Monolithic Power Systems Inc. MP8620DQK-LF-Z

Overview

MP8620DQK-LF-Z from Monolithic Power Systems is a fully integrated synchronous buck converter IC with internal 3mΩ/12mΩ MOSFETs, delivering 25A continuous output current across 6V–16V input range and supporting 0.8V–(V_CC−1.5V) adjustable output voltage. It employs average current mode control, features cycle-by-cycle OCP, thermal shutdown, OVP/UVP, and PG signaling, and is deployed in FPGA/ASIC point-of-load regulation and DDR memory power supplies.

For engineers reviewing the MP8620DQK-LF-Z datasheet, MP8620DQK-LF-Z pinout, MP8620DQK-LF-Z application, or MP8620DQK-LF-Z equivalent, key selection criteria include its 6×6mm QFN package, 600kHz default switching frequency (300kHz–1.5MHz programmable), ±1.0% FB voltage accuracy, multi-phase synchronization capability, and DCR-based current sensing architecture.

Technical Context

The MP8620DQK-LF-Z implements average current mode control with an internal error amplifier (gain = 1.2mA/V), slope compensation (1.1V), and dual-stage current sensing (30V/V gain). Its PWM logic integrates a 50ns minimum on-time, 90% maximum duty cycle, and COMP pin-based Type II/III loop compensation for stable transient response.

It supports multi-phase operation via SYNCIN/SYNCOUT with programmable phase shifts (90°/120°/180°) determined by PD pin voltage, and enables precise power sequencing through EN-controlled soft-start (4μA charge current), startup tracking, and open-drain PG with 500μs rise/fall delays.

Key Specifications

Pinout & Package

MP8620DQK-LF-Z is housed in a thermally enhanced 6×6mm QFN-36 package with exposed thermal pad (pins 3, 4, 5, 22, 23, and 6–21 all tied to GND or IN/SW internally per datasheet top view).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck regulator applications.

Compared with RTQ2962GSP-QA and TPS546B24A, the MP8620DQK-LF-Z provides optimal analog multi-phase synchronization and DCR sensing for cost-sensitive, high-density FPGA/ASIC power without digital interface complexity or over-spec'd current rating.

Availability

MP8620DQK-LF-Z is available at Aetrix Electronics and suitable for FPGA core power, DDR memory regulation, networking ASIC pre-regulation, and data center distributed power systems requiring stable component supply and long-term industrial availability.

Supply support for MP8620DQK-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, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MP8620 belongs to MPS's fully integrated DC/DC converter product line, engineered for high-current, space-constrained point-of-load applications in computing, networking, and data center infrastructure.

FAQ

What is the recommended input capacitor configuration for MP8620DQK-LF-Z?

Use parallel X5R/X7R ceramic capacitors totaling ≥47μF near the IN pins, with RMS current rating exceeding half the 25A load current (≥12.5A RMS). Place them within 3mm of pins 3/4/5/22/23 with multiple vias to the exposed thermal pad for lowest impedance and thermal resistance.

How does the MP8620DQK-LF-Z achieve current sensing without a shunt resistor?

It uses lossless DCR sensing: the SENP/SENN differential inputs measure voltage across an RC network matching the inductor's DCR time constant. With ACS = 30V/V gain and 18.5mV current limit threshold, it achieves accurate peak current detection without shunt power loss or board area penalty.

Can MP8620DQK-LF-Z operate in single-phase mode without synchronization?

Yes - leaving SYNCIN open or tying it to AGND disables external sync and defaults to internal 600kHz oscillator. The device functions as a standalone 25A buck regulator with full protection and soft-start; SYNCOUT remains inactive unless configured as master in multi-phase setup.

What thermal derating applies above 85°C ambient temperature?

With θ_JA = 30°C/W, junction temperature rises ~750°C per watt at TA = 85°C. At 25A/1.2V output (30W dissipation), T_J exceeds 150°C limit well before TA = 85°C. Derate output current to ≤18A at 85°C ambient using forced airflow or enhanced heatsinking per Figure 8 thermal curves.

Is the MP8620DQK-LF-Z RoHS compliant and lead-free?

Yes - the "-LF" suffix denotes lead-free, RoHS-compliant packaging. The device meets JEDEC J-STD-020 moisture sensitivity level 3 (MSL3) and is qualified for reflow soldering per IPC/JEDEC J-STD-020D. Full compliance documentation is available from MPS upon request.

How is output voltage adjusted, and what resistor tolerance is required?

Output voltage is set by an external resistor divider from VOUT to GND, with FB connected to the midpoint. For ±1.0% FB accuracy, use 1% tolerance resistors (e.g., R1 = 40.2kΩ, R2 = 32.4kΩ for 1.8V). Layout must minimize noise coupling to FB and keep traces short and shielded.

Does MP8620DQK-LF-Z support power sequencing with other regulators?

Yes - EN and PG pins enable hardware-based sequencing: PG from a prior rail can drive EN of MP8620DQK-LF-Z, while its own PG signals downstream devices. SS pin further allows ratiometric or simultaneous voltage tracking with external rails via resistor networks.