Monolithic Power Systems Inc. MP8762HGLE-Z

Overview

MP8762HGLE-Z from Monolithic Power Systems is a fully integrated synchronous step-down DC/DC converter delivering 10A output current with 2.5V–18V input range, 0.611V–13V adjustable output, and proprietary adaptive Constant-On-Time (COT) control for ultrafast transient response in compact QFN-16 (3mm×4mm) package. It integrates high- and low-side MOSFETs with R_DS(ON) of 26mΩ (HS) and 16mΩ (LS), supports programmable 200kHz–1MHz switching frequency, and targets high-density power rails in set-top boxes and small-cell base stations.

For engineers reviewing the MP8762HGLE-Z datasheet, MP8762HGLE-Z pinout, MP8762HGLE-Z application, or MP8762HGLE-Z equivalent, key selection criteria include its non-latch OCP/OVP protection, pre-bias startup capability, 1.5% reference voltage accuracy over –40°C to +125°C, open-drain power-good signaling with 2.5ms delay, and thermal shutdown at 150°C with 25°C hysteresis.

Technical Context

The MP8762HGLE-Z employs adaptive COT control with feed-forward compensation, enabling near-constant switching frequency across input voltage variation while maintaining fast load-step response without external loop compensation. Its internal 4.8V VCC LDO powers gate drivers and control circuitry, with UVLO threshold programmable via EN pin resistor network.

Operation spans CCM and DCM modes: in CCM, fixed on-time PWM regulates output with dead-time controlled shoot-through prevention; in DCM, current modulation limits negative inductor current to –2.5A, enabling skip-mode operation and high light-load efficiency. Soft-start is externally capacitor-programmable, and PG signal asserts after FB reaches 91% V_REF with 2.5ms delay.

Key Specifications

Pinout & Package

MP8762HGLE-Z is housed in a thermally enhanced QFN-16 package (3mm × 4mm, 0.5mm pitch) with exposed thermal pad. The package supports high-power dissipation (θ_JA = 46°C/W on 4-layer PCB) and requires solder paste stencil optimization for thermal pad reliability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with RTQ2132BGQW and TPS546B24RVFR, MP8762HGLE-Z offers superior transient response via adaptive COT, smaller footprint (3×4mm vs. 5×6mm), and simpler layout due to no external compensation - making it optimal for space-constrained, high-dynamic-load applications where digital control adds unnecessary overhead.

Availability

MP8762HGLE-Z is available at Aetrix Electronics and suitable for set-top box power rails, XDSL modem core supplies, and flat-panel display logic rails requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP8762HGLE-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 over two decades of expertise in DC/DC conversion, motor drivers, and LED lighting controllers.

The MP8762H belongs to MPS's high-current monolithic buck converter product line, designed specifically for compact, high-efficiency point-of-load regulation in consumer, telecom, and industrial equipment where thermal density and transient response are critical.

FAQ

What is the minimum recommended input voltage when using internal VCC bias?

The MP8762HGLE-Z requires a minimum 4.5V input when operating with internal VCC bias, as the internal 4.8V LDO needs sufficient headroom. Below 4.5V, the VCC regulator cannot maintain stable output, causing erratic gate drive and potential shutdown. External 5V bias enables operation down to 2.5V input.

How does the pre-bias startup function prevent reverse current flow?

During pre-bias startup, the MP8762HGLE-Z disables both high-side and low-side MOSFETs until the soft-start capacitor voltage exceeds the sensed FB voltage. This prevents the low-side FET from turning on and sinking current from a pre-charged output, avoiding destructive reverse conduction through the body diode or external catch diode.

Can the MP8762HGLE-Z operate without an external bootstrap capacitor?

No. A bootstrap capacitor between BST and SW pins is mandatory to generate the floating gate-drive voltage for the high-side MOSFET. Omitting it causes immediate failure of HS-FET turn-on, resulting in no output regulation and potential thermal damage due to uncontrolled LS-FET conduction.

What is the maximum allowable resistance on the FREQ pin for 200kHz operation?

For 200kHz switching frequency, the FREQ-to-IN resistor must be approximately 1.1MΩ, calculated per the datasheet equation. Exceeding this value risks instability due to insufficient feed-forward gain, while lower values increase switching frequency beyond 1MHz and may degrade efficiency at light loads.

Is the power-good (PG) signal active-high or active-low by default?

The PG pin is open-drain and defaults to active-low: it sinks current and pulls low until FB reaches 91% of V_REF, then releases to float high after a 2.5ms delay when pulled up externally (e.g., to VCC via 100kΩ). It reasserts low on OVP, UVP, or thermal fault.

Does the MP8762HGLE-Z support forced continuous conduction mode (FCCM)?

No. The MP8762HGLE-Z operates in automatic CCM/DCM transition mode only. It lacks a MODE pin or register setting to force CCM at light loads. In DCM, it uses skip-mode and current modulation to improve light-load efficiency, which is intentional for its target applications.

What is the thermal pad soldering requirement for QFN-16 package reliability?

The exposed thermal pad must be soldered to a minimum 12mm² copper pour with ≥4 thermal vias (0.3mm diameter, filled or capped) connecting to inner ground planes. Insufficient thermal pad soldering causes junction temperature rise >15°C, triggering premature thermal shutdown under 10A load.