NXP Semiconductors MC34704AEPR2

Overview

MC34704AEPR2 from NXP Semiconductors (formerly Freescale) is an 8-channel DC-DC power management IC (PMIC) designed for multimedia application processors. It delivers eight independent regulated outputs (5–15 V, ±5–9 V, 0.6–3.6 V) from a single 2.7–5.5 V input, supports I²C programmability, dynamic voltage scaling, and operates up to 2.0 MHz switching frequency-enabling compact Li-ion–powered portable devices.

For engineers reviewing the MC34704AEPR2 datasheet, MC34704AEPR2 pinout, MC34704AEPR2 application, or MC34704AEPR2 equivalent, key selection criteria include regulator count (8), I²C address ($54), ±2% output accuracy, thermal/overcurrent/UVLO/OVLO protection per channel, and QFN56 7×7 mm Pb-free package compatibility with space-constrained mobile designs.

Technical Context

The MC34704AEPR2 integrates eight synchronous buck, boost, buck-boost, and inverting regulators-REG1–REG8-with independent feedback, compensation, and protection circuitry. Each regulator features programmable soft-start, dynamic voltage scaling via I²C, and dedicated overcurrent, undervoltage, overvoltage, and thermal monitoring.

Its SMARTMOS process enables true cutoff on boost/buck-boost channels, integrated compensation for REG1/REG3/REG6/REG8, and 5.0 µA shutdown current. The device uses two selectable oscillator frequencies (fSW1: 750–2000 kHz; fSW2: 250–1000 kHz) controlled via external resistor dividers on FREQ and SS pins.

Key Specifications

Pinout & Package

The MC34704AEPR2 is housed in a Pb-free 56-pin QFN package (7 mm × 7 mm, 0.5 mm pitch) with an exposed thermal pad (PGND) for enhanced heat dissipation. Pin functions are defined per Table 2 of the datasheet Rev. 8.0, with distinct assignments for each regulator's switching nodes (SWx), bootstrap inputs (BTx), feedback (FBx), compensation (COMPx), and power inputs (PVINx).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multi-rail PMIC applications.

Compared with MC34704BEP/R2 and MP8859GQ-Z, the MC34704AEPR2 uniquely supports eight fully protected, independently programmable channels-including a dedicated inverting regulator (REG7) and high-voltage boost (REG6/REG8)-making it the only option for full-featured multimedia SoC power in space-constrained Li-ion devices.

Availability

MC34704AEPR2 is available at Aetrix Electronics and suitable for mobile application processor power, DDR memory supply, LCD bias generation, and negative rail generation requiring stable component supply across high-mix, low-volume production runs.

Supply support for MC34704AEPR2 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. Formerly Freescale Semiconductor, it acquired the MC34704 product line in 2015.

The MC34704 belongs to NXP's SMARTMOS-based power management IC family, engineered specifically for high-efficiency, multi-rail power delivery in battery-powered multimedia platforms - emphasizing integration, programmability, and robust fault handling.

FAQ

What is the maximum switching frequency supported by the MC34704AEPR2?

The MC34704AEPR2 supports a maximum switching frequency of 2.0 MHz on its primary oscillator (fSW1). This high-frequency capability allows designers to use smaller external inductors and ceramic capacitors, significantly reducing solution footprint and improving transient response. Frequency is set via an external resistor divider on the FREQ pin and is accurate to ±10% across temperature and supply variations. The MC34704AEPR2 also supports a secondary oscillator (fSW2) ranging from 250 kHz to 1.0 MHz for lower-noise or higher-efficiency operating points.

Does the MC34704AEPR2 support negative voltage output?

Yes, the MC34704AEPR2 supports negative voltage output via REG7, which is an inverting regulator capable of delivering −5.0 V to −9.0 V with ±2% accuracy. REG7 includes dedicated circuitry: DRV7 gate driver output, VREF7 reference (1.5 V ±0.07 V), and FB7 feedback input. It is available only on the "A" variant (MC34704AEPR2), not on the "B" variant. The negative rail is intended for analog front-ends, audio codecs, or sensor biasing in portable equipment.

How many independent power rails does the MC34704AEPR2 provide?

The MC34704AEPR2 provides eight independent, fully protected DC-DC power rails (REG1 through REG8), each configurable as buck, boost, buck-boost, or inverting. REG1–REG5 cover low-voltage core/I/O domains (0.6–3.6 V), REG6 and REG8 deliver high-voltage positive outputs (5–15 V) for LCD bias or backlight, and REG7 generates negative outputs (−5 to −9 V). All eight regulators feature individual feedback, compensation, and fault monitoring - confirmed in Table 1 and Figures 2–3 of the datasheet Rev. 8.0.

What protection features are implemented per channel in the MC34704AEPR2?

Each of the eight regulators in the MC34704AEPR2 implements independent protection: overcurrent limit detection (±20% accuracy), short-circuit protection, output undervoltage/overvoltage detection (±20% thresholds), and thermal limit detection (except REG7, which lacks thermal sensing per datasheet Section 4.3). Additionally, REG1–REG6 and REG8 include discharge MOSFETs (R_DS(on)-DIS ≤ 70 Ω) for rapid rail ramp-down. These protections are hardware-monitored and report faults via I²C registers and the open-drain RST pin.

Is the MC34704AEPR2 pin-compatible with the MC34704BEP/R2?

The MC34704AEPR2 and MC34704BEP/R2 share the same 56-pin QFN package and mechanical footprint, but they are not functionally pin-compatible. Pins 23 (VOUT1), 28 (COMP7), 29 (VREF7), 30 (FB7), 31 (DRV7), 32 (VOUT7), 33 (FB6), 34 (BT6), 35 (SW6), and 36 (VOUT6) are No Connect (NC) on the "B" variant, while active on the "A" variant. Therefore, PCBs designed for MC34704AEPR2 cannot operate MC34704BEP/R2 without redesign - and vice versa - due to missing regulator connections and unused pins tied to GND or left floating per datasheet Table 1 and Pin Definitions.