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

Overview

MPM3805BGQB-12-AEC1-Z 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 at a fixed 1.2V output from a 2.5V–6V input. It employs constant-on-time (COT) control for fast transient response and operates in forced continuous conduction mode (CCM). Used in automotive rear camera modules and telematics ECUs where space-constrained, high-reliability DC/DC conversion is required.

For engineers reviewing the MPM3805BGQB-12-AEC1-Z datasheet, MPM3805BGQB-12-AEC1-Z pinout, MPM3805BGQB-12-AEC1-Z application, or MPM3805BGQB-12-AEC1-Z equivalent, key selection criteria include its QFN-12 package footprint, 1.2V fixed output accuracy (±2.5%), integrated inductor (0.47µH), thermal shutdown at 150°C, and PG/EN sequencing support for automotive power domains.

Technical Context

The MPM3805BGQB-12-AEC1-Z implements constant-on-time (COT) control with input voltage feed-forward to maintain stable switching frequency (2.7–4.2 MHz) across 2.5V–6V input range. Its internal 0.47µH inductor and matched PFET/NFET switches (RDSON_P = 230 mΩ max, RDSON_N = 130 mΩ max) enable compact, low-noise regulation without external magnetics.

It operates in forced CCM and includes cycle-by-cycle over-current protection (2.1A typ), hiccup-mode short-circuit recovery, and ±10% power-good window referenced to 0.6V FB. The EN pin has 1.2V logic-high threshold and internal 1MΩ pull-down; PG is open-drain with 550kΩ internal pull-up to VIN.

Key Specifications

Pinout & Package

MPM3805BGQB-12-AEC1-Z 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 under-hood environments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS82084SILR and RT7297BZSP, the MPM3805BGQB-12-AEC1-Z uniquely combines AEC-Q100 Grade 1 qualification, integrated inductor, PG/EN sequencing, and 2.5V minimum input - making it the only drop-in solution for space- and reliability-constrained automotive vision systems.

Availability

MPM3805BGQB-12-AEC1-Z is available at Aetrix Electronics and suitable for automotive rear camera modules, telematics control units, and eCall emergency systems requiring stable component supply across extended temperature and long product lifecycles.

Supply support for MPM3805BGQB-12-AEC1-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 power management ICs and modules, with design centers in the US, China, and Taiwan.

The MPM3805B product line delivers compact, AEC-Q100-qualified DC/DC modules targeting automotive subsystems demanding high integration, small footprint, and robust thermal performance - especially camera, sensor, and connectivity applications.

FAQ

What is the maximum ambient temperature for continuous operation?

The MPM3805BGQB-12-AEC1-Z supports continuous operation up to +105°C ambient temperature when mounted on a 4-layer PCB with recommended copper area, based on its −40°C to +125°C junction rating and θJA = 65°C/W. Derating is required above this ambient to maintain TJ ≤ 125°C.

Can the output voltage be adjusted externally?

No - the MPM3805BGQB-12-AEC1-Z has a factory-trimmed fixed 1.2V output. There is no feedback resistor divider or external adjustment pin; the FB node is internally connected to generate 0.6V reference, and OUT_S is solely for remote sensing.

Is the PG pin compatible with 3.3V logic systems?

Yes - PG is an open-drain output with internal 550kΩ pull-up to VIN. When VIN ≥ 3.3V, PG pulls high to VIN (≥3.3V), which exceeds standard 3.3V logic high thresholds. For VIN < 3.3V, an external pull-up to 3.3V is recommended to ensure clean logic-level signaling.

What is the minimum input capacitance required?

A 10µF X5R/X7R ceramic capacitor placed within 2mm of VIN and PGND is the minimum recommended for stable operation. This value satisfies RMS current handling (≥0.3A) and limits input ripple to <30mV under full 0.6A load at 2.5V input, per Equation (3) and (4) in the datasheet.

Does the device support forced PWM mode at light load?

Yes - the MPM3805BGQB-12-AEC1-Z operates exclusively in forced continuous conduction mode (CCM) across all load conditions, eliminating mode transitions and associated output voltage ripple or audible noise common in pulse-skipping or DCM implementations.

How is thermal performance affected by the exposed pad connection?

The exposed thermal pad (pins 1–2 PGND) must be soldered to a ≥40mm² copper pour connected to PGND. Without this, θJA degrades from 65°C/W to >100°C/W, risking thermal shutdown at >0.4A load. Verified thermal testing shows 25°C rise at 0.6A with proper pad layout.

What happens during input undervoltage lockout (UVLO)?

When VIN drops below 2.2V (rising threshold), the device disables switching and discharges the soft-start capacitor. Output collapses, PG goes low, and quiescent current drops to 1µA. Recovery occurs only after VIN rises above 2.6V (hysteresis = 300mV), ensuring clean restart without oscillation.