Monolithic Power Systems Inc. MP2019GN-5-P

Overview

MP2019GN-5-P from Monolithic Power Systems is a 40V-input, 300mA adjustable/fixed-output linear regulator with 10µA quiescent current, 5V fixed output (±2% accuracy), SOIC-8 EP package, and integrated power-good signaling with programmable delay. It powers ultra-low-power microcontrollers in battery-backed industrial sensors and automotive body electronics where input voltage may reach 40V.

For engineers reviewing the MP2019GN-5-P datasheet, MP2019GN-5-P pinout, MP2019GN-5-P application, or MP2019GN-5-P equivalent, key selection criteria include dropout voltage at 300mA (480–640mV), thermal shutdown threshold (165°C), PG delay programmability via external capacitor, FB reference voltage (1.25V), and compatibility with low-ESR ceramic capacitors ≥0.47µF.

Technical Context

The MP2019GN-5-P uses a PMOS pass transistor architecture enabling low dropout and reverse-voltage protection awareness. Its internal 1.25V bandgap reference feeds an error amplifier that regulates output by controlling the pass device gate, with feedback taken directly from the FB pin for adjustable versions or internally routed for fixed outputs like the -5 variant.

Power-good functionality is implemented via an open-drain MOSFET whose state depends on FB voltage relative to 88–96% of nominal VFB; PGDL pin charges a capacitor to set assertion delay (5–15ms typical with 47nF), while EN enables digital on/off control with 0.3V/1.8V logic thresholds and sub-1µA shutdown current.

Key Specifications

Pinout & Package

MP2019GN-5-P is housed in a thermally enhanced SOIC-8 EP (exposed pad) package measuring 5.0mm × 6.2mm × 1.7mm, with θJA = 50°C/W on a 4-layer PCB. The exposed pad must be soldered to a solid ground plane for effective thermal dissipation and EMI reduction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2019GN-5-P, the TPS7B6750QPWPRQ1 adds automotive qualification and diagnostics at higher IQ and cost, while the NCV8664ST50T3G trades current capability and PG functionality for extended temperature tolerance and simpler implementation.

Availability

MP2019GN-5-P is available at Aetrix Electronics and suitable for industrial automation controllers, automotive body electronics, and medical diagnostic devices requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for MP2019GN-5-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.

The MP2019 product line targets high-input-voltage, ultra-low-power linear regulation for battery-backed and automotive systems, emphasizing wide VIN range, minimal quiescent current, and integrated system-level features like power-good and programmable delay.

FAQ

What is the minimum input voltage required for MP2019GN-5-P to regulate 5V output?

The MP2019GN-5-P requires a minimum input voltage of 5.48V to maintain regulation at 300mA load, based on its maximum dropout voltage of 640mV. At lighter loads, regulation begins at VIN ≥ 5.1V due to lower dropout (480mV typical). Below 3V, the internal UVLO circuit prevents startup entirely.

Can the MP2019GN-5-P be used with ceramic output capacitors smaller than 1µF?

Yes - the MP2019GN-5-P is stable with output ceramic capacitors as low as 0.47µF (X5R/X7R dielectric), per datasheet specification. Using smaller values may degrade load transient response and increase output ripple, but does not compromise stability. Avoid Y5V or Z5U types due to capacitance drift with temperature and bias.

How is the power-good delay time calculated for MP2019GN-5-P?

The PG delay time t_PGDL (in ms) is calculated using t_PGDL = (C_PGDL × V_{th_PGDL}) / I_PGDL, where C_PGDL is the capacitor value in nF, V_{th_PGDL} = 1.7V, and I_PGDL = 5.5µA (typical). For example, a 47nF capacitor yields ~14.5ms delay. Values between 5–15ms are achievable with 22–100nF capacitors.

Is the FB pin left floating or grounded in the MP2019GN-5-P fixed-output variant?

In the MP2019GN-5-P, the FB pin is internally connected to the fixed 5V output divider and must be left unconnected (NC) on the PCB. Connecting FB to GND, VIN, or any external node will disrupt regulation and may cause malfunction or damage. The datasheet explicitly states FB is "not used" in fixed-output versions.

Does MP2019GN-5-P provide reverse-voltage protection on its own?

No - the MP2019GN-5-P lacks internal reverse-voltage protection. Its PMOS pass transistor includes a body diode that conducts from OUT to IN if VOUT > VIN, potentially causing destructive reverse current. External protection (e.g., Schottky diode in series with VIN or ideal diode controller) is required in applications where output voltage may exceed input, such as backup battery scenarios.

What is the thermal resistance (θJC) of the SOIC-8 EP package for MP2019GN-5-P?

The junction-to-case thermal resistance (θJC) for the MP2019GN-5-P in SOIC-8 EP package is 10°C/W, measured from die junction to the exposed pad surface per JESD51-7 standard on a 4-layer PCB. This value assumes full solder coverage of the exposed pad to a dedicated thermal plane, enabling efficient heat transfer to the PCB.

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

When EN is tied directly to VIN, the MP2019GN-5-P initiates soft-start automatically once VIN rises above the 3V UVLO threshold. Startup is synchronized to input ramp rate, with output rising in ~1ms (10% to 90%) under typical 500Ω load and 22µF output capacitance. No external pull-up or timing components are needed for basic enable functionality.