Monolithic Power Systems Inc. MP20043DGT-A-LF-Z

Overview

MP20043DGT-A-LF-Z from Monolithic Power Systems is a dual-channel, 300mA low-dropout linear regulator with programmable output voltage (1.2V–3.3V in 100mV steps, ±2.5% accuracy), 75dB PSRR at 1kHz, and 7μVRMS output noise. It uses internal PMOS pass devices, supports independent channel enable via EN1/EN2, and features output discharge on shutdown. It powers dual-rail subsystems in battery-powered wireless devices.

For engineers reviewing the MP20043DGT-A-LF-Z datasheet, MP20043DGT-A-LF-Z pinout, MP20043DGT-A-LF-Z application, or MP20043DGT-A-LF-Z equivalent, key selection criteria include programmable dual-output voltage configuration, 60mV dropout at 100mA, shutdown current <1μA, thermal protection at 140°C, and TQFN8 (2mm×2mm) package compatibility with space-constrained PCB layouts.

Technical Context

The MP20043 implements two independent LDO channels using P-channel MOSFET pass elements, enabling ultra-low dropout (60mV @ 100mA) and near-zero quiescent current in shutdown mode (0.01–1μA). Each channel's output voltage is selected by ternary logic states (High/Low/Open) applied to P1 and P2 pins, yielding nine discrete combinations per configuration set (e.g., Combination A).

It integrates per-channel current limiting (660mA short-circuit limit), thermal shutdown (140°C activation, 10°C hysteresis), and output discharge (20–100Ω resistance when disabled). The device operates from 2.5V–5.5V input and maintains 75dB PSRR up to 1kHz while delivering ≤7μVRMS integrated noise over 10Hz–30kHz.

Key Specifications

Pinout & Package

MP20043DGT-A-LF-Z is housed in a thermally enhanced TQFN8 package (2mm × 2mm, 0.5mm pitch) with exposed thermal pad. Pin 1 identifier is marked on top surface; recommended land pattern includes solder paste stencil for the exposed paddle to ensure optimal thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6216D182MR-G and RP111Q281D-TR-F, MP20043DGT-A-LF-Z uniquely delivers dual independently enabled, programmable outputs in one TQFN8 package-reducing BOM count, PCB area, and design complexity for multi-rail battery-powered systems.

Availability

MP20043DGT-A-LF-Z is available at Aetrix Electronics and suitable for cellular phones, battery-powered equipment, laptop subsystems, and wireless LAN modules requiring stable component supply across industrial temperature ranges (–40°C to +85°C).

Supply support for MP20043DGT-A-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.

The MP20043 belongs to MPS's precision dual-LDO product line, engineered specifically for space-constrained, battery-operated devices demanding programmable dual-rail power with ultra-low noise and shutdown current.

FAQ

What are the valid logic states for P1 and P2 pins, and how do they affect output voltage?

P1 and P2 each accept three states: High (≥1.6V), Low (≤0.4V), or Open (high-impedance). Their combined states select one of nine pre-defined VOUT1/VOUT2 pairs per configuration set (e.g., Combination A). For example, P1=Open and P2=Open yields VOUT1=2.8V and VOUT2=3.3V. Bias currents are specified: High-state draw ≤5µA, Low-state sink ≤8µA, Open-state leakage <0.7V offset.

Does MP20043DGT-A-LF-Z require external capacitors, and what are the minimum values?

Yes: a minimum 0.47µF ceramic input capacitor (X5R/X7R) is required at VIN, and each output requires 0.47–10µF ceramic capacitors with ESR <1Ω. Larger values improve transient response and noise suppression but increase footprint. Tantalum capacitors are acceptable but less stable than ceramics under bias and temperature.

How does the output discharge function operate during shutdown?

When EN1 or EN2 is driven low, the corresponding output connects internally to GND through a 20–100Ω switch, actively discharging external capacitance. This prevents floating outputs that could cause undefined logic states or parasitic power paths in downstream circuitry, critical for reliable sleep/wake transitions.

What thermal derating applies when operating at maximum ambient temperature?

At TA = +85°C, maximum continuous power dissipation is reduced to PD(MAX) = (125°C − 85°C)/80°C/W = 0.5W. With θJA = 80°C/W (4-layer board), sustained 300mA loads require VIN−VOUT ≤ 1.67V to stay within thermal limits. Use the exposed thermal pad and ground plane to maintain junction temperature ≤125°C.

Can MP20043DGT-A-LF-Z be used with input voltages below 2.5V?

No: the absolute minimum input voltage is 2.5V per datasheet specifications. Operation below this violates recommended conditions and may result in unregulated output, increased dropout, or failure to maintain specified accuracy and PSRR. For sub-2.5V inputs, consider alternative LDOs rated for lower VIN minima.

Is the MP20043DGT-A-LF-Z RoHS-compliant and halogen-free?

Yes: the part carries the "-LF" suffix indicating lead-free, halogen-free construction and full compliance with EU RoHS Directive 2011/65/EU. All MPS products meet these environmental standards, and green status documentation is available on the MPS Quality Assurance webpage.