Monolithic Power Systems Inc. MP20042DG-ZS-LF-P

Overview

MP20042DG-ZS-LF-P from Monolithic Power Systems is a dual-channel, low-noise, high-PSRR linear regulator with fixed 5.0V and 3.3V outputs, ±1% accuracy, 200mA per channel output capability, 11μV_RMS output noise, and 72dB PSRR at 1kHz-designed for power-sensitive RF and digital subsystems in battery-powered wireless LAN modules.

For engineers reviewing the MP20042DG-ZS-LF-P datasheet, MP20042DG-ZS-LF-P pinout, MP20042DG-ZS-LF-P application, or MP20042DG-ZS-LF-P equivalent, key selection criteria include dual independent enable control (EN1/EN2), ultra-low quiescent current (114μA active, 0.03μA shutdown), fast load transient response with ≤2.2μF ceramic output capacitors, and thermal shutdown at 140°C with 10°C hysteresis.

Technical Context

The MP20042DG-ZS-LF-P integrates two independent PMOS-based LDO regulators sharing a common input and ground, each with dedicated enable inputs and output voltage set by internal trimming. Its architecture delivers low dropout (110mV @100mA) and high channel-to-channel isolation (>150dB at 100Hz) without external feedback resistors.

It operates across 2.5V–6.0V input while maintaining regulation down to 100mV headroom, supports simultaneous or independent channel shutdown, and includes per-channel current limiting (450mA trip) and junction-temperature–triggered thermal protection with automatic recovery.

Key Specifications

Pinout & Package

MP20042DG-ZS-LF-P is housed in a thermally enhanced 2mm × 2mm QFN-8 package with exposed thermal pad (JEDEC MO-229 VCCD-3 compliant). The package supports high-density layout and efficient heat dissipation via PCB copper pour under the exposed pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6223D533MR-G and ADM7154ACPZ-5.0-R7, MP20042DG-ZS-LF-P uniquely combines dual independent enables, 200mA/channel drive, and sub-12μV_RMS noise in a single 2mm×2mm package-enabling compact, high-performance dual-rail power without compromise.

Availability

MP20042DG-ZS-LF-P is available at Aetrix Electronics and suitable for wireless LAN modules, portable medical sensors, and industrial handheld terminals requiring stable component supply with guaranteed long-term sourcing and RoHS-compliant packaging.

Supply support for MP20042DG-ZS-LF-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 core expertise in DC/DC converters, LDOs, and motor drivers.

The MP20042 belongs to MPS's ultra-low-noise LDO product line, engineered specifically for noise-critical RF, portable, and battery-operated applications where PSRR, quiescent current, and small footprint are decisive.

FAQ

What are the exact output voltages of MP20042DG-ZS-LF-P?

The MP20042DG-ZS-LF-P has factory-set outputs: VOUT1 = 5.0V and VOUT2 = 3.3V, trimmed to ±1% accuracy across temperature and load. These values are fixed and not adjustable via external resistors-confirmed in the Ordering Information table of the Rev. 0.9 datasheet.

Can MP20042DG-ZS-LF-P operate with a 2.7V input while regulating 3.3V output?

No. With a 3.3V output, the minimum required input is VOUT + dropout voltage. At 100mA load, dropout is 110mV; thus, minimum input is 3.41V. At 200mA, dropout rises to 250mV, requiring ≥3.55V input. A 2.7V input cannot sustain 3.3V regulation.

Is the exposed thermal pad electrically connected internally?

Yes-the exposed pad is internally connected to GND. Per the Package Information drawing and PCB Layout Guide, it must be soldered to a large PCB ground plane to ensure thermal performance and electrical stability. Floating or unconnected pads cause thermal derating and potential malfunction.

What is the maximum allowable input voltage for continuous operation?

The absolute maximum input voltage is 6.5V, but the recommended operating range is 2.5V to 6.0V. Exceeding 6.0V risks violating safe operating area limits-even briefly-as confirmed in the Absolute Maximum Ratings table (page 3) and Thermal Protection section.

Does MP20042DG-ZS-LF-P require external compensation components?

No. The MP20042DG-ZS-LF-P is internally compensated and stable with ceramic output capacitors from 0.47μF to 10μF and ESR <1.2Ω. The datasheet explicitly states "no external compensation required" in the Output Capacitor Selection section (page 7).

How does the current limit behave during overload?

Each channel features independent current limiting that clamps output current at ~450mA (typical) when load exceeds 200mA. This is not foldback-it maintains constant current until thermal shutdown activates at 140°C, as verified in Electrical Characteristics (page 4) and Operation section (page 6).

Can EN1 and EN2 be tied together and driven by a single GPIO?

Yes-EN1 and EN2 may be paralleled and driven by one logic signal to enable/disable both outputs simultaneously. However, doing so forfeits independent rail control. The datasheet confirms this is electrically permissible, as each EN pin draws only 300nA bias current (page 4).