Monolithic Power Systems Inc. EV20075DH-00A

Overview

EV20075DH-00A from Monolithic Power Systems is a 3A sink/source DDR memory VTT termination regulator with integrated VTTREF buffer, designed for DDR2/DDR3 memory subsystems requiring precise ½×VDDQ tracking. It operates from 1.30V–3.6V VDDQ input, delivers ±3A output current, maintains ±30mV VTT/VTTREF accuracy, and supports Kelvin sensing via VTTSEN pin for high-speed memory bus termination.

For engineers reviewing the EV20075DH-00A datasheet, EV20075DH-00A pinout, EV20075DH-00A application in DDR termination, or EV20075DH-00A equivalent for VTT regulation, this evaluation board implements the MP20075DH IC in an 8-pin MSOP-EP package with verified 20μF ceramic output capacitance requirement, thermal shutdown, and ACPI-compliant active termination support.

Technical Context

The EV20075DH-00A implements a linear LDO architecture with dual-output tracking: VTT (±3A sink/source) and VTTREF (buffered ½×VREF), both referenced to VDDQ. It uses internal resistor divider feedback and Kelvin sensing (VTTSEN) to reject PCB trace resistance errors in high-current DDR termination paths.

VDRV = 3.3V supplies gate drive for internal pass devices, while VDDQ (1.3V–3.6V) sets the reference voltage. Soft-start, UVLO, overcurrent limiting, and thermal shutdown are embedded-no external components required for protection functions.

Key Specifications

Availability

EV20075DH-00A is available at Aetrix Electronics and suitable for DDR2/DDR3 memory termination, ACPI-compliant notebook power systems, and active termination bus designs requiring stable component supply and rapid design validation.

Supply support for EV20075DH-00A 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 precision power management.

The MP20075 product line targets DDR memory interface power delivery, delivering integrated VTT/VTTREF regulation with minimal external components for space-constrained, cost-sensitive computing platforms.

FAQ

What is the function of the VTTSEN pin on the EV20075DH-00A?

The VTTSEN pin enables Kelvin sensing for the VTT output, allowing remote feedback from the DDR memory bus to compensate for PCB trace resistance voltage drop. This ensures accurate ½×VDDQ regulation at the load point, critical for DDR signal integrity under ±3A transient currents.

Can EV20075DH-00A support DDR4 VDDQ voltages?

No. The EV20075DH-00A is specified for VDDQ input range of 1.30V–3.6V, matching DDR2 (1.8V), DDR3 (1.5V), and LPDDR2/LPDDR3 (1.2V–1.8V). DDR4 requires 1.2V nominal VDDQ with tighter tolerance, outside this device's validated operating range.

How is VTTREF generated and what is its accuracy?

VTTREF is a buffered, low-impedance copy of ½×VREF, where VREF equals VDDQ. It achieves ±30mV accuracy across temperature and load, enabling precise reference for DDR memory controller VTTREF inputs without external resistive dividers.

What is the role of the VDRV pin and why is it fixed at 3.3V?

VDRV supplies 3.3V to the internal gate driver circuitry, ensuring robust turn-on of the pass devices regardless of VDDQ level. This separation isolates regulation stability from VDDQ rail noise and enables fast transient response even at low VDDQ (e.g., 1.3V).

Does the EV20075DH-00A require external compensation components?

No. The EV20075DH-00A is internally compensated and designed to operate stably with only 20μF total ceramic output capacitance (2×10μF). No external compensation network, ESR requirements, or phase-margin tuning is needed.

Is thermal shutdown latched or auto-recovering?

Thermal shutdown is auto-recovering: the device disables output when junction temperature exceeds safe limit (~150°C), then automatically resumes operation once temperature falls below hysteresis threshold (~135°C), supporting continuous thermal management in compact layouts.