NXP Semiconductors MC34716EP

Overview

MC34716EP from NXP Semiconductors is a dual synchronous buck switching regulator IC designed specifically for DDR memory power delivery. It integrates two high-efficiency channels: Channel 1 delivers up to 5.0 A sourcing capability for VDDQ, while Channel 2 sinks and sources ±3.0 A to support VTT tracking. It features ±1% output voltage accuracy (0.6–3.6 V), 1.0 MHz default switching frequency, and a buffered VREFOUT output for DDR reference voltage distribution.

For engineers reviewing the MC34716EP datasheet, MC34716EP pinout, MC34716EP application, or MC34716EP equivalent, this device serves as a complete PoL solution for DDR2/DDR3/LPDDR3/LPDDR4 termination and sequencing - with verified tracking behavior, integrated MOSFETs (50 mΩ R_DS(on)), thermal shutdown, overcurrent protection, and active-low PG/STBY/SD control signals critical for S3/S5 power states.

Technical Context

The MC34716EP implements two independent voltage-mode synchronous buck converters sharing a common oscillator and system control logic. Channel 1 operates in source-only mode with programmable soft-start via ILIM1, while Channel 2 supports bidirectional current flow and tracks ½ × VREFIN using an internal precision resistor divider. Both channels use integrated N-channel MOSFETs and feature external compensation (COMP1/COMP2) with type III networks.

Its internal architecture includes dedicated discharge MOSFETs (M8/M9/M10) for controlled VDDQ/VTT/VREF ramp-down during shutdown, thermal monitoring with 170°C trip point and 25°C hysteresis, and independent overvoltage/undervoltage filtering (5–25 µs delay). The VREFOUT buffer provides 8 mA drive with ±1% accuracy ≥0.6 V, eliminating need for external divider in DDR systems.

Key Specifications

Pinout & Package

Housed in a thermally enhanced 26-pin QFN package with exposed thermal pad (EP suffix), the MC34716EP uses a Pb-free, space-efficient footprint optimized for DDR memory power delivery near memory modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-output DDR power supply applications.

Compared with TPS51200DRCR and ISL95812IRZ, the MC34716EP uniquely integrates VDDQ regulation, VTT tracking, and buffered VREFOUT in one package - reducing component count by 3–5 devices and enabling single-chip DDR power sequencing with guaranteed <±40 mV VTT–VREF tracking error.

Availability

MC34716EP is available at Aetrix Electronics and suitable for DDR memory subsystems, server DIMM modules, and high-performance embedded graphics requiring stable component supply, long-term lifecycle support, and automotive-grade reliability validation.

Supply support for MC34716EP 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

NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and consumer applications - with deep expertise in power management ICs for memory and high-speed interfaces.

The MC34716EP belongs to NXP's SMARTMOS DDR power supply family, engineered specifically to replace multi-IC DDR power trees with a single, highly integrated, JEDEC-compliant solution for DDR2 through LPDDR4 memory systems.

FAQ

What is the primary function of the MC34716EP in DDR memory systems?

The MC34716EP serves as a complete point-of-load power solution for DDR memory, simultaneously generating VDDQ (via Channel 1), VTT (via Channel 2 tracking ½×VREFIN), and a buffered VREFOUT rail. Its integrated architecture eliminates the need for separate regulators and external tracking networks, ensuring JEDEC-compliant voltage relationships and sequencing across DDR2, DDR3, LPDDR3, and LPDDR4 standards.

Does the MC34716EP support both DDR3 and DDR4 memory voltage requirements?

Yes, the MC34716EP supports DDR3 and LPDDR3/LPDDR4 voltage ranges: Channel 1 delivers VDDQ from 0.7 V to 3.6 V (e.g., 1.5 V for DDR3, 1.2 V for DDR4), while Channel 2 provides VTT from 0.6 V to 1.35 V (e.g., 0.75 V for DDR3, 0.6 V for DDR4). Its ±1% output accuracy and internal ½×VREFIN tracking meet JEDEC specifications for both generations.

How does the MC34716EP handle power sequencing during system shutdown?

The MC34716EP uses internal discharge MOSFETs (M8, M9, M10) activated during shutdown mode (SD = low) to actively pull down VDDQ, VTT, and VREFOUT. This ensures controlled, simultaneous ramp-down that complies with DDR timing requirements - preventing data corruption and eliminating need for external bleed resistors or sequencing controllers.

Can the MC34716EP operate without external compensation components?

No, the MC34716EP requires external type III compensation networks connected to COMP1 and COMP2 pins for stable loop control. Each channel's compensation must be individually tuned based on output capacitance, inductance, and load conditions - reference design guidelines in NXP AN11177 provide recommended RC values for common DDR configurations.

What thermal performance can be expected from the MC34716EP in a typical 4-layer PCB layout?

In a standard 4-layer PCB with thermal vias under the exposed pad, the MC34716EP achieves θ_JMA = 32°C/W. At 85°C ambient and full 5 A/3 A load, junction temperature remains below 150°C - well within safe operating limits. Layout best practices (e.g., ≥6 thermal vias, 1 oz copper pour under EP pad) are essential to maintain this performance.