Monolithic Power Systems Inc. MP2331HGTL-P

Overview

MP2331HGTL-P from Monolithic Power Systems is a fully integrated, synchronous buck converter delivering 2A continuous output current with 4.2V–24V input range, 1.2MHz switching frequency, and constant-on-time (COT) control for fast transient response in space-constrained power rails. It integrates 110mΩ/45mΩ high- and low-side MOSFETs, supports pre-bias start-up, and provides power-good indication in a thermally enhanced SOT583 package.

For engineers reviewing the MP2331HGTL-P datasheet, MP2331HGTL-P pinout, MP2331HGTL-P application, or MP2331HGTL-P equivalent, key selection considerations include COT-based loop stability, 200µA quiescent current under light load, programmable soft-start time via external capacitor, and thermal shutdown at 150°C with 20°C hysteresis.

Technical Context

The MP2331HGTL-P employs constant-on-time (COT) control with input- and output-voltage-dependent on-timer to maintain stable ~1.2MHz switching across 4.2V–24V input while enabling sub-100ns minimum off-time for high duty-cycle operation down to ~1V output. Its valley-current sensing OCP triggers hiccup-mode recovery upon overcurrent, and internal bootstrap charging sustains high-side gate drive without external diode.

It operates in forced continuous conduction mode (CCM) with dead-time control to prevent shoot-through, integrates a 7.3µA soft-start current source, and uses an open-drain PG pin with 87–92% UV and 115–125% OV thresholds referenced to 805mV FB voltage-enabling precise system sequencing and fault reporting.

Key Specifications

Pinout & Package

SOT583 (1.6mm × 2.1mm, 0.5mm pitch), thermally enhanced 8-pin package with exposed pad for improved heat dissipation in high-density layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2331HGTL-P, MP2331GTL-Z trades thermal capability for smaller footprint, while TPS562211RHLR offers higher current and fixed-frequency predictability at the cost of design flexibility and wide-input robustness.

Availability

MP2331HGTL-P is available at Aetrix Electronics and suitable for game consoles, digital set-top boxes, flat-panel television power supplies, and industrial human-machine interfaces requiring stable component supply with full production traceability.

Supply support for MP2331HGTL-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 power management ICs, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MP2331H product line delivers compact, high-efficiency synchronous buck converters for consumer and industrial applications demanding wide input range, fast transient response, and minimal external components.

FAQ

What is the minimum recommended input capacitance for MP2331HGTL-P?

A minimum 22µF X5R/X7R ceramic capacitor is required at the IN pin, placed directly adjacent to pins 2 and 4. This value ensures adequate high-frequency decoupling and limits input ripple to <100mV under 2A load steps. For 24V input, a second 10µF capacitor in parallel improves hold-up during line dips.

Can MP2331HGTL-P operate with a 3.3V input?

No - the absolute minimum input voltage is 4.2V per datasheet specifications. At 3.3V, the internal UVLO circuit prevents startup, and the bootstrap capacitor cannot charge sufficiently to drive the high-side MOSFET. Operation below 4.2V risks undefined behavior and potential damage during transient events.

How is the soft-start time calculated for a given capacitor value?

Soft-start time (T_SS) in milliseconds equals (C_SS in nF × 1.61) ÷ 1000, where C_SS is the capacitor connected from SS to GND. For example, a 100nF capacitor yields ~16ms ramp time. The internal 7.3µA current source charges the capacitor linearly until V_SS/2 exceeds the 805mV reference.

Does MP2331HGTL-P support forced discontinuous conduction mode (DCM)?

No - it operates exclusively in forced continuous conduction mode (CCM) with valley-current OCP. There is no DCM or pulse-skipping mode; switching remains at ~1.2MHz regardless of load. This ensures consistent EMI profile and eliminates low-frequency output ripple associated with light-load DCM.

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

The maximum output capacitance is limited by soft-start current and time: C_{O_MAX} ≈ (I_{LIM_AVG} − I_OUT) × T_SS / V_OUT. With 7.3µA SS current and 100ms soft-start, C_{O_MAX} is ~2200µF for a 3.3V/2A output. Exceeding this causes VOUT to rise too slowly, preventing FB from reaching regulation before SS completes.

Is the BST capacitor polarity-sensitive, and what dielectric is recommended?

Yes - the BST capacitor must be connected between BST and SW pins with correct orientation (no reverse voltage). X7R or X5R ceramic dielectrics are mandatory; Y5V or Z5U types exhibit excessive capacitance loss at DC bias and temperature, risking high-side driver failure due to insufficient bootstrap voltage.

How does the MP2331HGTL-P respond to a short-circuit event on the output?

Upon short-circuit detection via valley-current sensing, it enters hiccup mode: disables switching, discharges the SS capacitor, waits ~20ms, then attempts soft-start again. Each hiccup cycle lasts ~100ms. This limits average power dissipation to <1W during fault, preventing thermal runaway while allowing automatic recovery when fault clears.