Monolithic Power Systems Inc. MP2328GTL-P

Overview

MP2328GTL-P from Monolithic Power Systems is a fully integrated, synchronous step-down DC/DC converter with internal 130mΩ/60mΩ MOSFETs, delivering up to 2A continuous output current across 4.5V–28V input and 0.5V–16V output ranges. It employs constant-on-time (COT) control for fast transient response, features power good (PG) indication, hiccup-mode over-current protection, and operates in SOT583 package for space-constrained power rails in consumer electronics.

For engineers reviewing the MP2328GTL-P datasheet, MP2328GTL-P pinout, MP2328GTL-P application, or MP2328GTL-P equivalent, key selection criteria include its 450kHz switching frequency, ±1.5% reference accuracy over temperature, 160µA quiescent current, thermal shutdown at 150°C, and support for pre-biased start-up - all critical for stable, compact, high-efficiency point-of-load regulation.

Technical Context

The MP2328GTL-P uses constant-on-time (COT) control architecture with input- and output-voltage-dependent on-timer to maintain stable 350–550kHz switching across wide VIN/VOUT combinations. Its internal high-side and low-side N-channel MOSFETs operate in synchronous rectification mode, with dead-time control preventing shoot-through and enabling >92% efficiency at 24V→5V/2A.

It integrates full protection logic: valley-current-based OCP with hiccup recovery, under-voltage lockout on VIN (3.96V rising threshold), EN-controlled enable/disable with 1.2V threshold, and open-drain PG output referenced to 500mV internal VREF with 90–112% valid window and 12/20µs rise/fall delays.

Key Specifications

Pinout & Package

SOT583 is an 8-pin, 1.6mm × 2.1mm, 0.5mm pitch thermally enhanced package with exposed thermal pad. Pin 1 marked by dot; top view orientation per MPS datasheet Rev. 1.0.

Key Features

Applications

Equivalent & Alternatives

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

Compared with RT6220AGQW and TPS54202DRCT, MP2328GTL-P delivers superior light-load efficiency via PFM skip mode, tighter thermal protection (150°C vs. 165°C), and smaller SOT583 footprint - making it optimal for space- and efficiency-critical consumer power rails.

Availability

MP2328GTL-P is available at Aetrix Electronics and suitable for game consoles, multi-function printers, power meters, and flat panel televisions requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for MP2328GTL-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 centers in the US, China, and Taiwan, and global distribution since 1997.

The MP2328 belongs to MPS's high-density DC/DC converter product line, engineered for compact, efficient, and robust point-of-load regulation in consumer, industrial, and computing applications where thermal and layout constraints dominate.

FAQ

What is the minimum recommended output capacitance for MP2328GTL-P?

The datasheet specifies ≥22µF ceramic output capacitance (e.g., two 10µF X5R in parallel) to ensure stability and limit output ripple below 20mV peak-to-peak at 2A load. Lower values risk instability under COT control, especially with high-ESR capacitors or long PCB traces.

Can MP2328GTL-P operate with a 3.3V input?

No. The absolute minimum input voltage is 4.5V, with UVLO rising threshold at 3.96V. At 3.3V, the device remains disabled and draws only 2–10µA shutdown current. For sub-4.5V inputs, consider MP2317 or MP2332 series.

How does the BST capacitor value affect performance?

A 0.1µF ceramic capacitor between BST and SW is mandatory. Values <0.082µF cause insufficient gate drive voltage during high-duty-cycle operation, leading to HS-FET overheating; values >0.22µF delay bootstrap recharge and may cause cycle skipping at light loads.

Is the PG pin compatible with 3.3V logic systems?

Yes - PG is open-drain and requires external pull-up. Pulling PG to 3.3V (not VIN) ensures valid low-state assertion during input failure. With 3.3V pull-up and 4.7kΩ resistor, sink current stays within 4mA spec while providing clean 0–3.3V logic-compatible signaling.

Does MP2328GTL-P support forced PWM mode?

No. It automatically transitions between CCM (heavy load), PFM/skip mode (light load), and hiccup mode (fault). There is no pin or register to force continuous PWM; this is inherent to its COT architecture and power-save design.

What is the maximum allowable PCB copper area for thermal relief in SOT583?

MPS recommends ≥100mm² of 2oz copper connected to the exposed thermal pad via ≥6 thermal vias (0.3mm diameter) to internal ground planes. This achieves θJA ≈ 55°C/W on a 2-layer 63.5mm × 63.5mm board, enabling full 2A output at TA = 85°C.

Can the SS pin be left floating?

No. Floating SS causes uncontrolled start-up with potential output overshoot or oscillation. If soft-start is not required, connect SS directly to GND to force immediate regulation - but verify system tolerance to inrush current and transient stress.