NXP Semiconductors MC34710EWR2

Overview

MC34710EWR2 from Freescale Semiconductor is a dual-output power management IC integrating a 5.0/3.3V buck switching regulator (700mA), a mode-selectable LDO linear regulator (3.3/2.5/1.8/1.5V, 500mA), supervisory circuitry with power-on reset and error reset, and power supply sequencing logic. It operates from 13–32V input and targets embedded MCU systems requiring coordinated I/O and core rail startup in industrial and commercial applications.

For engineers reviewing the MC34710EWR2 datasheet, MC34710EWR2 pinout, MC34710EWR2 application, or MC34710EWR2 equivalent, key selection criteria include its sequenced dual-rail output architecture, 200kHz hysteretic buck topology, thermal shutdown at 170°C, open-drain RST with programmable delay via CT capacitor, and Pb-free 32-pin SOICW-EP package with exposed thermal pad.

Technical Context

The MC34710EWR2 implements a fixed-frequency (~200kHz) hysteretic buck converter for VI/O regulation and a low-noise LDO for VCORE, both controlled by three digital MODE pins that jointly select output voltages per Table 5. Its internal charge pump (VB pin) generates gate drive above B+ for the high-side FET, eliminating external bootstrap components.

Supervision includes independent rising/falling thresholds for VI/O, VCORE, and B+, plus thermal shutdown with 20°C hysteresis. Power sequencing enforces VCORE − VI/O ≤ 0.9V during startup/shutdown, preventing core under-voltage relative to I/O - a critical requirement for many microcontrollers.

Key Specifications

Pinout & Package

MC34710EWR2 uses a 32-pin SOICW-EP (exposed pad) package with Pb-free EW suffix. The exposed thermal pad must be soldered to a large copper ground plane via an array of vias for effective heat dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NCP3218MNTXG and TPS65261RHBR, the MC34710EWR2 uniquely integrates buck + LDO + supervisor + sequencer + charge pump in one SOICW-EP package - reducing component count and layout complexity for industrial 13–32V systems where reliability and deterministic sequencing outweigh ultra-high efficiency or ultra-small size.

Availability

MC34710EWR2 is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control units, medical diagnostic equipment, and point-of-sale terminals requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MC34710EWR2 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

Freescale Semiconductor (now part of NXP Semiconductors) is a global leader in embedded processing and analog power solutions, specializing in automotive, industrial, and networking semiconductors.

The MC34710EWR2 belongs to Freescale's analog power management product line, designed specifically for ruggedized embedded systems requiring coordinated multi-rail power delivery, robust supervision, and simplified thermal design in 13–32V industrial environments.

FAQ

What are the valid voltage combinations for VI/O and VCORE on the MC34710EWR2?

The MC34710EWR2 supports eight VI/O–VCORE combinations via MODE0–MODE2 pin states. Valid pairs include 5.0V/3.3V (all MODE pins low), 3.3V/2.5V (MODE0 open, MODE1/MODE2 low), 5.0V/1.8V (MODE0/MODE2 low, MODE1 open), and 3.3V/1.5V (all MODE pins open). Each combination is explicitly defined in Table 5 of the datasheet, and no other voltages are supported.

How does the MC34710EWR2 enforce power sequencing between VI/O and VCORE rails?

The MC34710EWR2 enforces sequencing by clamping VCORE − VI/O to ≤0.9V during startup and shutdown. If VCORE exceeds VI/O by more than 0.9V, the VCORE regulator is suppressed until VI/O rises sufficiently. This hardware-level constraint ensures safe power-up order for MCUs that require I/O voltage to stabilize before core logic initializes - no external circuitry is needed.

What is the purpose of the VB, CP1, and CP2 pins on the MC34710EWR2?

The VB, CP1, and CP2 pins form the internal charge pump network that generates a gate drive voltage higher than B+ for the buck regulator's high-side FET. CP1 and CP2 connect to a 100nF ceramic flying capacitor, while VB connects to a bulk reservoir capacitor between VB and B+. This eliminates external bootstrap components and enables efficient 13–32V operation without auxiliary supplies.

Can the MC34710EWR2 operate with a 12V input supply?

No - the MC34710EWR2 has a minimum operating input voltage of 13V per its Absolute Maximum Ratings table. At 12V, the internal oscillator and charge pump may not start reliably, and the RST pin will assert due to VB+ < 13V. For 12V systems, a pre-regulator stage or alternative IC with lower VIN(min) is required.

What thermal design considerations apply to the MC34710EWR2's SOICW-EP package?

The MC34710EWR2's 32-pin SOICW-EP package requires soldering the exposed thermal pad to a large internal or bottom-layer copper ground plane using a grid of ≥6 thermal vias. With 2.0 in² copper heatsink, RθJA is 25°C/W; without additional heatsinking, it rises to 45°C/W. Junction temperature must remain ≤105°C for continuous 500mA VCORE operation - thermal simulation or IR measurement is recommended for high-power layouts.