Monolithic Power Systems Inc. MP2018GZD-33-Z

Overview

MP2018GZD-33-Z from Monolithic Power Systems is a fixed 3.3V, 500mA low-dropout linear regulator with 10µA quiescent current, 3V–16V input range, and ±2% output voltage accuracy in TO252-5 package-designed for ultra-low-power microcontrollers and battery-powered medical imaging equipment.

For engineers reviewing the MP2018GZD-33-Z datasheet, MP2018GZD-33-Z pinout, MP2018GZD-33-Z application, or MP2018GZD-33-Z equivalent, key selection criteria include programmable power-good delay (via PGDL capacitor), thermal shutdown at 165°C, dropout voltage ≤700mV at 300mA, and stable operation with ≥0.47µF ceramic output capacitance.

Technical Context

The MP2018GZD-33-Z integrates an internal error amplifier, UVLO circuit, and open-drain power-good comparator with programmable delay via external capacitor on PGDL pin. Its LDO architecture delivers regulated 3.3V output with <15mV load regulation across 5mA–500mA and 57dB PSRR at 100Hz.

It features dual fault protection: current-limiting (900mA peak) and thermal shutdown with 30°C hysteresis (165°C trip, 135°C recovery), plus short-circuit protection. The exposed pad must be connected to GND for thermal performance and electrical integrity.

Key Specifications

Pinout & Package

MP2018GZD-33-Z uses the TO252-5 surface-mount package with exposed thermal pad (internally connected to GND). The pad must be soldered to a PCB ground plane for thermal management and electrical stability.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-output LDO regulator applications.

Compared with TPS7A0533PDBVR and ADM7172ACPZ-3.3-R7, MP2018GZD-33-Z uniquely balances ultra-low IQ (10µA), 500mA capability, and integrated programmable power-good timing - making it optimal for battery-constrained systems requiring autonomous rail validation.

Availability

MP2018GZD-33-Z is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data loggers, industrial handheld scanners, and automotive cabin sensors requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for MP2018GZD-33-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 MP2018 product line targets ultra-low-power, high-input-voltage LDO applications in battery-operated and harsh-environment systems-emphasizing minimal quiescent current, robust fault protection, and simplified layout requirements.

FAQ

What is the minimum output capacitor required for stability?

The MP2018GZD-33-Z is stable with a minimum 0.47µF X5R or X7R ceramic capacitor on the output. Larger values (e.g., 22µF) improve load transient response and reduce output ripple, but are not required for basic stability per the datasheet's bench characterization.

Can the PG pin drive a microcontroller GPIO directly?

Yes-the PG pin is an open-drain output rated for ≤15V and 1mA sink current. It can interface directly with 3.3V or 5V MCU GPIOs using a pull-up resistor (e.g., 100kΩ to VOUT); no level-shifting is needed for standard logic inputs.

How does the PGDL capacitor value affect power-on timing?

PGDL delay time (t_PGDL) scales linearly with capacitor value: t_PGDL ≈ (C_PGDL × 1.65V) / I_PGDL, where I_PGDL is 3–9µA. A 47nF capacitor yields ~11ms delay; doubling capacitance doubles the delay, enabling precise synchronization with downstream peripherals.

Is the exposed thermal pad electrically isolated?

No-the exposed pad is internally connected to GND. It must be soldered to a PCB ground plane for both thermal dissipation (θ_JA = 55°C/W) and electrical reference integrity. Floating or insulated pads will cause thermal runaway and regulation failure.

Does MP2018GZD-33-Z support reverse-polarity input protection?

No-MP2018GZD-33-Z has no built-in reverse-polarity protection. An external series Schottky diode or ideal diode controller is required if input polarity reversal is possible in the target application.

What is the maximum allowable power dissipation at 85°C ambient?

Using θ_JA = 55°C/W and T_J(MAX) = 150°C, maximum continuous power dissipation at T_A = 85°C is (150 − 85) / 55 ≈ 1.18W. This corresponds to ~350mA at 3.3V output with 13V input (PD = (13 − 3.3) × 0.35 ≈ 3.4W exceeds limit - derating required).

How accurate is the output voltage across temperature and load?

Output voltage remains within ±2% over −40°C to +125°C ambient and 5mA–500mA load, as verified in production testing. Load regulation contributes ≤15mV deviation; line regulation adds ≤10mV - both included in the ±2% total accuracy spec.