Monolithic Power Systems Inc. MP20073DH-LF-Z

Overview

MP20073DH-LF-Z from Monolithic Power Systems is a 2A sink/source DDR memory termination regulator with integrated VTT and buffered VTTREF outputs, designed for DDR2/DDR3 systems requiring precise VDDQ/2 tracking (±30mV), Kelvin sensing (VTTSEN), and fast transient response using only 20µF ceramic output capacitance. It operates from 1.3V–6.0V VDDQ input and supports ACPI-compliant notebook memory supplies.

For engineers reviewing the MP20073DH-LF-Z datasheet, MP20073DH-LF-Z pinout, MP20073DH-LF-Z application, or MP20073DH-LF-Z equivalent, key selection criteria include VTT accuracy under load (±30mV at 2A), thermal shutdown threshold (150°C), VDRV bias voltage requirement (3.3V), and MSOP-8E exposed-pad package thermal resistance (θJA = 80°C/W).

Technical Context

The MP20073DH-LF-Z implements a linear LDO architecture with dual regulation paths: one for VTT (2A sink/source) and another for VTTREF (buffered VREF/2). Its control logic is powered by VDRV (3.3V), enabling independent startup sequencing from VDDQ UVLO detection (0.9V–1.3V threshold).

Kelvin sensing via VTTSEN ensures accurate remote VTT regulation at the DDR memory termination point, while internal soft-start limits inrush current to ≤1.0A during power-up. Overcurrent protection activates at 3.0A (sink/source), derating to 1.0A if VTT drops below one-third of target voltage.

Key Specifications

Pinout & Package

The MP20073DH-LF-Z is housed in an 8-pin MSOP with exposed thermal pad (MSOP8E), optimized for thermal performance in space-constrained DDR memory subsystems. The exposed pad must be soldered to PCB ground plane using ≥10 vias (0.3mm drill) for θJC = 12°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar DDR memory termination regulator applications.

Compared with TPS51200DRCR and RT8202MZQW, the MP20073DH-LF-Z delivers tighter VTT/VTTREF accuracy (±30mV/±15mV), integrated Kelvin sensing, and lower output capacitance requirement (20µF), making it optimal for space-constrained DDR2/DDR3 notebooks demanding JEDEC-compliant termination stability.

Availability

MP20073DH-LF-Z is available at Aetrix Electronics and suitable for notebook DDR2/DDR3 memory termination, ACPI-compliant memory subsystems, and space-constrained DDR3 interface designs requiring stable component supply and long-term lifecycle support.

Supply support for MP20073DH-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 core expertise in DC/DC conversion, LED drivers, and memory interface power solutions.

The MP20073 belongs to MPS's DDR memory power management product line, engineered specifically for low-cost, high-density DDR2/DDR3 termination with minimal external components and robust thermal performance in portable computing platforms.

FAQ

What is the minimum VDDQ voltage required to enable the MP20073DH-LF-Z?

The MP20073DH-LF-Z features VDDQ undervoltage lockout (UVLO) with an upper threshold of 0.9V (rising edge) and hysteresis of 55mV. Operation begins only when VDDQ exceeds 0.9V and the EN pin is high. Below this threshold, the VTT regulator shuts down to prevent unstable termination.

Can the MP20073DH-LF-Z operate with DDR3L (1.35V) VDDQ?

Yes - the MP20073DH-LF-Z supports VDDQ input from 1.3V to 6.0V, fully covering DDR3L's 1.35V nominal rail. Its 1.3V minimum input enables direct connection without intermediate regulation, reducing power loss and component count in low-voltage DDR memory systems.

How does Kelvin sensing improve VTT regulation accuracy?

Kelvin sensing uses dedicated VTTSEN and GND pins to measure VTT voltage directly at the DDR memory termination point, eliminating errors caused by PCB trace resistance between the regulator output and load. This ensures ±30mV accuracy at full 2A load, meeting JEDEC DDR2/DDR3 VTT tolerance specifications.

What is the purpose of the VDRV pin, and what voltage must it receive?

VDRV supplies power to the MP20073DH-LF-Z's internal control logic and must be set to 3.3V (3.0V–5.0V range). It operates independently of VDDQ, allowing reliable enable sequencing even during VDDQ ramp-up/down. A 1–4.7µF ceramic capacitor placed close to VDRV ensures stable bias under dynamic load conditions.

Does the MP20073DH-LF-Z support both DDR2 and DDR3 VREF voltages?

Yes - the MP20073DH-LF-Z accepts VREF inputs of 1.5V (DDR2) or 1.8V (DDR3) on the REF pin and internally generates VTTREF = VREF/2 with ±15mV to ±18mV accuracy. This dual-voltage compatibility enables single-design reuse across DDR2 and DDR3 memory interfaces.

What thermal design practices are required for continuous 2A operation?

For continuous 2A operation, the MSOP8E exposed pad must be soldered to a solid PCB ground plane using ≥10 thermal vias (0.3mm drill). Use 1 oz or 2 oz copper layers, and ensure the thermal pad occupies ≥80% of the package footprint. With proper layout, θJA remains ≤80°C/W, limiting junction temperature rise to <120°C at TA = 85°C.

Is the MP20073DH-LF-Z RoHS compliant and lead-free?

Yes - the "-LF" suffix in MP20073DH-LF-Z indicates RoHS-compliant, lead-free packaging per EU Directive 2011/65/EU. All MPS products meet RoHS requirements, and green status documentation is available on the Monolithic Power Systems website under Products > Quality Assurance.