Monolithic Power Systems Inc. MP2019GN-33-Z

Overview

MP2019GN-33-Z from Monolithic Power Systems is a fixed-output 3.3V, 300mA low-dropout linear regulator with 3V–40V input range, 12–16µA quiescent current (at light load), ±2% output accuracy over temperature, and integrated power-good signaling with programmable delay. It serves as a primary voltage rail for ultra-low-power microcontrollers in battery-backed industrial sensors.

For engineers reviewing the MP2019GN-33-Z datasheet, MP2019GN-33-Z pinout, MP2019GN-33-Z application, or MP2019GN-33-Z equivalent, key selection criteria include dropout voltage at 300mA (480–640mV), thermal shutdown threshold (165°C), PG delay programmability via external capacitor, SOIC-8 EP thermal performance (θJA = 50°C/W), and compatibility with ≥0.47µF ceramic output capacitors.

Technical Context

The MP2019GN-33-Z implements a PMOS pass transistor architecture enabling low dropout and reverse-voltage protection awareness. Its internal 1.25V reference feeds a precision error amplifier that regulates output by controlling the gate of the pass device, with feedback taken directly from the FB pin tied to an internal 1.64MΩ/1MΩ resistor divider for the 3.3V version.

Power-good functionality uses a comparator monitoring FB voltage against 88–96% VFB thresholds, with open-drain PG output and externally programmable assertion delay (5–15ms) via PGDL pin charging current (3–9µA) and capacitor value. Thermal shutdown activates at 165°C with 30°C hysteresis, and current limiting trips at 600–1350mA peak.

Key Specifications

Pinout & Package

MP2019GN-33-Z is housed in a thermally enhanced SOIC-8 EP package with exposed pad soldered to PCB ground plane for optimal heat dissipation (θJC = 10°C/W). The exposed pad must be connected to GND for safe operation at full load.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6210B332MR-G and ADM7172ACPZ-3.3-R7, MP2019GN-33-Z uniquely balances 40V input tolerance, 12µA quiescent current, integrated PG/PGDL timing, and SOIC-8 EP thermal performance - making it optimal for space- and power-constrained 3.3V systems operating across harsh industrial voltage rails.

Availability

MP2019GN-33-Z is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body electronics, portable medical monitors, and smart utility meters requiring stable component supply across extended temperature and voltage ranges.

Supply support for MP2019GN-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 mixed-signal ICs for power management, motion control, and automotive applications.

The MP2019 product line targets ultra-low-power, wide-input-voltage linear regulation for battery-backed and high-voltage industrial systems - emphasizing quiescent current optimization, thermal robustness, and integrated power sequencing features.

FAQ

What is the minimum input voltage required for MP2019GN-33-Z to maintain regulation at 300mA?

The minimum input voltage is determined by dropout voltage: V_IN(MIN) = V_OUT + V_DROPOUT. At 300mA, typical dropout is 480–640mV, so V_IN(MIN) = 3.3V + 0.48V = 3.78V. This allows operation down to near end-of-discharge for single-cell Li-ion (3.0V–4.2V) and two-cell alkaline (2.0V–3.2V per cell).

Can MP2019GN-33-Z be used without connecting the PGDL pin?

Yes. If power-good delay timing is not required, the PGDL pin may be left floating. In that case, the PG signal asserts immediately upon V_FB reaching 92% of nominal (3.036V), with no intentional delay. The internal PGDL charging current remains inactive, and PG behavior defaults to standard fast-assertion mode.

Is an external feed-forward capacitor required for stable operation?

No. The MP2019GN-33-Z is stable with only a ≥0.47µF ceramic output capacitor. A 2.2nF feed-forward capacitor across the upper FB resistor (R1) is optional and improves high-frequency noise rejection - particularly beneficial for ADCs with >12-bit resolution - but adds no stability benefit for basic digital loads.

How should the exposed pad on the SOIC-8 EP package be handled in PCB layout?

The exposed pad must be soldered to a dedicated copper pour connected to the GND net. Use ≥4 thermal vias (0.3mm diameter) under the pad, each connected to an internal or bottom-layer ground plane. This achieves θJC ≈ 10°C/W and prevents thermal shutdown at full 300mA load in still-air conditions.

Does MP2019GN-33-Z support reverse input-to-output voltage conditions?

No. Due to the internal PMOS pass transistor's body diode, reverse current can flow from OUT to IN if V_OUT > V_IN (e.g., during backup battery hold-up). This current is unlimited and may damage the IC. An external Schottky diode (cathode to IN, anode to GND) is recommended to block reverse conduction.

What is the maximum allowable output capacitor value?

No maximum is specified. The MP2019GN-33-Z remains stable with output capacitors up to 22µF (X5R/X7R ceramic), and larger values improve load transient response. Capacitors beyond 22µF are acceptable but offer diminishing returns; avoid tantalum or aluminum electrolytics due to ESR sensitivity and aging effects.

How does the EN pin behave during power-up when connected directly to VIN?

When EN is tied to VIN, the regulator enables as soon as VIN exceeds the EN high threshold (1.8V). Startup is immediate with no delay, and the device enters regulation once internal biasing completes. This configuration eliminates external control logic and is standard for simple, always-on applications like sensor nodes.