Monolithic Power Systems Inc. MP2153GTF-33-Z

Overview

MP2153GTF-33-Z from Monolithic Power Systems is a fixed-output 3.3V, 3A synchronous step-down DC/DC converter in SOT563 package, featuring 25μA quiescent current, 1.1MHz switching frequency, and integrated 65mΩ/35mΩ MOSFETs. It delivers high efficiency in battery-powered SSDs and portable instruments with output discharge, OVP, and hiccup-mode short-circuit protection.

For engineers reviewing the MP2153GTF-33-Z datasheet, MP2153GTF-33-Z pinout, MP2153GTF-33-Z application, or MP2153GTF-33-Z equivalent, key selection factors include its fixed 3.3V output accuracy (±1%), 2.5–5.5V input range, EN-controlled power sequencing, thermal shutdown at 160°C, and ultra-small SOT563 footprint for space-constrained designs.

Technical Context

The MP2153GTF-33-Z uses constant-on-time (COT) control with input voltage feed-forward to maintain stable 1.1MHz switching across its 2.5–5.5V input range. Its internal P-channel high-side (65mΩ) and N-channel low-side (35mΩ) MOSFETs enable up to 3A continuous output with 100% duty-cycle capability for low-dropout operation.

It integrates output discharge via an internal MOSFET (200Ω), VOUT over-voltage protection triggering at 115% of 3.3V (3.795V) with 10% hysteresis, and power-good indication (open-drain PG pin) active when FB remains within ±10%/+15% of 3.3V - exclusive to fixed-output variants like this one.

Key Specifications

Pinout & Package

SOT563 (1.6mm × 1.6mm) package with wettable flanks for automated optical inspection. Six-pin layout optimized for minimal PCB area and thermal resistance (θJA = 80°C/W on 2-layer board).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS6286513RTER and RT7295BGJ6F, the MP2153GTF-33-Z uniquely balances ultra-low IQ (30μA), integrated PG and discharge, and SOT563 size - making it optimal for space- and battery-life-constrained 3.3V systems where reliability trumps raw current headroom.

Availability

MP2153GTF-33-Z is available at Aetrix Electronics and suitable for solid-state drives, portable instruments, and battery-powered devices requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP2153GTF-33-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, founded in 1997 and headquartered in Kirkland, Washington.

The MP2153 product line targets ultra-compact, low-power DC/DC conversion for portable and storage applications - emphasizing minimal external components, nanoscale quiescent current, and robust protection in sub-2mm² packages.

FAQ

What is the purpose of the FB pin on MP2153GTF-33-Z?

The FB pin is internally connected to the fixed 3.3V reference and must be left unconnected per the datasheet. Unlike adjustable versions, it serves no external feedback function - all regulation is handled internally, eliminating resistor divider placement errors and leakage current concerns.

Does MP2153GTF-33-Z require an external pull-up resistor on the PG pin?

Yes. The PG pin is open-drain and requires an external pull-up resistor (100kΩ to 500kΩ) to VIN or VOUT to generate a valid logic-high signal. Without it, PG remains floating and cannot indicate proper output regulation to host controllers or FPGAs.

Can MP2153GTF-33-Z operate with input voltage below 2.5V?

No. The absolute minimum operating input is 2.5V, with UVLO rising threshold at 2.45V (typical). Below this, the device remains disabled. It cannot sustain regulation at 2.3V or lower, even with 100% duty cycle, due to internal bias limitations.

How does output discharge work during shutdown?

When EN is pulled low, the internal discharge MOSFET (200Ω) connects OUT to GND, actively discharging the output capacitor. This prevents residual voltage from interfering with system reset sequencing or causing latch-up in downstream logic - critical for hot-swap and battery-backed systems.

Is thermal derating required for continuous 3A operation?

Yes. At ambient temperatures above 60°C, output current must be reduced per the derating curve (Figure 9). With 2-layer PCB and no airflow, max continuous current drops to ~2.2A at 85°C ambient to maintain TJ ≤ 125°C, based on θJA = 80°C/W and 1.5W max power dissipation.

What is the minimum recommended output capacitance?

The datasheet specifies 22μF ceramic (X5R/X7R) as the minimum for stable operation with 1μH inductor. Using less capacitance risks instability, excessive ripple (>50mV pk-pk), and failure to meet PG assertion timing due to slow VOUT rise during soft-start.

Does MP2153GTF-33-Z support forced PWM mode?

No. It operates exclusively in COT control with automatic transition between CCM, DCM, and sleep mode. There is no pin or register to force continuous PWM - light-load efficiency relies on AAM and sleep-mode activation, which reduce switching losses at sub-10mA loads.