Monolithic Power Systems Inc. MPM3612GLQ-P

Overview

MPM3612GLQ-P from Monolithic Power Systems is a synchronous step-down power module integrating high- and low-side MOSFETs, 2.2µH inductor, and control circuitry in a single LGA package. It delivers up to 1A continuous output current with ultra-low 5µA quiescent current, operates from 3V–22V input, and supports adjustable output voltage (0.6V–VIN×DMAX) for battery-powered IoT and home security systems.

For engineers reviewing the MPM3612GLQ-P datasheet, MPM3612GLQ-P pinout, MPM3612GLQ-P application, or MPM3612GLQ-P equivalent, key selection criteria include its 5µA IQ, COT control architecture for fast transient response, integrated thermal shutdown and OCP/OVP protection, and LGA (3mm×3mm×2mm) footprint requiring minimal external components.

Technical Context

The MPM3612GLQ-P uses constant-on-time (COT) control to enable seamless transition between PWM and pulse-skip mode, achieving fast load transient response and stable regulation across 100µA–1A loads. Its internal 2.2µH inductor and integrated 260mΩ/120mΩ HS/LS MOSFETs eliminate external magnetics while supporting up to 98% duty cycle via t_ON extension for high-VIN-to-low-VOUT conversion.

It features a 3.3V internal VCC LDO powered from VIN, open-drain PG with 120µs rising/50µs falling delay, EN-controlled output discharge, and hiccup-mode over-current protection triggered at 1.15A valley current limit. Thermal shutdown activates at 150°C with 20°C hysteresis.

Key Specifications

Pinout & Package

LGA package (3mm × 3mm × 2mm) with exposed thermal pad on underside, requiring solder connection to PCB ground plane for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPM3612GLQ-P, the MPM3620GLQ-P offers headroom for current growth at minor efficiency cost, while the TPS82084SILR trades battery runtime for marginally faster transient response-making the MPM3612GLQ-P optimal for long-life, space-constrained, and wide-input industrial IoT designs.

Availability

MPM3612GLQ-P is available at Aetrix Electronics and suitable for IoT sensor nodes, home security systems, multi-cell battery-powered instrumentation, and industrial edge gateways requiring stable component supply with guaranteed long-term availability.

Supply support for MPM3612GLQ-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, headquartered in Kirkland, WA, with global design and support centers.

The MPM3612 product line delivers fully integrated, ultra-low-I_Q DC/DC power modules targeting battery-critical applications in IoT, wearables, and industrial sensing where size, efficiency, and reliability are paramount.

FAQ

What is the minimum required input capacitance for stable operation?

The MPM3612GLQ-P requires ≥20µF X5R/X7R ceramic input capacitance placed adjacent to the VIN pin. This value satisfies RMS ripple current rating (>0.5A) and limits input voltage ripple to <100mV under worst-case 2×VOUT condition, ensuring reliable COT loop stability and preventing premature UVLO triggering.

Can the output voltage be set below 0.6V?

No. The internal feedback reference is fixed at 600mV ±6mV, and the datasheet specifies VOUT = 0.6V as the absolute minimum. Attempting sub-0.6V regulation violates the FB comparator's operating range and results in unregulated or unstable output due to insufficient error amplifier headroom.

How does the power-good (PG) pin behave during thermal shutdown?

During thermal shutdown, the PG pin is pulled low immediately-without delay-to signal loss of regulation. This occurs because thermal fault disables the control logic, causing VFB to drop below the 87% UV threshold. PG remains low until junction temperature falls to ~130°C and soft-start completes, ensuring system-level fault awareness.

Is the exposed thermal pad electrically isolated?

No. The exposed pad is internally connected to GND and must be soldered to a PCB copper pour tied to the system ground plane. Leaving it floating or connecting it to any other net causes thermal derating, potential EMI issues, and violates the absolute maximum rating for exposed pad voltage (–0.3V to +24V).

What happens during pre-biased start-up?

The MPM3612GLQ-P supports monotonic start-up into pre-biased outputs. When enabled, it refreshes the bootstrap capacitor and charges the internal soft-start capacitor. If VOUT is already above the target, the controller enters skip mode immediately-preventing reverse current flow and avoiding output voltage overshoot or ringing.

Does the device support forced PWM mode?

No. The MPM3612GLQ-P operates exclusively in automatic PSM/PWM mode. There is no external pin or register to force continuous conduction mode. Light-load efficiency is prioritized via frequency reduction and valley-current-controlled pulse skipping, making forced PWM incompatible with its COT architecture.

What is the maximum recommended output capacitance?

The maximum safe output capacitance is calculated as C_{OUT_MAX} = (I_{LIM_AVG} – I_OUT) × t_SS / V_OUT. For standard 1.3ms soft-start and 1A load, this yields ~120µF. Exceeding this risks failure to reach regulation during start-up due to excessive capacitor charging time, especially with high-ESR electrolytics.