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

Overview

MP20042DG-DD-LF-P from Monolithic Power Systems is a dual-channel, low-noise, high-PSRR linear regulator with 1.85V/1.85V fixed outputs, 200mA per channel, 11μV_RMS output noise, 72dB PSRR at 1kHz, and 114μA quiescent current (both channels active). It operates from 2.5V–6.0V input and targets battery-powered portable electronics requiring tight voltage regulation and ultra-low noise.

For engineers reviewing the MP20042DG-DD-LF-P datasheet, MP20042DG-DD-LF-P pinout, MP20042DG-DD-LF-P application, or MP20042DG-DD-LF-P equivalent, key selection criteria include dual independent enable control, PMOS pass transistor architecture, thermal shutdown at 140°C, dropout of 110mV at 100mA, and QFN8 (2mm × 2mm) package compatibility with space-constrained PCB layouts.

Technical Context

The MP20042DG-DD-LF-P integrates two independent PMOS-based LDOs with separate EN1/EN2 pins enabling channel-specific power sequencing and zero-current shutdown. Each regulator features internal current limiting (450mA trip), thermal protection with 10°C hysteresis, and stable operation with 0.47–10μF ceramic output capacitors.

Its architecture delivers fast transient response due to low output impedance and minimal dependency on external compensation-enabled by inherent stability over 0.47–10μF C_OUT with ESR < 1.2Ω-making it suitable for powering noise-sensitive RF and analog circuitry in compact wireless systems.

Key Specifications

Pinout & Package

MP20042DG-DD-LF-P uses a thermally enhanced 2mm × 2mm QFN8 package with exposed thermal pad (JEDEC MO-229 VCCD-3 compliant). Pin 4 is common GND; Pin 2 is shared VIN; Pins 1 and 8 are independent VOUT1/VOUT2; Pins 3 and 5 are active-high EN1/EN2; Pins 6–7 are no-connect.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6210B182MR-G and ADM7172ACPZ-R7, MP20042DG-DD-LF-P uniquely delivers matched dual 1.85V rails with independent enable control in a space-saving QFN8, balancing noise performance (11μV_RMS), PSRR (72dB), and ultra-low IQ (114μA) for battery-constrained dual-rail systems.

Availability

MP20042DG-DD-LF-P is available at Aetrix Electronics and suitable for cellular phones, handheld medical diagnostics, and industrial portable scanners requiring stable component supply across extended production lifecycles.

Supply support for MP20042DG-DD-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 design centers in the US, China, and Taiwan.

The MP20042 belongs to MPS's low-noise LDO portfolio, engineered specifically for portable and battery-operated equipment demanding ultra-low quiescent current, high PSRR, and dual-rail integration in minimal footprint.

FAQ

What is the maximum allowable input voltage for MP20042DG-DD-LF-P?

The absolute maximum input voltage is 6.5V, but the recommended operating range is 2.5V to 6.0V. Exceeding 6.5V risks permanent damage to the internal PMOS pass transistors and protection circuitry. For reliable long-term operation, maintain VIN ≤ 6.0V and ensure adequate thermal derating based on θJA = 80°C/W.

Can MP20042DG-DD-LF-P operate with ceramic output capacitors below 1μF?

Yes-MP20042DG-DD-LF-P is stable with ceramic capacitors as low as 0.47μF (X5R/X7R, ESR < 1.2Ω). This enables use in space-constrained designs where larger capacitors are impractical. However, values below 1μF may reduce load-transient immunity; verify stability under worst-case step-load conditions per Figure 5 in the datasheet.

Does MP20042DG-DD-LF-P require an external Schottky diode?

An external Schottky diode is recommended only if VOUT can exceed VIN by >0.3V (e.g., during hot-swap or backup-battery switchover). The internal PMOS body diode conducts under reverse bias; the Schottky (anode to VIN, cathode to VOUT) clamps reverse voltage to ~0.3V, preventing unintended current flow and potential system malfunction.

How does thermal shutdown behave during sustained overload?

When junction temperature reaches 140°C, both LDOs shut down simultaneously. After cooldown of 10°C (to 130°C), the device auto-restarts. This hysteresis prevents thermal oscillation. Under continuous overload, the device cycles between shutdown and restart-limiting average power dissipation but requiring external current limiting or derating to avoid reliability degradation.

Is the 1.85V output voltage trimmed at the factory?

Yes-MP20042DG-DD-LF-P has factory-trimmed 1.85V outputs with ±1% initial accuracy over temperature (-40°C to +85°C) and load (1mA–200mA). No external feedback resistors are required. The "DD" suffix in the part number explicitly denotes the 1.85V/1.85V configuration per MPS ordering guide.

What is the minimum recommended input capacitance?

A minimum 0.47μF ceramic capacitor is required on VIN, placed as close as possible to Pin 2. Larger values (e.g., 2.2μF) improve line-transient response but increase board area. Tantalum capacitors are acceptable alternatives, though ceramics are preferred for lower ESR and superior high-frequency filtering.

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

Yes-EN1 and EN2 may be paralleled and driven by one microcontroller GPIO to enable/disable both regulators simultaneously. Ensure the GPIO can sink/source sufficient current (EN input bias < 300nA) and that routing avoids noise coupling. For independent control (e.g., sequenced power-up), keep EN1/EN2 separate with individual pull-down resistors.