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

Overview

MP2009EE-1.8-LF-Z from Monolithic Power Systems is an ultra-low-noise, low-dropout linear regulator delivering 1.8V at up to 120mA with ±1% output accuracy, 16µV_RMS noise (100Hz–30kHz), and 120mV dropout at full load. It uses an internal PMOS pass element, consumes only 50µA quiescent current, and operates from 2.0V to 6.0V input - optimized for noise-sensitive RF and portable power rails such as VCO biasing.

For engineers reviewing the MP2009EE-1.8-LF-Z datasheet, MP2009EE-1.8-LF-Z pinout, MP2009EE-1.8-LF-Z application, or MP2009EE-1.8-LF-Z equivalent, key selection criteria include ultra-low noise performance without bypass capacitor, SC70 package footprint constraints, EN-controlled shutdown timing (150µs startup), and stability with 1µF ceramic output capacitance across all loads.

Technical Context

The MP2009EE-1.8-LF-Z implements a P-channel MOSFET pass transistor architecture with internal 1.2V bandgap reference and error amplifier, enabling near-zero base-drive loss and consistent low dropout across load and temperature. Its EN pin controls a dedicated enable logic filter that prevents false triggering during supply ramp-up.

It achieves 78dB PSRR at 1kHz and maintains stability with output capacitors as low as 1µF (ESR < 3Ω), leveraging an integrated 50pF noise-reduction capacitor structure - eliminating need for external noise-bypass components while preserving fast transient response (<10µs load step recovery).

Key Specifications

Pinout & Package

MP2009EE-1.8-LF-Z is housed in a 5-pin SC70 package (2.0mm × 1.25mm × 0.9mm), optimized for space-constrained PCB layouts in portable electronics. The package features exposed pad thermal enhancement and RoHS-compliant lead-free finish.

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 ADP125ARHZ-1.8-R7, MP2009EE-1.8-LF-Z uniquely balances ultra-low noise (16µV_RMS), EN control, SC70 footprint, and 1µF stability - making it optimal for miniaturized, battery-powered RF and precision analog systems where every µV and mm² matters.

Availability

MP2009EE-1.8-LF-Z is available at Aetrix Electronics and suitable for cellular baseband power, VCO bias supply, portable medical sensor nodes, and industrial wireless sensor transmitters requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for MP2009EE-1.8-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, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MP2009 belongs to MPS's ultra-low-noise LDO product line, engineered specifically for RF, wireless, and portable applications demanding minimal phase noise, compact size, and battery-friendly quiescent current.

FAQ

Is MP2009EE-1.8-LF-Z stable with 0.47µF ceramic output capacitance?

No. The MP2009EE-1.8-LF-Z is specified and tested for stability with ≥1µF ceramic output capacitance (ESR < 3Ω). Using 0.47µF violates the minimum capacitance requirement and may cause oscillation or poor transient response, especially under dynamic load conditions. Always use 1µF or higher per the datasheet.

What is the maximum allowable input voltage for continuous operation?

The absolute maximum input voltage is 6.5V, but the recommended operating range is 2.0V to 6.0V. Exceeding 6.0V risks exceeding thermal limits even at light loads due to increased power dissipation (P = (VIN − 1.8V) × IOUT), and may trigger thermal shutdown above ambient temperatures.

Does the NC pin require PCB routing or grounding?

No. Pin 4 is internally unconnected and electrically isolated. It may be left unconnected or optionally tied to GND for mechanical reinforcement - neither choice affects electrical performance. Do not route signals or power traces to this pin.

Can MP2009EE-1.8-LF-Z be used without an input capacitor?

No. A 1µF ceramic input capacitor is mandatory per the datasheet to ensure stability, reduce input ripple, and support fast line transient response. Omitting it risks oscillation, degraded PSRR, and potential damage during input voltage surges or hot-plug events.

How does thermal shutdown behave during sustained overload?

Thermal shutdown activates at TJ ≈ 150°C (typical) and disables the PMOS pass transistor. After cooling to ≈130°C (20°C hysteresis), the device automatically resumes regulation. This cycle repeats under sustained overload, limiting average power dissipation and preventing permanent damage.

Is the 16µVRMS noise specification measured at full load?

Yes - the 16µV_RMS noise value is specified at I_LOAD = 10mA (typical test condition), and increases only marginally to 17µV_RMS at 80mA. This confirms consistent low-noise performance across its operational load range, critical for maintaining SNR in precision analog stages.

What is the minimum EN pin pull-up resistance when driven by open-drain GPIO?

While the EN pin draws only 1µA (typ) bias current, a pull-up resistor ≤100kΩ is recommended to ensure reliable logic-high assertion (>1.5V) across temperature and process variation. Higher values risk marginal enable threshold margin, especially at elevated ambient temperatures.