Monolithic Power Systems Inc. MP2393GTL-Z

Overview

MP2393GTL-Z from Monolithic Power Systems is a fully integrated, synchronous step-down DC/DC converter with internal 75mΩ/40mΩ MOSFETs, delivering up to 3A continuous output current across a 4.2V–24V input range. It features constant-on-time (COT) control, 650kHz switching frequency, power-good (PG) open-drain output, and programmable soft-start (SS), targeting compact power rails in game consoles and flat-panel displays.

For engineers reviewing the MP2393GTL-Z datasheet, MP2393GTL-Z pinout, MP2393GTL-Z application, or MP2393GTL-Z equivalent, key selection considerations include its SOT583 package footprint, COT-based transient response, PG logic thresholds (87–125% VREF), pre-bias start-up capability, and thermal shutdown at 150°C with 20°C hysteresis.

Technical Context

The MP2393GTL-Z implements a constant-on-time (COT) control architecture that dynamically adjusts off-time to maintain stable regulation across wide input and load variations, enabling fast load transient response without external compensation. Its integrated high-side and low-side N-channel MOSFETs operate in synchronous rectification mode, eliminating external diode losses and supporting >90% efficiency at 3A under 12V_IN/3.3V_OUT.

Internal bootstrap charging sustains gate drive for the high-side switch using a dedicated BST pin and external 1µF capacitor, while the PG pin provides open-drain status signaling referenced to 805mV internal V_REF, with rising/falling thresholds at 92%/87% (UV) and 120%/107% (OV) of V_REF. The SS pin accepts an external capacitor to set soft-start time per I_SS = 7.3µA.

Key Specifications

Pinout & Package

SOT583 (1.6mm × 2.1mm) thermally enhanced 8-pin package with exposed pad for improved PCB heat dissipation; pin 1 marked with dot, top-view orientation as specified in MPS documentation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2393GTL-Z, MP2333GTL-Z trades current capability for higher frequency and identical form factor, while RT7297CGE offers comparable current but omits PG and pre-bias features-making MP2393GTL-Z uniquely suited for sequenced, reliability-critical embedded power rails.

Availability

MP2393GTL-Z is available at Aetrix Electronics and suitable for game consoles, digital set-top boxes, flat-panel television power supplies, and industrial HMI controllers requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for MP2393GTL-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 design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MP2393 belongs to MPS's high-density synchronous buck converter product line, engineered for space-constrained consumer and industrial applications demanding ultra-small footprints, fast transient response, and robust protection without external compensation.

FAQ

What is the minimum recommended input capacitance for MP2393GTL-Z?

The datasheet specifies ≥22µF ceramic input capacitance (X5R/X7R dielectric) placed adjacent to the IN and GND pins. This value ensures RMS ripple current handling and limits input voltage ripple to <100mV under worst-case 2×V_OUT condition. Larger values improve hold-up time but require verification of ESR and physical placement.

Does MP2393GTL-Z support forced PWM mode?

No - MP2393GTL-Z operates exclusively in automatic PSM/PWM transition mode. At light loads, it enters power-save mode (PFM) to reduce quiescent current to 200µA; no external pin or register enables forced continuous conduction mode. This behavior is inherent to its COT architecture and cannot be overridden.

How is the soft-start time calculated for MP2393GTL-Z?

Soft-start time (T_SS) is determined by T_SS(ms) = (2 × V_REF × C_SS(nF)) / I_SS, where V_REF = 0.805V, I_SS = 7.3µA typical, and C_SS is the external capacitor on the SS pin. For example, a 100nF capacitor yields ~22ms ramp time. Layout parasitics may add minor delay.

Can MP2393GTL-Z regulate output voltages below 0.8V?

No - the internal reference is fixed at 789–821mV (typ. 805mV). Output voltage is set by V_OUT = V_REF × (1 + R1/R2); therefore, the practical minimum is ~0.8V. Attempting sub-0.8V regulation violates feedback accuracy and is not supported by design or characterization data.

What is the maximum allowable BST capacitor ESR?

The BST capacitor must be low-ESR ceramic (X5R/X7R), with ESR < 50mΩ recommended. Higher ESR causes excessive voltage droop during high-side switching, risking bootstrap undervoltage lockout and cycle skipping. A 1µF, 0603-size 10V X7R capacitor with <20mΩ ESR meets all operating conditions.

Is the PG pin compatible with 1.8V logic systems?

Yes - PG is an open-drain output with 0.4V max sink voltage at 1mA, allowing direct interface to 1.8V, 3.3V, or 5V logic. An external pull-up to the target logic rail is required; no level-shifter needed. Leakage current is <3µA, ensuring minimal standby power impact.

How does thermal shutdown interact with hiccup-mode OCP?

Thermal shutdown (150°C) and hiccup-mode OCP are independent protections. If OCP triggers first, hiccup cycles begin; if die temperature reaches 150°C during hiccup, thermal shutdown overrides and holds the part disabled until temperature falls to ~130°C, then resumes hiccup attempts. Both faults assert PG low.