Monolithic Power Systems Inc. MP20049DC-2.8-LF-P

Overview

MP20049DC-2.8-LF-P from Monolithic Power Systems is an ultra-low-noise, high-PSRR 150mA linear regulator in a 0.8×0.8mm WLCSP package, delivering fixed 2.8V output with ±1% accuracy across –40°C to +125°C. It operates from 2.3V–6V input, achieves 60mV dropout at 150mA, and delivers 16µV_RMS output noise (100Hz–100kHz) without external bypass capacitor-optimized for RF-sensitive analog rails in battery-powered mobile devices.

For engineers reviewing the MP20049DC-2.8-LF-P datasheet, MP20049DC-2.8-LF-P pinout, MP20049DC-2.8-LF-P application, or MP20049DC-2.8-LF-P equivalent, key selection criteria include its 78dB PSRR at 1kHz, 1µF ceramic capacitor stability, EN-controlled shutdown, thermal/overcurrent protection, and ultra-small footprint for space-constrained portable designs.

Technical Context

The MP20049 employs an internal PMOS pass element enabling low dropout (50mV @120mA) and ultra-low quiescent current (50μA no-load), making it suitable for battery longevity-critical applications. Its proprietary internal 50pF noise-filtering structure eliminates need for external bypass capacitors while maintaining 16µV_RMS noise performance.

It integrates enable-controlled startup/shutdown, under-voltage lockout (<2.3V disable), thermal shutdown (150°C trip, 20°C hysteresis), and current limiting (165–380mA range). The regulator is stable with ≥0.7μF ceramic output capacitance (ESR ≤1Ω) and requires no external compensation.

Key Specifications

Pinout & Package

MP20049DC-2.8-LF-P uses a 4-ball 0.8×0.8mm WLCSP (Wafer-Level Chip Scale Package) with bottom-side solder balls and pin 1 identification marking. Thermal performance relies on PCB copper area under the package.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-noise LDO regulator applications.

Compared with XC6210B282MR-G and RT9080-28PU5, MP20049DC-2.8-LF-P offers the lowest noise (16µV_RMS), smallest footprint (0.64mm²), and tightest dropout (60mV), making it optimal for miniaturized, RF-sensitive, and battery-constrained designs where every µV and mV matters.

Availability

MP20049DC-2.8-LF-P is available at Aetrix Electronics and suitable for cellular mobile phones, wireless LAN modules, handheld medical sensors, and digital camera power management requiring stable component supply, consistent parametric performance, and long-term lifecycle availability.

Supply support for MP20049DC-2.8-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 mixed-signal ICs for power management, motor drive, and automotive applications.

The MP20049 belongs to MPS's ultra-low-noise LDO product line, engineered specifically for noise-sensitive analog and RF subsystems in portable electronics where space, efficiency, and signal integrity are co-constrained.

FAQ

What is the minimum output capacitance required for MP20049DC-2.8-LF-P stability?

The MP20049DC-2.8-LF-P is stable with a minimum 0.7µF ceramic capacitor (ESR ≤1Ω) on the output. However, 1µF is recommended for guaranteed performance across all loads and temperature ranges, per the datasheet's typical application circuit and stability characterization.

Does MP20049DC-2.8-LF-P require an external noise bypass capacitor?

No. The MP20049DC-2.8-LF-P integrates an internal 50pF bypass structure that achieves 16µV_RMS output noise (100Hz–100kHz) without any external bypass capacitor-confirmed in the Electrical Characteristics table and Application Information section.

What is the EN pin behavior during power-up?

The EN pin has internal pull-down; if left unconnected, the device remains off. To ensure reliable startup, connect EN to VIN or drive it above 1.2V. The EN threshold is specified as VIH ≥1.2V and VIL ≤0.4V over 3.3–5.5V input range, with hysteresis preventing chatter near threshold.

How does thermal shutdown operate in MP20049DC-2.8-LF-P?

Thermal shutdown activates at TJ = 150°C and holds output off until junction temperature falls by 20°C (to ~130°C), at which point regulation resumes automatically. This hysteresis prevents oscillation during sustained overload and is verified in the Absolute Maximum Ratings and Operation sections.

Can MP20049DC-2.8-LF-P be used with input voltages below 2.3V?

No. The device incorporates under-voltage lockout (UVLO) that disables regulation when VIN drops below ~2.3V. Below this threshold, the output is not regulated and may track input or fall unpredictably-this is intentional for predictable power sequencing in battery-powered systems.

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

Using θJA = 330°C/W from the datasheet, PD(MAX) = (125°C − 85°C) / 330°C/W ≈ 121mW. At 2.8V output and 150mA load, power dissipation is (VIN − 2.8V) × 0.15A; thus, max safe VIN is ~3.6V at TA = +85°C to stay within thermal limits.