Monolithic Power Systems Inc. MP8719GQ-P

Overview

MP8719GQ-P from Monolithic Power Systems is a 26V, 12A synchronous buck converter with integrated ±1A VTT LDO and buffered 1% accurate VTTREF output, designed specifically for DDR3/DDR3L/LPDDR3/DDR4 memory power delivery. It delivers high power density in a QFN-16 (3mm×3mm) package, features adaptive constant-on-time control, DC auto-tune loop, and operates from 4.5V to 26V input with 135μA quiescent current.

For engineers reviewing the MP8719GQ-P datasheet, MP8719GQ-P pinout, MP8719GQ-P application, or MP8719GQ-P equivalent, key selection considerations include its dual-regulator architecture (VDDQ + VTT + VTTREF), valley-current OCL protection, ultrasonic mode enablement, and compatibility with ceramic-only output capacitors without external ramp compensation.

Technical Context

The MP8719GQ-P integrates three tightly coupled power rails: a 12A synchronous buck (VDDQ) with adaptive COT control and DC auto-tune for load/line regulation; a ±1A sink/source VTT LDO with ≤25mV tracking error to VTTREF; and a buffered VTTREF output tracking VDDQ/2 within ±1% across 1V–1.5V VDDQ range. All regulators share coordinated soft-start and soft-shutdown sequencing.

Its protection architecture includes non-latching valley-current OCL (12–14A), 130% OVP with absolute 3.6V clamp, dual-threshold UVP (75% and 50% VREF), OTW at 130°C with 25°C hysteresis, and thermal shutdown at 145°C. EN1/EN2 logic enables independent VTT disable while retaining VDDQ/VTTREF operation.

Key Specifications

Pinout & Package

MP8719GQ-P is housed in a thermally enhanced QFN-16 (3mm × 3mm, 0.5mm pitch) package with exposed thermal pad. Pin 1 is marked by a dot; top marking is "AZF" followed by year and lot code.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar DDR memory power delivery applications.

Compared with RTQ2132B-QT and TPS51216RUKT, MP8719GQ-P uniquely integrates all three DDR rails (VDDQ/VTT/VTTREF) with ±1% VTTREF accuracy, ultrasonic mode, and 135μA S3 quiescent current - making it optimal for space-constrained, low-noise, high-accuracy DDR4/LPDDR3 systems.

Availability

MP8719GQ-P is available at Aetrix Electronics and suitable for DDR4 memory subsystems, network router power, and smart TV LPDDR3 applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP8719GQ-P 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 20 years of leadership in DC/DC conversion and power management solutions.

The MP8719 belongs to MPS's DDR memory power product line, engineered specifically to consolidate VDDQ, VTT, and VTTREF into a single QFN package for JEDEC-compliant DDR3/DDR4/LPDDR3 systems with minimal external components.

FAQ

What is the minimum output capacitance required for stable VTT operation?

The MP8719GQ-P requires a minimum 22µF X7R or X5R ceramic capacitor placed adjacent to the VTT pin. This value ensures adequate phase margin and transient response for ±1A sink/source loads typical in DDR termination. Larger values improve ripple suppression but are not required for stability.

Can MP8719GQ-P operate without an external ramp circuit?

Yes - MP8719GQ-P includes internal ramp compensation optimized for ceramic output capacitors. It achieves stable operation with pure ceramic solutions down to 10µF on VDDQ and 22µF on VTT, eliminating the need for external ramp networks or ESR-dependent POSCAPs.

How does the EN1/EN2 logic sequence affect DDR bus behavior during power-down?

When EN1 is pulled low while EN2 remains high, VTT enters Hi-Z state while VDDQ and VTTREF remain active - allowing controlled discharge of DDR lines through external termination resistors. This prevents bus contention and meets JEDEC-defined tDIS time requirements for clean DDR shutdown.

What is the purpose of the VTTS pin, and how should it be routed?

VTTS is the remote sense input for the VTT LDO, enabling Kelvin sensing at the DDR module. It must be routed as a dedicated, low-current trace separate from the high-current VTT power path, connecting directly to the positive terminal of the remote VTT output capacitor to eliminate IR drop errors.

Does MP8719GQ-P support pre-biased output startup?

Yes - MP8719GQ-P detects pre-biased VDDQ at startup and disables both HS-FET and LS-FET until the internal reference voltage exceeds the sensed FB voltage. This prevents reverse current flow and ensures monotonic rise of VDDQ even when powered into an already-biased rail.

What is the maximum allowable thermal resistance (θJA) for continuous 12A operation at 60°C ambient?

With TJ(MAX) = 125°C and PD(MAX) = (125°C − 60°C)/θJA, the device's 2.3W max power dissipation at TA = 25°C implies θJA ≤ 55°C/W per datasheet. At 60°C ambient, continuous 12A operation requires θJA ≤ 28°C/W - achievable with 2oz copper, 4-layer PCB, and thermal vias under the exposed pad.

Is the VTTREF output capable of driving external circuitry beyond DDR reference?

VTTREF is specified for 10mA sink/source and ±1% accuracy tracking VDDQ/2. While usable as a general-purpose low-noise reference, its load regulation degrades beyond 10mA, and its primary design intent is DDR bus termination - not general analog reference applications.