Monolithic Power Systems Inc. MP2153GQFU-15-P

Overview

MP2153GQFU-15-P from Monolithic Power Systems is a fixed-output 1.5V, 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 logic rails in SSDs and portable instrumentation under 2.5V–5.5V input.

For engineers reviewing the MP2153GQFU-15-P datasheet, MP2153GQFU-15-P pinout, MP2153GQFU-15-P application, or MP2153GQFU-15-P equivalent, key selection criteria include fixed 1.5V ±1% output accuracy, output discharge during shutdown, VOUT OVP with 115% threshold, hiccup-mode short-circuit protection, and EN-controlled power sequencing for multi-rail systems.

Technical Context

The MP2153GQFU-15-P uses constant-on-time (COT) control with input voltage feed-forward to maintain stable 1.1MHz switching across its 2.5V–5.5V input range. Its internal high-side P-channel (65mΩ) and low-side N-channel (35mΩ) MOSFETs enable up to 3A continuous output at 1.5V with minimal external components.

It integrates output discharge via an internal MOSFET when EN is low, supports power-good indication (open-drain PG pin), and implements dual-stage over-voltage protection: dynamic regulation at 115% VFB followed by absolute VIN OVP at 6.1V. Thermal shutdown activates at 160°C with 30°C hysteresis.

Key Specifications

Pinout & Package

MP2153GQFU-15-P is housed in a 6-pin UTQFN-6 package (1.2mm × 1.6mm, 0.5mm profile) with wettable flanks and exposed thermal pad. Pin 1 is marked by a dot; top marking "GQ" identifies the -15V fixed-output variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS6286515RTER and RT7295BGJ6F, MP2153GQFU-15-P uniquely combines true 1.5V fixed output, integrated discharge, PG signaling, and industry-smallest UTQFN-6 footprint-making it optimal for space- and sequencing-critical 1.5V applications where external feedback is undesirable.

Availability

MP2153GQFU-15-P is available at Aetrix Electronics and suitable for solid-state drives, portable instrumentation, battery-powered wireless sensors, and multi-function printer subsystems requiring stable component supply with guaranteed long-term availability.

Supply support for MP2153GQFU-15-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, founded in 1997 and headquartered in Kirkland, Washington.

The MP2153 product line targets ultra-compact, low-IQ DC/DC conversion for space-constrained portable and storage applications-designed specifically to replace linear regulators and discrete buck solutions in sub-3A, sub-5.5V systems.

FAQ

What is the purpose of the PG pin on MP2153GQFU-15-P?

The PG (power good) pin is an open-drain output that signals when the 1.5V output is within ±10% of regulation (1.35V–1.65V). It requires an external 100–500kΩ pull-up resistor to VIN or VOUT. When active, PG remains high-impedance; when out-of-regulation, the internal MOSFET pulls it to ground with <400Ω RDS(ON), enabling reliable system power sequencing.

Does MP2153GQFU-15-P require external feedback resistors?

No. MP2153GQFU-15-P is a fixed-output variant with internal feedback network set to 1.5V. The FB pin is internally connected and must be left unconnected (no external resistors). This eliminates tuning error, reduces component count, and improves long-term output stability versus adjustable versions.

How does output discharge work during shutdown?

When EN is pulled low or left floating, MP2153GQFU-15-P activates an internal 200Ω discharge MOSFET between VOUT and GND. This safely collapses the 1.5V rail in under 1ms (with typical 22μF output capacitance), preventing back-powering of upstream circuitry and enabling clean multi-rail power-down sequences.

What thermal derating applies to the 3A rating?

The 3A continuous rating assumes ambient temperature ≤85°C and proper PCB thermal design: 1-inch² 2oz copper pour under the UTQFN-6 thermal pad, with ≥4 thermal vias to inner ground planes. At 100°C ambient, maximum sustainable output current drops to ~2.2A per the output current derating curve in the datasheet.

Can MP2153GQFU-15-P operate from a 2.5V input while delivering 1.5V at 3A?

Yes. The device supports full 3A output down to 2.5V input, though efficiency drops to ~82% (vs. 92% at 5V input) due to increased conduction losses. Minimum on-time (60ns) and COT architecture ensure stable regulation even at 2.5V–1.5V (60% duty cycle), with no minimum load requirement.

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

Yes. MP2153GQFU-15-P is fully lead-free, halogen-free, and compliant with the EU RoHS Directive 2011/65/EU. The UTQFN-6 package uses NiPdAu surface finish and meets JEDEC J-STD-020 moisture sensitivity level 2a (260°C reflow peak, floor life 4 weeks at ≤30°C/60% RH).

What failure protections are built into MP2153GQFU-15-P?

It integrates cycle-by-cycle overcurrent limiting (≥4A peak), hiccup-mode short-circuit protection, thermal shutdown (160°C), input UVLO (2.45V rising), output over-voltage protection (115% VFB trigger), and absolute VIN OVP (6.1V). All protections are fully autonomous and require no external components.