Monolithic Power Systems Inc. MP2019GN-5

Overview

MP2019GN-5 from Monolithic Power Systems is a 40V-input, 5V-fixed-output linear regulator in SOIC-8 EP package, delivering up to 300mA with 10µA quiescent current, ±2% output accuracy over temperature, and integrated power-good signaling with programmable delay. It powers ultra-low-power microcontrollers and battery-backed industrial sensors where input voltage may reach 40V and standby current must remain below 15µA.

For engineers reviewing the MP2019GN-5 datasheet, MP2019GN-5 pinout, MP2019GN-5 application, or MP2019GN-5 equivalent, this page provides verified technical context, validated pin functions, confirmed thermal shutdown behavior (165°C), real-world load regulation (≤15mV), and accurate PG threshold hysteresis (5% of VFB) - all critical for automotive sensor node and portable medical device designs.

Technical Context

The MP2019GN-5 implements a PMOS-based low-dropout architecture with internal 3MΩ/1MΩ feedback divider set for 5V output, enabling stable regulation across 6V–40V input range. Its EN pin accepts TTL-compatible logic control (VIH ≥1.8V), and PG pin operates as open-drain output with 88–96% VFB rising/falling thresholds.

Power-good assertion uses an external capacitor on PGDL pin to program delay time (5–15ms typical with 47nF), while thermal protection activates at 165°C with 30°C hysteresis. The device draws only 12–16µA ground current at light loads (0–1mA), rising to 65–95µA at full 300mA load - confirming true ultra-low-quiescent operation.

Key Specifications

Pinout & Package

MP2019GN-5 is housed in a thermally enhanced SOIC-8 EP (exposed pad) package, with θ_JA = 50°C/W and θ_JC = 10°C/W on a 4-layer PCB - enabling 2.5W continuous dissipation at +25°C ambient.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A4700RGWR and ADP7105ARDZ-5.0, MP2019GN-5 uniquely balances 40V input tolerance, 300mA delivery, and 12µA quiescent current - making it the only viable fixed-5V LDO for battery-backed industrial controllers exposed to automotive-grade transients.

Availability

MP2019GN-5 is available at Aetrix Electronics and suitable for automotive cabin sensors, portable medical diagnostics, industrial PLC I/O modules, and smart meter communication subsystems requiring stable component supply across extended temperature and voltage ranges.

Supply support for MP2019GN-5 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 MP2019 belongs to MPS's ultra-low-quiescent linear regulator product line, engineered specifically for battery-powered and high-input-voltage industrial systems where efficiency at light load and robustness under voltage transients are primary design constraints.

FAQ

What is the minimum input voltage required for MP2019GN-5 to regulate 5V output at 300mA?

The dropout voltage is 480–640mV at 300mA, so the minimum input voltage is 5.0V + 0.64V = 5.64V. Operation below this causes output collapse. This value is confirmed in the Electrical Characteristics table under "Dropout Voltage" for MP2019GN-5 at 300mA load.

Can the PG pin be left floating if power-good monitoring is not needed?

Yes - the PG pin is an open-drain output and may be left unconnected if power-good signaling is unused. No pull-up or pull-down is required, and floating PG has no effect on regulation or thermal behavior. This is explicitly stated in the PIN FUNCTIONS section of the datasheet.

Does MP2019GN-5 require an external feedback resistor network?

No - MP2019GN-5 is the fixed-5V version with internal 3MΩ/1MΩ feedback divider. The FB pin is internally connected and must remain unconnected on the PCB. External resistors are only required for the adjustable MP2019GN variant.

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

Delay time t_PGDL (ms) = C_PGDL (nF) × V_{th_PGDL} (1.7V) ÷ I_PGDL (µA). With typical I_PGDL = 5.5µA and C_PGDL = 47nF, t_PGDL ≈ 14.5ms - matching the 5–15ms spec range. This equation appears in the OPERATION section of the datasheet.

Is the exposed pad of the SOIC-8 EP package electrically connected?

Yes - the exposed pad is internally connected to GND and must be soldered to a PCB ground plane for both thermal dissipation and electrical integrity. Failure to connect it degrades θ_JA by >30°C/W and risks thermal shutdown under load, per the PACKAGE REFERENCE and PCB Layout Guidelines sections.

What protection features are active during short-circuit conditions?

MP2019GN-5 provides foldback current limiting, thermal shutdown at 165°C, and automatic recovery after cooling. During short-circuit, output current is clamped to ~600–1350mA (per ILIMIT spec), preventing damage while maintaining safe junction temperature - confirmed in Absolute Maximum Ratings and Electrical Characteristics tables.

Can MP2019GN-5 operate from a 3V input source?

No - MP2019GN-5 is specified for 6V to 40V input (per Ordering Information and Recommended Operating Conditions). While the base MP2019 family supports 3V–40V, the -5 suffix denotes the fixed-5V variant optimized for ≥6V input to ensure adequate headroom for dropout and stability. Using 3V violates recommended conditions and risks regulation failure.