Monolithic Power Systems Inc. MP2325GJ-P

Overview

MP2325GJ-P from Monolithic Power Systems is a synchronous step-down DC-DC converter IC with integrated 90mΩ/40mΩ MOSFETs, delivering 3A continuous output current across 4.5V–24V input range, fixed 500kHz switching frequency, and adjustable 0.8V–VIN×0.95 output voltage - deployed in notebook I/O power rails and flat-panel display bias supplies.

For engineers reviewing the MP2325GJ-P datasheet, MP2325GJ-P pinout, MP2325GJ-P application, or MP2325GJ-P equivalent, key selection criteria include internal MOSFET R_DS(on), thermal shutdown threshold (150°C), power-good indicator timing (40μs delay), and EN/SYNC dual-function pin behavior under external clock synchronization.

Technical Context

The MP2325GJ-P employs peak-current-mode control with internal 0.8V reference and optimized compensation, enabling stable regulation without external loop components. Its AAM (Advanced Asynchronous Modulation) light-load mode reduces quiescent current to 130μA while maintaining output accuracy via pulse-frequency modulation.

It integrates a bootstrap regulator for high-side gate drive, supports external clock synchronization from 200kHz to 2MHz on the EN/SYNC pin, and features hiccup-mode overcurrent protection triggered when FB falls below 50% of V_REF, limiting average short-circuit current during fault conditions.

Key Specifications

Pinout & Package

MP2325GJ-P is housed in an 8-pin TSOT23 package (2.9mm × 1.6mm × 0.85mm), optimized for high-density PCB layouts with exposed thermal pad connected to GND for enhanced heat dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with RT6220AGQW and TPS54331DR, MP2325GJ-P delivers lower system-level BOM cost and smaller footprint due to fully integrated MOSFETs and single-chip solution, while offering superior light-load efficiency via AAM mode and tighter output voltage tolerance (±1.2% vs. ±1.5%).

Availability

MP2325GJ-P is available at Aetrix Electronics and suitable for notebook I/O power, digital set-top box AVDD generation, and flat-panel monitor bias supplies requiring stable component supply, consistent parametric performance, and long-lifecycle availability.

Supply support for MP2325GJ-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 analog and power ICs, headquartered in California and serving global industrial, computing, and consumer markets.

The MP2325 belongs to MPS's high-efficiency DC-DC converter product line, designed specifically for space-constrained, thermally demanding applications where integrated power stages and advanced light-load management are critical.

FAQ

What is the maximum recommended output voltage for MP2325GJ-P?

The MP2325GJ-P supports output voltages from 0.8V up to 95% of the input voltage (V_IN × 0.95). At 24V input, this yields a maximum practical output of 22.8V. The feedback reference is 791mV ±8mV, and output accuracy depends on resistor divider tolerance and layout parasitics.

Does MP2325GJ-P require an external bootstrap diode?

An external bootstrap diode is optional and recommended only when duty cycle exceeds 65% (e.g., 12V→5V or 19V→5V), where internal charging may be insufficient. For 12V→3.3V (27.5% duty), the internal path suffices; IN4148 is the preferred diode if added.

How does the EN/SYNC pin behave during external clock synchronization?

When an external clock (200kHz–2MHz) is applied to EN/SYNC, the internal oscillator locks to its rising edge within 2ms of startup. EN logic high must exceed 2V and low must fall below 400mV; pulse widths must stay under 1.6μs (high) and 6μs (low) to avoid unintended shutdown or mis-triggering.

What is the thermal resistance (θ_JA) of the TSOT23-8 package under standard JEDEC 4-layer PCB conditions?

The MP2325GJ-P in TSOT23-8 exhibits θ_JA = 100°C/W and θ_JC = 55°C/W when mounted on a JEDEC-standard 4-layer PCB per JESD51-7. Achieving this requires a solid GND thermal pad connection with ≥4 thermal vias directly beneath the exposed pad.

Can MP2325GJ-P operate with input voltage below 4.5V?

No - the absolute minimum operating input is 4.5V per datasheet specifications. Below this, UVLO prevents startup; the rising threshold is 3.9V ±0.2V, but functional operation begins only above 4.5V. Input below 4.5V results in no switching and zero output.

What happens during output short-circuit condition?

Under sustained short, MP2325GJ-P enters hiccup mode: it cycles between brief startup attempts and shutdown. This occurs after FB drops below 400mV, triggering fold-back frequency reduction and eventual UV detection. Average short-circuit current remains below 1A, limiting thermal stress.

Is the PG pin actively driven or open-drain?

The PG pin is strictly open-drain. It requires an external pull-up resistor to V_CC (typically 10kΩ–100kΩ). It asserts high when FB reaches ≥90% of regulation voltage, with 40μs delay; it pulls low internally when FB falls ≤85%, enabling precise power sequencing in multi-rail systems.