Monolithic Power Systems Inc. MP4562GJ-P

Overview

MP4562GJ-P from Monolithic Power Systems is a 60V-input, 2A synchronous step-down DC/DC converter with integrated high-side MOSFET, peak current mode control, and configurable switching frequency from 100kHz to 2.5MHz in TSOT23-8 package. It delivers regulated 0.8–30V output across 4.5–60V input, supports PoE PD and industrial power rails, and features internal compensation for stable loop design without external components.

For engineers reviewing the MP4562GJ-P datasheet, MP4562GJ-P pinout, MP4562GJ-P application, or MP4562GJ-P equivalent, key selection considerations include its 120mΩ HS-FET R_DS(ON), 30μA quiescent current, frequency foldback under short-circuit, 99% duty-cycle low-dropout operation, and TSOT23-8 thermal performance (θ_JA = 100°C/W).

Technical Context

The MP4562GJ-P implements fixed-frequency peak current mode control with internal ramp compensation to prevent subharmonic oscillation above 50% duty cycle. Its error amplifier compares FB voltage against a precision 0.8V reference and drives V_COMP to regulate switch conduction time.

It integrates a bootstrap gate driver for the high-side MOSFET, with automatic BST refresh when V_BST–V_SW drops below 2.3V. Protection logic includes cycle-by-cycle current limiting, frequency foldback at 50% V_REF, FB OVP at 110% V_REF, and OTP shutdown at 150°C with 20°C hysteresis.

Key Specifications

Pinout & Package

MP4562GJ-P is housed in a thermally enhanced TSOT23-8 package (2.9mm × 1.6mm × 0.85mm), optimized for high-power density and PCB area savings in space-constrained applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM5164QWRNXTQ1 and TPS54260DGQR, MP4562GJ-P uniquely combines 60V rating, 2A capability, TSOT23-8 size, and integrated fault-foldback in a single monolithic device-making it optimal for space-constrained, wide-input industrial and PoE PD designs where reliability under overload is critical.

Availability

MP4562GJ-P is available at Aetrix Electronics and suitable for industrial power rails, non-isolated PoE powered devices, telecom line cards, and wide-input distributed power systems requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for MP4562GJ-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 core expertise in DC/DC converters, LED drivers, and motor drivers for industrial, computing, and automotive markets.

The MP4562 belongs to MPS's high-voltage buck converter product line, designed specifically for compact, efficient, and robust power conversion in 24–60V industrial and communications infrastructure where reliability under fault conditions is essential.

FAQ

What is the maximum recommended output current for MP4562GJ-P at 60°C ambient temperature?

The MP4562GJ-P delivers 2A continuous output current at T_A = 25°C with proper PCB copper area (2-layer, 1oz). At 60°C ambient, thermal derating applies: with θ_JA = 100°C/W and T_J(MAX) = 150°C, maximum allowable power dissipation is 9W, supporting ≥1.8A at typical 12V→5V conversion before thermal shutdown activates.

Can MP4562GJ-P operate with an input voltage below 4.5V?

No. The MP4562GJ-P has a guaranteed UVLO rising threshold of 4.2V and will not start switching until VIN exceeds this level. Operation below 4.5V violates the Recommended Operating Conditions and may result in unstable regulation or failure to enable. For sub-4.5V inputs, consider MPS's MPQ4572 or similar lower-VIN alternatives.

How does the frequency foldback function protect the device during short-circuit conditions?

During short-circuit, FB voltage collapses to near 0V, triggering frequency foldback: f_SW drops to ~1/10 of its nominal value (e.g., 50kHz from 500kHz) and ILIMIT folds back to ~1.8A. This reduces switching losses and junction temperature rise, preventing thermal runaway while maintaining detectable switching for fault recovery.

Is the MP4562GJ-P pin-compatible with earlier MP4560 or MP4561 variants?

No. MP4562GJ-P uses TSOT23-8 with distinct pinout (SS/GND/FREQ/FB/EN/VIN/SW/BST). MP4560 and MP4561 are in different packages (e.g., SOIC-8 or MSOP-8) with incompatible pin assignments and functional differences including lack of frequency foldback and higher R_DS(ON). Direct replacement requires PCB redesign and validation.

What is the minimum off-time specification, and why does it matter for high-duty-cycle operation?

The MP4562GJ-P specifies t_OFF(MIN) = 100ns. During high-duty-cycle operation (e.g., V_OUT/V_IN > 90%), this minimum off-time prevents the controller from losing regulation by forcing a minimum dead time. If t_OFF(MIN) were violated, the HS-FET could remain continuously on, causing overcurrent and thermal failure.

Does MP4562GJ-P support forced PWM mode, or does it automatically enter power-save mode at light load?

MP4562GJ-P operates exclusively in peak current mode with automatic frequency stretch-down at light load - it does not support forced PWM or skip-cycle modes. As load decreases, f_SW gradually reduces to minimize switching losses, reaching near-zero frequency before entering micropower sleep mode, ensuring ultra-low IQ without audible noise or output ripple artifacts.