Monolithic Power Systems Inc. MPM3805AGQBE-AEC1-P

Overview

MPM3805AGQBE-AEC1-P from Monolithic Power Systems is an AEC-Q100 qualified, synchronous step-down DC/DC power module integrating MOSFETs and a 0.47µH inductor in a QFN-12 package. It delivers up to 0.6A peak output current from 2.6V–6V input, regulates output down to 0.6V with ±1.5% load regulation, and features constant-on-time (COT) control for fast transient response-used in automotive rear camera modules and telematics ECUs.

For engineers reviewing the MPM3805AGQBE-AEC1-P datasheet, MPM3805AGQBE-AEC1-P pinout, MPM3805AGQBE-AEC1-P application, or MPM3805AGQBE-AEC1-P equivalent, key selection criteria include its AEC-Q100 qualification, integrated inductor enabling <6mm² total solution size, 1.5ms soft-start, power-good signaling, and forced CCM operation across automotive temperature range (−40°C to +125°C).

Technical Context

The MPM3805AGQBE-AEC1-P implements constant-on-time (COT) control with input voltage feed-forward, maintaining stable switching frequency (2.8–4.2 MHz) across 2.6V–6V input and 0.6V–VIN output ranges. Its internal high-side FET (120–180 mΩ R_DS(ON)) and low-side FET (70–140 mΩ) operate in forced continuous conduction mode (FCCM), eliminating diode conduction loss and supporting 100% duty cycle in dropout.

Fault protection includes cycle-by-cycle over-current detection (typ. 2.1A P-FET limit), hiccup-mode short-circuit recovery, thermal shutdown at 150°C with 30°C hysteresis, and precise power-good monitoring (±10% V_FB window, 50 µs delay). EN logic thresholds (1.2V high / 0.4V low) and internal 1MΩ pull-down enable robust power sequencing in automotive systems.

Key Specifications

Pinout & Package

MPM3805AGQBE-AEC1-P uses a thermally enhanced QFN-12 package (2.5mm × 3.0mm × 0.9mm) with exposed thermal pad on underside. The package integrates power MOSFETs, controller, and 0.47µH shielded inductor, reducing BOM count and layout complexity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar automotive-grade synchronous buck module applications.

Compared with TPS62097QDSGRQ1 and LMZ36002QRNXTQ1, the MPM3805AGQBE-AEC1-P offers the smallest footprint (6mm²), lowest profile (0.9mm), and simplest BOM (four external components), making it optimal for space-constrained automotive vision and connectivity modules where 0.6A is sufficient.

Availability

MPM3805AGQBE-AEC1-P is available at Aetrix Electronics and suitable for automotive rear camera modules, telematics control units, eCall systems, and infotainment domain controllers requiring stable component supply across extended temperature and AEC-Q100-compliant production lifecycles.

Supply support for MPM3805AGQBE-AEC1-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 over 20 years of leadership in DC/DC conversion, motor drivers, and LED lighting solutions.

The MPM3805A product line delivers compact, AEC-Q100-qualified power modules targeting automotive ADAS sensors, infotainment systems, and body electronics-designed to replace discrete buck converters while meeting stringent size, thermal, and reliability requirements.

FAQ

What is the maximum ambient temperature at which MPM3805AGQBE-AEC1-P can deliver 0.6A continuously?

At 25°C ambient, the device delivers 0.6A continuously. Derating begins above 60°C ambient due to thermal limits; at 105°C ambient, maximum continuous output drops to ~0.35A. Full 0.6A operation is guaranteed up to +85°C ambient with 2-layer PCB and 1-in² copper pour under the thermal pad, per Figure 6 in the datasheet.

Can OUT_S be left unconnected if remote sensing is not required?

Yes. OUT_S is optional: if unused, it must be tied directly to the OUT pin (not left floating) to maintain regulation accuracy. Leaving it open causes unstable feedback and potential output overvoltage. When connected to the load, it compensates for up to 150mV IR drop in output traces.

Does the MPM3805AGQBE-AEC1-P support dynamic output voltage adjustment during operation?

No. Output voltage is set statically by the FB resistor divider. There is no digital interface or voltage-adjust pin. To change V_OUT, the external R1/R2 values must be modified-intended for fixed-output applications like sensor biasing or SoC core rails.

What is the minimum recommended input capacitance for stable operation at 6V input and 0.6A load?

A 10µF X5R/X7R ceramic capacitor is minimum; 22µF is recommended for 6V input to reduce input ripple and improve stability under transient load steps. The capacitor must be placed within 2mm of VIN and PGND pins, with ≤10mΩ ESL, to handle peak switching currents without voltage sag.

How does the hiccup-mode short-circuit protection behave during sustained fault conditions?

Upon short circuit, the device disables the power stage, discharges the soft-start capacitor, waits ~20ms, then attempts soft restart. If the fault persists, it repeats the cycle indefinitely-limiting average power dissipation to <150mW and preventing thermal damage. Recovery is automatic once the short is removed.

Is the PG pin compatible with 1.8V logic microcontrollers without level shifting?

Yes. When active, PG pulls up to VIN (2.6–6V) via internal 550kΩ resistor; when inactive, it pulls down to <0.4V. For 1.8V I/O, add a 10kΩ series resistor and 1.8V clamp diode to protect the MCU input-verified in MPS EVB-3805A schematics.

What is the typical efficiency at 3.3V input, 1.2V/0.6A output, and 25°C ambient?

Typical efficiency is 92% under those conditions, per Figure 5 in the datasheet. Efficiency remains ≥88% across 0.1–0.6A load range at 3.3V input, due to optimized FET R_DS(ON) and COT control minimizing light-load losses.