Monolithic Power Systems Inc. MP8726EL-LF-Z

Overview

MP8726EL-LF-Z from Monolithic Power Systems is a synchronous step-down DC/DC converter IC with integrated 120mΩ high-side and 20mΩ low-side MOSFETs, delivering up to 6A peak output current across a 4.5V–21V input range, fixed 500kHz switching frequency, and adjustable 0.8V output voltage - deployed in notebook I/O power rails and flat-panel display power supplies.

For engineers reviewing the MP8726EL-LF-Z datasheet, MP8726EL-LF-Z pinout, MP8726EL-LF-Z application, or MP8726EL-LF-Z equivalent, this device requires attention to BST capacitor selection, EN/SYNC logic thresholds (1.1–1.6V rising), PG open-drain behavior (0.7–0.9×VFB thresholds), and thermal derating above 85°C ambient.

Technical Context

The MP8726 operates in peak-current-mode control with internal compensation, enabling stable regulation without external loop components. Its proprietary switching loss reduction technique and bootstrap-driven high-side gate driver support >85% duty cycle operation at high VIN/VOUT ratios.

It integrates a 5V internal VCC regulator powered from VIN, a fold-back frequency comparator activated below 0.5V on FB, and latch-off overcurrent protection triggered when FB drops below 30% of regulation - ensuring robust short-circuit recovery in distributed power systems.

Key Specifications

Pinout & Package

MP8726EL-LF-Z is housed in a thermally enhanced 3mm × 4mm, 14-pin QFN package with exposed thermal pad (connected to AGND per layout guidelines). The package supports high-power density designs with θJA = 48°C/W on standard 4-layer PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP8726EL-LF-Z, MP2315GJ-Z trades peak current and feature set for size/cost, while RT7276BGQW extends input range but adds external bias complexity - making MP8726 optimal for 12–21V, 6A, space-constrained consumer power rails requiring PG and SYNC.

Availability

MP8726EL-LF-Z is available at Aetrix Electronics and suitable for notebook I/O power, flat-panel display bias, and distributed networking power applications requiring stable component supply, RoHS-compliant packaging, and long-term lifecycle continuity.

Supply support for MP8726EL-LF-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, headquartered in California and serving global industrial, computing, and consumer markets since 1997.

The MP8726 belongs to MPS's high-current synchronous buck converter product line, designed specifically for compact, high-efficiency point-of-load regulation in space- and thermal-constrained portable and display electronics.

FAQ

What is the minimum recommended output capacitance for MP8726EL-LF-Z at 1.2V/6A?

The datasheet specifies ≥47µF ceramic output capacitance for 1.2V operation, using X5R/X7R dielectrics with low ESR. This value ensures stability under full load and limits output ripple to <20mV peak-to-peak. Lower capacitance may cause instability or excessive ripple, especially with high ESR or temperature drift.

Can MP8726EL-LF-Z operate with an input voltage below 4.5V?

No - the absolute minimum operating input is 4.5V per the Recommended Operating Conditions table. Below this, UVLO prevents startup, and the internal VCC regulator cannot sustain 5V bias. Attempting operation at 4.0V will result in intermittent enable/disable cycling or complete shutdown.

How does the EN/SYNC pin behave when used for external clock synchronization?

When an external clock (300kHz–2MHz) is applied to EN/SYNC, the internal oscillator locks to its rising edge within 2ms. The chip maintains soft-start timing and PG assertion relative to the synchronized clock - enabling deterministic multi-rail phase alignment without additional timing ICs.

Is the exposed thermal pad electrically connected internally?

No - the exposed pad is NC (no internal connection), as confirmed in the Pin Functions table. It must be soldered to a grounded PCB copper plane solely for thermal conduction; connecting it to any other net risks shorting internal AGND/GND isolation or degrading PG accuracy.

What happens during thermal shutdown, and how does recovery work?

At 150°C junction temperature, the device shuts down all switching and pulls PG low. Recovery occurs only after die temperature falls to ~140°C, at which point the IC reinitiates soft-start. This hysteresis prevents thermal oscillation and ensures safe cooldown before restart.

Why does MP8726EL-LF-Z require separate AGND and GND pins?

AGND serves as the quiet reference for the error amplifier and FB comparator, while GND carries high di/dt switch currents. Separating them prevents ground bounce from corrupting feedback sensing - a critical layout requirement verified in the block diagram and PCB guidelines to maintain <1% output regulation accuracy.

Does the MP8726EL-LF-Z support forced PWM mode at light load?

No - the device operates exclusively in peak-current-mode with automatic pulse-skipping at light loads. There is no external pin or register to force continuous conduction mode; efficiency optimization relies on natural valley-switching behavior below ~100mA output current.