Monolithic Power Systems Inc. MP8794GLE-P

Overview

MP8794GLE-P from Monolithic Power Systems is a fully integrated, high-frequency synchronous step-down converter delivering up to 20A output current with 0.6V–5.5V adjustable output voltage, 600–1000kHz configurable switching frequency, and differential remote sensing for precision regulation in FPGA and optical module power rails.

For engineers reviewing the MP8794GLE-P datasheet, MP8794GLE-P pinout, MP8794GLE-P application, or MP8794GLE-P equivalent, key selection criteria include its adaptive constant-on-time (COT) control for ultra-fast transient response, programmable soft-start (1ms minimum), PGOOD active-clamp behavior during input failure, and non-latch OCP/OVP/UVP/OTP protection architecture.

Technical Context

The MP8794GLE-P implements an internally compensated adaptive COT control scheme that eliminates external loop compensation while maintaining stability across 0.6V–5.5V output voltages and 4V–16V input range. Its valley-current sensing via CS pin enables cycle-by-cycle over-current protection with configurable trip threshold (1.15–1.25V).

It supports dual operating modes-forced CCM and pulse-skip-selected via MODE pin resistor configuration, enabling optimized efficiency across 0–20A load range. Differential remote sense (FB/VSNS-) provides ±0.5% load regulation accuracy independent of PCB trace resistance.

Key Specifications

Pinout & Package

MP8794GLE-P is housed in a thermally enhanced QFN-21 (3mm × 4mm) package with wettable flanks and 0.4mm pitch, optimized for high-current PCB layouts with multiple PGND pads and dedicated power/ground separation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with RTQ2132BGQW and TPS546B24A, MP8794GLE-P uniquely balances analog configurability (tracking, soft-start, frequency selection), compact 3mm×4mm footprint, and robust protection-making it optimal for space-constrained, analog-controlled systems where digital overhead is undesirable.

Availability

MP8794GLE-P is available at Aetrix Electronics and suitable for FPGA core supplies, optical module bias rails, multi-function printer engine control, and enterprise Wi-Fi 6 access point SoC power delivery requiring stable component supply across extended production cycles.

Supply support for MP8794GLE-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 over two decades of expertise in DC/DC conversion, motor drivers, and LED lighting controllers.

The MP8794 belongs to MPS's high-current synchronous buck converter product line, designed specifically for demanding point-of-load applications in computing, networking, and optical infrastructure where efficiency, thermal performance, and transient response are critical.

FAQ

What is the minimum recommended output capacitance for MP8794GLE-P?

The MP8794GLE-P is stable with zero-ESR ceramic capacitors; typical designs use six 47µF X7R MLCCs (total 282µF) in parallel. This configuration meets ripple requirements (<10mV_pp) and ensures stability across all operating conditions without requiring bulk electrolytic or polymer capacitors.

How does the REF/TRK pin function during power-up and tracking modes?

During power-up, REF/TRK sets soft-start time via external capacitor; once V_REF/TRK ≥ 600mV, regulation begins. In tracking mode, REF/TRK accepts 0.3–1.4V analog input, and FB follows this voltage scaled by the feedback divider ratio-overriding internal soft-start and enabling synchronized rail sequencing.

Can MP8794GLE-P operate with only external 3.3V VCC bias and no internal LDO activation?

Yes-when an external 3.3V supply is applied to VCC, the internal 3V LDO is disabled. The device operates across 2.7V–16V VIN range in this mode, enabling use with low-input systems like 3.3V intermediate buses, provided VCC remains within 3.12–3.6V.

What is the purpose of the negative inductor current limit and how is it enforced?

The MP8794GLE-P limits negative inductor current to –18A using valley-current detection during light-load discontinuous conduction. When exceeded, the LS-FET turns off for 200ns to prevent reverse conduction, protecting MOSFETs and maintaining control loop integrity during fast load release events.

Does MP8794GLE-P support output voltage margining or dynamic adjustment after startup?

No-output voltage is set statically by the FB resistor divider and cannot be adjusted dynamically post-startup. However, REF/TRK enables analog tracking of another supply, allowing coordinated ramp-up/down of multiple rails without digital interface.

How is PGOOD behavior affected when VIN drops below UVLO threshold?

When VIN falls below 1.55–2.15V (UVLO falling threshold), internal circuitry disables regulation and clamps PGOOD to ~0.7V regardless of external pull-up voltage-providing unambiguous system-level power-failure indication even if VCC is externally powered.

What layout guidance is critical for achieving rated 20A performance?

Use ≥6oz copper on VIN, SW, and PGND layers; place 8× PGND pins directly under the QFN body with thermal vias to inner ground planes; route FB/VSNS− traces as matched-length differential pair away from noisy SW node; and place BST capacitor <1mm from BST/SW pins with short, wide traces.