Monolithic Power Systems Inc. MP2333HGTL-Z

Overview

MP2333HGTL-Z from Monolithic Power Systems is a fully integrated 4.2–18V input, 3A synchronous buck converter with constant-on-time (COT) control, 1.2MHz switching frequency, power-good (PG) open-drain output, and programmable soft-start - delivering tight regulation and fast transient response in a 1.6×2.0mm SOT583 package for compact DC/DC point-of-load conversion in consumer electronics.

For engineers reviewing the MP2333HGTL-Z datasheet, MP2333HGTL-Z pinout, MP2333HGTL-Z application, or MP2333HGTL-Z equivalent, this device supports design of high-efficiency, space-constrained power rails requiring pre-bias start-up, hiccup-mode over-current protection, forced PWM operation, and thermal shutdown at 150°C.

Technical Context

The MP2333HGTL-Z implements constant-on-time (COT) control with input- and output-voltage-dependent on-timer to maintain ~1.2MHz switching across 4.2–18V input while enabling sub-100ns minimum off-time extension down to 280kHz for improved dropout. Its integrated 75mΩ/40mΩ HS/LS MOSFETs operate in forced CCM with internal dead-time control to prevent shoot-through.

Power sequencing is managed via EN pin with 1.23V rising threshold and 100mV hysteresis, PG output with 92% VREF rising and 87% VREF falling thresholds, and SS pin driven by a 7.3μA current source to program soft-start time - all coordinated with internal bias regulation, bootstrap charging, and valley-current OCP detection during LS-FET conduction.

Key Specifications

Pinout & Package

SOT583 (1.6mm × 2.0mm) thermally enhanced 8-pin package with exposed pad for PCB thermal relief; pin 1 marked with dot, top-side marking "BCJ".

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2333GQKT-Z, the MP2333HGTL-Z offers tighter thermal performance and critical PG functionality in half the footprint; versus TPS54331DR, it delivers superior integration, smaller size, and lower quiescent current - making it optimal for space- and efficiency-constrained 12V/18V consumer power rails.

Availability

MP2333HGTL-Z is available at Aetrix Electronics and suitable for game consoles, digital set-top boxes, flat-panel television power supplies, and USB-C powered peripherals requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP2333HGTL-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 MP2333H product line targets compact, high-efficiency DC/DC conversion for consumer electronics, emphasizing minimal external components, robust protection, and seamless integration into space-constrained PCB layouts.

FAQ

What is the maximum recommended output capacitance for stable soft-start behavior?

The MP2333HGTL-Z limits maximum output capacitance to ensure the soft-start capacitor charges fully before regulation begins. For a 3.3V output with 3A load, Co_max ≈ (I_{LIM_AVG} − I_OUT) × T_SS / V_OUT. With typical 7.3μA SS current and 1ms soft-start time, Co_max is ~220μF for 3.3V - exceeding this risks failure to reach regulation.

Does the MP2333HGTL-Z support automatic frequency foldback under heavy load or low input voltage?

Yes - the MP2333HGTL-Z implements TON extension: when minimum off-time (190ns) is reached, on-time increases to maintain regulation, reducing switching frequency from 1.2MHz down to 280kHz. This preserves output voltage accuracy during input droop without entering dropout.

How is bootstrap capacitor sizing determined for reliable high-side gate drive?

A 1μF X7R ceramic capacitor is specified between BST and SW pins. It must sustain >3.3V during HS-FET conduction and recharge fully during LS-FET conduction. Layout must minimize BST-SW loop inductance; insufficient capacitance causes HS-FET turn-off delay and efficiency loss.

Can the MP2333HGTL-Z operate with an output voltage below 0.8V?

No - the internal feedback reference is fixed at 805mV ±16mV. Output voltages below 0.8V cannot be regulated because the error amplifier lacks headroom to drive the comparator. The minimum valid V_OUT is 0.8V, set by V_REF × (1 + R1/R2).

What is the purpose of the 1nF capacitor recommended on the PG pin?

The 1nF capacitor decouples the PG open-drain output from noise coupling through the pull-up network. Without it, fast transients on adjacent traces can falsely trigger PG glitches, causing premature system enable or spurious resets during load steps.

Is the EN pin compatible with 3.3V logic without level shifting?

Yes - the EN pin has a 1.23V rising threshold with 100mV hysteresis and draws only 2μA at 2V. A standard 3.3V GPIO can directly drive EN high; internal 2.8V Zener clamping prevents damage even if pulled to 5V or 12V via resistor.

How does the valley-current OCP differ from peak-current limiting in this device?

Valley-current OCP monitors inductor current during LS-FET conduction (when current is lowest). When sensed valley current exceeds 2.8–4A, the controller enters hiccup mode - unlike peak limiting, this avoids false triggering during normal ripple and improves short-circuit energy handling.