NXP Semiconductors MC34713EPR2

Overview

MC34713EPR2 from NXP Semiconductors (formerly Freescale) is a fully integrated 5.0 A synchronous buck DC-DC regulator with integrated 50 mΩ N-channel MOSFETs, voltage tracking capability, and 1.0 MHz default switching frequency. It delivers ±1% output voltage accuracy from 0.7 V to 3.6 V across 3.0–6.0 V input, enabling precise point-of-load power for FPGA core rails.

For engineers reviewing the MC34713EPR2 datasheet, MC34713EPR2 pinout, MC34713EPR2 application, or MC34713EPR2 equivalent, key selection criteria include its thermal shutdown threshold (170°C), programmable soft start (0.4–3.2 ms), over-current limit (6.5 A), and 24-pin exposed-pad QFN package optimized for high-current PoL efficiency and sequencing.

Technical Context

The MC34713EPR2 implements a voltage-mode synchronous buck topology with monolithic integration of high-side and low-side power MOSFETs, eliminating external gate drivers and reducing layout complexity. Its internal bias regulator supplies stable 2.5 V (±0.15 V) to analog/digital circuitry, while the error amplifier features 150 dB DC gain and 3.0 MHz unity-gain bandwidth for tight transient response.

Tracking functionality is implemented via the VREFIN pin, allowing the output to follow an external reference in multiple configurations-enabling coordinated power-up/down sequencing with companion regulators. Protection logic includes cycle-by-cycle over-current limiting, 10 ms fault timer, and 100 ms retry timeout after short-circuit or thermal shutdown events.

Key Specifications

Pinout & Package

Housed in a thermally enhanced, Pb-free 24-pin QFN with exposed thermal pad (EP suffix), the MC34713EPR2 uses a 4×4 mm body with 0.5 mm pitch. The exposed pad must be soldered to a dedicated GND plane for optimal thermal performance (R_θJB = 22°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2315DJ-LF-Z and TPS54560BQDDARQ1, the MC34713EPR2 uniquely combines 5 A capability, VREFIN tracking, integrated discharge FET, and 24-pin QFN in a 3–6 V input range - making it the only option that satisfies FPGA core sequencing, space-constrained layouts, and rapid shutdown discharge in a single device.

Availability

MC34713EPR2 is available at Aetrix Electronics and suitable for FPGA core power, ASIC point-of-load supply, DSP processor rail, and multi-rail sequencing systems requiring stable component supply and long-term production continuity.

Supply support for MC34713EPR2 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 IoT applications, with deep expertise in power management and mixed-signal IC design.

The MC34713EPR2 belongs to NXP's SMARTMOS high-integration power regulator family, engineered specifically for space-constrained, high-current point-of-load applications in computing and communications infrastructure where reliability, thermal performance, and sequencing control are critical.

FAQ

What is the maximum continuous output current supported by the MC34713EPR2?

The MC34713EPR2 supports 5.0 A continuous output current under thermal limits (T_J ≤ 150°C). This rating assumes proper PCB layout with the exposed thermal pad soldered to a 4-layer board with thermal vias, achieving R_θJMA = 43°C/W. At ambient 85°C, derating applies per the 2.9 W maximum power dissipation specification.

How does the MC34713EPR2 implement voltage tracking, and what is the valid input range for VREFIN?

The MC34713EPR2 implements voltage tracking via the VREFIN pin, which serves as the error amplifier reference during startup until the output reaches 0.7 V, then defaults to the internal 0.7 V bandgap. VREFIN accepts 0–1.35 V, enabling direct tracking of DDR VTT, I/O rails, or other low-voltage references. Tracking configuration is set by external feedback resistor ratios and requires no firmware or configuration registers.

What protection features are built into the MC34713EPR2, and how do they respond to faults?

The MC34713EPR2 integrates over-current limit (6.5 A), short-circuit cutoff (8.5 A), output over-voltage (±1.5–8% thresholds), under-voltage detection, and thermal shutdown (170°C). On over-current, it enters cycle-by-cycle limiting for 10 ms; if unresolved, it disables output and retries after 100 ms. Short-circuit triggers immediate shutdown and 100 ms retry. Thermal shutdown holds off output until die cools by 25°C hysteresis.

Can the MC34713EPR2 operate without an external compensation network, and what type is recommended?

No, the MC34713EPR2 requires an external Type III compensation network connected to the COMP pin for loop stability. This network typically includes two capacitors and two resistors configured to provide sufficient phase margin across line, load, and temperature variations. Omitting or misconfiguring this network causes oscillation or poor transient response - the datasheet provides design equations and example values for common output capacitor types.

What is the purpose of the VOUT pin on the MC34713EPR2, and how does it differ from the main output connection?

The VOUT pin on the MC34713EPR2 is not the main power output - it is the drain terminal of the internal discharge FET. During normal operation, it is inactive. When the SD pin is asserted (low), this FET turns on to rapidly discharge the output capacitor, preventing hold-up voltage and enabling precise power-down sequencing. The main regulated output is delivered from the SW node through the inductor to the output capacitor bank.