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

Overview

MP20046DN-S-LF-Z from Monolithic Power Systems is a fast-transient-response, 2A low-dropout linear regulator with 3.3V fixed output, 210mV dropout at 2A, 70dB PSRR at 100Hz, and open-drain power-good (PG) output - used for FPGA core supply regulation in telecom infrastructure where tight voltage accuracy and rapid load-step immunity are critical.

For engineers reviewing the MP20046DN-S-LF-Z datasheet, MP20046DN-S-LF-Z pinout, MP20046DN-S-LF-Z application, or MP20046DN-S-LF-Z equivalent, this LDO delivers verified 17μVRMS noise, thermal shutdown at +150°C, and SOIC8E/QFN10 package options - enabling robust power delivery in space-constrained, thermally demanding embedded systems.

Technical Context

The MP20046 employs an internal PMOS pass element to achieve ultra-low dropout and sub-100μA ground current across full 2A load range. Its control loop architecture enables <10μs response to 1A load transients while maintaining ±1.5% output voltage accuracy over −40°C to +125°C junction temperature.

Integrated PG monitoring triggers at 78–86% of nominal VOUT with 1.15% hysteresis, and EN pin supports negative-logic enable with 1.5V VIH threshold. Thermal protection disables the PMOS above +150°C and auto-recovers after 20°C cooldown.

Key Specifications

Pinout & Package

MP20046DN-S-LF-Z uses the thermally enhanced SOIC8E package (8-pin, exposed pad), optimized for PCB heat dissipation via direct GND plane connection. Pin functions are validated per MPS Rev. 1.21 datasheet Figure 5 and Package Reference section.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A4700RGWR and ADM7172ACPZ-R7, MP20046DN-S-LF-Z uniquely combines integrated PG, SOIC8E thermal performance, and 210mV dropout at 2A - making it optimal for FPGA and telecom systems requiring coordinated power sequencing and thermal resilience.

Availability

MP20046DN-S-LF-Z is available at Aetrix Electronics and suitable for telecom infrastructure, FPGA-based industrial controllers, and 5G small cell radios requiring stable component supply, RoHS-compliant packaging, and tape-and-reel delivery for automated assembly.

Supply support for MP20046DN-S-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 California and serving global industrial, automotive, and communications markets since 1997.

The MP20046 belongs to MPS's Fast-Transient LDO product line, engineered specifically for FPGA, DSP, and telecom ASIC core supplies where rapid load-step immunity, low noise, and integrated power monitoring are essential.

FAQ

What is the minimum input voltage required for MP20046DN-S-LF-Z to regulate 3.3V at 2A?

The minimum input voltage is 3.51V, calculated as VOUT + VDO = 3.3V + 0.21V. At 2A load and 25°C, the dropout voltage is guaranteed ≤400mV, but typical performance is 210mV - allowing reliable operation from a 3.51V source such as a LiFePO₄ battery or post-regulated intermediate bus.

Does MP20046DN-S-LF-Z require an external pull-up resistor on the PG pin?

Yes - the PG pin is open-drain and must be pulled up to a valid logic-high voltage (e.g., 3.3V or 5V) with a resistor between 10kΩ and 100kΩ. Without this pull-up, PG cannot assert a high state, disabling its function as a power-valid indicator for microcontroller reset circuits.

Can MP20046DN-S-LF-Z operate without the SENSE pin connected?

No - the SENSE pin must be connected directly to the VOUT net at the load point. Leaving it unconnected degrades load regulation to ±4mV and invalidates the ±1.5% output accuracy specification. For non-remote-sense applications, connect SENSE to VOUT at the IC's output pins using a short, low-impedance trace.

What is the recommended output capacitor for MP20046DN-S-LF-Z in a 2A FPGA supply?

A 47μF X7R ceramic capacitor with ESR <1.5Ω is specified. For improved transient response in FPGA core rails, use two parallel 22μF capacitors (total 44μF) placed within 5mm of VOUT/SENSE pins - reducing effective ESR and inductance while meeting the stability criteria defined in MPS Application Note AN-115.

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

The EN pin uses negative logic: low = enabled, high = disabled. If left floating, leakage currents may cause indeterminate operation - potentially enabling or disabling the regulator unpredictably. Always tie EN to GND (for always-on) or drive with a clean logic signal; never leave unconnected.

Is MP20046DN-S-LF-Z compatible with lead-free reflow profiles?

Yes - the SOIC8E package is RoHS-compliant and qualified for standard JEDEC J-STD-020D reflow profiles, including peak temperatures up to 260°C for 10 seconds. The exposed thermal pad must be fully soldered to ensure mechanical reliability and thermal performance per MPS Package Information drawing.

What thermal derating applies when using MP20046DN-S-LF-Z in a 60°C ambient environment?

At TA = 60°C, maximum continuous power dissipation is limited to 1.8W (SOIC8E), calculated as (TJ(MAX) − TA)/θJA = (150°C − 60°C)/50°C/W. To sustain 2A output at 3.3V, ensure VIN ≤ 4.2V to keep PDISS = 2A × (VIN − 3.3V) ≤ 1.8W - otherwise thermal shutdown will activate.