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

Overview

MP20042DG-ZS-LF-Z 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, and 11μV_RMS output noise-designed for power-sensitive RF and digital subsystems in battery-powered wireless LAN devices.

For engineers reviewing the MP20042DG-ZS-LF-Z datasheet, MP20042DG-ZS-LF-Z pinout, MP20042DG-ZS-LF-Z application, or MP20042DG-ZS-LF-Z equivalent, key selection criteria include dual independent enable control (EN1/EN2), 72dB PSRR at 1kHz, 110mV dropout at 100mA, thermal shutdown at 140°C, and QFN8 (2mm × 2mm) package compatibility with space-constrained portable PCB layouts.

Technical Context

The MP20042DG-ZS-LF-Z integrates two independent PMOS-based LDO regulators sharing a common input and ground, each with dedicated active-high enable pins (EN1, EN2) enabling selective channel shutdown to minimize system quiescent current. Its internal architecture eliminates body diode reverse-current conduction risk via external Schottky protection guidance.

It operates across 2.5V–6.0V input range while maintaining regulation down to 110mV dropout (at 100mA) and delivers stable 5.0V/3.3V outputs with <±1% initial accuracy and <±0.25% variation over –40°C to +85°C ambient temperature.

Key Specifications

Pinout & Package

MP20042DG-ZS-LF-Z is housed in a thermally enhanced 2mm × 2mm QFN8 package with exposed thermal pad (JEDEC MO-229 VCCD-3 compliant). The package supports high-density routing and efficient heat dissipation when soldered to a multi-layer PCB with solid ground plane connection to Pin 4 (GND) and the exposed paddle.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6223D503MR-G and RP132L503B-TR-F, MP20042DG-ZS-LF-Z delivers superior noise/PSRR performance and lower dropout-enabling longer battery life and cleaner RF operation-without increasing footprint or BOM count.

Availability

MP20042DG-ZS-LF-Z is available at Aetrix Electronics and suitable for wireless LAN transceivers, laptop subsystems, and battery-powered instrumentation requiring stable component supply, consistent top-marking (7L), and RoHS-compliant QFN8 packaging.

Supply support for MP20042DG-ZS-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, and global manufacturing partnerships.

The MP20042 belongs to MPS's micropower LDO product line, engineered specifically for ultra-low-noise, high-PSRR dual-rail regulation in space- and power-constrained portable electronics.

FAQ

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

The MP20042DG-ZS-LF-Z has factory-trimmed fixed outputs: Channel 1 delivers 5.0V ±1%, and Channel 2 delivers 3.3V ±1%. These values are laser-trimmed during production and require no external resistors-ensuring consistent performance across units and eliminating layout variability.

Can MP20042DG-ZS-LF-Z operate from a 2.7V input while maintaining 3.3V output?

No. With a 3.3V output, the minimum input voltage is determined by dropout: 3.3V + 110mV = 3.41V at 100mA load. At 200mA, dropout rises to 250mV, requiring ≥3.55V input. A 2.7V source cannot sustain regulation on either channel.

Is an external Schottky diode mandatory for reverse-voltage protection?

Yes-if V_OUT can exceed V_IN by >0.3V (e.g., during hot-swap or battery swap), the internal PMOS body diode conducts. An external Schottky (e.g., BAT54) across VIN–VOUT2 prevents this, avoiding unintended current flow and potential damage to upstream sources.

What is the recommended output capacitor ESR range for stable operation?

The MP20042DG-ZS-LF-Z is optimized for ceramic capacitors with ESR <1.2Ω. Stability is guaranteed for 0.47μF–10μF capacitance. Avoid tantalum or aluminum electrolytics-their higher ESR risks oscillation and degraded transient response.

How does thermal shutdown behave during continuous overload?

At junction temperatures ≥140°C, both LDOs shut down simultaneously. After cooldown to ≤130°C (10°C hysteresis), regulation resumes automatically. This cycle repeats until fault condition clears-protecting die integrity without latch-off or manual reset.

Does EN1/EN2 require pull-up resistors when driven by open-drain GPIO?

Yes. Since EN pins are active-high and have 300nA max input bias current, an external 100kΩ pull-up to VIN is required when interfaced with open-drain drivers. Floating EN pins cause undefined output states and potential shoot-through or excessive quiescent current.

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

Using θ_JA = 80°C/W: P_MAX = (125°C − 85°C) / 80°C/W = 0.5W. For example, at VIN = 4.2V and VOUT2 = 3.3V delivering 200mA, power dissipated is (4.2−3.3)×0.2 = 0.18W-well within safe limit with proper PCB copper area.