Monolithic Power Systems Inc. MPM3805BGQB-12-AEC1-P

Overview

MPM3805BGQB-12-AEC1-P from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified, synchronous step-down power module with integrated inductor and MOSFETs, delivering up to 0.6A peak output current from a 2.5V–6V input range. It provides a fixed 1.2V output, operates in forced continuous conduction mode (CCM), and features constant-on-time (COT) control for fast transient response-ideal for automotive camera modules and small ECUs.

For engineers reviewing the MPM3805BGQB-12-AEC1-P datasheet, MPM3805BGQB-12-AEC1-P pinout, MPM3805BGQB-12-AEC1-P application, or MPM3805BGQB-12-AEC1-P equivalent, key selection criteria include its QFN-12 package footprint, integrated 0.47µH inductor, ±10% power-good window, 1.5ms soft-start time, and automotive-grade thermal shutdown at 150°C.

Technical Context

The MPM3805BGQB-12-AEC1-P implements constant-on-time (COT) control with input voltage feed-forward, maintaining switching frequency stability across 2.5V–6V input and 1.2V output. Its internal 0.47µH inductor and matched PFET/NFET switches (RDSON_P = 100–230mΩ, RDSON_N = 60–130mΩ) enable compact, low-noise DC/DC conversion without external magnetics.

It integrates EN logic-level control (1.2V high threshold), open-drain PG with 550kΩ internal pull-up, and analog ground (AGND) separation for noise-sensitive feedback. Protection includes cycle-by-cycle current limiting (2.1A typ), hiccup-mode short-circuit recovery, and thermal shutdown with 30°C hysteresis.

Key Specifications

Pinout & Package

MPM3805BGQB-12-AEC1-P is housed in a thermally enhanced QFN-12 package measuring 2.5mm × 3.0mm × 0.9mm, with exposed thermal pad (PGND-connected) for efficient heat dissipation in automotive environments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS82084SILR and MAX20004AATP/V+T, the MPM3805BGQB-12-AEC1-P offers superior transient response via COT control, integrated PG signaling for automotive power sequencing, and smallest total solution size - making it optimal for space-constrained, high-dynamic automotive loads.

Availability

MPM3805BGQB-12-AEC1-P is available at Aetrix Electronics and suitable for automotive camera modules, rear-view ECUs, and telematics control units requiring stable component supply, AEC-Q100 compliance, and compact power delivery.

Supply support for MPM3805BGQB-12-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 power management ICs and modules, with over two decades of leadership in integrated power solutions.

The MPM3805B product line delivers fully integrated, AEC-Q100-qualified DC/DC modules targeting space- and reliability-constrained automotive subsystems such as ADAS sensors, infotainment, and body electronics.

FAQ

What is the maximum allowable input voltage for MPM3805BGQB-12-AEC1-P?

The absolute maximum input voltage is 6.5V. Continuous operation above 6.0V violates recommended operating conditions and risks permanent damage. The device incorporates under-voltage lockout (UVLO) with rising threshold of 2.2–2.6V and 300mV hysteresis to ensure safe startup and shutdown behavior.

Does MPM3805BGQB-12-AEC1-P require external compensation components?

No. The constant-on-time (COT) control architecture eliminates the need for external compensation networks. Only two ceramic capacitors - a 10µF input capacitor near VIN/PGND and a 10–22µF output capacitor near OUT/OUT_S - are required to complete the design.

How does the OUT_S pin improve regulation accuracy?

OUT_S provides remote sensing of the output voltage at the load, compensating for voltage drop across PCB traces between the module and load. This ensures tight regulation (±2.5%) at the point-of-load, critical for noise-sensitive image sensors and high-speed digital cores.

Can MPM3805BGQB-12-AEC1-P operate in dropout mode?

Yes. It supports 100% duty cycle operation, allowing regulation even when VIN approaches VOUT (e.g., VIN = 1.3V). This enables reliable operation during automotive cold-crank events where battery voltage dips to 2.5V while supplying 1.2V loads.

What is the thermal performance of the QFN-12 package?

The QFN-12 (2.5mm × 3.0mm) package has θJA = 65°C/W and θJC = 13°C/W on a 4-layer JEDEC-standard PCB. With 1.9W max continuous power dissipation at 25°C ambient, it sustains full 0.6A load at up to +85°C ambient when properly mounted on ≥2 oz copper with thermal vias to inner ground planes.

Is the EN pin internally pulled down?

Yes. An internal 1MΩ resistor pulls EN to ground, ensuring the device remains disabled during power-up or if the EN trace is left unconnected. A logic-high signal ≥1.2V is required to enable operation; logic-low ≤0.4V forces shutdown with <10µA quiescent current.

How does hiccup-mode protection work during short-circuit events?

Upon detecting overcurrent, the device disables the power stage, discharges the soft-start capacitor, waits briefly, then attempts re-start. If the short persists, it repeats this cycle - limiting average power dissipation and preventing thermal damage while maintaining system visibility via PG deassertion.