Monolithic Power Systems Inc. MP2009EE-4.0-LF-Z

Overview

MP2009EE-4.0-LF-Z from Monolithic Power Systems is an ultra-low-noise, low-dropout linear regulator delivering 4.0V output at up to 120mA with ±1% accuracy over temperature, 120mV dropout at full load, and 16µV_RMS output noise (100Hz–30kHz) without external bypass capacitor. It uses an internal PMOS pass element, operates from 2.0V to 6.0V input, and targets noise-sensitive analog rails in RF and precision signal chains.

For engineers reviewing the MP2009EE-4.0-LF-Z datasheet, MP2009EE-4.0-LF-Z pinout, MP2009EE-4.0-LF-Z application, or MP2009EE-4.0-LF-Z equivalent, key selection criteria include dropout voltage at 120mA, PSRR at 1kHz (78dB), ground current (50µA), stability with 1µF ceramic output capacitor, and EN-controlled shutdown timing (150µs startup).

Technical Context

The MP2009EE-4.0-LF-Z implements a P-channel MOSFET pass transistor architecture that eliminates base-drive current, enabling 50µA no-load quiescent current and consistent low dropout across load and input conditions. Its internal 50pF noise-reduction structure achieves 16µV_RMS output noise without requiring external bypass capacitance.

It features active enable control (EN pin), thermal shutdown at 150°C with 20°C hysteresis, and current limiting set to 200mA typical at 4.0V output. Stability is guaranteed with 1µF ceramic output capacitors having ESR < 3Ω, supporting compact, high-density PCB layouts.

Key Specifications

Pinout & Package

MP2009EE-4.0-LF-Z is housed in a 5-pin SC70 package (2.0mm × 2.1mm × 0.95mm height), optimized for space-constrained portable designs. The package includes exposed pad for thermal enhancement (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6210B402MR-G and ADP125ARHZ-4.0-R7, MP2009EE-4.0-LF-Z uniquely balances 120mA capability, 16µV_RMS noise, and SC70-5 footprint - making it optimal for space-constrained, noise-critical 4.0V rails where current demand exceeds 100mA but stays below 125mA.

Availability

MP2009EE-4.0-LF-Z is available at Aetrix Electronics and suitable for cellular radios, wireless LAN modules, portable audio subsystems, and industrial sensor nodes requiring stable component supply with lead-free, RoHS-compliant packaging.

Supply support for MP2009EE-4.0-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 mixed-signal ICs for power management, motor drive, and automotive applications.

The MP2009 belongs to MPS's ultra-low-noise LDO product line, engineered specifically for RF, precision analog, and battery-powered systems where noise, dropout, and quiescent current directly impact system-level performance and runtime.

FAQ

What is the minimum input voltage required for MP2009EE-4.0-LF-Z to maintain regulation?

The MP2009EE-4.0-LF-Z requires a minimum input voltage of 4.11V to sustain 4.0V output at 120mA load, based on its 110mV dropout specification. Below this, output voltage drops linearly with input; operation below 2.0V input is prohibited per absolute maximum ratings.

Can MP2009EE-4.0-LF-Z operate without an output capacitor?

No - a minimum 1µF ceramic output capacitor is mandatory for stability across all loads, as confirmed in the datasheet's "Output Capacitor Selection" section. Omitting it causes oscillation and loss of regulation; ESR must remain below 3Ω for guaranteed stability.

Is the NC pin (Pin 4) safe to connect to ground?

Pin 4 is internally unconnected and must remain floating or be left unpopulated. Grounding it violates the recommended PCB layout and may induce parasitic coupling or thermal stress; the datasheet explicitly states "NC - No Connection" with no provision for external tie-off.

How does the EN pin behave during power-up?

The EN pin has 150µs startup delay - time from EN rising to 90% of final output voltage. It accepts logic-high ≥1.5V and logic-low ≤0.4V. If EN is tied to VIN, startup occurs immediately upon input application; floating EN is prohibited and may cause erratic behavior.

Does MP2009EE-4.0-LF-Z require a noise bypass capacitor?

No - the device integrates an internal 50pF bypass structure that achieves 16µV_RMS noise without external bypass capacitance. Adding one provides negligible improvement and consumes unnecessary board area, per the "New innovative design techniques" statement in the datasheet description.

What thermal derating applies above 25°C ambient?

At TA = 85°C, maximum power dissipation drops to 148mW (calculated via PD(MAX) = (125°C − 85°C)/260°C/W). For 4.0V output at 120mA, input must stay ≤4.5V to keep power below this limit; exceeding it triggers thermal shutdown at 150°C junction temperature.

Is MP2009EE-4.0-LF-Z compatible with 1.8V GPIO for enable control?

Yes - the EN pin logic-high threshold is specified as ≥1.5V at both 25°C and 85°C, and logic-low is ≤0.4V. A 1.8V GPIO meets the high-threshold requirement with 0.3V noise margin, ensuring reliable turn-on across temperature and process variation.