Monolithic Power Systems Inc. MP20046DQ-S-LF-P

Overview

MP20046DQ-S-LF-P from Monolithic Power Systems is a fast-transient-response, 2A low-dropout linear regulator with fixed 3.3V output, 210mV dropout at 2A, 75μA ground current at full load, and integrated open-drain power-good (PG) output. It uses an internal PMOS pass element and is designed for high-PSRR (70dB at 100Hz), low-noise (17μVRMS) power delivery in space-constrained, battery-sensitive applications such as FPGA core supplies and telecom baseband modules.

For engineers reviewing the MP20046DQ-S-LF-P datasheet, MP20046DQ-S-LF-P pinout, MP20046DQ-S-LF-P application, or MP20046DQ-S-LF-P equivalent, key selection criteria include dropout voltage under 2A load, PG threshold accuracy (78–86% VOUT), thermal shutdown at +150°C, SOIC8E/QFN10 package compatibility, and stable operation with 47μF ceramic output capacitors.

Technical Context

The MP20046DQ-S-LF-P implements a PMOS-based LDO architecture with internal bandgap reference and error amplifier, enabling fast load- and line-transient response via high-loop-gain control. Its PG function monitors VOUT continuously and asserts low when output drops below 78–86% of nominal, with 1.15% hysteresis to prevent chatter during marginal conditions.

Thermal protection activates at TJ = +150°C and recovers at +130°C, while current limiting clamps output at 3.3–4.5A. The EN pin provides negative-logic enable (VIH = 1.5V, VIL = 0.4V), and standby current drops to 1μA when disabled - critical for battery runtime extension in portable systems.

Key Specifications

Pinout & Package

MP20046DQ-S-LF-P is housed in a thermally enhanced 10-pin QFN package (3mm × 3mm, exposed pad), optimized for high-current density PCB layouts and efficient heat dissipation through the bottom thermal pad.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-dropout, fast-transient LDO applications.

Compared with TPS7A4700RGWR and ADM7172ACPZ-R7, MP20046DQ-S-LF-P uniquely combines integrated PG, SENSE, sub-100μA ground current at full load, and QFN10 thermal performance - making it optimal for cost-sensitive, space-constrained, battery-aware 3.3V FPGA/DSP designs where system-level supervision and layout efficiency are critical.

Availability

MP20046DQ-S-LF-P is available at Aetrix Electronics and suitable for telecom base station modules, FPGA development platforms, and battery-powered test instrumentation requiring stable component supply, RoHS-compliant packaging, and tape-and-reel delivery for automated assembly.

Supply support for MP20046DQ-S-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 design centers in the US, China, and Taiwan, and global distribution since 1997.

The MP20046 belongs to MPS's high-current, fast-transient LDO product line, engineered specifically for powering noise-sensitive digital loads - including FPGAs, DSPs, and telecom baseband processors - where low dropout, low noise, and integrated supervision features reduce system complexity.

FAQ

What is the maximum input voltage for MP20046DQ-S-LF-P?

The absolute maximum input voltage is 6.5V, but the recommended operating range is 2.7V to 5.5V. Operation above 5.5V risks permanent damage even for brief transients, and exceeding 6.5V violates absolute maximum ratings per the datasheet. For 3.3V output, minimum valid input is 3.51V to maintain regulation at 2A load.

Does MP20046DQ-S-LF-P require an external pull-up resistor on the PG pin?

Yes - the PG pin is open-drain and requires an external pull-up resistor to a valid logic supply (e.g., 1.8V or 3.3V). Typical values range from 10kΩ to 100kΩ. Without pull-up, PG cannot assert high and will remain floating, preventing proper power-good signaling to microcontrollers or FPGAs.

Can MP20046DQ-S-LF-P operate without the SENSE pin connected?

Yes - the SENSE pin is optional. If unused, it must be tied directly to VOUT. Leaving it floating causes regulation instability and potential output voltage drift. When connected, SENSE improves load regulation accuracy by compensating for PCB trace resistance between the regulator and load.

What is the thermal resistance (θJA) of the QFN10 package in standard JEDEC 4-layer board conditions?

The measured θJA for MP20046DQ-S-LF-P in QFN10 (3×3mm) package is 60°C/W on a JEDEC JESD51-7 4-layer board. This value assumes the exposed thermal pad is fully soldered to a 1-in² copper area. Reducing θJA further requires additional thermal vias under the pad and connection to internal ground planes.

Is the EN pin active-high or active-low?

The EN pin is active-low: the device is enabled when EN is pulled low (≤0.4V), and disabled when EN is high (≥1.5V). Floating EN is prohibited - it must be tied to GND for always-on operation or driven by a logic signal. Internal EN leakage is ≤1μA, ensuring minimal impact on system power budget.

What output capacitor ESR range is supported for stable operation?

The MP20046DQ-S-LF-P is optimized for ceramic capacitors with ESR <1.5Ω. A 47μF X7R/X5R ceramic capacitor meeting this spec ensures stability across temperature and load. Higher-ESR capacitors (e.g., tantalum or aluminum electrolytic) may cause oscillation or degraded transient response and are not recommended.

How does the power-good (PG) output behave during thermal shutdown?

During thermal shutdown, the PG pin remains asserted (high) as long as VOUT stays within 78–86% of 3.3V. Only when VOUT collapses due to prolonged overheating - typically after sustained overload beyond thermal limits - does PG go low. PG is independent of thermal shutdown logic and responds solely to output voltage level.