Monolithic Power Systems Inc. MP20042DG-JG-LF-Z

Overview

MP20042DG-JG-LF-Z from Monolithic Power Systems is a dual-channel, low-noise, high-PSRR linear regulator with fixed 2.5V and 1.8V outputs, 1% accuracy, 200mA per channel, 11μVRMS output noise, and 72dB PSRR at 1kHz-designed for battery-powered wireless LAN and handheld devices requiring stable dual-rail power.

For engineers reviewing the MP20042DG-JG-LF-Z datasheet, MP20042DG-JG-LF-Z pinout, MP20042DG-JG-LF-Z application, or MP20042DG-JG-LF-Z equivalent, key selection criteria include dual independent enable control, ultra-low quiescent current (114μA), fast load transient response with 2.2μF ceramic output capacitors, and thermal shutdown at 140°C.

Technical Context

The MP20042 integrates two independent PMOS-based LDOs with separate EN1/EN2 inputs, enabling asynchronous channel control and near-zero shutdown current (≤1μA). Each regulator features internal current limiting (450mA trip) and thermal foldback protection triggered at 140°C with 10°C hysteresis.

Its architecture delivers low dropout (110mV at 100mA), high AC PSRR (72dB @1kHz), and excellent line/load regulation (±0.05%/V and ±1%), optimized for operation from 2.5V–6.0V input across –40°C to +85°C ambient.

Key Specifications

Pinout & Package

MP20042DG-JG-LF-Z is housed in a thermally enhanced 2mm × 2mm QFN-8 package with exposed thermal pad (JEDEC MO-229 VCCD-3 compliant). Pin 4 is common GND; pins 6 and 7 are no-connect (NC); the exposed pad must be soldered to PCB ground for thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6223D251MR-G and RT9013-25GB, MP20042DG-JG-LF-Z uniquely integrates two precision, low-noise, independently enabled LDOs in one 2mm×2mm package-reducing solution size by >40%, eliminating inter-rail coupling risks, and enabling true dual-rail power management with single-component sourcing.

Availability

MP20042DG-JG-LF-Z is available at Aetrix Electronics and suitable for wireless LAN modules, battery-powered IoT sensors, and handheld medical devices requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.

Supply support for MP20042DG-JG-LF-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, serving industrial, automotive, and consumer markets.

The MP20042 belongs to MPS's low-noise, high-PSRR LDO product line-engineered specifically for battery-constrained, noise-sensitive applications such as wireless communications, portable instrumentation, and ultra-low-power embedded systems.

FAQ

What are the exact output voltages programmed in MP20042DG-JG-LF-Z?

The MP20042DG-JG-LF-Z is factory-configured with fixed 2.5V on VOUT1 and 1.8V on VOUT2, as confirmed by the ordering guide (top marking "7E") and electrical characteristics table. These values are trimmed during production and cannot be adjusted externally via resistors or pins.

Can MP20042DG-JG-LF-Z operate with input voltage below 2.5V?

No. The absolute minimum recommended input voltage is 2.5V per the datasheet's Recommended Operating Conditions. At 2.5V input, the 2.5V rail has zero headroom and will drop out; practical operation requires ≥2.6V for VOUT1 and ≥1.9V for VOUT2 to maintain regulation.

Is the exposed thermal pad internally connected to GND?

Yes-the exposed pad is electrically tied to the internal GND plane and must be soldered to a PCB ground pour. This connection is essential for thermal performance (θJA = 80°C/W) and electrical stability; omitting it risks thermal shutdown and output inaccuracy.

Does MP20042DG-JG-LF-Z require external compensation components?

No. The MP20042 is internally compensated and stable with 0.47μF–10μF ceramic output capacitors (ESR < 1.2Ω). No external resistors, capacitors, or feedback networks are needed-simplifying layout and reducing BOM count.

What happens if EN1 and EN2 are left floating?

Leaving EN1 or EN2 floating violates the Absolute Maximum Ratings and may cause unpredictable output behavior, including partial turn-on, oscillation, or excessive quiescent current. The datasheet explicitly states "Do Not Float This Pin"-each EN pin must be actively driven high or low, or tied to VIN/GND.

How does the internal PMOS pass element affect reverse current protection?

The internal PMOS creates a parasitic body diode from VOUT to VIN. If VOUT exceeds VIN by >0.3V (e.g., during hot-swap or backup battery scenarios), this diode conducts. An external Schottky diode (anode to VOUT, cathode to VIN) is required to block reverse current and prevent misoperation.

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

Using θJA = 80°C/W and TJ(MAX) = 125°C, maximum continuous power dissipation at TA = 85°C is (125 − 85)/80 = 0.5W. Exceeding this causes thermal shutdown. Derating is required above 25°C ambient; full 1.25W rating applies only at TA = 25°C with proper PCB thermal design.