Monolithic Power Systems Inc. MP2392GTL-Z

Overview

MP2392GTL-Z from Monolithic Power Systems is a fully integrated, synchronous step-down DC/DC converter with internal 110mΩ/45mΩ MOSFETs, delivering 2A continuous output current across a 4.2V–24V input range. It employs constant-on-time (COT) control for fast transient response and tight regulation, features power-good (PG) indication and programmable soft-start, and targets point-of-load conversion in compact consumer electronics.

For engineers reviewing the MP2392GTL-Z datasheet, MP2392GTL-Z pinout, MP2392GTL-Z application, or MP2392GTL-Z equivalent, key selection criteria include its 650kHz switching frequency, 200µA quiescent current in active mode, 10µA shutdown current, SOT583 package footprint (1.6mm × 2.1mm), and integrated protection including OCP, OVP, UVP, and thermal shutdown.

Technical Context

The MP2392GTL-Z uses a constant-on-time (COT) control architecture with valley-current sensing to achieve rapid load transient response and stable operation without external compensation. Its internal high-side and low-side N-channel MOSFETs are optimized for low conduction loss (R_DS(ON) = 110mΩ / 45mΩ), enabling high efficiency across 0.01A–2A loads.

It integrates bootstrap charging for the high-side gate driver, supports pre-bias start-up, and implements hiccup-mode over-current protection triggered at 2.5A valley current limit. The PG pin provides open-drain status signaling referenced to 87–125% of the 805mV internal reference voltage, with 50µs rising and 35µs falling delays.

Key Specifications

Pinout & Package

SOT583 package: ultra-compact 1.6mm × 2.1mm, 8-pin, exposed pad for thermal performance. Pin 1 marked with dot; top marking "AZT" per datasheet.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2392GTL-Z, MP2332HGTL-Z trades current capability for wider input headroom at lower load, while TPS54202DRCT offers mature current-mode stability at the cost of board area and design complexity - neither matches the MP2392's combination of 24V tolerance, 650kHz speed, and SOT583 miniaturization.

Availability

MP2392GTL-Z is available at Aetrix Electronics and suitable for game consoles, digital set-top boxes, flat-panel televisions, and industrial human-machine interfaces requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP2392GTL-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 MP2392 belongs to MPS's high-frequency synchronous buck converter product line, engineered for space-constrained consumer and industrial applications demanding high efficiency, fast transient response, and minimal external components.

FAQ

What is the minimum recommended input capacitance for MP2392GTL-Z?

The datasheet specifies ≥22µF ceramic input capacitance (X5R/X7R dielectric) placed adjacent to the IN and GND pins. This value ensures adequate high-frequency decoupling and limits input ripple under worst-case conditions (e.g., VIN = 2×VOUT). For 19V input, a 22µF/25V X7R capacitor with low ESL is standard; parallel 1µF and 0.1µF ceramics further suppress switching noise.

Can MP2392GTL-Z operate with an output voltage below 0.8V?

No. The internal reference voltage is fixed at 805mV ±2%, and the feedback amplifier is designed for regulation only above this threshold. Output voltages below 0.8V are not supported - attempting to set VOUT < 0.8V results in loss of regulation and unpredictable PG behavior. Minimum guaranteed output is 0.8V per absolute maximum ratings.

How does the MP2392GTL-Z handle startup into a pre-biased output?

It supports monotonic pre-bias start-up: when VOUT is already present at power-on, the BST capacitor is refreshed via internal charge pump, and the SS voltage ramps only after VSS/2 exceeds the sensed FB voltage. This prevents reverse current flow through the low-side MOSFET and avoids output voltage collapse or overshoot during hot-insertion scenarios.

What is the purpose of the 1µF capacitor required between BST and SW pins?

This capacitor forms the floating supply for the high-side gate driver. During the low-side conduction phase, it charges via the internal bootstrap diode from IN. When the high-side switch turns on, it provides the gate-source voltage needed to fully enhance the 110mΩ N-channel MOSFET. Using a 1µF X7R ceramic capacitor ensures low ESR and stable voltage under 650kHz switching.

Is the PG pin compatible with 1.8V logic systems?

Yes - PG is an open-drain output requiring an external pull-up. To interface with 1.8V logic, connect the pull-up resistor to a 1.8V supply. The PG sink capability is specified at 1mA with ≤0.4V drop, ensuring clean low-level assertion. Do not pull up to >3.6V, as PG leakage current increases above that voltage.

Does MP2392GTL-Z require external compensation components?

No. The constant-on-time (COT) control architecture is inherently stable and does not require external compensation networks (e.g., type-II/type-III compensators). Loop stability is maintained across all operating conditions by the internal one-shot timer and valley-current sensing - simplifying layout and reducing bill-of-materials.

What is the maximum allowable output capacitance before soft-start failure occurs?

Per Equation (13) in the datasheet, C_{O_MAX} ≈ (I_{LIM_AVG} − I_OUT) × T_SS / V_OUT. With typical 7.3µA SS current and 2A load, exceeding ~470µF risks incomplete soft-start ramp due to insufficient charge current. Recommended maximum is 330µF ceramic or POSCAP for reliable 3.3V/2A startup within 5ms.