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

Overview

MP20043DGT-B-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, and integrated output discharge. It uses internal PMOS pass devices, delivers 75dB PSRR at 1kHz, and supports independent enable control per channel for battery-powered portable electronics.

For engineers reviewing the MP20043DGT-B-LF-Z datasheet, MP20043DGT-B-LF-Z pinout, MP20043DGT-B-LF-Z application, or MP20043DGT-B-LF-Z equivalent, key selection criteria include programmable dual-voltage configuration, 60mV dropout at 100mA, 7μVRMS output noise, shutdown current <1μA, and TQFN8 (2mm×2mm) thermal performance.

Technical Context

The MP20043 implements two independent LDO regulators with P-channel MOSFET pass elements, enabling ultra-low dropout (60mV @ 100mA) and near-zero quiescent current in shutdown (≤1μA). Each channel features dedicated EN pins, internal current limiting (660mA), and thermal shutdown at 140°C with 10°C hysteresis.

Voltage programming is achieved via binary-state logic on P1 and P2 pins (High/Low/Open), selecting one of nine pre-defined VOUT1/VOUT2 pairs across four combinations (A/B/C/E). Output discharge resistance is 20–100Ω when disabled, ensuring rapid rail collapse in power sequencing.

Key Specifications

Pinout & Package

TQFN8 (2mm × 2mm, 0.5mm pitch) with exposed thermal pad; RoHS-compliant, halogen-free, lead-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6216Dxx3MR and RT9080L, MP20043DGT-B-LF-Z uniquely combines dual-channel programmability, sub-100mV dropout, integrated discharge, and 7μVRMS noise in a 2mm×2mm package - optimizing for space-constrained, battery-sensitive designs requiring flexible rail generation.

Availability

MP20043DGT-B-LF-Z is available at Aetrix Electronics and suitable for wireless LAN modules, battery-powered medical sensors, laptop subsystems, and industrial handheld scanners requiring stable component supply across extended temperature ranges (−40°C to +85°C).

Supply support for MP20043DGT-B-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 low-noise, programmable LDO product line, engineered specifically for portable and battery-operated systems demanding dual-rail flexibility, minimal quiescent power, and robust thermal protection.

FAQ

What top marking corresponds to MP20043DGT-B-LF-Z?

The top marking for MP20043DGT-B-LF-Z is "6X", laser-etched on the TQFN8 package. This marking is specified in the official MPS ordering guide and matches the device's combination B voltage programming table.

Can P1 and P2 pins be left unconnected?

Yes - "Open" is a defined programming state (not floating) with 0.7V internal bias, enabling specific VOUT1/VOUT2 pairs like 2.8V/3.3V in Combination A. External pull-up/pull-down resistors are unnecessary and discouraged.

Does MP20043DGT-B-LF-Z support simultaneous shutdown of both channels?

Yes - driving both EN1 and EN2 to GND disables both outputs and reduces total supply current to ≤1μA. The device enters near-zero-power state with active output discharge on both rails.

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

Using θJA = 80°C/W and TJ(MAX) = 125°C, maximum continuous power dissipation at TA = 85°C is (125 − 85)/80 = 0.5W. Exceeding this risks thermal shutdown; PCB copper area under the exposed pad improves margin.

Is output capacitor ESR critical for stability?

No - MP20043 is optimized for ceramic capacitors with ESR <1Ω. Unlike older LDOs, it does not require minimum ESR and remains stable with zero-ESR MLCCs, simplifying layout and reducing cost.

How does the current limit behave during short-circuit conditions?

Each channel limits to 660mA typical under short-circuit. The current limit is foldback-free and non-latching - output recovers immediately after fault removal without requiring reset or power cycle.

What is the function of the exposed thermal pad?

The exposed pad is electrically connected to GND and serves as the primary thermal conduction path. It must be soldered to a solid ground plane to achieve θJA = 80°C/W; omitting this increases junction temperature by >30°C at full load.