Monolithic Power Systems Inc. MP20046DN-F-LF

Overview

MP20046DN-F-LF from Monolithic Power Systems is a 1.5V fixed-output, 2A low-dropout linear regulator with 210mV dropout at full load, internal PMOS pass element, open-drain power-good (PG) output, and 75μA ground current at 2A. It targets battery-powered systems requiring fast transient response, low noise (17μVRMS), and high PSRR (70dB at 100Hz).

For engineers reviewing the MP20046DN-F-LF datasheet, MP20046DN-F-LF pinout, MP20046DN-F-LF application, or MP20046DN-F-LF equivalent, key selection criteria include dropout voltage under 2A load, PG threshold accuracy (78–86% VOUT), thermal shutdown at +150°C, SOIC8E package thermal resistance (θJA = 50°C/W), and compatibility with 47μF ceramic output capacitors.

Technical Context

The MP20046DN-F-LF employs an internal PMOS pass transistor enabling ultra-low dropout and sub-1μA shutdown current. Its control loop architecture delivers fast load- and line-transient response, supported by integrated current limiting (3.3A typ.) and thermal protection.

It features a precision bandgap reference and internal low-pass filtering to achieve 17μVRMS output noise (10Hz–30kHz). The open-drain PG output asserts low when VOUT drops below 78–86% of nominal, with 1.15% hysteresis and ≤0.4V output low voltage at 1mA sink.

Key Specifications

Pinout & Package

MP20046DN-F-LF uses the thermally enhanced SOIC8E (8-pin, exposed pad) package. The exposed pad must be soldered to a PCB ground plane for optimal thermal performance (θJC = 10°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-dropout, 2A linear regulator applications.

Compared with TPS7A8300RGRT and ADM7172ACPZ-R7, MP20046DN-F-LF uniquely combines ultra-low 75μA ground current, SENSE pin for precision remote regulation, and integrated open-drain PG - making it optimal for space-constrained, battery-sensitive, and reset-critical embedded systems.

Availability

MP20046DN-F-LF is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLC modules, and portable test equipment requiring stable component supply, RoHS-compliant packaging, and extended temperature operation (-40°C to +85°C).

Supply support for MP20046DN-F-LF 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 MP20046 belongs to MPS's Fast-Transient LDO family, engineered specifically for high-current, low-noise, battery-operated applications demanding rapid load-step response and minimal quiescent power.

FAQ

What is the minimum input voltage required for MP20046DN-F-LF to regulate 1.5V output at 2A?

The minimum input voltage is 1.71V, calculated as VOUT + VDO = 1.5V + 210mV. Operation below this causes dropout - output voltage collapses linearly with input. Input must remain ≥2.7V per recommended operating conditions to guarantee full specification compliance including PSRR and noise performance.

Can the SENSE pin be left unconnected if remote sensing is not needed?

No. The SENSE pin must be connected directly to the VOUT pins (pins 1 and 2) on the PCB. Leaving it floating violates the internal feedback topology and causes regulation instability or failure. For local sensing only, short SENSE to VOUT at the device pins using a low-inductance trace.

How does the EN pin logic work, and what happens if it's left floating?

The EN pin is active-low: logic low (≤0.4V) enables regulation; logic high (≥1.5V) disables it. Floating EN is strictly prohibited - it may float to indeterminate voltage, causing erratic on/off behavior or latch-up. Tie EN to GND via 10kΩ resistor for always-on operation, or drive actively with compatible logic.

What output capacitor ESR range is supported, and why is low ESR critical?

MP20046DN-F-LF is optimized for ceramic capacitors with ESR <1.5Ω. Low ESR minimizes output impedance at high frequencies, improving load-transient response and reducing peak voltage deviation during current steps. High-ESR capacitors (e.g., electrolytic) degrade transient performance and may cause instability.

Does the PG output require an external pull-up resistor, and what value is recommended?

Yes - PG is open-drain and requires an external pull-up to a valid logic-high voltage (e.g., VIN or separate 3.3V rail). A 10kΩ resistor is typical: lower values improve rise time but increase static current; higher values risk slow edges or noise susceptibility. Pull-up must be placed close to the PG pin.

How does thermal performance differ between SOIC8E and QFN10 packages?

SOIC8E has θJA = 50°C/W and θJC = 10°C/W; QFN10 has θJA = 60°C/W and θJC = 12°C/W. The SOIC8E's lower θJA makes it superior for natural-convection environments, while QFN10's smaller footprint suits dense layouts - but both require exposed-pad soldering to GND for rated thermal performance.

Is the 1.5V output voltage adjustable via external resistors?

No. MP20046DN-F-LF is a fixed-output variant (top marking "F"). Adjustable versions (e.g., MP20046DQ-S) exist for other voltages, but none support external resistor programming. Output voltage is laser-trimmed during wafer sort and cannot be modified post-manufacture.