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

Overview

MP20043DGT-B-LF-P from Monolithic Power Systems is a dual-channel, 300mA low-dropout linear regulator with programmable output voltage (1.2V–3.3V in 100mV steps), 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 during shutdown. Used in battery-powered wireless LAN modules requiring stable dual-rail biasing.

For engineers reviewing the MP20043DGT-B-LF-P datasheet, MP20043DGT-B-LF-P pinout, MP20043DGT-B-LF-P application, or MP20043DGT-B-LF-P equivalent, key selection criteria include programmable dual-voltage configuration, 60mV dropout at 100mA, thermal shutdown at 140°C, shutdown current <1µA, 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's output voltage is set by binary-coded states of P1 and P2 pins-low, high, or open-yielding nine discrete combinations per variant (e.g., Combination B for MP20043DGT-B-LF-P).

It integrates per-channel current limiting (660mA short-circuit limit), thermal protection with 10°C hysteresis, and active output discharge (20–100Ω resistance when disabled). The device operates from 2.5V to 5.5V input and maintains ±2.5% output accuracy across –40°C to +85°C ambient temperature.

Key Specifications

Pinout & Package

TQFN8 (2mm × 2mm) package with exposed thermal pad; 0.4mm pitch, JEDEC MO-229 WCCD-3 compliant; requires solder paste stencil design for reliable thermal and electrical connection to PCB ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6223D121MR-G and RP111N281B-TR-F, MP20043DGT-B-LF-P uniquely delivers programmable asymmetric dual outputs, 300mA per channel, and 60mV dropout-making it the sole choice for space-constrained, multi-rail battery-powered designs requiring voltage flexibility and low IQ.

Availability

MP20043DGT-B-LF-P is available at Aetrix Electronics and suitable for wireless LAN modules, portable medical sensors, laptop embedded controllers, and industrial hand-held scanners requiring stable component supply across product lifecycles.

Supply support for MP20043DGT-B-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 MP20043 belongs to MPS's low-noise, programmable LDO product line-designed specifically for battery-powered portable electronics needing flexible, space-efficient dual-rail regulation with minimal quiescent power.

FAQ

What voltage combinations does MP20043DGT-B-LF-P support?

MP20043DGT-B-LF-P implements Combination B per the datasheet, supporting nine specific VOUT1/VOUT2 pairs including 1.2V/3.3V, 1.2V/1.8V, 1.5V/2.5V, and 3.3V/3.3V. These are selected exclusively by P1 and P2 pin states-no external resistors or firmware required.

Can EN1 and EN2 be tied together?

Yes, EN1 and EN2 may be connected to a common enable signal if simultaneous channel control is acceptable. However, doing so forfeits independent sequencing capability-critical for systems requiring staggered power-up or fault isolation between domains.

Is an external output capacitor mandatory?

Yes. A ceramic capacitor of 0.47–10µF with ESR <1Ω is required on each VOUT pin for stability, transient response, and noise reduction. Omitting it risks oscillation, poor load regulation, and failure to meet PSRR/noise specifications.

What is the function of the exposed thermal pad?

The exposed pad on the TQFN8 package serves as the primary thermal and electrical ground path. It must be soldered to a dedicated PCB ground plane with ≥4 thermal vias to maintain junction temperature ≤125°C under full 300mA load per channel.

Does MP20043DGT-B-LF-P support reverse current blocking?

No. The internal PMOS pass devices do not provide inherent reverse current blocking. If input voltage can fall below output (e.g., during hot-swap or backup battery switchover), an external Schottky diode or ideal diode controller is required to prevent backfeed.

How is the "Open" state of P1/P2 defined electrically?

An "Open" state is detected when the pin voltage is 0.7V (typical) due to internal biasing-no external pull-up/down needed. This eliminates ambiguity versus floating inputs and ensures deterministic voltage selection across temperature and process variation.

What happens during thermal shutdown?

When junction temperature exceeds 140°C, both LDOs shut down immediately. Output resumes automatically only after temperature drops by ≥10°C (hysteresis), preventing rapid cycling. During shutdown, quiescent current falls to <1µA and output discharge activates.