20042DG-MG-LF-Z require external compensation components?

No-MP20042DG-MG-LF-Z is internally compensated and stable with ceramic output capacitors from 0.47μF to 10μF and ESR < 1.2Ω. Adding external RC networks or tantalum capacitors may destabilize regulation and is not recommended per the datasheet.

How does the channel-to-channel isolation perform, and why does it matter?

Channel-to-channel isolation exceeds 150dB at 100Hz, meaning noise or transients on one output minimally couple to the other. This is critical in mixed-signal systems-e.g., preventing digital switching noise on the 1.8V rail from corrupting analog measurements on the 2.8V rail-eliminating need for separate regulators or ferrite beads.

What happens if EN1 or EN2 is left floating?

Leaving EN1 or EN2 floating violates absolute maximum ratings and causes unpredictable behavior-including partial turn-on, increased quiescent current, or oscillation-due to internal gate leakage. The datasheet explicitly mandates tying unused EN pins to VIN or GND; never leave them unconnected.