Monolithic Power Systems Inc. MPM3805AGQB-AEC1-P

Overview

MPM3805AGQB-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 across 2.6V–6V input, regulates output down to 0.6V, and features constant-on-time (COT) control with 1.5ms soft-start and power-good indication-designed for automotive camera modules and ECU power rails.

For engineers reviewing the MPM3805AGQB-AEC1-P datasheet, MPM3805AGQB-AEC1-P pinout, MPM3805AGQB-AEC1-P application, or MPM3805AGQB-AEC1-P equivalent, key selection criteria include its AEC-Q100 qualification, integrated inductor simplifying layout, 0.6A peak current capability, forced CCM operation, and PG/EN sequencing support for automotive subsystems.

Technical Context

The MPM3805AGQB-AEC1-P implements constant-on-time (COT) control with input voltage feed-forward, maintaining switching frequency stability across 2.6V–6V input and 0.6V–VIN output ranges. Its 70ns typical on-time at 5V input enables fast transient response, while fixed 60ns minimum off-time prevents inductor current runaway during load steps.

It operates in forced continuous conduction mode (FCCM), supports 100% duty cycle in dropout, and integrates cycle-by-cycle over-current protection with hiccup-mode short-circuit recovery. The internal 550kΩ pull-up on PG and 1MΩ EN-to-GND resistor enable robust power sequencing without external components.

Key Specifications

Pinout & Package

MPM3805AGQB-AEC1-P is housed in a surface-mount QFN-12 package measuring 2.5mm × 3.0mm × 0.9mm, with exposed thermal pad on underside for enhanced heat dissipation in automotive ambient conditions (−40°C to +125°C junction).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous step-down module applications.

Compared with TPS82084SILR, MPM3805AGQB-AEC1-P adds PG and OUT_S for robust automotive sequencing and load regulation, while LM61460QRJRQ1 offers excessive headroom-making MPM3805AGQB-AEC1-P the optimal balance of integration, qualification, and cost for sub-1A automotive rails.

Availability

MPM3805AGQB-AEC1-P is available at Aetrix Electronics and suitable for automotive ECU power supplies, rear camera modules, telematics subsystems, and infotainment audio rails requiring stable component supply with full AEC-Q100 traceability and long-term production support.

Supply support for MPM3805AGQB-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 two decades of leadership in DC/DC conversion, motor drivers, and LED lighting controllers.

The MPM3805A product line delivers fully integrated, AEC-Q100 qualified power modules targeting automotive subsystems requiring small footprint, high reliability, and simplified design-especially camera, radar, and infotainment power rails.

FAQ

What is the maximum output current capability of the MPM3805AGQB-AEC1-P?

The MPM3805AGQB-AEC1-P delivers up to 0.6A peak output current under typical conditions (TJ ≤ 125°C, VIN = 5V, VOUT = 1.2V). Its 1.2A typical P-FET current limit and thermal shutdown at 150°C provide margin for short-duration transients, but sustained operation above 0.6A requires derating per the ambient temperature curve in the datasheet.

Does the MPM3805AGQB-AEC1-P require external compensation components?

No. The MPM3805AGQB-AEC1-P uses constant-on-time (COT) control with built-in input voltage feed-forward, eliminating the need for external compensation networks. Only two feedback resistors (R1/R2), one input capacitor (≥10µF), and one output capacitor (≥10µF) are required for full operation.

How does the OUT_S pin improve performance in automotive applications?

The OUT_S pin enables remote voltage sensing at the load, compensating for IR drop across PCB traces or connectors. In rear camera modules with 15cm+ cable runs, this maintains ±1% output regulation at the sensor-critical for stable analog front-end biasing and reduced image noise.

Can the MPM3805AGQB-AEC1-P operate with a 2.5V input?

Yes. The absolute minimum operating input voltage is 2.6V per datasheet specifications. At 2.5V, the device remains functional but may not guarantee regulation or specified current capability; operation below 2.6V risks UVLO activation or degraded efficiency and should be avoided in production designs.

Is the thermal pad on the QFN-12 package electrically connected?

Yes. The exposed thermal pad is internally connected to PGND and must be soldered to a dedicated copper pour tied to the PGND plane. This connection is essential for thermal performance-failure to do so reduces θJA by ~25°C/W and risks premature thermal shutdown under 0.6A load.

What is the purpose of the hiccup-mode short-circuit protection?

Hiccup mode limits average power dissipation during sustained shorts by cycling the converter on/off with 1.5ms soft-start intervals. This prevents thermal runaway and allows automatic recovery once the fault clears-ideal for automotive wiring harness faults where manual reset is impractical.

How does the EN pin behave when left floating?

With an internal 1MΩ pull-down resistor, the EN pin defaults to logic low when floating, disabling the device. This fail-safe behavior ensures the module remains off until intentionally enabled-critical for preventing uncontrolled power-up in automotive subsystems.