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

Overview

MP20043DGT-C-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 provides output discharge during shutdown. Used in battery-powered wireless LAN modules requiring stable dual-rail biasing.

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

Technical Context

The MP20043 implements two independent LDO channels with P-channel MOSFET pass elements, enabling ultra-low dropout (60mV @ 100mA) and near-zero quiescent current in shutdown mode (0.01–1µA). Each channel features dedicated enable logic (EN1/EN2), internal current limiting (660mA short-circuit limit), and thermal shutdown with 10°C hysteresis.

Output voltage is set by binary encoding of P1/P2 pin states (High/Low/Open), yielding nine distinct combinations per configuration set (e.g., Combination C). The device operates from 2.5V–5.5V input and maintains 1.2% load regulation for VOUT >1.5V, supporting precision rail generation in space-constrained RF subsystems.

Key Specifications

Pinout & Package

TQFN8 (2mm × 2mm) package with exposed thermal pad; 0.4mm pitch; RoHS-compliant, halogen-free construction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6216D282MR-G and RT9013-33GB, MP20043DGT-C-LF-Z uniquely delivers coordinated dual-rail programmability, integrated discharge, and superior noise/PSRR performance - essential for modern wireless and portable multi-rail systems.

Availability

MP20043DGT-C-LF-Z is available at Aetrix Electronics and suitable for cellular phones, battery-powered handheld equipment, laptop subsystems, and wireless LAN modules requiring stable component supply with guaranteed long-term sourcing.

Supply support for MP20043DGT-C-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 battery-powered portable electronics requiring dual-rail flexibility, ultra-low IQ, and robust thermal management.

FAQ

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

The top marking for MP20043DGT-C-LF-Z is "3Z", as specified in the official MPS ordering guide. This marking identifies the specific programmable voltage combination (Combination C) implemented in the device, where P1 and P2 states yield defined VOUT1/VOUT2 pairs such as 1.8V/2.8V or 2.6V/3.3V.

How does the output discharge function operate during shutdown?

When EN1 or EN2 is driven low, the corresponding VOUT pin connects internally to GND through a 20–100Ω discharge path. This actively pulls the output rail to ground within microseconds, preventing floating voltages that could cause downstream latch-up or leakage in powered-off subsystems.

Can P1 and P2 pins be left unconnected?

Yes - P1 and P2 support Open state as a valid programming condition. An open pin is internally biased to ~0.7V, interpreted as "Open" by the internal logic. This state is used in all nine voltage combinations (e.g., Open/Open = 2.8V/3.3V in Combination A) and requires no external pull-up/down resistors.

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 causes thermal shutdown; layout with exposed pad soldering to ≥2cm² copper improves heat dissipation beyond datasheet limits.

Is the MP20043DGT-C-LF-Z compatible with 1µF ceramic output capacitors?

Yes - the MP20043 is optimized for 0.47µF–10µF ceramic output capacitors with ESR <1Ω. A 1µF X7R capacitor meets stability and transient response requirements per MPS application note AN-101, and avoids the size/cost penalty of larger bulk capacitance.

Does the device support simultaneous shutdown of both channels?

Yes - driving both EN1 and EN2 low places the entire IC into near-zero current shutdown mode (<1µA total supply current). This is explicitly validated in the datasheet and enables true system-level deep-sleep states in battery-powered applications.

What is the minimum input voltage required for 3.3V output regulation?

For 3.3V output, minimum input is VOUT + VDROP(MIN). With 60mV typical dropout at 100mA, VIN(MIN) = 3.36V. However, the absolute minimum operating VIN is 2.5V per datasheet - so 3.3V output is only sustainable at light loads or with VIN ≥3.36V for full 300mA capability.