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

Overview

MP20042DG-MG-LF-P 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, 11μV_RMS output noise, and 72dB PSRR at 1kHz - designed for powering RF and analog circuitry in space-constrained portable devices.

For engineers reviewing the MP20042DG-MG-LF-P datasheet, MP20042DG-MG-LF-P pinout, MP20042DG-MG-LF-P application, or MP20042DG-MG-LF-P 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-P integrates two independent PMOS-based LDOs with separate EN1/EN2 inputs, enabling selective channel shutdown to minimize system standby current. Each regulator maintains regulation down to 110mV dropout at 100mA and supports input voltages from 2.5V to 6.0V.

Its internal architecture delivers channel-to-channel isolation >150dB across 10Hz–1MHz, suppresses supply ripple via 72dB PSRR at 1kHz, and ensures stability with 0.47–10μF ceramic output capacitors (ESR <1.2Ω), eliminating need for external compensation.

Key Specifications

Pinout & Package

MP20042DG-MG-LF-P is housed in a thermally enhanced 2mm × 2mm QFN8 package with exposed thermal pad (JEDEC MO-229 VCCD-3 compliant). The package enables efficient heat transfer to PCB ground plane and supports reflow soldering per IPC/JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6223D2818MR-G and ADP5310ACBZ-2818-R7, MP20042DG-MG-LF-P uniquely balances ultra-low noise (11μV_RMS), high PSRR (72dB), dual independent enable, and integrated thermal/current protection - making it optimal for compact, battery-powered RF and precision analog systems where all four attributes are concurrently required.

Availability

MP20042DG-MG-LF-P is available at Aetrix Electronics and suitable for wireless LAN modules, portable medical sensors, and industrial handheld scanners requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.

Supply support for MP20042DG-MG-LF-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 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, micropower LDO product line - engineered specifically for battery-powered portable electronics demanding simultaneous clean dual-rail regulation, minimal quiescent power, and robust thermal safety.

FAQ

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

The MP20042DG-MG-LF-P is factory-configured with fixed 2.8V on Channel 1 (VOUT1) and 1.8V on Channel 2 (VOUT2), as confirmed by the ordering guide code "MG" (M = 2.8V, G = 1.8V) and electrical test data in the Rev. 0.9 datasheet. These values are trimmed to ±1% accuracy across temperature and load.

Can MP20042DG-MG-LF-P operate with a 2.5V input while delivering full 200mA at both outputs?

No - at 2.5V input, the 2.8V output cannot regulate due to insufficient headroom. Minimum input for 2.8V output is 2.91V (2.8V + 110mV dropout). For 1.8V output, 2.5V input is valid (1.8V + 110mV = 1.91V < 2.5V), supporting full 200mA on Channel 2 only.

Is an external Schottky diode required for reverse current protection?

Yes - the internal PMOS pass device has a parasitic body diode from VOUT to VIN. If VOUT exceeds VIN by >0.3V (e.g., during hot-swap or backup battery scenarios), reverse current flows. An external Schottky diode (anode to VOUT, cathode to VIN) is required per the datasheet Figure 4 to block this path.

What is the maximum allowable power dissipation at 85°C ambient temperature?

Using θ_JA = 80°C/W from the datasheet, maximum power dissipation at T_A = 85°C is P_D(MAX) = (125°C − 85°C) / 80°C/W = 0.5W. This assumes proper PCB thermal design with exposed pad soldered to ground plane; exceeding this causes thermal shutdown.

Does MP20042DG-MG-LF-P support output capacitor ESR outside the 0–1.2Ω range?

No - the datasheet specifies stability requires output capacitor ESR ≤1.2Ω (Figure 2). Using higher-ESR capacitors (e.g., standard tantalum) risks oscillation and degraded transient response. Ceramic capacitors with X5R/X7R dielectric and low-ESR construction are mandatory.

How does channel-to-channel isolation impact mixed-signal designs?

With >150dB isolation (10Hz–1MHz), noise or transients on the 2.8V rail (e.g., from a pulsed laser driver) couple less than 1μV into the 1.8V rail. This prevents digital switching noise from modulating analog sensor signals - critical for sub-16-bit ADC accuracy in medical or instrumentation applications.

What is the recommended minimum input capacitance?

The datasheet specifies a minimum 0.47μF ceramic capacitor on VIN, placed as close as possible to pins 2 (VIN) and 4 (GND). Larger values (e.g., 2.2μF) improve line transient response but are not required for basic stability - unlike many older LDOs needing 10μF+.