Monolithic Power Systems Inc. MP92265GJ-Z

Overview

MP92265GJ-Z from Monolithic Power Systems is a synchronous step-down DC/DC converter with integrated 47mΩ/18mΩ MOSFETs, delivering up to 5A output current across 6V–18V input, fixed 500kHz switching frequency, and adjustable 0.6V–VIN×0.95 output voltage. It targets compact I/O power rails in notebook systems and flat-panel displays where thermal efficiency and board space are critical.

For engineers reviewing the MP92265GJ-Z datasheet, MP92265GJ-Z pinout, MP92265GJ-Z application, or MP92265GJ-Z equivalent, key selection considerations include its TSOT23-8 package footprint, AAM programmable light-load mode, hiccup-mode OCP behavior, and explicit "Not Recommended for New Designs" status requiring migration planning to MP1655 or MP1499.

Technical Context

The MP92265GJ-Z employs peak-current-mode control with internal 0.6V reference and optimized compensation, enabling stable regulation without external loop components. Its advanced asynchronous mode (AAM) uses an external resistor divider on the AAM pin to set the transition threshold between CCM and PFM operation, directly modulating switching frequency under light load.

Bootstrap gate drive supports high-side MOSFET operation with internal UVLO (2.6V rising, 350mV hysteresis) on BST, while cycle-by-cycle over-current protection triggers hiccup mode when FB drops below 30% of VREF-ensuring safe short-circuit recovery without latch-off.

Key Specifications

Pinout & Package

MP92265GJ-Z is housed in a thermally enhanced 8-pin TSOT23 package (JEDEC MO-193BA), with exposed pad for improved heat dissipation. Pin 1 is bottom-left when reading top marking left-to-right.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP92265GJ-Z, MP1655GQ-Z offers higher input voltage margin and superior thermal handling in QFN, while MP1499GQ-Z retains the TSOT23-8 footprint but removes AAM configurability-making it simpler but less adaptable to variable load profiles.

Availability

MP92265GJ-Z is available at Aetrix Electronics and suitable for flat-panel display power, notebook I/O rail, digital set-top box SoC core, and distributed point-of-load supply applications requiring stable component supply despite its "Not Recommended for New Designs" status.

Supply support for MP92265GJ-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 MP92265 belongs to MPS's high-density synchronous buck converter product line, engineered for space-constrained, thermally sensitive applications such as consumer electronics and portable computing where integration, efficiency, and small footprint are primary design goals.

FAQ

Is MP92265GJ-Z still in active production?

Yes, MP92265GJ-Z remains in active production and available for purchase, though Monolithic Power Systems explicitly labels it "Not Recommended for New Designs" due to newer alternatives like MP1655 and MP1499 offering improved specs and support. Lifecycle notifications are tracked and communicated proactively to Aetrix customers.

What is the purpose of the AAM pin, and how is it configured?

The AAM (Advanced Asynchronous Mode) pin sets the load threshold for automatic transition between continuous conduction mode (CCM) and pulse-frequency modulation (PFM). It is configured using two external resistors forming a divider from VCC to GND; the tap voltage determines the COMP threshold at which PFM begins, enabling programmable light-load efficiency optimization.

Can MP92265GJ-Z operate with a 5V input?

No-MP92265GJ-Z has a minimum input voltage of 6V per absolute maximum ratings and recommended operating conditions. Attempting 5V operation will trigger under-voltage lockout (UVLO), preventing startup. For 5V-input applications, consider MP1499 (6V–18V) or MP2451 (3.3V–36V) as functional alternatives.

Why does the datasheet specify a 0.1µF capacitor on both BST and VCC pins?

The 0.1µF ceramic capacitor on BST forms the floating supply for the high-side gate driver, ensuring reliable turn-on under all duty cycles. The VCC capacitor stabilizes the internal 5V bias regulator, suppressing noise that could disrupt error amplifier operation or soft-start timing-both are critical for startup reliability and output accuracy.

Does MP92265GJ-Z support output voltages below 0.6V?

No-the internal reference is fixed at 0.6V, and the feedback architecture requires V_FB = 0.6V × (1 + R1/R2); therefore, the lowest achievable output is 0.6V (when R2 → ∞). For sub-0.6V outputs, an external reference or different topology (e.g., LDO post-regulator) is required.

How does hiccup-mode over-current protection behave during a sustained short circuit?

When FB voltage drops below 30% of the 0.6V reference (i.e., <180mV) for sufficient duration, MP92265GJ-Z enters hiccup mode: it disables switching, waits ~30ms, attempts restart, and repeats. This limits average short-circuit current to ~1.5A, preventing thermal runaway while allowing automatic recovery once the fault clears-no manual reset needed.

What is the maximum allowable output capacitance for stable operation?

MP92265GJ-Z supports a wide range of output capacitance values (22µF–470µF) and ESR (0.5mΩ–50mΩ), thanks to its internally compensated error amplifier. Stability is maintained with ceramic, tantalum, or polymer capacitors; however, exceeding 470µF may delay soft-start completion and increase inrush stress on input components.