Monolithic Power Systems Inc. MP2153GTF-18-P

Overview

MP2153GTF-18-P from Monolithic Power Systems is a fixed-output, synchronous step-down DC/DC converter delivering 1.8V at up to 3A from a 2.5V–5.5V input. It integrates 65mΩ high-side and 35mΩ low-side MOSFETs, operates at 1.1MHz, achieves 25μA quiescent current in shutdown, and includes output discharge, VOUT OVP, and hiccup-mode short-circuit protection. It powers core rails in SSDs and portable instrumentation.

For engineers reviewing the MP2153GTF-18-P datasheet, MP2153GTF-18-P pinout, MP2153GTF-18-P application, or MP2153GTF-18-P equivalent, key selection criteria include fixed 1.8V output accuracy (±1% over temperature), SOT563 package thermal resistance (θJA = 80°C/W), EN-controlled sequencing, and compatibility with 1μH inductors and 22μF ceramic output capacitors.

Technical Context

The MP2153GTF-18-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 power stage enables continuous 3A output with minimal external components-only one inductor, two capacitors, and no feedback resistors due to the factory-trimmed 1.8V output.

It implements sleep mode for ultra-low IQ (25μA shutdown), dynamic VOUT over-voltage protection triggered at 115% of nominal (2.07V), and automatic output discharge via an internal 200Ω FET when EN is low. Thermal shutdown activates at 160°C with 30°C hysteresis.

Key Specifications

Pinout & Package

SOT563 (1.6mm × 1.6mm) package with 6-pin top-side layout and exposed thermal pad (not electrically connected). Pin 1 is GND; pin orientation follows JEDEC MO-252 standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS6286518RQYR and ADP5302AUJZ-1.8-R7, the MP2153GTF-18-P uniquely balances 3A capability, 25μA shutdown IQ, integrated output discharge, and SOT563 size-making it optimal for space-constrained, battery-sensitive 1.8V systems where full protection and moderate frequency are prioritized over maximum current or minimum IQ.

Availability

MP2153GTF-18-P is available at Aetrix Electronics and suitable for solid-state drives, portable instrumentation, battery-powered wireless nodes, and multi-function printer logic subsystems requiring stable component supply and long-term production continuity.

Supply support for MP2153GTF-18-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- and energy-constrained portable and storage applications-emphasizing integration, thermal efficiency, and robust fault protection in sub-2mm² packages.

FAQ

What is the recommended input capacitor for MP2153GTF-18-P?

A 10μF X5R/X7R ceramic capacitor placed within 2mm of the VIN and GND pins is required. This value ensures stable COT loop operation and suppresses high-frequency input ripple generated by the 1.1MHz switching node. A second 1μF capacitor in parallel improves high-frequency decoupling but is not mandatory for basic functionality.

Does MP2153GTF-18-P require external feedback resistors?

No. The MP2153GTF-18-P is a factory-trimmed fixed-output variant with internal feedback network set to 1.8V. Unlike adjustable versions (e.g., MP2153GTF), it has no FB pin and eliminates the need for external resistor dividers, reducing layout complexity and tolerance-related output error.

How does the power good (PG) pin behave during startup and fault conditions?

The PG pin remains low until VOUT reaches 90% of 1.8V (1.62V) and stays high only while VOUT remains between 1.62V and 2.07V. During OVP or undervoltage, PG pulls low within 150μs. It requires a 100kΩ–500kΩ pull-up to VIN or VOUT and sinks ≤0.4V at 1mA when asserted low.

Can MP2153GTF-18-P operate with a 1.5V input supply?

No. The absolute minimum operating input voltage is 2.5V, with UVLO rising threshold at 2.45V. At 1.5V, the device remains in under-voltage lockout and will not switch. For sub-2.5V inputs, consider boost-buck or LDO alternatives-not this buck converter.

What thermal derating applies to the SOT563 package at 70°C ambient?

On a standard 2-layer PCB (63mm × 63mm), θJA = 80°C/W. At 70°C ambient and 125°C max junction temperature, maximum allowable power dissipation is (125 − 70)/80 = 0.69W. With typical 90% efficiency at 3A/1.8V, this limits usable output current to approximately 2.3A before thermal shutdown triggers.

Is the output discharge feature active only when EN is low?

Yes. Output discharge is automatically enabled only when the EN pin is pulled below 0.4V (logic low). It is not active during normal operation, soft-start, or thermal shutdown. The internal 200Ω discharge FET connects OUT to GND, discharging a 22μF output cap from 1.8V to <100mV in ~1.2ms.

Does MP2153GTF-18-P support forced PWM or skip mode?

No. The MP2153GTF-18-P uses proprietary constant-on-time (COT) control with automatic transition between continuous conduction mode (CCM), discontinuous conduction mode (DCM), and sleep mode based on load. It does not offer user-selectable PWM/skip mode; light-load efficiency is managed autonomously via AAM and sleep entry.