Monolithic Power Systems Inc. MP2110GQ-Z

Overview

MP2110GQ-Z from Monolithic Power Systems is a 3A synchronous step-down DC/DC converter with integrated programmable input current limit switch, constant-on-time (COT) control, and dual enable inputs (ENREG/ENSYS). It delivers up to 95% efficiency at 1.5MHz switching frequency, supports 3.3V–5.4V continuous input (12V transient tolerant), regulates output down to 0.6V, and is designed for USB-powered portable devices requiring precise input current capping and thermal safety.

For engineers reviewing the MP2110GQ-Z datasheet, MP2110GQ-Z pinout, MP2110GQ-Z application, or MP2110GQ-Z equivalent, key selection criteria include its 0.6V feedback reference, ±10% current limit accuracy above 1A, 70mΩ/50mΩ internal MOSFET R_DS(on), independent thermal sense via NTC pin, and QFN-14 (3mm×3mm) package with exposed thermal pad.

Technical Context

The MP2110GQ-Z integrates two functional blocks: a COT-controlled synchronous buck regulator (SW, FB, REGIN, PGND, AGND, OUT) and an independent input current limit switch (SYSIN, ENSYS, REGIN, RSET) with OVP clamping at 5.65V. Its COT architecture uses input voltage feed-forward to maintain stable 1.5MHz operation across input and load variations, while proprietary light-load control eliminates switching-node ringing.

Fault protection includes cycle-by-cycle current limiting (5A PFET limit), thermal shutdown at 160°C with 20°C hysteresis, external NTC-based temperature sensing (trip at 14.5% VSYSIN), and SYSIN under-voltage lockout (2.4V threshold). The device supports 100% duty cycle operation and features separate soft-start (2.5ms) and discharge functions.

Key Specifications

Pinout & Package

MP2110GQ-Z is housed in a thermally enhanced 14-pin QFN package (3mm × 3mm, 0.5mm pitch) with exposed thermal pad connected to PGND. The package enables high-power density and efficient heat dissipation in space-constrained USB-powered designs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck converter with input current limit applications.

Compared with MP2110GQ-Z, MP2112GQ-Z offers headroom for higher loads without changing layout, while TPS62130ARGTR trades integrated protection features for broader input range and lower BOM count-making it viable only where current limiting and thermal sensing are handled externally.

Availability

MP2110GQ-Z is available at Aetrix Electronics and suitable for USB-powered wireless modems, smartphone peripheral power rails, portable medical instruments, and industrial handheld scanners requiring stable component supply, consistent thermal performance, and programmable input current compliance.

Supply support for MP2110GQ-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 analog and mixed-signal ICs for power management, motion control, and automotive applications.

The MP2110 belongs to MPS's USB-compliant power conversion product line, engineered specifically for portable electronics requiring precise input current limiting, compact footprint, and robust thermal protection in 3–5V input environments.

FAQ

What is the minimum output voltage supported by MP2110GQ-Z?

The MP2110GQ-Z supports output voltages as low as 0.6V, set by its internal 0.600V ±2% feedback reference voltage. This enables direct generation of core logic rails (e.g., 0.9V, 1.2V) using standard resistor dividers without external amplification or level-shifting circuitry.

How does the programmable input current limit function work?

The MP2110GQ-Z uses an external resistor (RSET) between Pin 6 and GND to set the input current limit from 0.3A to 3A. The relationship is approximated by I_LIM ≈ 0.96 × (4 kΩ / R_SET), with ±10% accuracy for limits above 1A. When triggered, the current limit switch clamps REGIN to prevent overcurrent on the SYSIN source.

Can MP2110GQ-Z operate with a 3.0V input supply?

No-MP2110GQ-Z requires a minimum continuous input voltage of 3.3V per its recommended operating conditions. At 3.0V, the SYSIN UVLO (2.4V threshold) may allow startup, but regulation, current limiting, and thermal protection are not guaranteed outside the 3.3V–5.4V range.

What is the purpose of the separate AGND and PGND pins?

AGND (Pin 7) provides a clean analog reference for the feedback comparator, NTC comparator, and internal bias circuits. PGND (Pins 1,2) carries high-current return paths for the power switches. Separating them prevents noise coupling that could cause regulation instability or false thermal trips.

Does MP2110GQ-Z support forced PWM mode?

No-MP2110GQ-Z uses constant-on-time (COT) control with automatic discontinuous conduction mode (DCM) entry at light loads. It does not offer a forced PWM pin or mode; instead, its proprietary light-load scheme eliminates switching-node ringing while maintaining high efficiency below 100mA.

How is thermal protection implemented beyond the 160°C shutdown?

In addition to internal 160°C thermal shutdown, MP2110GQ-Z provides external thermal monitoring via the NTC pin (Pin 11). By connecting a thermistor network, designers can trigger early shutdown at custom temperatures (e.g., 85°C PCB hotspot) before silicon junction reaches critical levels-enabling graded thermal response.

What layout practices are critical for stable MP2110GQ-Z operation?

Essential layout practices include: (1) tying the exposed thermal pad and PGND pins to a solid inner-layer ground plane with ≥6 thermal vias; (2) placing the 10μF SYSIN ceramic capacitor within 2mm of Pins 12/1–2; (3) routing SW (Pins 13–14) away from FB/NTC traces; and (4) keeping FB resistor traces short and shielded from noisy nodes.