Monolithic Power Systems Inc. MP2324GJ-P

Overview

MP2324GJ-P from Monolithic Power Systems is a synchronous step-down DC-DC converter IC integrating 120mΩ high-side and 50mΩ low-side MOSFETs, delivering 2A continuous output current across 4.5V–24V input range with fixed 500kHz switching frequency and 0.8V adjustable output voltage. It operates in peak-current-mode control with internal soft-start, power-good indicator, and hiccup-mode overcurrent protection-used in notebook I/O power rails where compact size and thermal robustness are critical.

For engineers reviewing the MP2324GJ-P datasheet, MP2324GJ-P pinout, MP2324GJ-P application, or MP2324GJ-P equivalent, key selection criteria include its TSOT23-8 package footprint, 150°C thermal shutdown threshold, 791mV feedback reference voltage, and EN/SYNC dual-function pin supporting external clock synchronization from 200kHz to 2MHz.

Technical Context

The MP2324GJ-P employs fixed-frequency peak-current-mode control with internal compensation, enabling stable regulation under wide line/load transients without external loop components. Its integrated 120mΩ/50mΩ MOSFET pair supports up to 95% duty cycle and delivers >92% efficiency at 12V_IN/3.3V_OUT/2A.

It features AAM (Advanced Asynchronous Modulation) for light-load PFM operation, a 40μs-delayed open-drain PG signal referenced to 90% of V_FB, and bootstrap charging circuitry requiring an external BST capacitor between SW and BST pins to sustain high-side gate drive above VIN.

Key Specifications

Pinout & Package

MP2324GJ-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 (not electrically connected). Pin 1 is marked by a dot; top marking reads "AHV".

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2324GJ-P, MP2315GJ-Z trades 0.5A output and SYNC capability for lower cost in non-synchronized 1.5A applications, while RT6220AGQW offers higher 600kHz frequency and tunable compensation but removes PG functionality and increases design complexity.

Availability

MP2324GJ-P is available at Aetrix Electronics and suitable for notebook I/O power, industrial HMI subsystems, and flat-panel monitor logic supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP2324GJ-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 mixed-signal ICs for power management, motion control, and automotive applications.

The MP2324 belongs to MPS's high-efficiency DC-DC converter product line, designed specifically for space-constrained consumer and industrial systems needing integrated power stages, robust protection, and minimal external component count.

FAQ

What is the minimum recommended input capacitance for MP2324GJ-P?

A 22μF X5R/X7R ceramic capacitor is required at the IN pin, placed within 1mm using wide traces and ≥2 vias to ground. This value ensures RMS current handling exceeds 1A and limits input ripple to <100mV at 2A load, preventing instability due to insufficient charge reservoir during high-duty-cycle operation.

Can MP2324GJ-P operate with an input voltage below 4.5V?

No. The absolute minimum operating input is 4.5V per datasheet specifications. Below this, the internal UVLO circuit disables the regulator at 3.9V rising threshold, and the VCC regulator cannot sustain 4.9V bias-causing functional failure and potential latch-up if forced below 3.7V.

How does the EN/SYNC pin function in synchronization mode?

When driven with a clean 200kHz–2MHz square wave, the EN pin overrides the internal oscillator on each rising edge. The internal clock resets and aligns to the external signal, maintaining fixed 500kHz operation only when no external clock is present. Pulse width must stay under 1.6μs to avoid unintended re-triggering.

What is the purpose of the BST capacitor, and what value is recommended?

The BST capacitor (0.1μF–1μF, X7R ceramic) forms a charge pump between SW and BST pins to generate a floating voltage ≥VIN+5V, enabling full enhancement of the high-side MOSFET gate. Its value balances bootstrap voltage droop (larger C) against layout parasitics (smaller C); 0.1μF is standard for 500kHz operation.

Does MP2324GJ-P require an external bootstrap diode?

An external Schottky diode (e.g., IN4148) from VCC to BST is optional and recommended only when V_OUT ≥ 3.3V and duty cycle >65% (i.e., V_IN > 5V). It improves bootstrap efficiency by reducing voltage drop across the internal charging path, increasing reliability under high-VIN/high-VOUT conditions.

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

With a precision resistor divider (0.5% tolerance), output voltage accuracy is ±1.5% over –40°C to +125°C junction temperature and 0–2A load range. This includes ±1% from FB reference (783–799mV), ±0.3% from divider ratio error, and ±0.2% from layout-induced FB node leakage.

How does hiccup-mode overcurrent protection behave during a sustained short circuit?

Upon detecting inductor current >3.5A, MP2324GJ-P enters hiccup mode: it shuts down for ~10ms, then attempts restart. If short persists, it repeats the cycle, limiting average short-circuit current to ~300mA and die temperature to <130°C-preventing thermal runaway without requiring external current-limit circuitry.