Monolithic Power Systems Inc. MP2153DGQFU-P

Overview

MP2153DGQFU-P from Monolithic Power Systems is a synchronous step-down DC/DC converter with integrated 65mΩ high-side and 35mΩ low-side MOSFETs, delivering up to 3A continuous output current across a 2.5V–5.5V input range while regulating output down to 0.6V. It employs constant-on-time (COT) control for fast transient response and features fast output discharge, 1% FB accuracy, and 25μA quiescent current-enabling efficient power delivery in space-constrained SSD and portable battery-powered systems.

For engineers reviewing the MP2153DGQFU-P datasheet, MP2153DGQFU-P pinout, MP2153DGQFU-P application, or MP2153DGQFU-P equivalent, key selection considerations include its UTQFN-6 (1.2mm×1.6mm) package, 1.1MHz switching frequency, enable-controlled power sequencing, thermal shutdown at 160°C, and OVP/SCP/hiccup-mode protection architecture.

Technical Context

The MP2153DGQFU-P uses constant-on-time (COT) control with VIN feed-forward to maintain stable 1.1MHz switching frequency across input and output voltage variations. Its internal P-channel HS-FET and N-channel LS-FET are optimized for low R_DS(ON) (65mΩ/35mΩ), enabling high efficiency at light loads via AAM mode and deep sleep operation with clamped error amplifier.

It integrates zero-current detection (ZCD), 100ns minimum off-time, and dynamic output over-voltage regulation triggered at 115% of V_FB, with recovery initiated when V_FB falls below 105% of reference. The device enters hiccup-mode SCP upon exceeding 6A peak HS-FET current and discharges VOUT via a 13Ω internal resistor when EN is deasserted.

Key Specifications

Pinout & Package

MP2153DGQFU-P is housed in an ultra-compact UTQFN-6 package (1.2mm × 1.6mm, 0.4mm pitch, exposed thermal pad). Pin functions are validated per MPS datasheet Rev. 1.0 (2022).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2153DGQFU-P, the DGTF variant trades thermal performance for assembly flexibility, while the TPS62865RVL offers higher current and lower IQ but omits critical safety features like integrated discharge and 100% duty cycle-making MP2153DGQFU-P optimal for compact, thermally constrained, and safety-aware portable power designs.

Availability

MP2153DGQFU-P is available at Aetrix Electronics and suitable for solid-state drives, portable medical instruments, and battery-powered IoT nodes requiring stable component supply with guaranteed long-term manufacturability and RoHS-compliant packaging.

Supply support for MP2153DGQFU-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 expertise in DC/DC converters, LED drivers, and motor drivers since 1997.

The MP2153 series belongs to MPS's low-IQ synchronous buck converter product line, engineered specifically for space- and efficiency-critical portable and storage applications where thermal density and battery longevity are primary constraints.

FAQ

What is the maximum recommended PCB copper area for thermal management of MP2153DGQFU-P?

For continuous 3A operation at 25°C ambient, MPS recommends ≥120mm² of 2oz copper connected to the exposed thermal pad via ≥6 thermal vias (0.3mm diameter, filled or plated). This achieves ≤30°C temperature rise above ambient per EVL2153D-QFU-00A evaluation board data.

Does MP2153DGQFU-P support forced PWM mode, or is it limited to COT/AAM operation?

MP2153DGQFU-P operates exclusively in constant-on-time (COT) control with Advanced Asynchronous Modulation (AAM) for light loads. It does not support forced PWM or frequency synchronization; switching frequency varies slightly with VIN and VOUT but remains tightly centered at 1.1MHz under typical conditions.

Can the OUT pin be left unconnected if using only the FB pin for feedback regulation?

No. The OUT pin must be connected directly to the output rail. It serves dual roles: providing VOUT sense for the internal fast-discharge circuit and output over-voltage protection (OVP) comparator. Leaving it floating disables OVP and prevents proper discharge activation during shutdown.

What is the minimum output capacitance required for stable operation at 3A load?

MPS specifies ≥22µF ceramic output capacitance (X5R/X7R, 6.3V rating) with ≤5mΩ ESR for stable 1.2V/3A operation. Lower capacitance risks instability and excessive ripple; using two 10µF capacitors in parallel improves high-frequency decoupling and thermal derating margin.

How does the MP2153DGQFU-P behave during input undervoltage lockout (UVLO)?

When VIN drops below 2.3V (typical), the device disables switching and enters shutdown with 1μA current draw. It remains latched off until VIN rises above 2.45V (UVLO rising threshold) and EN is asserted high-preventing erratic restarts during brown-out conditions in battery-powered systems.

Is the 13Ω output discharge resistor active during normal regulation or only during shutdown?

The 13Ω discharge FET activates only when EN is pulled low (≤0.4V) or VIN falls below UVLO threshold. It is completely inactive during normal regulation, ensuring no parasitic load on the output rail and preserving efficiency across all operating conditions.

What is the recommended layout practice for the FB resistor divider to minimize noise coupling?

Place R1 and R2 as close as possible to the FB and GND pins, with the FB node routed away from SW and VIN traces. Use a guard ring tied to GND around the FB trace, and avoid routing beneath the IC or near high-dV/dt nodes to maintain ±1% regulation accuracy under EMI stress.