Monolithic Power Systems Inc. MP2384GG-Z

Overview

MP2384GG-Z from Monolithic Power Systems is a fully integrated, synchronous buck converter delivering 4A continuous output current with 4.5V–24V input range, fixed 700kHz switching frequency, and 105μA quiescent current. It employs adaptive constant-on-time (COT) control, internal low-R_DS(ON) MOSFETs (60mΩ HS / 20mΩ LS), and remote differential sensing for tight line/load regulation in space-constrained power rails for security cameras and portable devices.

For engineers reviewing the MP2384GG-Z datasheet, MP2384GG-Z pinout, MP2384GG-Z application, or MP2384GG-Z equivalent, key selection considerations include its QFN-11 (2mm×2mm) thermal performance (θ_JA = 80°C/W), valley-current OCP threshold (4.5–8A), PG open-drain signaling, and compatibility with POSCAP/ceramic output capacitors without external ramp compensation.

Technical Context

The MP2384GG-Z implements adaptive COT control with DC auto-tune loop and remote differential sense to maintain ±1% load regulation across 0.01–4A and ±0.4% line regulation from 4.5V–24V input. Its valley-current sensing OCP uses the low-side MOSFET's R_DS(ON) as the current-sense element, enabling cycle-by-cycle protection without external components.

Operation transitions between PWM mode (CCM) above critical current (~1.2A at V_IN=12V, V_OUT=3.3V, L=3.3µH) and skip-mode DCM at light load, reducing switching losses and achieving >95% efficiency at 10mA with 12V input. Internal soft-start (1.1–2.3ms) and output discharge (40Ω) ensure controlled power-up and safe shutdown.

Key Specifications

Pinout & Package

MP2384GG-Z is housed in a thermally enhanced QFN-11 (2mm × 2mm, 0.5mm pitch) package with exposed thermal pad. The package supports 3.6W continuous power dissipation at +25°C ambient and requires solder paste stencil design per JESD51-7 for optimal θ_JC = 16°C/W performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with RT6220AGQW and TPS543320RHLR, MP2384GG-Z delivers higher output current (4A vs. 3.5A), lower quiescent current (105μA vs. 120μA), and integrated PG signaling-making it optimal for cost-sensitive, space-constrained, and sequenced analog/digital power domains where simplicity and reliability are prioritized over digital configurability.

Availability

MP2384GG-Z is available at Aetrix Electronics and suitable for security cameras, portable XDSL modems, and flat-panel monitor logic supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP2384GG-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 analog and power ICs, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MP2384 belongs to MPS's high-efficiency, low-I_Q buck converter product line, engineered for compact, thermally constrained applications in consumer, industrial, and networking equipment where minimal external components and fast transient response are critical.

FAQ

What is the minimum recommended output capacitance for stable operation?

The MP2384GG-Z is stable with ≥22µF ceramic output capacitance (X7R/X5R) and does not require external ramp compensation. For 3.3V/4A operation, a 22µF/16V X7R capacitor with ≤5mΩ ESR ensures <20mV peak-to-peak ripple and avoids subharmonic oscillation in CCM mode.

How does the valley-current OCP behave during short-circuit events?

During short-circuit, the MP2384GG-Z enters non-latching hiccup mode: valley-current limit (4.5–8A) triggers immediate cycle-by-cycle shutdown, causing V_OUT to collapse below 50% V_REF, which activates UVP-2 and initiates 32µs fault timer before automatic restart-limiting average power dissipation to <1W.

Can the MP2384GG-Z operate with an input voltage below 4.5V?

No-the absolute minimum operating input voltage is 4.5V due to VIN UVLO rising threshold (4.2–4.48V). Below this, the device remains disabled. For sub-4.5V inputs, consider the MP2317 (2.5V–6V range) or MP2338 (2.8V–18V range) as functional alternatives.

What is the purpose of the AGND pin, and how should it be routed?

AGND serves as the Kelvin reference for the FB pin, isolating feedback sensing from high-current PGND noise. It must be routed as a dedicated trace-never shared with PGND-and connected to the PGND plane at a single point near the FB resistor divider to prevent ground bounce from degrading output accuracy.

Does the MP2384GG-Z support pre-biased output startup?

Yes-the MP2384GG-Z features pre-bias startup protection: if the FB node is pre-charged above the internal V_REF ramp level at power-on, both HS and LS switches remain off until V_REF exceeds the sensed V_FB, preventing reverse current flow and ensuring monotonic output rise.

What is the maximum allowable BST capacitor value and dielectric type?

The BST capacitor must be 0.1µF nominal with X7R or X5R dielectric (10% tolerance, 16V rating). Larger values increase turn-on delay and reduce effective duty cycle at high VIN/VOUT ratios; Y5V or Z5U dielectrics are prohibited due to capacitance drift with voltage/temperature.

How does thermal shutdown recovery work after junction temperature exceeds 150°C?

Upon reaching 150°C, the MP2384GG-Z disables switching and holds shutdown until junction temperature falls to ~125°C (25°C hysteresis), then initiates internal soft-start (1.1–2.3ms) to ramp V_REF and restore regulated output-preventing thermal runaway while avoiding repeated cycling during marginal cooling conditions.