Monolithic Power Systems Inc. MP92265GJ-P

Overview

MP92265GJ-P from Monolithic Power Systems is a synchronous step-down DC/DC converter IC with integrated 47mΩ/18mΩ MOSFETs, delivering up to 5A output current across 6–18V 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 minimal external components are critical.

For engineers reviewing the MP92265GJ-P datasheet, MP92265GJ-P pinout, MP92265GJ-P application, or MP92265GJ-P equivalent, key selection criteria include its TSOT23-8 footprint, AAM programmable light-load mode, hiccup-mode OCP, 1% reference accuracy at 25°C, and bootstrap-driven high-side gate drive requiring external BST capacitor.

Technical Context

The MP92265GJ-P employs peak-current-mode control with an internal 500kHz oscillator and cycle-by-cycle over-current protection. Its error amplifier compares FB against a 600mV ±1% internal reference and drives COMP to regulate duty cycle via the high-side MOSFET.

Advanced Asynchronous Mode (AAM) enables programmable PFM operation under light loads using an external resistor divider on the AAM pin; soft-start timing is set by an external capacitor on SS, while BST supplies the floating gate driver for the high-side switch through a SW–BST capacitor.

Key Specifications

Pinout & Package

MP92265GJ-P is housed in an 8-pin TSOT23 package (3.0mm × 3.0mm × 0.9mm), optimized for high-density PCB layouts with exposed thermal pad (pin 4 GND). The package supports reflow soldering per JEDEC MO-193BA and requires controlled thermal relief for GND and IN traces.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP92265GJ-P, MP1655GQ-Z trades current capability and AAM flexibility for higher frequency and smaller size, while MP1499GQ-Z extends current and thermal capability in a larger but more robust package-neither matches the exact 5A/TSOT23-8/AAM combination of the MP92265GJ-P.

Availability

MP92265GJ-P is available at Aetrix Electronics and suitable for flat-panel display power, notebook I/O rail, digital set-top box SoC core, and distributed telecom power applications requiring stable component supply and legacy design continuity.

Supply support for MP92265GJ-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 analog and power ICs, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MP92265 belongs to MPS's high-efficiency synchronous buck converter product line, engineered for space-constrained, thermally sensitive applications such as consumer displays and portable computing where integration, efficiency, and small-footprint packaging are primary design drivers.

FAQ

What is the recommended input capacitor for MP92265GJ-P?

A minimum 22μF X5R/X7R ceramic capacitor rated for ≥25V is required at the IN pin, placed as close as possible to pins 2 (IN) and 4 (GND). An additional 0.1μF ceramic capacitor should be added in parallel for high-frequency decoupling. Total RMS current rating must exceed 2.5A, calculated per Equation (6) in the datasheet.

Can MP92265GJ-P operate with a 5V input?

No. The absolute minimum input voltage is 6V due to internal UVLO threshold of 4.8V (rising) and 3.8V (falling); operation below 6V risks unstable startup or shutdown. For 5V input applications, consider MP1499GQ-Z or MP2451DT-LF-Z which support 4.5V min input.

How is soft-start time calculated for MP92265GJ-P?

Soft-start time (ms) = (C_SS in nF × 0.6V) ÷ 11μA. For example, a 100nF capacitor yields ~5.45ms ramp time. The internal 11μA current source charges C_SS until voltage reaches 0.6V, at which point regulation begins; C_SS must be ceramic with ≤10% tolerance.

Does MP92265GJ-P require an external bootstrap diode?

An external bootstrap diode (e.g., 1N4148) is optional but recommended when VIN − VOUT < 2.6V or duty cycle exceeds 75%, such as in 12V-to-1V conversion. It improves BST voltage stability during light-load PFM operation and reduces output ripple caused by insufficient bootstrap refresh.

What is the function of the AAM pin in practical layout?

The AAM pin accepts a resistor divider from VCC to GND to set the COMP voltage threshold for entering PFM mode. A typical divider uses 100kΩ (R3) and 7.5kΩ (R4) for 3.3V output, placing AAM at ~0.63V. Layout requires short, noise-immune routing away from SW and inductors to avoid false triggering.

Is MP92265GJ-P RoHS and halogen-free compliant?

Yes. MP92265GJ-P is lead-free, halogen-free, and fully compliant with EU RoHS Directive 2011/65/EU and China RoHS. MPS confirms green status on its official Quality Assurance page, and all TSOT23-8 packages meet JEDEC J-STD-020 moisture sensitivity level MSL3.

Why is MP92265GJ-P marked "Not Recommended for New Designs"?

MPS has superseded MP92265GJ-P with MP1655 and MP1499 to address thermal limitations in TSOT23-8 at 5A and add features like integrated BOOT diodes and higher current ratings. While MP92265GJ-P remains functional and supported for existing designs, new projects should evaluate MP1499GQ-Z for direct 5A+ replacement or MP1655GQ-Z for higher-frequency, lower-current alternatives.