Monolithic Power Systems Inc. MP2328CGTL-Z

Overview

MP2328CGTL-Z from Monolithic Power Systems is a synchronous step-down DC/DC converter delivering 2A continuous output current with 450kHz switching frequency, integrated 130mΩ/60mΩ MOSFETs, power-good (PG) indication, configurable soft-start, and forced continuous conduction mode (FCCM). It operates across 4.5V–28V input and supports 0.5V–16V output, targeting compact, high-efficiency power rails in game consoles and flat-panel displays.

For engineers reviewing the MP2328CGTL-Z datasheet, MP2328CGTL-Z pinout, MP2328CGTL-Z application, or MP2328CGTL-Z equivalent, key selection criteria include its COT control architecture for fast transient response, ±1.5% reference accuracy over temperature, SOT583 thermal performance (θJA = 55°C/W), and PG logic timing thresholds tied to 90–112% of VREF.

Technical Context

The MP2328CGTL-Z employs constant-on-time (COT) control with VIN- and VOUT-dependent on-timer adjustment to maintain stable 450kHz switching across wide input ranges. Its internal high-side and low-side N-channel MOSFETs operate with dead-time control to prevent shoot-through, while FCCM ensures continuous inductor current under all load conditions.

Power-good signaling uses open-drain PG with dual threshold hysteresis (rising: 90% VREF; falling: 84% VREF) and 12μs rising / 20μs falling delay. Soft-start is implemented via 7.5μA internal current source charging an external capacitor, overriding VREF until regulation is established.

Key Specifications

Pinout & Package

SOT583 package: 1.6mm × 2.1mm, 0.5mm pitch, thermally enhanced with exposed pad (GND-connected). Optimized for high-density layouts and efficient heat dissipation in space-constrained applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2328CGTL-Z, MP2328GTL-Z trades thermal headroom for size reduction, while TPS54202DRCT sacrifices COT responsiveness and system-level PG signaling for broader vendor support - neither matches the integrated PG+FCCM+COT combination in SOT583.

Availability

MP2328CGTL-Z 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 MP2328CGTL-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, with over two decades of expertise in DC/DC conversion, motor drivers, and LED lighting controllers.

The MP2328C belongs to MPS's high-efficiency synchronous buck converter product line, designed specifically for space-constrained, thermally demanding applications where integration, reliability, and fast transient response are critical.

FAQ

What is the minimum recommended input capacitance for MP2328CGTL-Z at 24V input and 5V/2A output?

A minimum 10μF X5R/X7R ceramic capacitor is required at the VIN pin, placed directly adjacent to pins 2 and 4. At 24V→5V/2A, input RMS ripple current reaches ~1.4A; therefore, a 1210-size 10μF/25V part with ≥2A ripple rating (e.g., TDK C3225X5R1E106K) is recommended to ensure stability and longevity.

Can MP2328CGTL-Z operate with a pre-biased output during startup?

Yes - the MP2328CGTL-Z supports monotonic pre-biased start-up. Its bootstrap circuit refreshes VBST even when VOUT is initially present, and the SS capacitor charges independently. This prevents reverse current flow and ensures controlled ramp-up without output voltage undershoot or oscillation.

How does the PG pin behave when pulled up to a voltage other than VOUT?

If PG is pulled up to a fixed rail (e.g., 3.3V or 5V), it will not de-assert (go low) when VIN drops below operational threshold - potentially misleading downstream logic. For correct fault detection, PG must be pulled up to VOUT so that PG goes low when VOUT collapses due to input failure or overload.

What is the maximum achievable output voltage accuracy over temperature and line/load conditions?

Output voltage accuracy is dominated by the ±1.5% internal reference tolerance over -40°C to +125°C, plus resistor divider tolerance and FB pin current error (<50nA). With 0.5% resistors and proper layout, total system accuracy remains within ±2.2% across full operating range - sufficient for most digital logic and analog sensor supplies.

Does MP2328CGTL-Z require external compensation components?

No - the constant-on-time (COT) control architecture eliminates the need for external compensation networks. The loop is inherently stable across all input voltages, output loads, and output capacitors meeting the recommended ESR and capacitance ranges specified in the datasheet.

What is the thermal performance difference between SOT583 and SOT563 packages under 2A load?

In a standard 2-layer JEDEC board, SOT583 achieves θJA = 55°C/W versus 130°C/W for SOT563. At 2A/5V, power dissipation is ~0.3W; this yields ~16.5°C rise in SOT583 vs. ~39°C in SOT563 - making SOT583 essential for sustained 2A operation without derating.

How is over-current protection implemented, and what happens during a short-circuit event?

OCP triggers when valley inductor current exceeds 1.9–3.6A (typical 2.75A). The device enters hiccup mode: disabling switching, discharging SS capacitor, then attempting soft-start every ~20ms. PG goes low during hiccup, and recovery occurs only after fault removal - preventing thermal runaway during sustained shorts.