Monolithic Power Systems Inc. MP2172CGQFU-P

Overview

MP2172CGQFU-P from Monolithic Power Systems is a monolithic synchronous step-down DC/DC converter with integrated 75mΩ P-channel and 45mΩ N-channel MOSFETs, delivering up to 2A continuous output current from a 2.38V–5.5V input range while regulating output as low as 0.6V. It employs constant-on-time (COT) control for fast transient response and includes output discharge, over-voltage protection (OVP), and hiccup-mode short-circuit protection - ideal for powering low-voltage I/O rails in portable instrumentation and wireless networking cards.

For engineers reviewing the MP2172CGQFU-P datasheet, MP2172CGQFU-P pinout, MP2172CGQFU-P application, or MP2172CGQFU-P equivalent, key selection criteria include its 1.1MHz fixed switching frequency, 1% FB voltage accuracy, UTQFN-6 (1.2mm×1.6mm) package footprint, EN-controlled power sequencing, and verified thermal shutdown at 160°C with 30°C hysteresis.

Technical Context

The MP2172CGQFU-P implements a constant-on-time (COT) control architecture with input voltage feed-forward, enabling stable 1.1MHz operation across its full 2.38V–5.5V input range and 0.6V–5.5V output range. Its internal power stage integrates complementary MOSFETs with on-resistances of 75mΩ (high-side) and 45mΩ (low-side), supporting 100% duty-cycle operation and efficient light-load performance.

Protection features are tightly coupled to real-time sensing: VOUT OVP triggers dynamic regulation when FB exceeds 115% of 600mV, while absolute VIN OVP activates at 6.1V with 400mV hysteresis. Thermal shutdown engages at 160°C, and cycle-by-cycle current limiting initiates at 2.8A high-side peak current, forcing hiccup-mode recovery during sustained overload or short-circuit conditions.

Key Specifications

Pinout & Package

MP2172CGQFU-P is housed in an ultra-thin UTQFN-6 package measuring 1.2mm × 1.6mm with 0.4mm pitch, optimized for space-constrained portable designs. The exposed thermal pad enhances thermal dissipation in 2-layer PCB layouts (θJA = 65°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with RT7295BZSP and TPS62865ARGTR, MP2172CGQFU-P uniquely combines 2A capability, 1.1MHz operation, output discharge, and UTQFN-6 footprint - making it optimal for space-limited, multi-rail portable systems requiring deterministic power-down behavior.

Availability

MP2172CGQFU-P is available at Aetrix Electronics and suitable for wireless networking cards, portable instrumentation, and battery-powered devices requiring stable component supply with guaranteed long-term manufacturability and RoHS-compliant sourcing.

Supply support for MP2172CGQFU-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, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MP2172C product line targets ultra-compact, high-efficiency DC/DC conversion for portable and battery-operated electronics - emphasizing minimal external components, fast transient response, and robust fault protection in sub-2mm² packages.

FAQ

What is the minimum recommended output capacitance for stable operation?

The MP2172CGQFU-P requires ≥22µF ceramic output capacitance with X5R/X7R dielectric for stable regulation at 2A. Lower values risk instability and excessive ripple; using two 10µF capacitors in parallel improves high-frequency ESR performance and thermal derating margin.

Does MP2172CGQFU-P support adjustable output voltage?

Yes - output voltage is set externally via a resistor divider from VOUT to GND connected to the FB pin. With a 600mV internal reference, common configurations include 1.2V (200kΩ/200kΩ), 1.8V (200kΩ/100kΩ), and 3.3V (200kΩ/44.2kΩ), all verified in the datasheet's Table 1.

How does the output discharge function behave during EN deactivation?

When EN is pulled low, the internal 200Ω discharge FET activates automatically, sinking current from VOUT to GND. This collapses the output voltage within ~1–3ms depending on output capacitance, eliminating floating rail conditions critical for safe power sequencing in multi-voltage systems.

What is the maximum allowable ambient temperature for 2A continuous operation?

At 2A load and VIN=5V, the MP2172CGQFU-P sustains continuous operation up to +85°C ambient on a 2-layer PCB (θJA = 65°C/W). Above this, output current must be derated per Figure 8 - e.g., to ~1.6A at +100°C ambient - to maintain TJ ≤ 125°C.

Can MP2172CGQFU-P operate with input voltage below 2.38V?

No - the under-voltage lockout (UVLO) rising threshold is 2.38V (min), and operation below this disables the controller. Attempting to bias VIN between 2.25V–2.38V results in unstable or non-functional regulation due to UVLO hysteresis and insufficient gate drive headroom for internal MOSFETs.

Is the UTQFN-6 package lead-free and RoHS-compliant?

Yes - MP2172CGQFU-P is fully lead-free, halogen-free, and compliant with the EU RoHS Directive 2011/65/EU. MPS confirms green status on its Quality Assurance portal, and the device meets JEDEC J-STD-020 moisture sensitivity level MSL3.

What layout practices prevent EMI in MP2172CGQFU-P designs?

Minimize SW loop area by placing the inductor and input capacitor adjacent to pins 2 (SW) and 3 (VIN); use a solid GND plane beneath the UTQFN thermal pad; keep FB traces short and away from SW; and route OUT sense directly to the load connector - these reduce radiated emissions and improve transient immunity per Figure 10 guidelines.