Monolithic Power Systems Inc. MP2009EE-1.8-LF-P

Overview

MP2009EE-1.8-LF-P from Monolithic Power Systems is an ultra-low-noise, low-dropout linear regulator delivering 1.8V at up to 120mA with ±1% output voltage accuracy, 16µV_RMS output noise (100Hz–30kHz), and 120mV dropout at full load. It uses an internal PMOS pass element, consumes only 50µA quiescent current at no load, and operates from 2.0V to 6.0V input-optimized for powering noise-sensitive analog circuitry in portable RF systems.

For engineers reviewing the MP2009EE-1.8-LF-P datasheet, MP2009EE-1.8-LF-P pinout, MP2009EE-1.8-LF-P application, or MP2009EE-1.8-LF-P equivalent, key selection criteria include ultra-low noise performance without bypass capacitors, PSRR of 78dB at 1kHz, stability with 1µF ceramic output capacitance, and EN-controlled shutdown functionality in space-constrained designs.

Technical Context

The MP2009EE-1.8-LF-P implements a PMOS-based LDO architecture with internal 1.2V bandgap reference and error amplifier feedback loop. Its dropout behavior is governed by the R_DS(on) of the integrated P-channel MOSFET, enabling predictable low-dropout operation across temperature and load.

It features active EN control with logic-compatible thresholds (V_EN(H) = 1.5V min, V_EN(L) = 0.4V max), thermal shutdown at 150°C with 20°C hysteresis, and independent current limiting (130–300mA depending on V_OUT). No external compensation is required due to internal stability optimization for 1µF ceramic output capacitors.

Key Specifications

Pinout & Package

MP2009EE-1.8-LF-P is housed in a 5-pin SC70 package (2.0mm × 1.25mm × 0.9mm height), optimized for high-density PCB layouts and thermal performance via exposed pad grounding (per MPS EVB layout guidelines).

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6210B182MR-G and ADP125ARZ-1.8-R7, MP2009EE-1.8-LF-P uniquely balances ultra-low noise (16µV_RMS), SC70 footprint, and 120mA capability-making it optimal for space-constrained, battery-powered RF and precision analog systems where noise-induced jitter or offset drift must be minimized.

Availability

MP2009EE-1.8-LF-P is available at Aetrix Electronics and suitable for cellular radios, Bluetooth accessories, digital cameras, and portable medical sensors requiring stable component supply with guaranteed long-term sourcing.

Supply support for MP2009EE-1.8-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 power ICs, with design centers across Asia and North America and global manufacturing partnerships.

The MP2009 series belongs to MPS's ultra-low-noise LDO product line, engineered specifically for powering noise-sensitive RF and precision analog circuits in battery-operated portable electronics-prioritizing PSRR, output noise, and small-footprint thermal efficiency.

FAQ

What is the minimum input voltage required for MP2009EE-1.8-LF-P to maintain regulation at full 120mA load?

The device requires VIN ≥ VOUT + dropout voltage. At 120mA and 1.8V output, dropout is 172mV (typ), so minimum input is 1.972V. The absolute minimum operating input is 2.0V per datasheet specifications, ensuring reliable start-up and regulation across temperature and process variation.

Can MP2009EE-1.8-LF-P operate without an output capacitor?

No. A minimum 1µF ceramic output capacitor is required for stability across all loads and temperatures. The datasheet explicitly states stability is guaranteed only with ≥1µF ceramic capacitor (ESR < 3Ω); omitting it risks oscillation and output voltage collapse under dynamic load conditions.

Is the NC pin (Pin 4) internally connected or should it be left unconnected on the PCB?

Pin 4 is a true no-connect terminal with no internal bond wire or silicon connection. It must remain unconnected on the PCB-no trace, pad, or solder should be attached. Floating or grounding this pin may compromise package integrity or thermal performance per MPS layout guidance.

How does the EN pin behave during power-up, and what is the startup delay time?

The EN pin is active-high with logic thresholds of 1.5V (min high) and 0.4V (max low). Startup delay-the time from EN rising to 90% of final VOUT-is 150µs (typ) with 50Ω load, enabling fast, deterministic power sequencing in multi-rail systems without external timing components.

Does MP2009EE-1.8-LF-P require a specific PCB layout for thermal management?

Yes. Per MPS Application Note and EVB guidelines, the GND pin must connect to a large copper pour for heat dissipation. The SC70 package's thermal resistance is θ_JA = 260°C/W on a 4-layer board; inadequate ground plane area will cause junction temperature to exceed 125°C under sustained 120mA load, triggering thermal shutdown.

What is the maximum allowable power dissipation for MP2009EE-1.8-LF-P at 85°C ambient temperature?

Using θ_JA = 260°C/W and T_J(MAX) = 125°C, maximum power dissipation is PD_MAX = (125°C − 85°C) / 260°C/W = 154mW. At 1.8V output and 120mA, power dissipation is (VIN − 1.8V) × 0.12A; thus VIN must stay ≤ 3.08V to remain within safe thermal limits at 85°C ambient.