NXP Semiconductors MC34710EW

Overview

MC34710EW 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, and power 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 MC34710EW datasheet, MC34710EW pinout, MC34710EW application, or MC34710EW equivalent, key selection considerations include its sequenced dual-rail output architecture, 200kHz hysteretic buck topology, thermal shutdown at 170°C, Pb-free SOICW-EP package, and explicit VCORE–VI/O voltage relationship enforcement during power transitions.

Technical Context

The MC34710EW implements a hysteretic buck converter with internal ~200kHz oscillator driving a high-side FET via charge-pump boosted gate drive (VB pin). Its VCORE LDO requires LINB+ ≥ VCORE(NOM) + 0.8V and enforces VCORE – VI/O ≤ 0.9V during sequencing to prevent core undervoltage relative to I/O.

Supervision uses independent rising/falling thresholds on VI/O, VCORE, VB+, and junction temperature, with open-drain RST output featuring programmable delay (via CT capacitor) and 2–8μs filter time. Mode pins (MODE0–MODE2) configure both outputs simultaneously using floating/ground logic per Table 5.

Key Specifications

Pinout & Package

MC34710EW is housed in a 32-lead SOICW-EP (exposed pad) package with Pb-free EW suffix. The exposed thermal pad must be connected to a large PCB ground plane via multiple 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 MC34710EW uniquely delivers wide-input dual-rail regulation with built-in sequencing, supervision, and thermal protection in a single SOICW-EP package - eliminating external coordination logic required by alternatives.

Availability

MC34710EW is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control units, commercial HVAC controllers, and embedded gateways requiring stable component supply across extended temperature and input voltage ranges.

Supply support for MC34710EW 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) specialized in high-reliability analog and mixed-signal ICs for automotive, industrial, and communications markets.

The MC34710EW belongs to Freescale's analog power management product line, designed specifically for embedded systems needing coordinated dual-rail power with wide-input operation and robust fault handling.

FAQ

What input voltage range does the MC34710EW support?

The MC34710EW supports an input voltage range of 13 V to 32 V, making it suitable for 24 V industrial DC systems and automotive applications subject to load dump. Absolute maximum rating is 36 V, but continuous operation above 32 V risks damage. Operation below 13 V disables regulation and triggers RST assertion due to insufficient VB+ for charge pump and oscillator operation.

How are the VI/O and VCORE output voltages configured on the MC34710EW?

The MC34710EW uses three mode pins (MODE0, MODE1, MODE2) to configure both VI/O and VCORE outputs simultaneously. Grounding or floating each pin selects combinations per Table 5 - e.g., MODE0=0/MODE1=0/MODE2=0 sets VI/O=5.0 V and VCORE=3.3 V, while all three floating yields VI/O=3.3 V and VCORE=1.5 V. No external resistors are needed.

What is the purpose of the VB, CP1, and CP2 pins on the MC34710EW?

VB, CP1, and CP2 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 flying capacitor, while VB connects to the reservoir capacitor between VB and B+. This eliminates external bootstrap components but requires careful capacitor selection (low-ESR ceramic) and layout to sustain 700 mA VI/O output.

Does the MC34710EW provide power sequencing between VI/O and VCORE rails?

Yes, the MC34710EW enforces strict power sequencing: VCORE is prevented from exceeding VI/O by more than 0.9 V during startup and shutdown. If VCORE rises too far above VI/O, the VCORE regulator is suppressed to clamp the differential. This ensures I/O peripherals are powered before or concurrently with the MCU core, preventing bus contention or latch-up.

What thermal management provisions does the MC34710EW require?

The MC34710EW uses a 32-pin SOICW-EP package with an exposed thermal pad. To maintain junction temperature ≤105 °C at full load, the pad must be soldered to a large PCB ground plane using a grid of thermal vias connected to inner-layer copper pours. With 2 in² of copper heatsink, RθJA is 45 °C/W; omitting this reduces thermal performance significantly and risks triggering 170 °C thermal shutdown.