Monolithic Power Systems Inc. MP2153GQFU-12-Z

Overview

MP2153GQFU-12-Z from Monolithic Power Systems is a fixed-output 1.2V, 3A synchronous step-down DC/DC converter in UTQFN-6 (1.2mm×1.6mm) package, featuring 25μA quiescent current, 1.1MHz switching frequency, and integrated 65mΩ/35mΩ MOSFETs. It delivers stable power to low-voltage digital rails in SSDs and portable instrumentation under 2.5V–5.5V input.

For engineers reviewing the MP2153GQFU-12-Z datasheet, MP2153GQFU-12-Z pinout, MP2153GQFU-12-Z application, or MP2153GQFU-12-Z equivalent, key selection criteria include its fixed 1.2V output with ±1% FB accuracy, output discharge capability during shutdown, VOUT over-voltage protection with 115% threshold, hiccup-mode short-circuit protection, and EN-controlled power sequencing for multi-rail systems.

Technical Context

The MP2153GQFU-12-Z employs constant-on-time (COT) control with input voltage feed-forward to maintain stable 1.1MHz switching across 2.5V–5.5V input and 1.2V output, enabling fast transient response without external compensation. Its internal high-side P-channel (65mΩ) and low-side N-channel (35mΩ) MOSFETs eliminate external switch requirements.

It integrates dedicated protection circuitry: cycle-by-cycle current limiting (4A peak), thermal shutdown at 160°C with 30°C hysteresis, output discharge via internal MOSFET when EN=0, and dynamic VOUT OVP regulation that forces low-side conduction until FB falls below 105% of reference.

Key Specifications

Pinout & Package

MP2153GQFU-12-Z uses the UTQFN-6 (1.2mm × 1.6mm, 0.5mm pitch) package with wettable flanks, optimized for automated optical inspection and thermal performance in ultra-compact layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-output synchronous buck converter applications.

Compared with TPS6286412RQWR and RT7295BGJ6F, MP2153GQFU-12-Z uniquely combines 2.5V startup, integrated output discharge, and 100% duty cycle in a 1.2mm×1.6mm package-making it optimal for space- and battery-life–constrained 1.2V core rails where controlled shutdown and brownout resilience are mandatory.

Availability

MP2153GQFU-12-Z is available at Aetrix Electronics and suitable for solid-state drives, portable instrumentation, battery-powered IoT sensors, and multi-function printers requiring stable component supply with guaranteed long-term manufacturability.

Supply support for MP2153GQFU-12-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, with over two decades of innovation in DC/DC conversion, motor drivers, and LED lighting controllers.

The MP2153 product line targets ultra-compact, low-I_Q point-of-load regulation for portable and storage applications, emphasizing minimal external components, robust protection, and seamless integration into thermally dense PCB layouts.

FAQ

What is the purpose of the PG pin on MP2153GQFU-12-Z?

The PG (power good) pin is an open-drain output that signals valid 1.2V regulation. It pulls low when FB voltage deviates outside the ±10%/+15% window (1.08–1.38V); otherwise, it remains high via external pull-up. This enables system-level power sequencing and fault monitoring without additional supervisor ICs.

Does MP2153GQFU-12-Z require external feedback resistors?

No. As a fixed-output variant, MP2153GQFU-12-Z has internal feedback network set to 1.2V and does not use the FB pin. The FB pin is omitted in this version-pin 5 is PG, and pin 6 is OUT. External resistors are unnecessary and must not be connected to FB.

How does output discharge function during shutdown?

When EN is pulled low, MP2153GQFU-12-Z activates an internal 200Ω discharge MOSFET between OUT and GND. This safely bleeds stored energy from the output capacitor, reducing VOUT to <100mV within 1–2ms-critical for preventing latch-up in downstream logic during power cycling.

What thermal performance can be expected in a 2-layer PCB layout?

On a standard 2-layer 63mm×63mm EV2153-QFU-00A board, θ_JA is 65°C/W. At 3A load and 5V input, junction temperature rise is ~195°C × (3A)² × 0.035Ω / 65°C/W ≈ 22°C above ambient-well within the 125°C max operating limit, confirming suitability for fanless designs.

Is MP2153GQFU-12-Z compatible with ceramic output capacitors?

Yes. The COT control architecture is inherently stable with low-ESR ceramic capacitors. The typical application uses 22μF X5R/X7R ceramics; minimum recommended capacitance is 10μF. Aluminum polymer or tantalum caps are not required or recommended.

What protection features activate during a short-circuit event?

Upon short-circuit detection, MP2153GQFU-12-Z triggers hiccup-mode protection: it disables switching, discharges the soft-start capacitor, waits ~150μs, then attempts soft restart. This limits average power dissipation to <150mW, preventing thermal damage while enabling automatic recovery once the fault clears.

Can MP2153GQFU-12-Z operate with input voltage below 2.5V?

No. The absolute minimum input is 2.5V per datasheet specifications. Under-voltage lockout (UVLO) disables operation below 2.3V (with 200mV hysteresis), and the device cannot regulate or sustain 3A output below 2.5V-even with 100% duty cycle-due to internal gate drive limitations.