Monolithic Power Systems Inc. MP20046DN-F-LF-Z

Overview

MP20046DN-F-LF-Z from Monolithic Power Systems is a 1.5V fixed-output, 2A low-dropout linear regulator with 210mV dropout at full load, integrated open-drain power-good (PG) output, and 75μA ground current at 2A - designed for high-efficiency battery-powered telecom and server point-of-load regulation.

For engineers reviewing the MP20046DN-F-LF-Z datasheet, MP20046DN-F-LF-Z pinout, MP20046DN-F-LF-Z application, or MP20046DN-F-LF-Z equivalent, key selection criteria include fast transient response under dynamic FPGA/DSP loads, thermal performance in SOIC8E with exposed pad, PSRR of 70dB at 100Hz, and PG threshold hysteresis of 1.15% VOUT.

Technical Context

The MP20046 employs an internal PMOS pass element enabling ultra-low dropout (210mV @ 2A) and sub-1μA shutdown current. Its control loop architecture delivers fast load- and line-transient response, supported by 70dB PSRR at 100Hz and 17μVRMS output noise (10Hz–30kHz).

It integrates thermal shutdown at +150°C, current limit at 3.3A (min), and a precision bandgap reference with 1.5V output accuracy of ±1% over −40°C to +125°C. The PG output asserts low when VOUT drops below 78% of nominal, with 1.15% hysteresis for noise immunity.

Key Specifications

Pinout & Package

MP20046DN-F-LF-Z is housed in a thermally enhanced SOIC8E package (8-pin, exposed thermal pad). The exposed pad must be soldered to a PCB ground plane for optimal thermal performance (θJA = 50°C/W, θJC = 10°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A4700RGWR and ADM7172ACPZ-R7, MP20046DN-F-LF-Z uniquely combines 2A capability, integrated PG, SOIC8E compatibility, and 17μVRMS noise - making it optimal for cost-sensitive, space-constrained 5G and industrial FPGA power delivery where all four attributes are required.

Availability

MP20046DN-F-LF-Z is available at Aetrix Electronics and suitable for telecom infrastructure, server point-of-load, and FPGA/DSP power applications requiring stable component supply, RoHS-compliant packaging, and tape-and-reel delivery for automated assembly.

Supply support for MP20046DN-F-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, headquartered in Kirkland, Washington, with global design and support centers.

The MP20046 belongs to MPS's fast-transient LDO family, engineered specifically for high-current, low-noise point-of-load regulation in next-generation wireless infrastructure, data center equipment, and battery-powered edge devices.

FAQ

What is the minimum input voltage required for MP20046DN-F-LF-Z 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. The device specifies 2.7V minimum recommended input to ensure margin across temperature and tolerance.

Can MP20046DN-F-LF-Z be used without the SENSE pin connection?

Yes - the SENSE pin is optional. When left unconnected, the regulator operates in standard (non-remote-sense) mode using internal feedback. However, omitting SENSE forfeits compensation for PCB trace IR drop, reducing output voltage accuracy under high load currents.

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 output and reduces ground current to 1μA. Floating EN is prohibited - it may cause erratic enable/disable behavior due to noise coupling; tie to GND for always-on operation.

What is the purpose of the exposed thermal pad on the SOIC8E package?

The exposed pad is electrically GND and serves as the primary thermal conduction path. Soldering it to a ≥100mm² PCB copper pour reduces θJA from 50°C/W to ≤35°C/W, enabling sustained 2A operation at +70°C ambient without thermal shutdown.

Does MP20046DN-F-LF-Z require specific output capacitor ESR values?

Yes - it is optimized for ceramic capacitors with ESR <1.5Ω. Unlike older LDOs, it does not require added ESR for stability. Using higher-ESR tantalum or aluminum electrolytics may cause oscillation; 47μF X7R ceramic is the validated solution.

How is power-good (PG) asserted, and what external components are needed?

PG is an open-drain output that pulls low when VOUT falls below 78% of 1.5V (1.17V). A pull-up resistor (typically 10–100kΩ to VIN or VCC) is mandatory. No capacitor is required unless extended PG delay is needed - then add a small cap (e.g., 100pF) to ground.

What thermal protection behavior occurs during overload conditions?

At junction temperature ≥+150°C, the PMOS pass device shuts off completely. After cooling by ≥20°C (to ≤+130°C), the device auto-restarts. This hiccup-mode protection prevents permanent damage while maintaining system visibility via PG deassertion during thermal events.