Monolithic Power Systems Inc. MP20041DGT-SL-LF-P

Overview

MP20041DGT-SL-LF-P from Monolithic Power Systems is a dual-channel, ultra-low-noise, high-PSRR linear regulator with 300mA per channel output capability, 11μVRMS output noise (no bypass capacitor required), and 72dB PSRR at 10kHz. It operates from 2.5V to 6.0V input, delivers 1.2V–3.6V outputs in 100mV steps with ±1% accuracy, and uses internal PMOS pass devices for low dropout-73mV at 100mA-and 114μA quiescent current. It targets battery-powered wireless LAN and handheld equipment requiring clean, stable dual-rail power.

For engineers reviewing the MP20041DGT-SL-LF-P datasheet, MP20041DGT-SL-LF-P pinout, MP20041DGT-SL-LF-P application, or MP20041DGT-SL-LF-P equivalent, key selection criteria include dual independent enable control (EN1/EN2), thermal shutdown (140°C), current limit (525mA), fast load transient response with 1μF ceramic output capacitors, and TQFN8 (2mm×2mm) package compatibility with space-constrained PCB layouts.

Technical Context

The MP20041 integrates two independent LDO regulators sharing a common input and ground, each with dedicated active-high enable pins (EN1, EN2) and output terminals (OUT1, OUT2). Its PMOS pass transistor architecture enables near-zero dropout under light loads and eliminates reverse current flow without external diodes-though an external Schottky is recommended if VOUT > VIN.

Each channel features independent current limiting (525mA short-circuit limit), thermal shutdown with 10°C hysteresis, and maintains 11μVRMS integrated noise (100Hz–100kHz) across 10mA–100mA loads. PSRR remains ≥65dB from 100Hz to 10kHz, peaking at 72dB at 10kHz under 150mA load-critical for RF-sensitive applications like WLAN baseband and RF front-end power domains.

Key Specifications

Pinout & Package

MP20041DGT-SL-LF-P is housed in a thermally enhanced 2mm × 2mm TQFN-8 package with exposed thermal pad (GND-connected), optimized for low θJA (80°C/W) on standard 4-layer PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6210B182MR-G and ADM7150ACPZ-1.8-R7, MP20041DGT-SL-LF-P uniquely delivers dual-channel integration, independent enable control, and balanced ultra-low-noise/high-PSRR performance in a 2mm×2mm footprint-reducing component count, PCB area, and system-level complexity for space-constrained battery-powered designs.

Availability

MP20041DGT-SL-LF-P is available at Aetrix Electronics and suitable for wireless LAN modules, handheld medical diagnostics, and battery-powered IoT edge nodes requiring stable component supply with guaranteed long-term manufacturability.

Supply support for MP20041DGT-SL-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 expertise in DC/DC converters, LDOs, motor drivers, and LED drivers for consumer, industrial, and automotive markets.

The MP20041 belongs to MPS's ultra-low-noise LDO product line, engineered specifically for noise-sensitive RF, precision analog, and battery-operated applications where PSRR, dropout, and quiescent current are critical system-level constraints.

FAQ

What output voltages are configured for MP20041DGT-SL-LF-P?

The "SL" suffix corresponds to factory-programmed output voltages: OUT1 = 2.8V and OUT2 = 3.3V, confirmed by MPS's official ordering guide and top marking code "7K" (for 2.8V/1.8V) and "9P" (for 3.3V/3.3V) variants-"SL" maps to 2.8V/3.3V per internal MPS documentation and distributor cross-reference data.

Can MP20041DGT-SL-LF-P operate with only one channel enabled?

Yes-EN1 and EN2 are fully independent. Driving EN1 high while holding EN2 low disables only OUT2, reducing total quiescent current to ~60μA (half the 114μA typical), and vice versa. This enables dynamic rail management without affecting the active channel's regulation or noise performance.

Is an external Schottky diode required for reverse-voltage protection?

An external Schottky diode is recommended-not required-when VOUT exceeds VIN by more than ~0.3V (e.g., hot-swap or backup battery scenarios), as the internal PMOS body diode becomes forward-biased. The datasheet Figure 4 shows this configuration to prevent unintended current backflow and potential system malfunction.

What is the minimum output capacitor value for stable operation?

The MP20041 requires a minimum 0.47μF ceramic output capacitor per channel, with ESR < 1.2Ω. Using 1μF X7R ceramics (as shown in all typical application circuits) ensures stability, optimal transient response, and full PSRR/noise specifications across temperature and load conditions.

How does thermal shutdown behave during sustained overload?

When junction temperature reaches 140°C, both LDOs shut down simultaneously. After cooling by 10°C (to 130°C), they auto-restart. This hiccup-mode cycling protects against permanent damage but indicates inadequate PCB thermal design-thermal pad soldering and ground plane area must meet MPS layout guidelines (Figure 5) for continuous 300mA operation.

Does MP20041DGT-SL-LF-P support adjustable output voltages?

No-MP20041DGT-SL-LF-P is a fixed-output device. Output voltages are factory-set and non-adjustable. Adjustable versions (e.g., feedback-pin variants) are not offered in the MP20041 family; only factory-programmed fixed outputs in 100mV increments from 1.2V to 3.6V are available.