Monolithic Power Systems Inc. MP8795HGLE-Z

Overview

MP8795HGLE-Z from Monolithic Power Systems is a fully integrated, high-frequency synchronous buck converter delivering up to 20A output current with adjustable current limit, programmable switching frequency (600/800/1000 kHz), and voltage tracking capability. It operates from 4V–16V input, regulates output from 0.6V to 5.5V, and features differential remote sensing, adaptive constant-on-time (COT) control, and full protection suite (OCP/OVP/UVP/OTP). It is used in FPGA power rails requiring fast transient response and tight regulation.

For engineers reviewing the MP8795HGLE-Z datasheet, MP8795HGLE-Z pinout, MP8795HGLE-Z application, or MP8795HGLE-Z equivalent, key selection criteria include its QFN-21 (3mm×4mm) package, 20A continuous output, programmable soft-start via REF/TRK capacitor, PGOOD open-drain timing behavior, and MODE-pin selectable fixed-frequency operation under varying VIN/VOUT conditions.

Technical Context

The MP8795HGLE-Z implements an internally compensated adaptive constant-on-time (COT) control architecture that eliminates external loop compensation while enabling ultrafast load transient response-critical for FPGA core voltage rails. Its valley-current sensing via CS pin enables cycle-by-cycle positive over-current protection with non-latch hiccup recovery, and negative inductor current limiting at –18A prevents reverse conduction during light-load CCM operation.

Differential remote sensing (FB/VSNS–) ensures accurate regulation at the load point despite PCB IR drop, while the REF/TRK pin supports analog voltage tracking from another supply or external reference (0.3–1.4V range). The PGOOD signal provides precise power-good indication with 0.9ms delay after FB reaches 92.5% of VREF and clamps low during input failure-even with external pull-up.

Key Specifications

Pinout & Package

MP8795HGLE-Z is housed in a thermally enhanced QFN-21 package (3mm × 4mm, 0.5mm pitch) with exposed thermal pad (Pin 21) and seven PGND pins (Pins 11–18) for low-impedance return path and improved thermal dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with RTQ2132BGQW and TPS546D24RSAR, MP8795HGLE-Z offers unique analog voltage tracking, adaptive COT for zero-compensation design, and seamless pre-bias start-up-making it optimal for space-constrained, analog-sequenced FPGA and optical module applications where digital control adds unnecessary overhead.

Availability

MP8795HGLE-Z is available at Aetrix Electronics and suitable for FPGA core power, optical module bias, multi-function printer engine, and Wi-Fi 6 access point SoC applications requiring stable component supply, consistent parametric performance, and long-term industrial lifecycle support.

Supply support for MP8795HGLE-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 focus on integration, efficiency, and thermal robustness.

The MP8795H product line targets high-current, space-constrained POL applications in computing, networking, and optical infrastructure-designed to replace multi-chip solutions with single-package 20A buck converters featuring advanced protection and analog flexibility.

FAQ

What is the minimum recommended input capacitance for MP8795HGLE-Z at 20A output?

The datasheet recommends using ceramic input capacitors with RMS current rating exceeding half the maximum load current (≥10A RMS). For 20A operation, a minimum of three 22 µF/25V X5R/X7R MLCCs placed close to VIN pins meets ripple current and impedance requirements while maintaining <10 mV input ripple at 12V input.

Can MP8795HGLE-Z operate with only ceramic output capacitors?

Yes-its adaptive COT control with internal RAMP compensation ensures stability with zero-ESR ceramic capacitors alone. No bulk electrolytic or polymer capacitor is required, simplifying layout and improving reliability in high-temperature environments.

How does the MODE pin select switching frequency, and what resistor values are required?

MODE pin selects frequency by connecting a resistor to AGND: 0Ω (GND) = 600 kHz, 30.1 kΩ ±20% = 800 kHz, 60.4 kΩ ±20% = 1000 kHz. Resistor tolerance directly impacts fSW accuracy-use 1% metal-film resistors for ±5% frequency control.

What happens to PGOOD during input supply failure?

When VIN drops below UVLO threshold (~2.4V), PGOOD is actively clamped to ~0.7V regardless of external pull-up voltage-providing unambiguous fault signaling to system controllers without requiring additional supervision circuitry.

Is remote sensing mandatory, and how should VSNS– be connected if unused?

Remote sensing is optional. If unused, VSNS– must be shorted directly to AGND at the IC pin-not at the output capacitor-to avoid feedback loop instability. Leaving VSNS– floating will cause regulation failure and potential OVP trips.

Does MP8795HGLE-Z support forced continuous conduction mode (FCCM) across full load range?

Yes-it operates exclusively in forced CCM from 0A to 20A, eliminating mode transitions and associated audible noise or output voltage discontinuities. This ensures consistent EMI signature and predictable inductor current waveform for EMI filter design.

What is the maximum allowable voltage on the REF/TRK pin during tracking operation?

The REF/TRK pin accepts 0.3V–1.4V during tracking mode. Exceeding 1.4V risks damaging the internal amplifier; applying >1.4V requires external clamping. During soft-start, REF/TRK must reach ≥600 mV before regulation begins to ensure proper startup sequencing.