Monolithic Power Systems Inc. MP2000DJ-ADJ-LF-P

Overview

MP2000DJ-ADJ-LF-P from Monolithic Power Systems is an adjustable-output, low-dropout bipolar linear regulator delivering up to 150mA with input voltage range 1.35V–6.0V and output adjustable from 0.5V to 5.0V. It features 300mV dropout at full load, ±3% output accuracy, and integrated thermal shutdown and current limit protection. Used in battery-powered cellular phones and low-current portable systems where ultra-low input voltage operation is critical.

For engineers reviewing the MP2000DJ-ADJ-LF-P datasheet, MP2000DJ-ADJ-LF-P pinout, MP2000DJ-ADJ-LF-P application, or MP2000DJ-ADJ-LF-P equivalent, key selection criteria include minimum input voltage (1.35V), adjustable feedback threshold (0.5V), shutdown quiescent current (7μA), thermal hysteresis (30°C), and TSOT23-5 package compatibility with space-constrained PCB layouts.

Technical Context

The MP2000DJ-ADJ-LF-P employs a PNP pass transistor architecture enabling operation down to 1.35V input-critical for single-cell Li-ion or NiMH battery systems. Its internal bandgap reference sets a precise 0.5V feedback threshold, allowing output configuration via external resistor divider without requiring fixed-voltage variants.

It integrates dual protection: current limit activation at 200mA (with VOUT = 1.2V) and thermal shutdown triggered at 145°C with 30°C hysteresis. Ground current scales linearly with load (2.7mA at 150mA), and PSRR reaches 50dB at 1kHz with 2.2μF output capacitance.

Key Specifications

Pinout & Package

MP2000DJ-ADJ-LF-P is housed in a 5-pin TSOT23-5 package (2.9mm × 1.6mm × 0.9mm), optimized for high-density portable PCBs with exposed thermal pad connection to GND plane for enhanced thermal dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-3302E/MB and TPS7A0512PDQNR, MP2000DJ-ADJ-LF-P uniquely balances ultra-low VIN capability (1.35V), adjustability, and thermal robustness-making it optimal for space-constrained, single-cell battery systems requiring flexible voltage rails and reliable overtemperature recovery.

Availability

MP2000DJ-ADJ-LF-P is available at Aetrix Electronics and suitable for cellular phone baseband power, wearable sensor nodes, industrial handheld meters, and medical patch monitors requiring stable component supply across extended temperature ranges (-40°C to +85°C) and long production lifecycles.

Supply support for MP2000DJ-ADJ-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, serving industrial, automotive, and consumer markets.

The MP2000 series targets ultra-low-voltage, low-quiescent-current linear regulation for portable electronics-designed specifically for battery-powered systems where input voltage may dip below 1.5V and board space is severely constrained.

FAQ

What is the minimum input voltage required for MP2000DJ-ADJ-LF-P to regulate a 0.5V output?

The MP2000DJ-ADJ-LF-P requires a minimum input voltage of 1.35V regardless of output setting. This is specified in the Absolute Maximum Ratings table and confirmed in the Recommended Operating Conditions section. At VOUT = 0.5V, the device maintains regulation as long as VIN ≥ 1.35V, leveraging its PNP pass element architecture.

How do I calculate the resistor values for a 1.8V output using the FB pin?

Use the formula VOUT = 0.5V × (1 + R1/R2). For 1.8V output, rearrange to R1/R2 = (1.8/0.5) − 1 = 2.6. Select R2 = 100kΩ, then R1 = 260kΩ (standard E96 value: 261kΩ). Total divider current (1.8V/360kΩ ≈ 5μA) stays well below FB bias current spec (<1μA), ensuring accuracy.

Does MP2000DJ-ADJ-LF-P require an output capacitor, and what type is recommended?

Yes, a minimum 2.2μF ceramic capacitor is required at the OUT pin for stability and transient response. The datasheet specifies compatibility with low-ESR X5R/X7R types; no series resistance or special dielectric is mandated. Place the capacitor within 2mm of the OUT and GND pins per the PCB Layout Guide.

What happens during thermal shutdown, and how does recovery work?

When junction temperature reaches 145°C, the device disables the pass transistor and halts output regulation. It remains latched off until temperature falls by 30°C (to ≤115°C), then automatically resumes operation. This hysteresis prevents oscillation near the trip point and is implemented entirely internally with no external components needed.

Can EN pin be left unconnected for always-on operation?

No-EN is an active-low enable pin with no internal pull-down. Leaving it floating risks undefined behavior due to noise coupling. For always-on operation, tie EN directly to GND. For controlled enable/disable, drive it with a logic signal referenced to the same GND plane.

Is MP2000DJ-ADJ-LF-P RoHS compliant and lead-free?

Yes-the "-LF" suffix explicitly denotes lead-free and RoHS-compliant packaging per MPS ordering nomenclature. The device meets JEDEC J-STD-020 moisture sensitivity level 1 and is qualified for reflow soldering up to 260°C peak temperature.

What is the maximum power dissipation in TSOT23-5 at 25°C ambient?

Maximum continuous power dissipation is calculated as PD(MAX) = (TJ(MAX) − TA)/θJA = (150°C − 25°C)/220°C/W = 0.57W. This assumes proper PCB copper area for heat spreading; actual achievable power depends on layout and airflow. Exceeding this causes thermal shutdown.